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This is /home/vagrant/rpmbuild/BUILD/build-eglibc/manual/libc.info,
produced by makeinfo version 4.13 from libc.texinfo.
INFO-DIR-SECTION Software libraries
START-INFO-DIR-ENTRY
* Libc: (libc). C library.
END-INFO-DIR-ENTRY
INFO-DIR-SECTION GNU C library functions and macros
START-INFO-DIR-ENTRY
* ALTWERASE: (libc)Local Modes.
* ARGP_ERR_UNKNOWN: (libc)Argp Parser Functions.
* ARG_MAX: (libc)General Limits.
* BC_BASE_MAX: (libc)Utility Limits.
* BC_DIM_MAX: (libc)Utility Limits.
* BC_SCALE_MAX: (libc)Utility Limits.
* BC_STRING_MAX: (libc)Utility Limits.
* BRKINT: (libc)Input Modes.
* BUFSIZ: (libc)Controlling Buffering.
* CCTS_OFLOW: (libc)Control Modes.
* CHILD_MAX: (libc)General Limits.
* CIGNORE: (libc)Control Modes.
* CLK_TCK: (libc)Processor Time.
* CLOCAL: (libc)Control Modes.
* CLOCKS_PER_SEC: (libc)CPU Time.
* COLL_WEIGHTS_MAX: (libc)Utility Limits.
* CPU_CLR: (libc)CPU Affinity.
* CPU_ISSET: (libc)CPU Affinity.
* CPU_SET: (libc)CPU Affinity.
* CPU_SETSIZE: (libc)CPU Affinity.
* CPU_ZERO: (libc)CPU Affinity.
* CREAD: (libc)Control Modes.
* CRTS_IFLOW: (libc)Control Modes.
* CS5: (libc)Control Modes.
* CS6: (libc)Control Modes.
* CS7: (libc)Control Modes.
* CS8: (libc)Control Modes.
* CSIZE: (libc)Control Modes.
* CSTOPB: (libc)Control Modes.
* DES_FAILED: (libc)DES Encryption.
* DTTOIF: (libc)Directory Entries.
* E2BIG: (libc)Error Codes.
* EACCES: (libc)Error Codes.
* EADDRINUSE: (libc)Error Codes.
* EADDRNOTAVAIL: (libc)Error Codes.
* EADV: (libc)Error Codes.
* EAFNOSUPPORT: (libc)Error Codes.
* EAGAIN: (libc)Error Codes.
* EALREADY: (libc)Error Codes.
* EAUTH: (libc)Error Codes.
* EBACKGROUND: (libc)Error Codes.
* EBADE: (libc)Error Codes.
* EBADF: (libc)Error Codes.
* EBADFD: (libc)Error Codes.
* EBADMSG: (libc)Error Codes.
* EBADR: (libc)Error Codes.
* EBADRPC: (libc)Error Codes.
* EBADRQC: (libc)Error Codes.
* EBADSLT: (libc)Error Codes.
* EBFONT: (libc)Error Codes.
* EBUSY: (libc)Error Codes.
* ECANCELED: (libc)Error Codes.
* ECHILD: (libc)Error Codes.
* ECHO: (libc)Local Modes.
* ECHOCTL: (libc)Local Modes.
* ECHOE: (libc)Local Modes.
* ECHOK: (libc)Local Modes.
* ECHOKE: (libc)Local Modes.
* ECHONL: (libc)Local Modes.
* ECHOPRT: (libc)Local Modes.
* ECHRNG: (libc)Error Codes.
* ECOMM: (libc)Error Codes.
* ECONNABORTED: (libc)Error Codes.
* ECONNREFUSED: (libc)Error Codes.
* ECONNRESET: (libc)Error Codes.
* ED: (libc)Error Codes.
* EDEADLK: (libc)Error Codes.
* EDEADLOCK: (libc)Error Codes.
* EDESTADDRREQ: (libc)Error Codes.
* EDIED: (libc)Error Codes.
* EDOM: (libc)Error Codes.
* EDOTDOT: (libc)Error Codes.
* EDQUOT: (libc)Error Codes.
* EEXIST: (libc)Error Codes.
* EFAULT: (libc)Error Codes.
* EFBIG: (libc)Error Codes.
* EFTYPE: (libc)Error Codes.
* EGRATUITOUS: (libc)Error Codes.
* EGREGIOUS: (libc)Error Codes.
* EHOSTDOWN: (libc)Error Codes.
* EHOSTUNREACH: (libc)Error Codes.
* EHWPOISON: (libc)Error Codes.
* EIDRM: (libc)Error Codes.
* EIEIO: (libc)Error Codes.
* EILSEQ: (libc)Error Codes.
* EINPROGRESS: (libc)Error Codes.
* EINTR: (libc)Error Codes.
* EINVAL: (libc)Error Codes.
* EIO: (libc)Error Codes.
* EISCONN: (libc)Error Codes.
* EISDIR: (libc)Error Codes.
* EISNAM: (libc)Error Codes.
* EKEYEXPIRED: (libc)Error Codes.
* EKEYREJECTED: (libc)Error Codes.
* EKEYREVOKED: (libc)Error Codes.
* EL2HLT: (libc)Error Codes.
* EL2NSYNC: (libc)Error Codes.
* EL3HLT: (libc)Error Codes.
* EL3RST: (libc)Error Codes.
* ELIBACC: (libc)Error Codes.
* ELIBBAD: (libc)Error Codes.
* ELIBEXEC: (libc)Error Codes.
* ELIBMAX: (libc)Error Codes.
* ELIBSCN: (libc)Error Codes.
* ELNRNG: (libc)Error Codes.
* ELOOP: (libc)Error Codes.
* EMEDIUMTYPE: (libc)Error Codes.
* EMFILE: (libc)Error Codes.
* EMLINK: (libc)Error Codes.
* EMSGSIZE: (libc)Error Codes.
* EMULTIHOP: (libc)Error Codes.
* ENAMETOOLONG: (libc)Error Codes.
* ENAVAIL: (libc)Error Codes.
* ENEEDAUTH: (libc)Error Codes.
* ENETDOWN: (libc)Error Codes.
* ENETRESET: (libc)Error Codes.
* ENETUNREACH: (libc)Error Codes.
* ENFILE: (libc)Error Codes.
* ENOANO: (libc)Error Codes.
* ENOBUFS: (libc)Error Codes.
* ENOCSI: (libc)Error Codes.
* ENODATA: (libc)Error Codes.
* ENODEV: (libc)Error Codes.
* ENOENT: (libc)Error Codes.
* ENOEXEC: (libc)Error Codes.
* ENOKEY: (libc)Error Codes.
* ENOLCK: (libc)Error Codes.
* ENOLINK: (libc)Error Codes.
* ENOMEDIUM: (libc)Error Codes.
* ENOMEM: (libc)Error Codes.
* ENOMSG: (libc)Error Codes.
* ENONET: (libc)Error Codes.
* ENOPKG: (libc)Error Codes.
* ENOPROTOOPT: (libc)Error Codes.
* ENOSPC: (libc)Error Codes.
* ENOSR: (libc)Error Codes.
* ENOSTR: (libc)Error Codes.
* ENOSYS: (libc)Error Codes.
* ENOTBLK: (libc)Error Codes.
* ENOTCONN: (libc)Error Codes.
* ENOTDIR: (libc)Error Codes.
* ENOTEMPTY: (libc)Error Codes.
* ENOTNAM: (libc)Error Codes.
* ENOTRECOVERABLE: (libc)Error Codes.
* ENOTSOCK: (libc)Error Codes.
* ENOTSUP: (libc)Error Codes.
* ENOTTY: (libc)Error Codes.
* ENOTUNIQ: (libc)Error Codes.
* ENXIO: (libc)Error Codes.
* EOF: (libc)EOF and Errors.
* EOPNOTSUPP: (libc)Error Codes.
* EOVERFLOW: (libc)Error Codes.
* EOWNERDEAD: (libc)Error Codes.
* EPERM: (libc)Error Codes.
* EPFNOSUPPORT: (libc)Error Codes.
* EPIPE: (libc)Error Codes.
* EPROCLIM: (libc)Error Codes.
* EPROCUNAVAIL: (libc)Error Codes.
* EPROGMISMATCH: (libc)Error Codes.
* EPROGUNAVAIL: (libc)Error Codes.
* EPROTO: (libc)Error Codes.
* EPROTONOSUPPORT: (libc)Error Codes.
* EPROTOTYPE: (libc)Error Codes.
* EQUIV_CLASS_MAX: (libc)Utility Limits.
* ERANGE: (libc)Error Codes.
* EREMCHG: (libc)Error Codes.
* EREMOTE: (libc)Error Codes.
* EREMOTEIO: (libc)Error Codes.
* ERESTART: (libc)Error Codes.
* ERFKILL: (libc)Error Codes.
* EROFS: (libc)Error Codes.
* ERPCMISMATCH: (libc)Error Codes.
* ESHUTDOWN: (libc)Error Codes.
* ESOCKTNOSUPPORT: (libc)Error Codes.
* ESPIPE: (libc)Error Codes.
* ESRCH: (libc)Error Codes.
* ESRMNT: (libc)Error Codes.
* ESTALE: (libc)Error Codes.
* ESTRPIPE: (libc)Error Codes.
* ETIME: (libc)Error Codes.
* ETIMEDOUT: (libc)Error Codes.
* ETOOMANYREFS: (libc)Error Codes.
* ETXTBSY: (libc)Error Codes.
* EUCLEAN: (libc)Error Codes.
* EUNATCH: (libc)Error Codes.
* EUSERS: (libc)Error Codes.
* EWOULDBLOCK: (libc)Error Codes.
* EXDEV: (libc)Error Codes.
* EXFULL: (libc)Error Codes.
* EXIT_FAILURE: (libc)Exit Status.
* EXIT_SUCCESS: (libc)Exit Status.
* EXPR_NEST_MAX: (libc)Utility Limits.
* FD_CLOEXEC: (libc)Descriptor Flags.
* FD_CLR: (libc)Waiting for I/O.
* FD_ISSET: (libc)Waiting for I/O.
* FD_SET: (libc)Waiting for I/O.
* FD_SETSIZE: (libc)Waiting for I/O.
* FD_ZERO: (libc)Waiting for I/O.
* FILENAME_MAX: (libc)Limits for Files.
* FLUSHO: (libc)Local Modes.
* FOPEN_MAX: (libc)Opening Streams.
* FP_ILOGB0: (libc)Exponents and Logarithms.
* FP_ILOGBNAN: (libc)Exponents and Logarithms.
* F_DUPFD: (libc)Duplicating Descriptors.
* F_GETFD: (libc)Descriptor Flags.
* F_GETFL: (libc)Getting File Status Flags.
* F_GETLK: (libc)File Locks.
* F_GETOWN: (libc)Interrupt Input.
* F_OK: (libc)Testing File Access.
* F_SETFD: (libc)Descriptor Flags.
* F_SETFL: (libc)Getting File Status Flags.
* F_SETLK: (libc)File Locks.
* F_SETLKW: (libc)File Locks.
* F_SETOWN: (libc)Interrupt Input.
* HUGE_VAL: (libc)Math Error Reporting.
* HUGE_VALF: (libc)Math Error Reporting.
* HUGE_VALL: (libc)Math Error Reporting.
* HUPCL: (libc)Control Modes.
* I: (libc)Complex Numbers.
* ICANON: (libc)Local Modes.
* ICRNL: (libc)Input Modes.
* IEXTEN: (libc)Local Modes.
* IFNAMSIZ: (libc)Interface Naming.
* IFTODT: (libc)Directory Entries.
* IGNBRK: (libc)Input Modes.
* IGNCR: (libc)Input Modes.
* IGNPAR: (libc)Input Modes.
* IMAXBEL: (libc)Input Modes.
* INADDR_ANY: (libc)Host Address Data Type.
* INADDR_BROADCAST: (libc)Host Address Data Type.
* INADDR_LOOPBACK: (libc)Host Address Data Type.
* INADDR_NONE: (libc)Host Address Data Type.
* INFINITY: (libc)Infinity and NaN.
* INLCR: (libc)Input Modes.
* INPCK: (libc)Input Modes.
* IPPORT_RESERVED: (libc)Ports.
* IPPORT_USERRESERVED: (libc)Ports.
* ISIG: (libc)Local Modes.
* ISTRIP: (libc)Input Modes.
* IXANY: (libc)Input Modes.
* IXOFF: (libc)Input Modes.
* IXON: (libc)Input Modes.
* LINE_MAX: (libc)Utility Limits.
* LINK_MAX: (libc)Limits for Files.
* L_ctermid: (libc)Identifying the Terminal.
* L_cuserid: (libc)Who Logged In.
* L_tmpnam: (libc)Temporary Files.
* MAXNAMLEN: (libc)Limits for Files.
* MAXSYMLINKS: (libc)Symbolic Links.
* MAX_CANON: (libc)Limits for Files.
* MAX_INPUT: (libc)Limits for Files.
* MB_CUR_MAX: (libc)Selecting the Conversion.
* MB_LEN_MAX: (libc)Selecting the Conversion.
* MDMBUF: (libc)Control Modes.
* MSG_DONTROUTE: (libc)Socket Data Options.
* MSG_OOB: (libc)Socket Data Options.
* MSG_PEEK: (libc)Socket Data Options.
* NAME_MAX: (libc)Limits for Files.
* NAN: (libc)Infinity and NaN.
* NCCS: (libc)Mode Data Types.
* NGROUPS_MAX: (libc)General Limits.
* NOFLSH: (libc)Local Modes.
* NOKERNINFO: (libc)Local Modes.
* NSIG: (libc)Standard Signals.
* NULL: (libc)Null Pointer Constant.
* ONLCR: (libc)Output Modes.
* ONOEOT: (libc)Output Modes.
* OPEN_MAX: (libc)General Limits.
* OPOST: (libc)Output Modes.
* OXTABS: (libc)Output Modes.
* O_ACCMODE: (libc)Access Modes.
* O_APPEND: (libc)Operating Modes.
* O_ASYNC: (libc)Operating Modes.
* O_CREAT: (libc)Open-time Flags.
* O_EXCL: (libc)Open-time Flags.
* O_EXEC: (libc)Access Modes.
* O_EXLOCK: (libc)Open-time Flags.
* O_FSYNC: (libc)Operating Modes.
* O_IGNORE_CTTY: (libc)Open-time Flags.
* O_NDELAY: (libc)Operating Modes.
* O_NOATIME: (libc)Operating Modes.
* O_NOCTTY: (libc)Open-time Flags.
* O_NOLINK: (libc)Open-time Flags.
* O_NONBLOCK: (libc)Open-time Flags.
* O_NONBLOCK: (libc)Operating Modes.
* O_NOTRANS: (libc)Open-time Flags.
* O_RDONLY: (libc)Access Modes.
* O_RDWR: (libc)Access Modes.
* O_READ: (libc)Access Modes.
* O_SHLOCK: (libc)Open-time Flags.
* O_SYNC: (libc)Operating Modes.
* O_TRUNC: (libc)Open-time Flags.
* O_WRITE: (libc)Access Modes.
* O_WRONLY: (libc)Access Modes.
* PARENB: (libc)Control Modes.
* PARMRK: (libc)Input Modes.
* PARODD: (libc)Control Modes.
* PATH_MAX: (libc)Limits for Files.
* PA_FLAG_MASK: (libc)Parsing a Template String.
* PENDIN: (libc)Local Modes.
* PF_FILE: (libc)Local Namespace Details.
* PF_INET6: (libc)Internet Namespace.
* PF_INET: (libc)Internet Namespace.
* PF_LOCAL: (libc)Local Namespace Details.
* PF_UNIX: (libc)Local Namespace Details.
* PIPE_BUF: (libc)Limits for Files.
* P_tmpdir: (libc)Temporary Files.
* RAND_MAX: (libc)ISO Random.
* RE_DUP_MAX: (libc)General Limits.
* RLIM_INFINITY: (libc)Limits on Resources.
* R_OK: (libc)Testing File Access.
* SA_NOCLDSTOP: (libc)Flags for Sigaction.
* SA_ONSTACK: (libc)Flags for Sigaction.
* SA_RESTART: (libc)Flags for Sigaction.
* SEEK_CUR: (libc)File Positioning.
* SEEK_END: (libc)File Positioning.
* SEEK_SET: (libc)File Positioning.
* SIGABRT: (libc)Program Error Signals.
* SIGALRM: (libc)Alarm Signals.
* SIGBUS: (libc)Program Error Signals.
* SIGCHLD: (libc)Job Control Signals.
* SIGCLD: (libc)Job Control Signals.
* SIGCONT: (libc)Job Control Signals.
* SIGEMT: (libc)Program Error Signals.
* SIGFPE: (libc)Program Error Signals.
* SIGHUP: (libc)Termination Signals.
* SIGILL: (libc)Program Error Signals.
* SIGINFO: (libc)Miscellaneous Signals.
* SIGINT: (libc)Termination Signals.
* SIGIO: (libc)Asynchronous I/O Signals.
* SIGIOT: (libc)Program Error Signals.
* SIGKILL: (libc)Termination Signals.
* SIGLOST: (libc)Operation Error Signals.
* SIGPIPE: (libc)Operation Error Signals.
* SIGPOLL: (libc)Asynchronous I/O Signals.
* SIGPROF: (libc)Alarm Signals.
* SIGQUIT: (libc)Termination Signals.
* SIGSEGV: (libc)Program Error Signals.
* SIGSTOP: (libc)Job Control Signals.
* SIGSYS: (libc)Program Error Signals.
* SIGTERM: (libc)Termination Signals.
* SIGTRAP: (libc)Program Error Signals.
* SIGTSTP: (libc)Job Control Signals.
* SIGTTIN: (libc)Job Control Signals.
* SIGTTOU: (libc)Job Control Signals.
* SIGURG: (libc)Asynchronous I/O Signals.
* SIGUSR1: (libc)Miscellaneous Signals.
* SIGUSR2: (libc)Miscellaneous Signals.
* SIGVTALRM: (libc)Alarm Signals.
* SIGWINCH: (libc)Miscellaneous Signals.
* SIGXCPU: (libc)Operation Error Signals.
* SIGXFSZ: (libc)Operation Error Signals.
* SIG_ERR: (libc)Basic Signal Handling.
* SOCK_DGRAM: (libc)Communication Styles.
* SOCK_RAW: (libc)Communication Styles.
* SOCK_RDM: (libc)Communication Styles.
* SOCK_SEQPACKET: (libc)Communication Styles.
* SOCK_STREAM: (libc)Communication Styles.
* SOL_SOCKET: (libc)Socket-Level Options.
* SSIZE_MAX: (libc)General Limits.
* STREAM_MAX: (libc)General Limits.
* SUN_LEN: (libc)Local Namespace Details.
* SV_INTERRUPT: (libc)BSD Handler.
* SV_ONSTACK: (libc)BSD Handler.
* SV_RESETHAND: (libc)BSD Handler.
* S_IFMT: (libc)Testing File Type.
* S_ISBLK: (libc)Testing File Type.
* S_ISCHR: (libc)Testing File Type.
* S_ISDIR: (libc)Testing File Type.
* S_ISFIFO: (libc)Testing File Type.
* S_ISLNK: (libc)Testing File Type.
* S_ISREG: (libc)Testing File Type.
* S_ISSOCK: (libc)Testing File Type.
* S_TYPEISMQ: (libc)Testing File Type.
* S_TYPEISSEM: (libc)Testing File Type.
* S_TYPEISSHM: (libc)Testing File Type.
* TMP_MAX: (libc)Temporary Files.
* TOSTOP: (libc)Local Modes.
* TZNAME_MAX: (libc)General Limits.
* VDISCARD: (libc)Other Special.
* VDSUSP: (libc)Signal Characters.
* VEOF: (libc)Editing Characters.
* VEOL2: (libc)Editing Characters.
* VEOL: (libc)Editing Characters.
* VERASE: (libc)Editing Characters.
* VINTR: (libc)Signal Characters.
* VKILL: (libc)Editing Characters.
* VLNEXT: (libc)Other Special.
* VMIN: (libc)Noncanonical Input.
* VQUIT: (libc)Signal Characters.
* VREPRINT: (libc)Editing Characters.
* VSTART: (libc)Start/Stop Characters.
* VSTATUS: (libc)Other Special.
* VSTOP: (libc)Start/Stop Characters.
* VSUSP: (libc)Signal Characters.
* VTIME: (libc)Noncanonical Input.
* VWERASE: (libc)Editing Characters.
* WCHAR_MAX: (libc)Extended Char Intro.
* WCHAR_MIN: (libc)Extended Char Intro.
* WCOREDUMP: (libc)Process Completion Status.
* WEOF: (libc)EOF and Errors.
* WEOF: (libc)Extended Char Intro.
* WEXITSTATUS: (libc)Process Completion Status.
* WIFEXITED: (libc)Process Completion Status.
* WIFSIGNALED: (libc)Process Completion Status.
* WIFSTOPPED: (libc)Process Completion Status.
* WSTOPSIG: (libc)Process Completion Status.
* WTERMSIG: (libc)Process Completion Status.
* W_OK: (libc)Testing File Access.
* X_OK: (libc)Testing File Access.
* _Complex_I: (libc)Complex Numbers.
* _Exit: (libc)Termination Internals.
* _IOFBF: (libc)Controlling Buffering.
* _IOLBF: (libc)Controlling Buffering.
* _IONBF: (libc)Controlling Buffering.
* _Imaginary_I: (libc)Complex Numbers.
* _PATH_UTMP: (libc)Manipulating the Database.
* _PATH_WTMP: (libc)Manipulating the Database.
* _POSIX2_C_DEV: (libc)System Options.
* _POSIX2_C_VERSION: (libc)Version Supported.
* _POSIX2_FORT_DEV: (libc)System Options.
* _POSIX2_FORT_RUN: (libc)System Options.
* _POSIX2_LOCALEDEF: (libc)System Options.
* _POSIX2_SW_DEV: (libc)System Options.
* _POSIX_CHOWN_RESTRICTED: (libc)Options for Files.
* _POSIX_JOB_CONTROL: (libc)System Options.
* _POSIX_NO_TRUNC: (libc)Options for Files.
* _POSIX_SAVED_IDS: (libc)System Options.
* _POSIX_VDISABLE: (libc)Options for Files.
* _POSIX_VERSION: (libc)Version Supported.
* __fbufsize: (libc)Controlling Buffering.
* __flbf: (libc)Controlling Buffering.
* __fpending: (libc)Controlling Buffering.
* __fpurge: (libc)Flushing Buffers.
* __freadable: (libc)Opening Streams.
* __freading: (libc)Opening Streams.
* __fsetlocking: (libc)Streams and Threads.
* __fwritable: (libc)Opening Streams.
* __fwriting: (libc)Opening Streams.
* __gconv_end_fct: (libc)glibc iconv Implementation.
* __gconv_fct: (libc)glibc iconv Implementation.
* __gconv_init_fct: (libc)glibc iconv Implementation.
* __ppc_get_timebase: (libc)PowerPC.
* __ppc_get_timebase_freq: (libc)PowerPC.
* __ppc_mdoio: (libc)PowerPC.
* __ppc_mdoom: (libc)PowerPC.
* __ppc_set_ppr_low: (libc)PowerPC.
* __ppc_set_ppr_med: (libc)PowerPC.
* __ppc_set_ppr_med_low: (libc)PowerPC.
* __ppc_yield: (libc)PowerPC.
* __va_copy: (libc)Argument Macros.
* _exit: (libc)Termination Internals.
* _flushlbf: (libc)Flushing Buffers.
* _tolower: (libc)Case Conversion.
* _toupper: (libc)Case Conversion.
* a64l: (libc)Encode Binary Data.
* abort: (libc)Aborting a Program.
* abs: (libc)Absolute Value.
* accept: (libc)Accepting Connections.
* access: (libc)Testing File Access.
* acos: (libc)Inverse Trig Functions.
* acosf: (libc)Inverse Trig Functions.
* acosh: (libc)Hyperbolic Functions.
* acoshf: (libc)Hyperbolic Functions.
* acoshl: (libc)Hyperbolic Functions.
* acosl: (libc)Inverse Trig Functions.
* addmntent: (libc)mtab.
* addseverity: (libc)Adding Severity Classes.
* adjtime: (libc)High-Resolution Calendar.
* adjtimex: (libc)High-Resolution Calendar.
* aio_cancel64: (libc)Cancel AIO Operations.
* aio_cancel: (libc)Cancel AIO Operations.
* aio_error64: (libc)Status of AIO Operations.
* aio_error: (libc)Status of AIO Operations.
* aio_fsync64: (libc)Synchronizing AIO Operations.
* aio_fsync: (libc)Synchronizing AIO Operations.
* aio_init: (libc)Configuration of AIO.
* aio_read64: (libc)Asynchronous Reads/Writes.
* aio_read: (libc)Asynchronous Reads/Writes.
* aio_return64: (libc)Status of AIO Operations.
* aio_return: (libc)Status of AIO Operations.
* aio_suspend64: (libc)Synchronizing AIO Operations.
* aio_suspend: (libc)Synchronizing AIO Operations.
* aio_write64: (libc)Asynchronous Reads/Writes.
* aio_write: (libc)Asynchronous Reads/Writes.
* alarm: (libc)Setting an Alarm.
* alloca: (libc)Variable Size Automatic.
* alphasort64: (libc)Scanning Directory Content.
* alphasort: (libc)Scanning Directory Content.
* argp_error: (libc)Argp Helper Functions.
* argp_failure: (libc)Argp Helper Functions.
* argp_help: (libc)Argp Help.
* argp_parse: (libc)Argp.
* argp_state_help: (libc)Argp Helper Functions.
* argp_usage: (libc)Argp Helper Functions.
* argz_add: (libc)Argz Functions.
* argz_add_sep: (libc)Argz Functions.
* argz_append: (libc)Argz Functions.
* argz_count: (libc)Argz Functions.
* argz_create: (libc)Argz Functions.
* argz_create_sep: (libc)Argz Functions.
* argz_delete: (libc)Argz Functions.
* argz_extract: (libc)Argz Functions.
* argz_insert: (libc)Argz Functions.
* argz_next: (libc)Argz Functions.
* argz_replace: (libc)Argz Functions.
* argz_stringify: (libc)Argz Functions.
* asctime: (libc)Formatting Calendar Time.
* asctime_r: (libc)Formatting Calendar Time.
* asin: (libc)Inverse Trig Functions.
* asinf: (libc)Inverse Trig Functions.
* asinh: (libc)Hyperbolic Functions.
* asinhf: (libc)Hyperbolic Functions.
* asinhl: (libc)Hyperbolic Functions.
* asinl: (libc)Inverse Trig Functions.
* asprintf: (libc)Dynamic Output.
* assert: (libc)Consistency Checking.
* assert_perror: (libc)Consistency Checking.
* atan2: (libc)Inverse Trig Functions.
* atan2f: (libc)Inverse Trig Functions.
* atan2l: (libc)Inverse Trig Functions.
* atan: (libc)Inverse Trig Functions.
* atanf: (libc)Inverse Trig Functions.
* atanh: (libc)Hyperbolic Functions.
* atanhf: (libc)Hyperbolic Functions.
* atanhl: (libc)Hyperbolic Functions.
* atanl: (libc)Inverse Trig Functions.
* atexit: (libc)Cleanups on Exit.
* atof: (libc)Parsing of Floats.
* atoi: (libc)Parsing of Integers.
* atol: (libc)Parsing of Integers.
* atoll: (libc)Parsing of Integers.
* backtrace: (libc)Backtraces.
* backtrace_symbols: (libc)Backtraces.
* backtrace_symbols_fd: (libc)Backtraces.
* basename: (libc)Finding Tokens in a String.
* basename: (libc)Finding Tokens in a String.
* bcmp: (libc)String/Array Comparison.
* bcopy: (libc)Copying and Concatenation.
* bind: (libc)Setting Address.
* bind_textdomain_codeset: (libc)Charset conversion in gettext.
* bindtextdomain: (libc)Locating gettext catalog.
* brk: (libc)Resizing the Data Segment.
* bsearch: (libc)Array Search Function.
* btowc: (libc)Converting a Character.
* bzero: (libc)Copying and Concatenation.
* cabs: (libc)Absolute Value.
* cabsf: (libc)Absolute Value.
* cabsl: (libc)Absolute Value.
* cacos: (libc)Inverse Trig Functions.
* cacosf: (libc)Inverse Trig Functions.
* cacosh: (libc)Hyperbolic Functions.
* cacoshf: (libc)Hyperbolic Functions.
* cacoshl: (libc)Hyperbolic Functions.
* cacosl: (libc)Inverse Trig Functions.
* calloc: (libc)Allocating Cleared Space.
* canonicalize_file_name: (libc)Symbolic Links.
* carg: (libc)Operations on Complex.
* cargf: (libc)Operations on Complex.
* cargl: (libc)Operations on Complex.
* casin: (libc)Inverse Trig Functions.
* casinf: (libc)Inverse Trig Functions.
* casinh: (libc)Hyperbolic Functions.
* casinhf: (libc)Hyperbolic Functions.
* casinhl: (libc)Hyperbolic Functions.
* casinl: (libc)Inverse Trig Functions.
* catan: (libc)Inverse Trig Functions.
* catanf: (libc)Inverse Trig Functions.
* catanh: (libc)Hyperbolic Functions.
* catanhf: (libc)Hyperbolic Functions.
* catanhl: (libc)Hyperbolic Functions.
* catanl: (libc)Inverse Trig Functions.
* catclose: (libc)The catgets Functions.
* catgets: (libc)The catgets Functions.
* catopen: (libc)The catgets Functions.
* cbc_crypt: (libc)DES Encryption.
* cbrt: (libc)Exponents and Logarithms.
* cbrtf: (libc)Exponents and Logarithms.
* cbrtl: (libc)Exponents and Logarithms.
* ccos: (libc)Trig Functions.
* ccosf: (libc)Trig Functions.
* ccosh: (libc)Hyperbolic Functions.
* ccoshf: (libc)Hyperbolic Functions.
* ccoshl: (libc)Hyperbolic Functions.
* ccosl: (libc)Trig Functions.
* ceil: (libc)Rounding Functions.
* ceilf: (libc)Rounding Functions.
* ceill: (libc)Rounding Functions.
* cexp: (libc)Exponents and Logarithms.
* cexpf: (libc)Exponents and Logarithms.
* cexpl: (libc)Exponents and Logarithms.
* cfgetispeed: (libc)Line Speed.
* cfgetospeed: (libc)Line Speed.
* cfmakeraw: (libc)Noncanonical Input.
* cfree: (libc)Freeing after Malloc.
* cfsetispeed: (libc)Line Speed.
* cfsetospeed: (libc)Line Speed.
* cfsetspeed: (libc)Line Speed.
* chdir: (libc)Working Directory.
* chmod: (libc)Setting Permissions.
* chown: (libc)File Owner.
* cimag: (libc)Operations on Complex.
* cimagf: (libc)Operations on Complex.
* cimagl: (libc)Operations on Complex.
* clearenv: (libc)Environment Access.
* clearerr: (libc)Error Recovery.
* clearerr_unlocked: (libc)Error Recovery.
* clock: (libc)CPU Time.
* clog10: (libc)Exponents and Logarithms.
* clog10f: (libc)Exponents and Logarithms.
* clog10l: (libc)Exponents and Logarithms.
* clog: (libc)Exponents and Logarithms.
* clogf: (libc)Exponents and Logarithms.
* clogl: (libc)Exponents and Logarithms.
* close: (libc)Opening and Closing Files.
* closedir: (libc)Reading/Closing Directory.
* closelog: (libc)closelog.
* confstr: (libc)String Parameters.
* conj: (libc)Operations on Complex.
* conjf: (libc)Operations on Complex.
* conjl: (libc)Operations on Complex.
* connect: (libc)Connecting.
* copysign: (libc)FP Bit Twiddling.
* copysignf: (libc)FP Bit Twiddling.
* copysignl: (libc)FP Bit Twiddling.
* cos: (libc)Trig Functions.
* cosf: (libc)Trig Functions.
* cosh: (libc)Hyperbolic Functions.
* coshf: (libc)Hyperbolic Functions.
* coshl: (libc)Hyperbolic Functions.
* cosl: (libc)Trig Functions.
* cpow: (libc)Exponents and Logarithms.
* cpowf: (libc)Exponents and Logarithms.
* cpowl: (libc)Exponents and Logarithms.
* cproj: (libc)Operations on Complex.
* cprojf: (libc)Operations on Complex.
* cprojl: (libc)Operations on Complex.
* creal: (libc)Operations on Complex.
* crealf: (libc)Operations on Complex.
* creall: (libc)Operations on Complex.
* creat64: (libc)Opening and Closing Files.
* creat: (libc)Opening and Closing Files.
* crypt: (libc)crypt.
* crypt_r: (libc)crypt.
* csin: (libc)Trig Functions.
* csinf: (libc)Trig Functions.
* csinh: (libc)Hyperbolic Functions.
* csinhf: (libc)Hyperbolic Functions.
* csinhl: (libc)Hyperbolic Functions.
* csinl: (libc)Trig Functions.
* csqrt: (libc)Exponents and Logarithms.
* csqrtf: (libc)Exponents and Logarithms.
* csqrtl: (libc)Exponents and Logarithms.
* ctan: (libc)Trig Functions.
* ctanf: (libc)Trig Functions.
* ctanh: (libc)Hyperbolic Functions.
* ctanhf: (libc)Hyperbolic Functions.
* ctanhl: (libc)Hyperbolic Functions.
* ctanl: (libc)Trig Functions.
* ctermid: (libc)Identifying the Terminal.
* ctime: (libc)Formatting Calendar Time.
* ctime_r: (libc)Formatting Calendar Time.
* cuserid: (libc)Who Logged In.
* dcgettext: (libc)Translation with gettext.
* dcngettext: (libc)Advanced gettext functions.
* des_setparity: (libc)DES Encryption.
* dgettext: (libc)Translation with gettext.
* difftime: (libc)Elapsed Time.
* dirfd: (libc)Opening a Directory.
* dirname: (libc)Finding Tokens in a String.
* div: (libc)Integer Division.
* dngettext: (libc)Advanced gettext functions.
* drand48: (libc)SVID Random.
* drand48_r: (libc)SVID Random.
* drem: (libc)Remainder Functions.
* dremf: (libc)Remainder Functions.
* dreml: (libc)Remainder Functions.
* dup2: (libc)Duplicating Descriptors.
* dup: (libc)Duplicating Descriptors.
* ecb_crypt: (libc)DES Encryption.
* ecvt: (libc)System V Number Conversion.
* ecvt_r: (libc)System V Number Conversion.
* encrypt: (libc)DES Encryption.
* encrypt_r: (libc)DES Encryption.
* endfsent: (libc)fstab.
* endgrent: (libc)Scanning All Groups.
* endhostent: (libc)Host Names.
* endmntent: (libc)mtab.
* endnetent: (libc)Networks Database.
* endnetgrent: (libc)Lookup Netgroup.
* endprotoent: (libc)Protocols Database.
* endpwent: (libc)Scanning All Users.
* endservent: (libc)Services Database.
* endutent: (libc)Manipulating the Database.
* endutxent: (libc)XPG Functions.
* envz_add: (libc)Envz Functions.
* envz_entry: (libc)Envz Functions.
* envz_get: (libc)Envz Functions.
* envz_merge: (libc)Envz Functions.
* envz_strip: (libc)Envz Functions.
* erand48: (libc)SVID Random.
* erand48_r: (libc)SVID Random.
* erf: (libc)Special Functions.
* erfc: (libc)Special Functions.
* erfcf: (libc)Special Functions.
* erfcl: (libc)Special Functions.
* erff: (libc)Special Functions.
* erfl: (libc)Special Functions.
* err: (libc)Error Messages.
* errno: (libc)Checking for Errors.
* error: (libc)Error Messages.
* error_at_line: (libc)Error Messages.
* errx: (libc)Error Messages.
* execl: (libc)Executing a File.
* execle: (libc)Executing a File.
* execlp: (libc)Executing a File.
* execv: (libc)Executing a File.
* execve: (libc)Executing a File.
* execvp: (libc)Executing a File.
* exit: (libc)Normal Termination.
* exp10: (libc)Exponents and Logarithms.
* exp10f: (libc)Exponents and Logarithms.
* exp10l: (libc)Exponents and Logarithms.
* exp2: (libc)Exponents and Logarithms.
* exp2f: (libc)Exponents and Logarithms.
* exp2l: (libc)Exponents and Logarithms.
* exp: (libc)Exponents and Logarithms.
* expf: (libc)Exponents and Logarithms.
* expl: (libc)Exponents and Logarithms.
* expm1: (libc)Exponents and Logarithms.
* expm1f: (libc)Exponents and Logarithms.
* expm1l: (libc)Exponents and Logarithms.
* fabs: (libc)Absolute Value.
* fabsf: (libc)Absolute Value.
* fabsl: (libc)Absolute Value.
* fchdir: (libc)Working Directory.
* fchmod: (libc)Setting Permissions.
* fchown: (libc)File Owner.
* fclose: (libc)Closing Streams.
* fcloseall: (libc)Closing Streams.
* fcntl: (libc)Control Operations.
* fcvt: (libc)System V Number Conversion.
* fcvt_r: (libc)System V Number Conversion.
* fdatasync: (libc)Synchronizing I/O.
* fdim: (libc)Misc FP Arithmetic.
* fdimf: (libc)Misc FP Arithmetic.
* fdiml: (libc)Misc FP Arithmetic.
* fdopen: (libc)Descriptors and Streams.
* fdopendir: (libc)Opening a Directory.
* feclearexcept: (libc)Status bit operations.
* fedisableexcept: (libc)Control Functions.
* feenableexcept: (libc)Control Functions.
* fegetenv: (libc)Control Functions.
* fegetexcept: (libc)Control Functions.
* fegetexceptflag: (libc)Status bit operations.
* fegetround: (libc)Rounding.
* feholdexcept: (libc)Control Functions.
* feof: (libc)EOF and Errors.
* feof_unlocked: (libc)EOF and Errors.
* feraiseexcept: (libc)Status bit operations.
* ferror: (libc)EOF and Errors.
* ferror_unlocked: (libc)EOF and Errors.
* fesetenv: (libc)Control Functions.
* fesetexceptflag: (libc)Status bit operations.
* fesetround: (libc)Rounding.
* fetestexcept: (libc)Status bit operations.
* feupdateenv: (libc)Control Functions.
* fflush: (libc)Flushing Buffers.
* fflush_unlocked: (libc)Flushing Buffers.
* fgetc: (libc)Character Input.
* fgetc_unlocked: (libc)Character Input.
* fgetgrent: (libc)Scanning All Groups.
* fgetgrent_r: (libc)Scanning All Groups.
* fgetpos64: (libc)Portable Positioning.
* fgetpos: (libc)Portable Positioning.
* fgetpwent: (libc)Scanning All Users.
* fgetpwent_r: (libc)Scanning All Users.
* fgets: (libc)Line Input.
* fgets_unlocked: (libc)Line Input.
* fgetwc: (libc)Character Input.
* fgetwc_unlocked: (libc)Character Input.
* fgetws: (libc)Line Input.
* fgetws_unlocked: (libc)Line Input.
* fileno: (libc)Descriptors and Streams.
* fileno_unlocked: (libc)Descriptors and Streams.
* finite: (libc)Floating Point Classes.
* finitef: (libc)Floating Point Classes.
* finitel: (libc)Floating Point Classes.
* flockfile: (libc)Streams and Threads.
* floor: (libc)Rounding Functions.
* floorf: (libc)Rounding Functions.
* floorl: (libc)Rounding Functions.
* fma: (libc)Misc FP Arithmetic.
* fmaf: (libc)Misc FP Arithmetic.
* fmal: (libc)Misc FP Arithmetic.
* fmax: (libc)Misc FP Arithmetic.
* fmaxf: (libc)Misc FP Arithmetic.
* fmaxl: (libc)Misc FP Arithmetic.
* fmemopen: (libc)String Streams.
* fmin: (libc)Misc FP Arithmetic.
* fminf: (libc)Misc FP Arithmetic.
* fminl: (libc)Misc FP Arithmetic.
* fmod: (libc)Remainder Functions.
* fmodf: (libc)Remainder Functions.
* fmodl: (libc)Remainder Functions.
* fmtmsg: (libc)Printing Formatted Messages.
* fnmatch: (libc)Wildcard Matching.
* fopen64: (libc)Opening Streams.
* fopen: (libc)Opening Streams.
* fopencookie: (libc)Streams and Cookies.
* fork: (libc)Creating a Process.
* forkpty: (libc)Pseudo-Terminal Pairs.
* fpathconf: (libc)Pathconf.
* fpclassify: (libc)Floating Point Classes.
* fprintf: (libc)Formatted Output Functions.
* fputc: (libc)Simple Output.
* fputc_unlocked: (libc)Simple Output.
* fputs: (libc)Simple Output.
* fputs_unlocked: (libc)Simple Output.
* fputwc: (libc)Simple Output.
* fputwc_unlocked: (libc)Simple Output.
* fputws: (libc)Simple Output.
* fputws_unlocked: (libc)Simple Output.
* fread: (libc)Block Input/Output.
* fread_unlocked: (libc)Block Input/Output.
* free: (libc)Freeing after Malloc.
* freopen64: (libc)Opening Streams.
* freopen: (libc)Opening Streams.
* frexp: (libc)Normalization Functions.
* frexpf: (libc)Normalization Functions.
* frexpl: (libc)Normalization Functions.
* fscanf: (libc)Formatted Input Functions.
* fseek: (libc)File Positioning.
* fseeko64: (libc)File Positioning.
* fseeko: (libc)File Positioning.
* fsetpos64: (libc)Portable Positioning.
* fsetpos: (libc)Portable Positioning.
* fstat64: (libc)Reading Attributes.
* fstat: (libc)Reading Attributes.
* fsync: (libc)Synchronizing I/O.
* ftell: (libc)File Positioning.
* ftello64: (libc)File Positioning.
* ftello: (libc)File Positioning.
* ftruncate64: (libc)File Size.
* ftruncate: (libc)File Size.
* ftrylockfile: (libc)Streams and Threads.
* ftw64: (libc)Working with Directory Trees.
* ftw: (libc)Working with Directory Trees.
* funlockfile: (libc)Streams and Threads.
* futimes: (libc)File Times.
* fwide: (libc)Streams and I18N.
* fwprintf: (libc)Formatted Output Functions.
* fwrite: (libc)Block Input/Output.
* fwrite_unlocked: (libc)Block Input/Output.
* fwscanf: (libc)Formatted Input Functions.
* gamma: (libc)Special Functions.
* gammaf: (libc)Special Functions.
* gammal: (libc)Special Functions.
* gcvt: (libc)System V Number Conversion.
* get_avphys_pages: (libc)Query Memory Parameters.
* get_current_dir_name: (libc)Working Directory.
* get_nprocs: (libc)Processor Resources.
* get_nprocs_conf: (libc)Processor Resources.
* get_phys_pages: (libc)Query Memory Parameters.
* getauxval: (libc)Auxiliary Vector.
* getc: (libc)Character Input.
* getc_unlocked: (libc)Character Input.
* getchar: (libc)Character Input.
* getchar_unlocked: (libc)Character Input.
* getcontext: (libc)System V contexts.
* getcwd: (libc)Working Directory.
* getdate: (libc)General Time String Parsing.
* getdate_r: (libc)General Time String Parsing.
* getdelim: (libc)Line Input.
* getdomainnname: (libc)Host Identification.
* getegid: (libc)Reading Persona.
* getenv: (libc)Environment Access.
* geteuid: (libc)Reading Persona.
* getfsent: (libc)fstab.
* getfsfile: (libc)fstab.
* getfsspec: (libc)fstab.
* getgid: (libc)Reading Persona.
* getgrent: (libc)Scanning All Groups.
* getgrent_r: (libc)Scanning All Groups.
* getgrgid: (libc)Lookup Group.
* getgrgid_r: (libc)Lookup Group.
* getgrnam: (libc)Lookup Group.
* getgrnam_r: (libc)Lookup Group.
* getgrouplist: (libc)Setting Groups.
* getgroups: (libc)Reading Persona.
* gethostbyaddr: (libc)Host Names.
* gethostbyaddr_r: (libc)Host Names.
* gethostbyname2: (libc)Host Names.
* gethostbyname2_r: (libc)Host Names.
* gethostbyname: (libc)Host Names.
* gethostbyname_r: (libc)Host Names.
* gethostent: (libc)Host Names.
* gethostid: (libc)Host Identification.
* gethostname: (libc)Host Identification.
* getitimer: (libc)Setting an Alarm.
* getline: (libc)Line Input.
* getloadavg: (libc)Processor Resources.
* getlogin: (libc)Who Logged In.
* getmntent: (libc)mtab.
* getmntent_r: (libc)mtab.
* getnetbyaddr: (libc)Networks Database.
* getnetbyname: (libc)Networks Database.
* getnetent: (libc)Networks Database.
* getnetgrent: (libc)Lookup Netgroup.
* getnetgrent_r: (libc)Lookup Netgroup.
* getopt: (libc)Using Getopt.
* getopt_long: (libc)Getopt Long Options.
* getopt_long_only: (libc)Getopt Long Options.
* getpagesize: (libc)Query Memory Parameters.
* getpass: (libc)getpass.
* getpeername: (libc)Who is Connected.
* getpgid: (libc)Process Group Functions.
* getpgrp: (libc)Process Group Functions.
* getpgrp: (libc)Process Group Functions.
* getpid: (libc)Process Identification.
* getppid: (libc)Process Identification.
* getpriority: (libc)Traditional Scheduling Functions.
* getprotobyname: (libc)Protocols Database.
* getprotobynumber: (libc)Protocols Database.
* getprotoent: (libc)Protocols Database.
* getpt: (libc)Allocation.
* getpwent: (libc)Scanning All Users.
* getpwent_r: (libc)Scanning All Users.
* getpwnam: (libc)Lookup User.
* getpwnam_r: (libc)Lookup User.
* getpwuid: (libc)Lookup User.
* getpwuid_r: (libc)Lookup User.
* getrlimit64: (libc)Limits on Resources.
* getrlimit: (libc)Limits on Resources.
* getrusage: (libc)Resource Usage.
* gets: (libc)Line Input.
* getservbyname: (libc)Services Database.
* getservbyport: (libc)Services Database.
* getservent: (libc)Services Database.
* getsid: (libc)Process Group Functions.
* getsockname: (libc)Reading Address.
* getsockopt: (libc)Socket Option Functions.
* getsubopt: (libc)Suboptions.
* gettext: (libc)Translation with gettext.
* gettimeofday: (libc)High-Resolution Calendar.
* getuid: (libc)Reading Persona.
* getumask: (libc)Setting Permissions.
* getutent: (libc)Manipulating the Database.
* getutent_r: (libc)Manipulating the Database.
* getutid: (libc)Manipulating the Database.
* getutid_r: (libc)Manipulating the Database.
* getutline: (libc)Manipulating the Database.
* getutline_r: (libc)Manipulating the Database.
* getutmp: (libc)XPG Functions.
* getutmpx: (libc)XPG Functions.
* getutxent: (libc)XPG Functions.
* getutxid: (libc)XPG Functions.
* getutxline: (libc)XPG Functions.
* getw: (libc)Character Input.
* getwc: (libc)Character Input.
* getwc_unlocked: (libc)Character Input.
* getwchar: (libc)Character Input.
* getwchar_unlocked: (libc)Character Input.
* getwd: (libc)Working Directory.
* glob64: (libc)Calling Glob.
* glob: (libc)Calling Glob.
* globfree64: (libc)More Flags for Globbing.
* globfree: (libc)More Flags for Globbing.
* gmtime: (libc)Broken-down Time.
* gmtime_r: (libc)Broken-down Time.
* grantpt: (libc)Allocation.
* gsignal: (libc)Signaling Yourself.
* gtty: (libc)BSD Terminal Modes.
* hasmntopt: (libc)mtab.
* hcreate: (libc)Hash Search Function.
* hcreate_r: (libc)Hash Search Function.
* hdestroy: (libc)Hash Search Function.
* hdestroy_r: (libc)Hash Search Function.
* hsearch: (libc)Hash Search Function.
* hsearch_r: (libc)Hash Search Function.
* htonl: (libc)Byte Order.
* htons: (libc)Byte Order.
* hypot: (libc)Exponents and Logarithms.
* hypotf: (libc)Exponents and Logarithms.
* hypotl: (libc)Exponents and Logarithms.
* iconv: (libc)Generic Conversion Interface.
* iconv_close: (libc)Generic Conversion Interface.
* iconv_open: (libc)Generic Conversion Interface.
* if_freenameindex: (libc)Interface Naming.
* if_indextoname: (libc)Interface Naming.
* if_nameindex: (libc)Interface Naming.
* if_nametoindex: (libc)Interface Naming.
* ilogb: (libc)Exponents and Logarithms.
* ilogbf: (libc)Exponents and Logarithms.
* ilogbl: (libc)Exponents and Logarithms.
* imaxabs: (libc)Absolute Value.
* imaxdiv: (libc)Integer Division.
* in6addr_any: (libc)Host Address Data Type.
* in6addr_loopback: (libc)Host Address Data Type.
* index: (libc)Search Functions.
* inet_addr: (libc)Host Address Functions.
* inet_aton: (libc)Host Address Functions.
* inet_lnaof: (libc)Host Address Functions.
* inet_makeaddr: (libc)Host Address Functions.
* inet_netof: (libc)Host Address Functions.
* inet_network: (libc)Host Address Functions.
* inet_ntoa: (libc)Host Address Functions.
* inet_ntop: (libc)Host Address Functions.
* inet_pton: (libc)Host Address Functions.
* initgroups: (libc)Setting Groups.
* initstate: (libc)BSD Random.
* initstate_r: (libc)BSD Random.
* innetgr: (libc)Netgroup Membership.
* ioctl: (libc)IOCTLs.
* isalnum: (libc)Classification of Characters.
* isalpha: (libc)Classification of Characters.
* isascii: (libc)Classification of Characters.
* isatty: (libc)Is It a Terminal.
* isblank: (libc)Classification of Characters.
* iscntrl: (libc)Classification of Characters.
* isdigit: (libc)Classification of Characters.
* isfinite: (libc)Floating Point Classes.
* isgraph: (libc)Classification of Characters.
* isgreater: (libc)FP Comparison Functions.
* isgreaterequal: (libc)FP Comparison Functions.
* isinf: (libc)Floating Point Classes.
* isinff: (libc)Floating Point Classes.
* isinfl: (libc)Floating Point Classes.
* isless: (libc)FP Comparison Functions.
* islessequal: (libc)FP Comparison Functions.
* islessgreater: (libc)FP Comparison Functions.
* islower: (libc)Classification of Characters.
* isnan: (libc)Floating Point Classes.
* isnan: (libc)Floating Point Classes.
* isnanf: (libc)Floating Point Classes.
* isnanl: (libc)Floating Point Classes.
* isnormal: (libc)Floating Point Classes.
* isprint: (libc)Classification of Characters.
* ispunct: (libc)Classification of Characters.
* issignaling: (libc)Floating Point Classes.
* isspace: (libc)Classification of Characters.
* isunordered: (libc)FP Comparison Functions.
* isupper: (libc)Classification of Characters.
* iswalnum: (libc)Classification of Wide Characters.
* iswalpha: (libc)Classification of Wide Characters.
* iswblank: (libc)Classification of Wide Characters.
* iswcntrl: (libc)Classification of Wide Characters.
* iswctype: (libc)Classification of Wide Characters.
* iswdigit: (libc)Classification of Wide Characters.
* iswgraph: (libc)Classification of Wide Characters.
* iswlower: (libc)Classification of Wide Characters.
* iswprint: (libc)Classification of Wide Characters.
* iswpunct: (libc)Classification of Wide Characters.
* iswspace: (libc)Classification of Wide Characters.
* iswupper: (libc)Classification of Wide Characters.
* iswxdigit: (libc)Classification of Wide Characters.
* isxdigit: (libc)Classification of Characters.
* j0: (libc)Special Functions.
* j0f: (libc)Special Functions.
* j0l: (libc)Special Functions.
* j1: (libc)Special Functions.
* j1f: (libc)Special Functions.
* j1l: (libc)Special Functions.
* jn: (libc)Special Functions.
* jnf: (libc)Special Functions.
* jnl: (libc)Special Functions.
* jrand48: (libc)SVID Random.
* jrand48_r: (libc)SVID Random.
* kill: (libc)Signaling Another Process.
* killpg: (libc)Signaling Another Process.
* l64a: (libc)Encode Binary Data.
* labs: (libc)Absolute Value.
* lcong48: (libc)SVID Random.
* lcong48_r: (libc)SVID Random.
* ldexp: (libc)Normalization Functions.
* ldexpf: (libc)Normalization Functions.
* ldexpl: (libc)Normalization Functions.
* ldiv: (libc)Integer Division.
* lfind: (libc)Array Search Function.
* lgamma: (libc)Special Functions.
* lgamma_r: (libc)Special Functions.
* lgammaf: (libc)Special Functions.
* lgammaf_r: (libc)Special Functions.
* lgammal: (libc)Special Functions.
* lgammal_r: (libc)Special Functions.
* link: (libc)Hard Links.
* lio_listio64: (libc)Asynchronous Reads/Writes.
* lio_listio: (libc)Asynchronous Reads/Writes.
* listen: (libc)Listening.
* llabs: (libc)Absolute Value.
* lldiv: (libc)Integer Division.
* llrint: (libc)Rounding Functions.
* llrintf: (libc)Rounding Functions.
* llrintl: (libc)Rounding Functions.
* llround: (libc)Rounding Functions.
* llroundf: (libc)Rounding Functions.
* llroundl: (libc)Rounding Functions.
* localeconv: (libc)The Lame Way to Locale Data.
* localtime: (libc)Broken-down Time.
* localtime_r: (libc)Broken-down Time.
* log10: (libc)Exponents and Logarithms.
* log10f: (libc)Exponents and Logarithms.
* log10l: (libc)Exponents and Logarithms.
* log1p: (libc)Exponents and Logarithms.
* log1pf: (libc)Exponents and Logarithms.
* log1pl: (libc)Exponents and Logarithms.
* log2: (libc)Exponents and Logarithms.
* log2f: (libc)Exponents and Logarithms.
* log2l: (libc)Exponents and Logarithms.
* log: (libc)Exponents and Logarithms.
* logb: (libc)Exponents and Logarithms.
* logbf: (libc)Exponents and Logarithms.
* logbl: (libc)Exponents and Logarithms.
* logf: (libc)Exponents and Logarithms.
* login: (libc)Logging In and Out.
* login_tty: (libc)Logging In and Out.
* logl: (libc)Exponents and Logarithms.
* logout: (libc)Logging In and Out.
* logwtmp: (libc)Logging In and Out.
* longjmp: (libc)Non-Local Details.
* lrand48: (libc)SVID Random.
* lrand48_r: (libc)SVID Random.
* lrint: (libc)Rounding Functions.
* lrintf: (libc)Rounding Functions.
* lrintl: (libc)Rounding Functions.
* lround: (libc)Rounding Functions.
* lroundf: (libc)Rounding Functions.
* lroundl: (libc)Rounding Functions.
* lsearch: (libc)Array Search Function.
* lseek64: (libc)File Position Primitive.
* lseek: (libc)File Position Primitive.
* lstat64: (libc)Reading Attributes.
* lstat: (libc)Reading Attributes.
* lutimes: (libc)File Times.
* madvise: (libc)Memory-mapped I/O.
* makecontext: (libc)System V contexts.
* mallinfo: (libc)Statistics of Malloc.
* malloc: (libc)Basic Allocation.
* mallopt: (libc)Malloc Tunable Parameters.
* mblen: (libc)Non-reentrant Character Conversion.
* mbrlen: (libc)Converting a Character.
* mbrtowc: (libc)Converting a Character.
* mbsinit: (libc)Keeping the state.
* mbsnrtowcs: (libc)Converting Strings.
* mbsrtowcs: (libc)Converting Strings.
* mbstowcs: (libc)Non-reentrant String Conversion.
* mbtowc: (libc)Non-reentrant Character Conversion.
* mcheck: (libc)Heap Consistency Checking.
* memalign: (libc)Aligned Memory Blocks.
* memccpy: (libc)Copying and Concatenation.
* memchr: (libc)Search Functions.
* memcmp: (libc)String/Array Comparison.
* memcpy: (libc)Copying and Concatenation.
* memfrob: (libc)Trivial Encryption.
* memmem: (libc)Search Functions.
* memmove: (libc)Copying and Concatenation.
* mempcpy: (libc)Copying and Concatenation.
* memrchr: (libc)Search Functions.
* memset: (libc)Copying and Concatenation.
* mkdir: (libc)Creating Directories.
* mkdtemp: (libc)Temporary Files.
* mkfifo: (libc)FIFO Special Files.
* mknod: (libc)Making Special Files.
* mkstemp: (libc)Temporary Files.
* mktemp: (libc)Temporary Files.
* mktime: (libc)Broken-down Time.
* mlock: (libc)Page Lock Functions.
* mlockall: (libc)Page Lock Functions.
* mmap64: (libc)Memory-mapped I/O.
* mmap: (libc)Memory-mapped I/O.
* modf: (libc)Rounding Functions.
* modff: (libc)Rounding Functions.
* modfl: (libc)Rounding Functions.
* mount: (libc)Mount-Unmount-Remount.
* mprobe: (libc)Heap Consistency Checking.
* mrand48: (libc)SVID Random.
* mrand48_r: (libc)SVID Random.
* mremap: (libc)Memory-mapped I/O.
* msync: (libc)Memory-mapped I/O.
* mtrace: (libc)Tracing malloc.
* munlock: (libc)Page Lock Functions.
* munlockall: (libc)Page Lock Functions.
* munmap: (libc)Memory-mapped I/O.
* muntrace: (libc)Tracing malloc.
* nan: (libc)FP Bit Twiddling.
* nanf: (libc)FP Bit Twiddling.
* nanl: (libc)FP Bit Twiddling.
* nanosleep: (libc)Sleeping.
* nearbyint: (libc)Rounding Functions.
* nearbyintf: (libc)Rounding Functions.
* nearbyintl: (libc)Rounding Functions.
* nextafter: (libc)FP Bit Twiddling.
* nextafterf: (libc)FP Bit Twiddling.
* nextafterl: (libc)FP Bit Twiddling.
* nexttoward: (libc)FP Bit Twiddling.
* nexttowardf: (libc)FP Bit Twiddling.
* nexttowardl: (libc)FP Bit Twiddling.
* nftw64: (libc)Working with Directory Trees.
* nftw: (libc)Working with Directory Trees.
* ngettext: (libc)Advanced gettext functions.
* nice: (libc)Traditional Scheduling Functions.
* nl_langinfo: (libc)The Elegant and Fast Way.
* nrand48: (libc)SVID Random.
* nrand48_r: (libc)SVID Random.
* ntohl: (libc)Byte Order.
* ntohs: (libc)Byte Order.
* ntp_adjtime: (libc)High Accuracy Clock.
* ntp_gettime: (libc)High Accuracy Clock.
* obstack_1grow: (libc)Growing Objects.
* obstack_1grow_fast: (libc)Extra Fast Growing.
* obstack_alignment_mask: (libc)Obstacks Data Alignment.
* obstack_alloc: (libc)Allocation in an Obstack.
* obstack_base: (libc)Status of an Obstack.
* obstack_blank: (libc)Growing Objects.
* obstack_blank_fast: (libc)Extra Fast Growing.
* obstack_chunk_size: (libc)Obstack Chunks.
* obstack_copy0: (libc)Allocation in an Obstack.
* obstack_copy: (libc)Allocation in an Obstack.
* obstack_finish: (libc)Growing Objects.
* obstack_free: (libc)Freeing Obstack Objects.
* obstack_grow0: (libc)Growing Objects.
* obstack_grow: (libc)Growing Objects.
* obstack_init: (libc)Preparing for Obstacks.
* obstack_int_grow: (libc)Growing Objects.
* obstack_int_grow_fast: (libc)Extra Fast Growing.
* obstack_next_free: (libc)Status of an Obstack.
* obstack_object_size: (libc)Growing Objects.
* obstack_object_size: (libc)Status of an Obstack.
* obstack_printf: (libc)Dynamic Output.
* obstack_ptr_grow: (libc)Growing Objects.
* obstack_ptr_grow_fast: (libc)Extra Fast Growing.
* obstack_room: (libc)Extra Fast Growing.
* obstack_vprintf: (libc)Variable Arguments Output.
* offsetof: (libc)Structure Measurement.
* on_exit: (libc)Cleanups on Exit.
* open64: (libc)Opening and Closing Files.
* open: (libc)Opening and Closing Files.
* open_memstream: (libc)String Streams.
* opendir: (libc)Opening a Directory.
* openlog: (libc)openlog.
* openpty: (libc)Pseudo-Terminal Pairs.
* parse_printf_format: (libc)Parsing a Template String.
* pathconf: (libc)Pathconf.
* pause: (libc)Using Pause.
* pclose: (libc)Pipe to a Subprocess.
* perror: (libc)Error Messages.
* pipe: (libc)Creating a Pipe.
* popen: (libc)Pipe to a Subprocess.
* posix_memalign: (libc)Aligned Memory Blocks.
* pow10: (libc)Exponents and Logarithms.
* pow10f: (libc)Exponents and Logarithms.
* pow10l: (libc)Exponents and Logarithms.
* pow: (libc)Exponents and Logarithms.
* powf: (libc)Exponents and Logarithms.
* powl: (libc)Exponents and Logarithms.
* pread64: (libc)I/O Primitives.
* pread: (libc)I/O Primitives.
* printf: (libc)Formatted Output Functions.
* printf_size: (libc)Predefined Printf Handlers.
* printf_size_info: (libc)Predefined Printf Handlers.
* psignal: (libc)Signal Messages.
* pthread_getattr_default_np: (libc)Default Thread Attributes.
* pthread_getattr_default_np: (libc)Default Thread Attributes.
* ptsname: (libc)Allocation.
* ptsname_r: (libc)Allocation.
* putc: (libc)Simple Output.
* putc_unlocked: (libc)Simple Output.
* putchar: (libc)Simple Output.
* putchar_unlocked: (libc)Simple Output.
* putenv: (libc)Environment Access.
* putpwent: (libc)Writing a User Entry.
* puts: (libc)Simple Output.
* pututline: (libc)Manipulating the Database.
* pututxline: (libc)XPG Functions.
* putw: (libc)Simple Output.
* putwc: (libc)Simple Output.
* putwc_unlocked: (libc)Simple Output.
* putwchar: (libc)Simple Output.
* putwchar_unlocked: (libc)Simple Output.
* pwrite64: (libc)I/O Primitives.
* pwrite: (libc)I/O Primitives.
* qecvt: (libc)System V Number Conversion.
* qecvt_r: (libc)System V Number Conversion.
* qfcvt: (libc)System V Number Conversion.
* qfcvt_r: (libc)System V Number Conversion.
* qgcvt: (libc)System V Number Conversion.
* qsort: (libc)Array Sort Function.
* raise: (libc)Signaling Yourself.
* rand: (libc)ISO Random.
* rand_r: (libc)ISO Random.
* random: (libc)BSD Random.
* random_r: (libc)BSD Random.
* rawmemchr: (libc)Search Functions.
* read: (libc)I/O Primitives.
* readdir64: (libc)Reading/Closing Directory.
* readdir64_r: (libc)Reading/Closing Directory.
* readdir: (libc)Reading/Closing Directory.
* readdir_r: (libc)Reading/Closing Directory.
* readlink: (libc)Symbolic Links.
* readv: (libc)Scatter-Gather.
* realloc: (libc)Changing Block Size.
* realpath: (libc)Symbolic Links.
* recv: (libc)Receiving Data.
* recvfrom: (libc)Receiving Datagrams.
* recvmsg: (libc)Receiving Datagrams.
* regcomp: (libc)POSIX Regexp Compilation.
* regerror: (libc)Regexp Cleanup.
* regexec: (libc)Matching POSIX Regexps.
* regfree: (libc)Regexp Cleanup.
* register_printf_function: (libc)Registering New Conversions.
* remainder: (libc)Remainder Functions.
* remainderf: (libc)Remainder Functions.
* remainderl: (libc)Remainder Functions.
* remove: (libc)Deleting Files.
* rename: (libc)Renaming Files.
* rewind: (libc)File Positioning.
* rewinddir: (libc)Random Access Directory.
* rindex: (libc)Search Functions.
* rint: (libc)Rounding Functions.
* rintf: (libc)Rounding Functions.
* rintl: (libc)Rounding Functions.
* rmdir: (libc)Deleting Files.
* round: (libc)Rounding Functions.
* roundf: (libc)Rounding Functions.
* roundl: (libc)Rounding Functions.
* rpmatch: (libc)Yes-or-No Questions.
* sbrk: (libc)Resizing the Data Segment.
* scalb: (libc)Normalization Functions.
* scalbf: (libc)Normalization Functions.
* scalbl: (libc)Normalization Functions.
* scalbln: (libc)Normalization Functions.
* scalblnf: (libc)Normalization Functions.
* scalblnl: (libc)Normalization Functions.
* scalbn: (libc)Normalization Functions.
* scalbnf: (libc)Normalization Functions.
* scalbnl: (libc)Normalization Functions.
* scandir64: (libc)Scanning Directory Content.
* scandir: (libc)Scanning Directory Content.
* scanf: (libc)Formatted Input Functions.
* sched_get_priority_max: (libc)Basic Scheduling Functions.
* sched_get_priority_min: (libc)Basic Scheduling Functions.
* sched_getaffinity: (libc)CPU Affinity.
* sched_getparam: (libc)Basic Scheduling Functions.
* sched_getscheduler: (libc)Basic Scheduling Functions.
* sched_rr_get_interval: (libc)Basic Scheduling Functions.
* sched_setaffinity: (libc)CPU Affinity.
* sched_setparam: (libc)Basic Scheduling Functions.
* sched_setscheduler: (libc)Basic Scheduling Functions.
* sched_yield: (libc)Basic Scheduling Functions.
* secure_getenv: (libc)Environment Access.
* seed48: (libc)SVID Random.
* seed48_r: (libc)SVID Random.
* seekdir: (libc)Random Access Directory.
* select: (libc)Waiting for I/O.
* send: (libc)Sending Data.
* sendmsg: (libc)Receiving Datagrams.
* sendto: (libc)Sending Datagrams.
* setbuf: (libc)Controlling Buffering.
* setbuffer: (libc)Controlling Buffering.
* setcontext: (libc)System V contexts.
* setdomainname: (libc)Host Identification.
* setegid: (libc)Setting Groups.
* setenv: (libc)Environment Access.
* seteuid: (libc)Setting User ID.
* setfsent: (libc)fstab.
* setgid: (libc)Setting Groups.
* setgrent: (libc)Scanning All Groups.
* setgroups: (libc)Setting Groups.
* sethostent: (libc)Host Names.
* sethostid: (libc)Host Identification.
* sethostname: (libc)Host Identification.
* setitimer: (libc)Setting an Alarm.
* setjmp: (libc)Non-Local Details.
* setkey: (libc)DES Encryption.
* setkey_r: (libc)DES Encryption.
* setlinebuf: (libc)Controlling Buffering.
* setlocale: (libc)Setting the Locale.
* setlogmask: (libc)setlogmask.
* setmntent: (libc)mtab.
* setnetent: (libc)Networks Database.
* setnetgrent: (libc)Lookup Netgroup.
* setpgid: (libc)Process Group Functions.
* setpgrp: (libc)Process Group Functions.
* setpriority: (libc)Traditional Scheduling Functions.
* setprotoent: (libc)Protocols Database.
* setpwent: (libc)Scanning All Users.
* setregid: (libc)Setting Groups.
* setreuid: (libc)Setting User ID.
* setrlimit64: (libc)Limits on Resources.
* setrlimit: (libc)Limits on Resources.
* setservent: (libc)Services Database.
* setsid: (libc)Process Group Functions.
* setsockopt: (libc)Socket Option Functions.
* setstate: (libc)BSD Random.
* setstate_r: (libc)BSD Random.
* settimeofday: (libc)High-Resolution Calendar.
* setuid: (libc)Setting User ID.
* setutent: (libc)Manipulating the Database.
* setutxent: (libc)XPG Functions.
* setvbuf: (libc)Controlling Buffering.
* shutdown: (libc)Closing a Socket.
* sigaction: (libc)Advanced Signal Handling.
* sigaddset: (libc)Signal Sets.
* sigaltstack: (libc)Signal Stack.
* sigblock: (libc)Blocking in BSD.
* sigdelset: (libc)Signal Sets.
* sigemptyset: (libc)Signal Sets.
* sigfillset: (libc)Signal Sets.
* siginterrupt: (libc)BSD Handler.
* sigismember: (libc)Signal Sets.
* siglongjmp: (libc)Non-Local Exits and Signals.
* sigmask: (libc)Blocking in BSD.
* signal: (libc)Basic Signal Handling.
* signbit: (libc)FP Bit Twiddling.
* significand: (libc)Normalization Functions.
* significandf: (libc)Normalization Functions.
* significandl: (libc)Normalization Functions.
* sigpause: (libc)Blocking in BSD.
* sigpending: (libc)Checking for Pending Signals.
* sigprocmask: (libc)Process Signal Mask.
* sigsetjmp: (libc)Non-Local Exits and Signals.
* sigsetmask: (libc)Blocking in BSD.
* sigstack: (libc)Signal Stack.
* sigsuspend: (libc)Sigsuspend.
* sigvec: (libc)BSD Handler.
* sin: (libc)Trig Functions.
* sincos: (libc)Trig Functions.
* sincosf: (libc)Trig Functions.
* sincosl: (libc)Trig Functions.
* sinf: (libc)Trig Functions.
* sinh: (libc)Hyperbolic Functions.
* sinhf: (libc)Hyperbolic Functions.
* sinhl: (libc)Hyperbolic Functions.
* sinl: (libc)Trig Functions.
* sleep: (libc)Sleeping.
* snprintf: (libc)Formatted Output Functions.
* socket: (libc)Creating a Socket.
* socketpair: (libc)Socket Pairs.
* sprintf: (libc)Formatted Output Functions.
* sqrt: (libc)Exponents and Logarithms.
* sqrtf: (libc)Exponents and Logarithms.
* sqrtl: (libc)Exponents and Logarithms.
* srand48: (libc)SVID Random.
* srand48_r: (libc)SVID Random.
* srand: (libc)ISO Random.
* srandom: (libc)BSD Random.
* srandom_r: (libc)BSD Random.
* sscanf: (libc)Formatted Input Functions.
* ssignal: (libc)Basic Signal Handling.
* stat64: (libc)Reading Attributes.
* stat: (libc)Reading Attributes.
* stime: (libc)Simple Calendar Time.
* stpcpy: (libc)Copying and Concatenation.
* stpncpy: (libc)Copying and Concatenation.
* strcasecmp: (libc)String/Array Comparison.
* strcasestr: (libc)Search Functions.
* strcat: (libc)Copying and Concatenation.
* strchr: (libc)Search Functions.
* strchrnul: (libc)Search Functions.
* strcmp: (libc)String/Array Comparison.
* strcoll: (libc)Collation Functions.
* strcpy: (libc)Copying and Concatenation.
* strcspn: (libc)Search Functions.
* strdup: (libc)Copying and Concatenation.
* strdupa: (libc)Copying and Concatenation.
* strerror: (libc)Error Messages.
* strerror_r: (libc)Error Messages.
* strfmon: (libc)Formatting Numbers.
* strfry: (libc)strfry.
* strftime: (libc)Formatting Calendar Time.
* strlen: (libc)String Length.
* strncasecmp: (libc)String/Array Comparison.
* strncat: (libc)Copying and Concatenation.
* strncmp: (libc)String/Array Comparison.
* strncpy: (libc)Copying and Concatenation.
* strndup: (libc)Copying and Concatenation.
* strndupa: (libc)Copying and Concatenation.
* strnlen: (libc)String Length.
* strpbrk: (libc)Search Functions.
* strptime: (libc)Low-Level Time String Parsing.
* strrchr: (libc)Search Functions.
* strsep: (libc)Finding Tokens in a String.
* strsignal: (libc)Signal Messages.
* strspn: (libc)Search Functions.
* strstr: (libc)Search Functions.
* strtod: (libc)Parsing of Floats.
* strtof: (libc)Parsing of Floats.
* strtoimax: (libc)Parsing of Integers.
* strtok: (libc)Finding Tokens in a String.
* strtok_r: (libc)Finding Tokens in a String.
* strtol: (libc)Parsing of Integers.
* strtold: (libc)Parsing of Floats.
* strtoll: (libc)Parsing of Integers.
* strtoq: (libc)Parsing of Integers.
* strtoul: (libc)Parsing of Integers.
* strtoull: (libc)Parsing of Integers.
* strtoumax: (libc)Parsing of Integers.
* strtouq: (libc)Parsing of Integers.
* strverscmp: (libc)String/Array Comparison.
* strxfrm: (libc)Collation Functions.
* stty: (libc)BSD Terminal Modes.
* swapcontext: (libc)System V contexts.
* swprintf: (libc)Formatted Output Functions.
* swscanf: (libc)Formatted Input Functions.
* symlink: (libc)Symbolic Links.
* sync: (libc)Synchronizing I/O.
* syscall: (libc)System Calls.
* sysconf: (libc)Sysconf Definition.
* sysctl: (libc)System Parameters.
* syslog: (libc)syslog; vsyslog.
* system: (libc)Running a Command.
* sysv_signal: (libc)Basic Signal Handling.
* tan: (libc)Trig Functions.
* tanf: (libc)Trig Functions.
* tanh: (libc)Hyperbolic Functions.
* tanhf: (libc)Hyperbolic Functions.
* tanhl: (libc)Hyperbolic Functions.
* tanl: (libc)Trig Functions.
* tcdrain: (libc)Line Control.
* tcflow: (libc)Line Control.
* tcflush: (libc)Line Control.
* tcgetattr: (libc)Mode Functions.
* tcgetpgrp: (libc)Terminal Access Functions.
* tcgetsid: (libc)Terminal Access Functions.
* tcsendbreak: (libc)Line Control.
* tcsetattr: (libc)Mode Functions.
* tcsetpgrp: (libc)Terminal Access Functions.
* tdelete: (libc)Tree Search Function.
* tdestroy: (libc)Tree Search Function.
* telldir: (libc)Random Access Directory.
* tempnam: (libc)Temporary Files.
* textdomain: (libc)Locating gettext catalog.
* tfind: (libc)Tree Search Function.
* tgamma: (libc)Special Functions.
* tgammaf: (libc)Special Functions.
* tgammal: (libc)Special Functions.
* time: (libc)Simple Calendar Time.
* timegm: (libc)Broken-down Time.
* timelocal: (libc)Broken-down Time.
* times: (libc)Processor Time.
* tmpfile64: (libc)Temporary Files.
* tmpfile: (libc)Temporary Files.
* tmpnam: (libc)Temporary Files.
* tmpnam_r: (libc)Temporary Files.
* toascii: (libc)Case Conversion.
* tolower: (libc)Case Conversion.
* toupper: (libc)Case Conversion.
* towctrans: (libc)Wide Character Case Conversion.
* towlower: (libc)Wide Character Case Conversion.
* towupper: (libc)Wide Character Case Conversion.
* trunc: (libc)Rounding Functions.
* truncate64: (libc)File Size.
* truncate: (libc)File Size.
* truncf: (libc)Rounding Functions.
* truncl: (libc)Rounding Functions.
* tsearch: (libc)Tree Search Function.
* ttyname: (libc)Is It a Terminal.
* ttyname_r: (libc)Is It a Terminal.
* twalk: (libc)Tree Search Function.
* tzset: (libc)Time Zone Functions.
* ulimit: (libc)Limits on Resources.
* umask: (libc)Setting Permissions.
* umount2: (libc)Mount-Unmount-Remount.
* umount: (libc)Mount-Unmount-Remount.
* uname: (libc)Platform Type.
* ungetc: (libc)How Unread.
* ungetwc: (libc)How Unread.
* unlink: (libc)Deleting Files.
* unlockpt: (libc)Allocation.
* unsetenv: (libc)Environment Access.
* updwtmp: (libc)Manipulating the Database.
* utime: (libc)File Times.
* utimes: (libc)File Times.
* utmpname: (libc)Manipulating the Database.
* utmpxname: (libc)XPG Functions.
* va_arg: (libc)Argument Macros.
* va_copy: (libc)Argument Macros.
* va_end: (libc)Argument Macros.
* va_start: (libc)Argument Macros.
* valloc: (libc)Aligned Memory Blocks.
* vasprintf: (libc)Variable Arguments Output.
* verr: (libc)Error Messages.
* verrx: (libc)Error Messages.
* versionsort64: (libc)Scanning Directory Content.
* versionsort: (libc)Scanning Directory Content.
* vfork: (libc)Creating a Process.
* vfprintf: (libc)Variable Arguments Output.
* vfscanf: (libc)Variable Arguments Input.
* vfwprintf: (libc)Variable Arguments Output.
* vfwscanf: (libc)Variable Arguments Input.
* vlimit: (libc)Limits on Resources.
* vprintf: (libc)Variable Arguments Output.
* vscanf: (libc)Variable Arguments Input.
* vsnprintf: (libc)Variable Arguments Output.
* vsprintf: (libc)Variable Arguments Output.
* vsscanf: (libc)Variable Arguments Input.
* vswprintf: (libc)Variable Arguments Output.
* vswscanf: (libc)Variable Arguments Input.
* vsyslog: (libc)syslog; vsyslog.
* vtimes: (libc)Resource Usage.
* vwarn: (libc)Error Messages.
* vwarnx: (libc)Error Messages.
* vwprintf: (libc)Variable Arguments Output.
* vwscanf: (libc)Variable Arguments Input.
* wait3: (libc)BSD Wait Functions.
* wait4: (libc)Process Completion.
* wait: (libc)Process Completion.
* waitpid: (libc)Process Completion.
* warn: (libc)Error Messages.
* warnx: (libc)Error Messages.
* wcpcpy: (libc)Copying and Concatenation.
* wcpncpy: (libc)Copying and Concatenation.
* wcrtomb: (libc)Converting a Character.
* wcscasecmp: (libc)String/Array Comparison.
* wcscat: (libc)Copying and Concatenation.
* wcschr: (libc)Search Functions.
* wcschrnul: (libc)Search Functions.
* wcscmp: (libc)String/Array Comparison.
* wcscoll: (libc)Collation Functions.
* wcscpy: (libc)Copying and Concatenation.
* wcscspn: (libc)Search Functions.
* wcsdup: (libc)Copying and Concatenation.
* wcsftime: (libc)Formatting Calendar Time.
* wcslen: (libc)String Length.
* wcsncasecmp: (libc)String/Array Comparison.
* wcsncat: (libc)Copying and Concatenation.
* wcsncmp: (libc)String/Array Comparison.
* wcsncpy: (libc)Copying and Concatenation.
* wcsnlen: (libc)String Length.
* wcsnrtombs: (libc)Converting Strings.
* wcspbrk: (libc)Search Functions.
* wcsrchr: (libc)Search Functions.
* wcsrtombs: (libc)Converting Strings.
* wcsspn: (libc)Search Functions.
* wcsstr: (libc)Search Functions.
* wcstod: (libc)Parsing of Floats.
* wcstof: (libc)Parsing of Floats.
* wcstoimax: (libc)Parsing of Integers.
* wcstok: (libc)Finding Tokens in a String.
* wcstol: (libc)Parsing of Integers.
* wcstold: (libc)Parsing of Floats.
* wcstoll: (libc)Parsing of Integers.
* wcstombs: (libc)Non-reentrant String Conversion.
* wcstoq: (libc)Parsing of Integers.
* wcstoul: (libc)Parsing of Integers.
* wcstoull: (libc)Parsing of Integers.
* wcstoumax: (libc)Parsing of Integers.
* wcstouq: (libc)Parsing of Integers.
* wcswcs: (libc)Search Functions.
* wcsxfrm: (libc)Collation Functions.
* wctob: (libc)Converting a Character.
* wctomb: (libc)Non-reentrant Character Conversion.
* wctrans: (libc)Wide Character Case Conversion.
* wctype: (libc)Classification of Wide Characters.
* wmemchr: (libc)Search Functions.
* wmemcmp: (libc)String/Array Comparison.
* wmemcpy: (libc)Copying and Concatenation.
* wmemmove: (libc)Copying and Concatenation.
* wmempcpy: (libc)Copying and Concatenation.
* wmemset: (libc)Copying and Concatenation.
* wordexp: (libc)Calling Wordexp.
* wordfree: (libc)Calling Wordexp.
* wprintf: (libc)Formatted Output Functions.
* write: (libc)I/O Primitives.
* writev: (libc)Scatter-Gather.
* wscanf: (libc)Formatted Input Functions.
* y0: (libc)Special Functions.
* y0f: (libc)Special Functions.
* y0l: (libc)Special Functions.
* y1: (libc)Special Functions.
* y1f: (libc)Special Functions.
* y1l: (libc)Special Functions.
* yn: (libc)Special Functions.
* ynf: (libc)Special Functions.
* ynl: (libc)Special Functions.
END-INFO-DIR-ENTRY
This file documents the GNU C Library.
This is `The GNU C Library Reference Manual', for version
2.18-2013.10 (EGLIBC).
Copyright (C) 1993-2013 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version
1.3 or any later version published by the Free Software Foundation;
with the Invariant Sections being "Free Software Needs Free
Documentation" and "GNU Lesser General Public License", the Front-Cover
texts being "A GNU Manual", and with the Back-Cover Texts as in (a)
below. A copy of the license is included in the section entitled "GNU
Free Documentation License".
(a) The FSF's Back-Cover Text is: "You have the freedom to copy and
modify this GNU manual. Buying copies from the FSF supports it in
developing GNU and promoting software freedom."

File: libc.info, Node: Errors in Math Functions, Next: Pseudo-Random Numbers, Prev: Special Functions, Up: Mathematics
19.7 Known Maximum Errors in Math Functions
===========================================
This section lists the known errors of the functions in the math
library. Errors are measured in "units of the last place". This is a
measure for the relative error. For a number z with the representation
d.d...d*2^e (we assume IEEE floating-point numbers with base 2) the ULP
is represented by
|d.d...d - (z / 2^e)| / 2^(p - 1)
where p is the number of bits in the mantissa of the floating-point
number representation. Ideally the error for all functions is always
less than 0.5ulps. Using rounding bits this is also possible and
normally implemented for the basic operations. To achieve the same for
the complex math functions requires a lot more work and this has not
yet been done.
Therefore many of the functions in the math library have errors. The
table lists the maximum error for each function which is exposed by one
of the existing tests in the test suite. The table tries to cover as
much as possible and list the actual maximum error (or at least a
ballpark figure) but this is often not achieved due to the large search
space.
The table lists the ULP values for different architectures.
Different architectures have different results since their hardware
support for floating-point operations varies and also the existing
hardware support is different.
Function aarch64 Alpha ARM hppa/fpu IA64
acosf - - - - -
acos - - - - -
acosl - - - - -
acoshf - - - - -
acosh - - - - -
acoshl - - - - -
asinf - - - - -
asin - - - - -
asinl - - - - -
asinhf - - - - -
asinh - - - - -
asinhl - - - - -
atanf - - - - -
atan - - - - -
atanl - - - - -
atanhf 1 1 1 1 -
atanh - - - - -
atanhl - - - - -
atan2f 1 1 1 1 -
atan2 - - - - -
atan2l 1 1 - - -
cabsf - - - - -
cabs - - - - -
cabsl - - - - -
cacosf 2 + i 2 2 + i 2 2 + i 2 2 + i 2 0 + i 1
cacos 1 + i 2 1 + i 1 1 + i 1 1 + i 1 -
cacosl 2 + i 2 2 + i 2 - - 0 + i 2
cacoshf 2 + i 2 2 + i 2 2 + i 2 2 + i 2 7 + i 0
cacosh 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
cacoshl 2 + i 2 2 + i 2 - - 7 + i 1
cargf - - - - -
carg - - - - -
cargl - - - - -
casinf 1 + i 2 1 + i 2 1 + i 2 1 + i 2 1 + i 1
casin 1 + i 2 1 + i 1 1 + i 1 1 + i 1 1 + i 0
casinl 2 + i 2 2 + i 2 - 1 + i 0 2 + i 2
casinhf 2 + i 1 2 + i 1 2 + i 1 2 + i 1 1 + i 6
casinh 5 + i 3 1 + i 1 1 + i 1 5 + i 3 5 + i 3
casinhl 4 + i 2 2 + i 2 - 5 + i 3 5 + i 5
catanf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 0 + i 1
catan 0 + i 1 0 + i 1 0 + i 1 0 + i 1 0 + i 1
catanl 1 + i 1 1 + i 1 - 0 + i 1 -
catanhf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 -
catanh 4 + i 0 1 + i 0 1 + i 0 4 + i 0 4 + i 0
catanhl 1 + i 1 1 + i 1 - 4 + i 0 1 + i 0
cbrtf - - - - -
cbrt 1 1 1 1 -
cbrtl 1 1 - 1 -
ccosf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 0 + i 1
ccos 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 0
ccosl 1 + i 1 1 + i 1 - 1 + i 0 1 + i 1
ccoshf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccosh 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccoshl 1 + i 1 1 + i 1 - 1 + i 0 0 + i 1
ceilf - - - - -
ceil - - - - -
ceill - - - - -
cexpf 1 + i 2 1 + i 2 1 + i 2 1 + i 2 1 + i 1
cexp 2 + i 1 2 + i 1 2 + i 1 2 + i 1 -
cexpl 1 + i 1 1 + i 1 - - 0 + i 1
cimagf - - - - -
cimag - - - - -
cimagl - - - - -
clogf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 0
clog 1 + i 1 1 + i 0 1 + i 0 1 + i 0 -
clogl 1 + i 1 1 + i 1 - - 1 + i 0
clog10f 2 + i 1 2 + i 1 2 + i 1 2 + i 1 1 + i 1
clog10 2 + i 1 2 + i 1 2 + i 1 2 + i 1 1 + i 1
clog10l 1 + i 2 1 + i 2 - 0 + i 1 1 + i 1
conjf - - - - -
conj - - - - -
conjl - - - - -
copysignf - - - - -
copysign - - - - -
copysignl - - - - -
cosf 1 1 1 1 1
cos 2 2 2 2 2
cosl 1 1 - 2 1
coshf - - - - -
cosh - - - - -
coshl - - - - -
cpowf 5 + i 2 4 + i 2 4 + i 2 4 + i 2 5 + i 3
cpow 2 + i 2 2 + i 0 2 + i 0 2 + i 2 2 + i 2
cpowl 4 + i 1 4 + i 1 - 2 + i 2 6 + i 4
cprojf - - - - -
cproj - - - - -
cprojl - - - - -
crealf - - - - -
creal - - - - -
creall - - - - -
csinf 1 + i 0 1 + i 0 1 + i 0 1 + i 0 1 + i 1
csin 1 + i 0 1 + i 0 1 + i 0 1 + i 0 -
csinl 1 + i 1 1 + i 1 - - 1 + i 0
csinhf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
csinh 0 + i 1 0 + i 1 0 + i 1 0 + i 1 1 + i 1
csinhl 1 + i 1 1 + i 1 - 0 + i 1 1 + i 2
csqrtf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 0
csqrt 1 + i 1 1 + i 1 1 + i 1 1 + i 1 -
csqrtl 1 + i 1 1 + i 1 - - -
ctanf 1 + i 1 1 + i 0 1 + i 0 1 + i 0 0 + i 1
ctan 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ctanl 2 + i 2 2 + i 2 - 0 + i 1 2 + i 1
ctanhf 2 + i 1 1 + i 2 1 + i 2 1 + i 2 0 + i 1
ctanh 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ctanhl 2 + i 2 2 + i 2 - 1 + i 0 1 + i 24
erff - - - - -
erf 1 1 1 1 1
erfl - - - 1 -
erfcf 1 1 1 1 1
erfc 1 1 1 1 1
erfcl 1 1 - 1 1
expf - - - - -
exp - - - - -
expl - - - - -
exp10f - - - 2 2
exp10 1 1 1 6 6
exp10l 1 1 - 6 3
exp2f - - - - -
exp2 - - - - -
exp2l 1 1 - - -
expm1f 1 1 1 1 -
expm1 1 1 1 1 -
expm1l 1 1 - 1 1
fabsf - - - - -
fabs - - - - -
fabsl - - - - -
fdimf - - - - -
fdim - - - - -
fdiml - - - - -
floorf - - - - -
floor - - - - -
floorl - - - - -
fmaf - - - - -
fma - - - - -
fmal - - - - -
fmaxf - - - - -
fmax - - - - -
fmaxl - - - - -
fminf - - - - -
fmin - - - - -
fminl - - - - -
fmodf - - - - -
fmod - - - - -
fmodl - - - - -
frexpf - - - - -
frexp - - - - -
frexpl - - - - -
gammaf 2 2 2 2 -
gamma 1 1 1 1 -
gammal 1 1 - - 1
hypotf 1 1 1 1 1
hypot - - - - -
hypotl - - - - -
ilogbf - - - - -
ilogb - - - - -
ilogbl - - - - -
j0f 2 2 2 2 2
j0 2 2 2 2 3
j0l 2 2 - 2 2
j1f 2 2 2 2 2
j1 1 1 1 1 1
j1l 4 4 - 1 1
jnf 5 5 5 5 4
jn 4 4 4 4 3
jnl 8 8 - 4 2
lgammaf 2 2 2 2 2
lgamma 1 1 1 1 1
lgammal 1 1 - 1 1
lrintf - - - - -
lrint - - - - -
lrintl - - - - -
llrintf - - - - -
llrint - - - - -
llrintl - - - - -
logf - - - - 1
log - - - - -
logl - - - - -
log10f 2 2 2 2 1
log10 1 1 1 1 -
log10l 1 1 - 1 1
log1pf - 1 1 1 -
log1p - - - - -
log1pl 1 1 - - -
log2f - - - - -
log2 - - - - -
log2l 1 1 - - -
logbf - - - - -
logb - - - - -
logbl - - - - -
lroundf - - - - -
lround - - - - -
lroundl - - - - -
llroundf - - - - -
llround - - - - -
llroundl - - - - -
modff - - - - -
modf - - - - -
modfl - - - - -
nearbyintf - - - - -
nearbyint - - - - -
nearbyintl - - - - -
nextafterf - - - - -
nextafter - - - - -
nextafterl - - - - -
nexttowardf - - - - -
nexttoward - - - - -
nexttowardl - - - - -
powf 1 1 1 1 -
pow - - - - -
powl 1 1 - - -
remainderf - - - - -
remainder - - - - -
remainderl - - - - -
remquof - - - - -
remquo - - - - -
remquol - - - - -
rintf - - - - -
rint - - - - -
rintl - - - - -
roundf - - - - -
round - - - - -
roundl - - - - -
scalbf - - - - -
scalb - - - - -
scalbl - - - - -
scalbnf - - - - -
scalbn - - - - -
scalbnl - - - - -
scalblnf - - - - -
scalbln - - - - -
scalblnl - - - - -
sinf - - - - -
sin - - - - -
sinl - - - - -
sincosf 1 1 1 1 1
sincos 1 1 1 1 1
sincosl 1 1 - 1 1
sinhf - - - - -
sinh - - - - -
sinhl - - - - -
sqrtf - - - - -
sqrt - - - - -
sqrtl - - - - -
tanf - - - - -
tan 1 1 1 1 1
tanl - - - 1 -
tanhf - - - - -
tanh - - - - -
tanhl 1 1 - - -
tgammaf 3 3 3 3 1
tgamma 4 4 4 4 1
tgammal 4 4 - 1 1
truncf - - - - -
trunc - - - - -
truncl - - - - -
y0f 1 1 1 1 1
y0 2 2 2 2 2
y0l 3 3 - 2 1
y1f 2 2 2 2 2
y1 3 3 3 3 3
y1l 2 2 - 3 1
ynf 2 2 2 2 2
yn 3 3 3 3 3
ynl 5 5 - 3 2
Function m68k/coldfire/fpum68k/m680x0/fpu microblaze mips/mips32 mips/mips64
acosf - - - - -
acos - - - - -
acosl - - - - -
acoshf - - - - -
acosh - 1 - - -
acoshl - 1 - - -
asinf - - - - -
asin - - - - -
asinl - - - - -
asinhf - - - - -
asinh - - - - -
asinhl - 1 - - -
atanf - - - - -
atan - - - - -
atanl - - - - -
atanhf 1 - 1 1 1
atanh - - - - -
atanhl - 1 - - -
atan2f 1 - 1 1 1
atan2 - - - - -
atan2l - 1 - - 1
cabsf - - - - -
cabs - - - - -
cabsl - - - - -
cacosf - 2 + i 1 1 + i 1 2 + i 2 2 + i 2
cacos - 1 + i 2 1 + i 1 1 + i 1 1 + i 1
cacosl - 1 + i 2 - - 2 + i 2
cacoshf 0 + i 1 1 + i 2 1 + i 1 2 + i 2 2 + i 2
cacosh - 1 + i 1 1 + i 1 1 + i 1 1 + i 1
cacoshl - 6 + i 2 - - 2 + i 2
cargf - - - - -
carg - - - - -
cargl - - - - -
casinf 1 + i 0 5 + i 1 1 + i 1 1 + i 2 1 + i 2
casin 1 + i 0 1 + i 2 1 + i 1 1 + i 1 1 + i 1
casinl - 3 + i 2 - - 2 + i 2
casinhf 1 + i 6 1 + i 6 1 + i 1 2 + i 1 2 + i 1
casinh 5 + i 3 6 + i 13 1 + i 1 1 + i 1 1 + i 1
casinhl - 5 + i 6 - - 2 + i 2
catanf 0 + i 1 0 + i 1 0 + i 1 1 + i 1 1 + i 1
catan 0 + i 1 0 + i 1 0 + i 1 0 + i 1 0 + i 1
catanl - 1 + i 1 - - 1 + i 1
catanhf - 1 + i 0 - 1 + i 1 1 + i 1
catanh 4 + i 0 1 + i 0 4 + i 0 1 + i 0 1 + i 0
catanhl - 1 + i 1 - - 1 + i 1
cbrtf - - - - -
cbrt 1 - 1 1 1
cbrtl - 1 - - 1
ccosf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccos 1 + i 0 - 1 + i 1 1 + i 1 1 + i 1
ccosl - 1 + i 1 - - 1 + i 1
ccoshf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccosh 1 + i 0 - 1 + i 1 1 + i 1 1 + i 1
ccoshl - 0 + i 1 - - 1 + i 1
ceilf - - - - -
ceil - - - - -
ceill - - - - -
cexpf 1 + i 1 2 + i 1 1 + i 2 1 + i 2 1 + i 2
cexp - - 2 + i 1 2 + i 1 2 + i 1
cexpl - 1 + i 1 - - 1 + i 1
cimagf - - - - -
cimag - - - - -
cimagl - - - - -
clogf 1 + i 0 1 + i 0 1 + i 1 1 + i 1 1 + i 1
clog - 1 + i 0 1 + i 0 1 + i 0 1 + i 0
clogl - 1 + i 1 - - 1 + i 1
clog10f 1 + i 1 1 + i 1 2 + i 1 2 + i 1 2 + i 1
clog10 0 + i 1 1 + i 1 2 + i 1 2 + i 1 2 + i 1
clog10l - 1 + i 2 - - 1 + i 2
conjf - - - - -
conj - - - - -
conjl - - - - -
copysignf - - - - -
copysign - - - - -
copysignl - - - - -
cosf 1 1 1 1 1
cos 2 2 2 2 2
cosl - 1 - - 1
coshf - - - - -
cosh - - - - -
coshl - - - - -
cpowf 4 + i 2 3 + i 5 4 + i 2 4 + i 2 4 + i 2
cpow 2 + i 2 1 + i 2 2 + i 2 2 + i 0 2 + i 0
cpowl - 15 + i 2 - - 4 + i 1
cprojf - - - - -
cproj - - - - -
cprojl - - - - -
crealf - - - - -
creal - - - - -
creall - - - - -
csinf - 1 + i 1 1 + i 0 1 + i 0 1 + i 0
csin - - 1 + i 0 1 + i 0 1 + i 0
csinl - 1 + i 0 - - 1 + i 1
csinhf 1 + i 1 1 + i 1 1 + i 1 1 + i 1 1 + i 1
csinh 0 + i 1 - 0 + i 1 0 + i 1 0 + i 1
csinhl - 1 + i 0 - - 1 + i 1
csqrtf 1 + i 0 - 1 + i 1 1 + i 1 1 + i 1
csqrt - 1 + i 1 1 + i 1 1 + i 1 1 + i 1
csqrtl - 1 + i 1 - - 1 + i 1
ctanf - 1 + i 1 1 + i 0 1 + i 0 1 + i 0
ctan 0 + i 1 1 + i 0 1 + i 1 1 + i 1 1 + i 1
ctanl - 2 + i 1 - - 2 + i 2
ctanhf 2 + i 1 1 + i 2 1 + i 2 1 + i 2 1 + i 2
ctanh 1 + i 0 0 + i 1 1 + i 1 1 + i 1 1 + i 1
ctanhl - 1 + i 2 - - 2 + i 2
erff - - - - -
erf 1 - 1 1 1
erfl - - - - -
erfcf - 1 1 1 1
erfc 1 - 1 1 1
erfcl - 1 - - 1
expf - - - - -
exp - - - - -
expl - - - - -
exp10f 2 - - - -
exp10 6 - 1 1 1
exp10l - - - - 1
exp2f - - - - -
exp2 - - - - -
exp2l - - - - 1
expm1f 1 - 1 1 1
expm1 1 - 1 1 1
expm1l - 1 - - 1
fabsf - - - - -
fabs - - - - -
fabsl - - - - -
fdimf - - - - -
fdim - - - - -
fdiml - - - - -
floorf - - - - -
floor - - - - -
floorl - - - - -
fmaf - - 1 - -
fma - - 1 - -
fmal - - - - -
fmaxf - - - - -
fmax - - - - -
fmaxl - - - - -
fminf - - - - -
fmin - - - - -
fminl - - - - -
fmodf - - - - -
fmod - - - - -
fmodl - - - - -
frexpf - - - - -
frexp - - - - -
frexpl - - - - -
gammaf - 2 - 2 2
gamma - 1 - 1 1
gammal - 1 - - 1
hypotf 1 1 1 1 1
hypot - - - - -
hypotl - 1 - - -
ilogbf - - - - -
ilogb - - - - -
ilogbl - - - - -
j0f 2 2 2 2 2
j0 2 1 2 2 2
j0l - 2 - - 2
j1f 2 2 2 2 2
j1 1 - 1 1 1
j1l - 1 - - 4
jnf 4 5 5 5 5
jn 4 1 4 4 4
jnl - 3 - - 8
lgammaf 2 2 2 2 2
lgamma 1 1 1 1 1
lgammal - 1 - - 1
lrintf - - - - -
lrint - - - - -
lrintl - - - - -
llrintf - - - - -
llrint - - - - -
llrintl - - - - -
logf - 1 - - -
log - - - - -
logl - 1 - - -
log10f 2 1 2 2 2
log10 1 - 1 1 1
log10l - 2 - - 1
log1pf 1 - 1 1 1
log1p - - - - -
log1pl - 1 - - 1
log2f - - - - -
log2 - - - - -
log2l - 1 - - 1
logbf - - - - -
logb - - - - -
logbl - - - - -
lroundf - - - - -
lround - - - - -
lroundl - - - - -
llroundf - - - - -
llround - - - - -
llroundl - - - - -
modff - - - - -
modf - - - - -
modfl - - - - -
nearbyintf - - - - -
nearbyint - - - - -
nearbyintl - - - - -
nextafterf - - - - -
nextafter - - - - -
nextafterl - - - - -
nexttowardf - - - - -
nexttoward - - - - -
nexttowardl - - - - -
powf - 1 1 1 1
pow - - - - -
powl - 7 - - 1
remainderf - - - - -
remainder - - - - -
remainderl - - - - -
remquof - - - - -
remquo - - - - -
remquol - - - - -
rintf - - - - -
rint - - - - -
rintl - - - - -
roundf - - - - -
round - - - - -
roundl - - - - -
scalbf - - - - -
scalb - - - - -
scalbl - - - - -
scalbnf - - - - -
scalbn - - - - -
scalbnl - - - - -
scalblnf - - - - -
scalbln - - - - -
scalblnl - - - - -
sinf - - - - -
sin - - - - -
sinl - - - - -
sincosf 1 1 1 1 1
sincos 1 1 1 1 1
sincosl - 1 - - 1
sinhf - - - - -
sinh - - - - -
sinhl - 1 - - -
sqrtf - - - - -
sqrt - - - - -
sqrtl - - - - -
tanf - - - - -
tan 1 1 1 1 1
tanl - 1 - - -
tanhf - - - - -
tanh - - - - -
tanhl - - - - 1
tgammaf 1 3 1 3 3
tgamma 1 4 1 4 4
tgammal - 4 - - 4
truncf - - - - -
trunc - - - - -
truncl - - - - -
y0f 1 1 1 1 1
y0 2 1 2 2 2
y0l - 2 - - 3
y1f 2 2 2 2 2
y1 3 1 3 3 3
y1l - 2 - - 2
ynf 2 2 2 2 2
yn 3 1 3 3 3
ynl - 4 - - 5
Function powerpc/nofpu tile Generic ix86 PowerPC
acosf - - - - -
acos - - - - -
acosl 1 - - 1 1
acoshf - - - - -
acosh - - - - -
acoshl 1 - - - 1
asinf - - - - -
asin - - - - -
asinl 2 - - - 2
asinhf - - - - -
asinh - - - - -
asinhl 1 - - - 1
atanf - - - - -
atan - - - - -
atanl - - - - -
atanhf 1 1 - - 1
atanh - - - - -
atanhl - - - 1 -
atan2f 1 1 - - 1
atan2 - - - - -
atan2l 1 - - - 1
cabsf - - - - 1
cabs - - - - -
cabsl 1 - - - 1
cacosf 2 + i 2 2 + i 2 - 1 + i 1 2 + i 2
cacos 1 + i 1 1 + i 1 - 1 + i 1 1 + i 3
cacosl 2 + i 2 - - 1 + i 2 -
cacoshf 2 + i 2 2 + i 2 - 1 + i 1 7 + i 3
cacosh 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
cacoshl 2 + i 2 - - 2 + i 1 -
cargf - - - - -
carg - - - - -
cargl 1 - - - 1
casinf 1 + i 2 1 + i 2 - 1 + i 1 1 + i 2
casin 1 + i 1 1 + i 1 - 1 + i 1 1 + i 3
casinl 2 + i 2 - - 1 + i 2 1 + i 0
casinhf 2 + i 1 2 + i 1 - 1 + i 1 2 + i 1
casinh 1 + i 1 1 + i 1 - 1 + i 1 5 + i 3
casinhl 2 + i 2 - - 2 + i 1 0 + i 1
catanf 1 + i 1 1 + i 1 - 0 + i 1 4 + i 1
catan 0 + i 1 0 + i 1 - 0 + i 1 0 + i 1
catanl 1 + i 1 - - 0 + i 1 1 + i 1
catanhf 1 + i 1 1 + i 1 - 1 + i 0 1 + i 1
catanh 1 + i 0 1 + i 0 - 1 + i 0 4 + i 0
catanhl 1 + i 1 - - 1 + i 0 1 + i 1
cbrtf - - - - -
cbrt 1 1 - - 1
cbrtl 1 - - 1 1
ccosf 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ccos 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ccosl 1 + i 2 - - 1 + i 1 1 + i 1
ccoshf 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ccosh 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ccoshl 1 + i 2 - - 0 + i 1 1 + i 2
ceilf - - - - -
ceil - - - - -
ceill - - - - -
cexpf 1 + i 2 1 + i 2 - 1 + i 1 1 + i 2
cexp 2 + i 1 2 + i 1 - 1 + i 1 2 + i 1
cexpl 2 + i 2 - - 1 + i 1 2 + i 2
cimagf - - - - -
cimag - - - - -
cimagl - - - - -
clogf 1 + i 1 1 + i 1 - 1 + i 0 2 + i 3
clog 1 + i 0 1 + i 0 - 1 + i 0 1 + i 1
clogl 1 + i 2 - - 1 + i 0 1 + i 2
clog10f 2 + i 1 2 + i 1 - 1 + i 1 2 + i 1
clog10 2 + i 1 2 + i 1 - 1 + i 1 2 + i 1
clog10l 2 + i 2 - - 1 + i 1 2 + i 2
conjf - - - - -
conj - - - - -
conjl - - - - -
copysignf - - - - -
copysign - - - - -
copysignl - - - - -
cosf 1 1 - 1 1
cos 2 2 - 2 2
cosl 2 - - 1 2
coshf - - - - -
cosh - - - - -
coshl 1 - - - 1
cpowf 4 + i 2 4 + i 2 - 5 + i 1 5 + i 2
cpow 2 + i 0 2 + i 0 - 2 + i 1 2 + i 2
cpowl 4 + i 1 - - 3 + i 4 4 + i 2
cprojf - - - - -
cproj - - - - -
cprojl - - - - 0 + i 1
crealf - - - - -
creal - - - - -
creall - - - - -
csinf 1 + i 0 1 + i 0 - 1 + i 1 1 + i 0
csin 1 + i 0 1 + i 0 - 1 + i 1 1 + i 0
csinl 2 + i 1 - - 1 + i 0 1 + i 1
csinhf 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
csinh 0 + i 1 0 + i 1 - 1 + i 1 0 + i 1
csinhl 1 + i 2 - - 1 + i 0 1 + i 1
csqrtf 1 + i 1 1 + i 1 - - 2 + i 2
csqrt 1 + i 1 1 + i 1 - - 1 + i 1
csqrtl 1 + i 1 - - 1 + i 1 1 + i 1
ctanf 1 + i 0 1 + i 0 - 1 + i 0 1 + i 1
ctan 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ctanl 2 + i 2 - - 2 + i 1 2 + i 2
ctanhf 1 + i 2 1 + i 2 - 1 + i 1 2 + i 1
ctanh 1 + i 1 1 + i 1 - 1 + i 1 1 + i 1
ctanhl 2 + i 2 - - 1 + i 2 2 + i 2
erff - - - - -
erf 1 1 - 1 1
erfl 1 - - - 1
erfcf 1 1 - - 1
erfc 1 1 - 1 1
erfcl 1 - - 1 1
expf - - - - -
exp - - - - -
expl 1 - - - 1
exp10f - - - - 1
exp10 1 1 - - 1
exp10l 1 - - 1 1
exp2f - - - - -
exp2 - - - - -
exp2l - - - - 2
expm1f 1 1 - - 1
expm1 1 1 - - 1
expm1l 1 - - 1 1
fabsf - - - - -
fabs - - - - -
fabsl - - - - -
fdimf - - - - -
fdim - - - - -
fdiml - - - - -
floorf - - - - -
floor - - - - -
floorl - - - - -
fmaf - - - - -
fma - - - - -
fmal - - - - -
fmaxf - - - - -
fmax - - - - -
fmaxl - - - - -
fminf - - - - -
fmin - - - - -
fminl - - - - -
fmodf - - - - -
fmod - - - - -
fmodl - - - - -
frexpf - - - - -
frexp - - - - -
frexpl - - - - -
gammaf 2 2 - 2 2
gamma 1 1 - 1 1
gammal 3 - - 1 3
hypotf 1 1 - 1 1
hypot - - - - 1
hypotl 1 - - - 1
ilogbf - - - - -
ilogb - - - - -
ilogbl - - - - -
j0f 2 2 - 1 2
j0 2 2 - 1 3
j0l 2 - - 2 2
j1f 2 2 - 1 2
j1 1 1 - 2 1
j1l 1 - - 1 1
jnf 5 5 - 4 5
jn 4 4 - 2 4
jnl 7 - - 3 7
lgammaf 2 2 - 2 2
lgamma 1 1 - 1 1
lgammal 3 - - 1 3
lrintf - - - - -
lrint - - - - -
lrintl - - - - -
llrintf - - - - -
llrint - - - - -
llrintl - - - - -
logf - - - 1 -
log - - - - -
logl 1 - - - 1
log10f 2 2 - 1 2
log10 1 1 - - 1
log10l 1 - - 1 1
log1pf 1 1 - - 1
log1p - - - - -
log1pl - - - - 1
log2f - - - - -
log2 - - - - -
log2l 1 - - - 1
logbf - - - - -
logb - - - - -
logbl - - - - -
lroundf - - - - -
lround - - - - -
lroundl - - - - -
llroundf - - - - -
llround - - - - -
llroundl - - - - -
modff - - - - -
modf - - - - -
modfl - - - - -
nearbyintf - - - - -
nearbyint - - - - -
nearbyintl - - - - -
nextafterf - - - - -
nextafter - - - - -
nextafterl - - - - -
nexttowardf - - - - -
nexttoward - - - - -
nexttowardl - - - - -
powf 1 1 - - 1
pow - - - - -
powl 1 - - 1 1
remainderf - - - - -
remainder - - - - -
remainderl - - - - -
remquof - - - - -
remquo - - - - -
remquol - - - - -
rintf - - - - -
rint - - - - -
rintl - - - - -
roundf - - - - -
round - - - - -
roundl - - - - -
scalbf - - - - -
scalb - - - - -
scalbl - - - - -
scalbnf - - - - -
scalbn - - - - -
scalbnl - - - - -
scalblnf - - - - -
scalbln - - - - -
scalblnl - - - - -
sinf - - - - -
sin - - - - -
sinl 1 - - - 1
sincosf 1 1 - 1 1
sincos 1 1 - 1 1
sincosl 1 - - 1 1
sinhf - - - - -
sinh - - - - -
sinhl 1 - - 1 1
sqrtf - - - - -
sqrt - - - - 1
sqrtl - - - - -
tanf - - - 1 -
tan 1 1 - 1 1
tanl 2 - - 1 2
tanhf - - - - -
tanh - - - - -
tanhl 1 - - - 1
tgammaf 3 3 - 2 3
tgamma 4 4 - 4 4
tgammal 3 - - 4 3
truncf - - - - -
trunc - - - - -
truncl - - - - -
y0f 1 1 - 1 1
y0 2 2 - 1 2
y0l 1 - - 1 1
y1f 2 2 - 2 2
y1 3 3 - 2 3
y1l 2 - - 2 2
ynf 2 2 - 3 2
yn 3 3 - 2 3
ynl 2 - - 4 2
Function S/390 SH4 sparc/fpu x86_64/fpu
acosf - - - -
acos - - - -
acosl - - - 1
acoshf - - - -
acosh - - - -
acoshl - - - -
asinf - 2 - -
asin - 1 - -
asinl - - - -
asinhf - - - -
asinh - - - -
asinhl - - - -
atanf - - - -
atan - - - -
atanl - - - -
atanhf 1 - 1 1
atanh - 1 - -
atanhl - - - 1
atan2f 1 4 1 1
atan2 - - - -
atan2l 1 - 1 -
cabsf - 1 - -
cabs - 1 - -
cabsl - - - -
cacosf 2 + i 2 1 + i 1 2 + i 2 2 + i 2
cacos 1 + i 1 1 + i 0 1 + i 1 1 + i 1
cacosl 2 + i 2 - 2 + i 2 1 + i 2
cacoshf 2 + i 2 7 + i 3 2 + i 2 2 + i 2
cacosh 1 + i 1 1 + i 1 1 + i 1 1 + i 1
cacoshl 2 + i 2 - 2 + i 2 2 + i 1
cargf - - - -
carg - - - -
cargl - - - -
casinf 1 + i 2 2 + i 1 1 + i 2 1 + i 2
casin 1 + i 1 3 + i 0 1 + i 1 1 + i 1
casinl 2 + i 2 - 2 + i 2 1 + i 2
casinhf 2 + i 1 1 + i 6 2 + i 1 2 + i 1
casinh 1 + i 1 5 + i 3 1 + i 1 1 + i 1
casinhl 2 + i 2 - 2 + i 2 2 + i 1
catanf 1 + i 1 4 + i 1 1 + i 1 1 + i 1
catan 0 + i 1 0 + i 1 0 + i 1 0 + i 1
catanl 1 + i 1 - 1 + i 1 0 + i 1
catanhf 1 + i 1 1 + i 6 1 + i 1 1 + i 1
catanh 1 + i 0 4 + i 1 1 + i 0 1 + i 0
catanhl 1 + i 1 - 1 + i 1 1 + i 0
cbrtf - - - -
cbrt 1 1 1 1
cbrtl 1 - 1 1
ccosf 1 + i 1 0 + i 1 1 + i 1 1 + i 1
ccos 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccosl 1 + i 1 - 1 + i 1 1 + i 1
ccoshf 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccosh 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ccoshl 1 + i 1 - 1 + i 1 0 + i 1
ceilf - - - -
ceil - - - -
ceill - - - -
cexpf 1 + i 2 1 + i 1 1 + i 2 1 + i 2
cexp 2 + i 1 1 + i 0 2 + i 1 2 + i 1
cexpl 1 + i 1 - 1 + i 1 1 + i 1
cimagf - - - -
cimag - - - -
cimagl - - - -
clogf 1 + i 1 0 + i 3 1 + i 1 1 + i 1
clog 1 + i 1 0 + i 1 1 + i 0 1 + i 0
clogl 1 + i 1 - 1 + i 1 1 + i 1
clog10f 2 + i 1 1 + i 5 2 + i 1 2 + i 1
clog10 2 + i 1 1 + i 1 2 + i 1 2 + i 1
clog10l 1 + i 2 - 1 + i 2 1 + i 1
conjf - - - -
conj - - - -
conjl - - - -
copysignf - - - -
copysign - - - -
copysignl - - - -
cosf 1 1 1 1
cos 2 2 2 2
cosl 1 - 1 1
coshf - - - -
cosh - - - -
coshl - - - -
cpowf 5 + i 2 4 + i 2 4 + i 2 5 + i 2
cpow 2 + i 0 1 + i 1.1031 2 + i 0 2 + i 0
cpowl 4 + i 1 - 4 + i 1 3 + i 4
cprojf - - - -
cproj - - - -
cprojl - - - -
crealf - - - -
creal - - - -
creall - - - -
csinf 1 + i 0 0 + i 1 1 + i 0 1 + i 0
csin 1 + i 0 - 1 + i 0 1 + i 0
csinl 1 + i 1 - 1 + i 1 1 + i 0
csinhf 1 + i 1 1 + i 1 1 + i 1 1 + i 1
csinh 0 + i 1 0 + i 1 0 + i 1 0 + i 1
csinhl 1 + i 1 - 1 + i 1 1 + i 0
csqrtf 1 + i 1 1 + i 1 1 + i 1 1 + i 1
csqrt 1 + i 1 1 + i 0 1 + i 1 1 + i 1
csqrtl 1 + i 1 - 1 + i 1 1 + i 1
ctanf 1 + i 1 1 + i 1 1 + i 0 1 + i 2
ctan 1 + i 1 1 + i 1 1 + i 1 1 + i 1
ctanl 2 + i 2 - 2 + i 2 2 + i 1
ctanhf 2 + i 1 2 + i 1 1 + i 2 2 + i 2
ctanh 1 + i 1 2 + i 2 1 + i 1 1 + i 1
ctanhl 2 + i 2 - 2 + i 2 1 + i 2
erff - - - -
erf 1 - 1 1
erfl - - - -
erfcf 1 12 1 1
erfc 1 24 1 1
erfcl 1 - 1 1
expf - - - -
exp - - - -
expl - - - -
exp10f - 2 - -
exp10 1 6 1 1
exp10l 1 - 1 1
exp2f - - - -
exp2 - - - -
exp2l 1 - 1 -
expm1f 1 1 1 1
expm1 1 - 1 1
expm1l 1 - 1 1
fabsf - - - -
fabs - - - -
fabsl - - - -
fdimf - - - -
fdim - - - -
fdiml - - - -
floorf - - - -
floor - - - -
floorl - - - -
fmaf - - - -
fma - - - -
fmal - - - -
fmaxf - - - -
fmax - - - -
fmaxl - - - -
fminf - - - -
fmin - - - -
fminl - - - -
fmodf - 1 - -
fmod - 2 - -
fmodl - - - -
frexpf - - - -
frexp - - - -
frexpl - - - -
gammaf 2 - 2 2
gamma 1 - 1 1
gammal 1 - 1 1
hypotf 1 1 1 1
hypot - 1 - -
hypotl - - - -
ilogbf - - - -
ilogb - - - -
ilogbl - - - -
j0f 2 2 2 2
j0 2 2 2 2
j0l 2 - 2 2
j1f 2 2 2 2
j1 1 1 1 1
j1l 4 - 4 1
jnf 5 4 5 5
jn 4 6 4 4
jnl 8 - 8 3
lgammaf 2 2 2 2
lgamma 1 1 1 1
lgammal 1 - 1 1
lrintf - - - -
lrint - - - -
lrintl - - - -
llrintf - - - -
llrint - - - -
llrintl - - - -
logf - 1 - -
log - 1 - -
logl - - - -
log10f 2 1 2 2
log10 1 1 1 1
log10l 1 - 1 1
log1pf - 1 1 1
log1p - 1 - -
log1pl 1 - 1 -
log2f - 1 - -
log2 - 1 - -
log2l 1 - 1 -
logbf - - - -
logb - - - -
logbl - - - -
lroundf - - - -
lround - - - -
lroundl - - - -
llroundf - - - -
llround - - - -
llroundl - - - -
modff - - - -
modf - - - -
modfl - - - -
nearbyintf - - - -
nearbyint - - - -
nearbyintl - - - -
nextafterf - - - -
nextafter - - - -
nextafterl - - - -
nexttowardf - - - -
nexttoward - - - -
nexttowardl - - - -
powf 1 - 1 1
pow - - - -
powl 1 - 1 1
remainderf - - - -
remainder - - - -
remainderl - - - -
remquof - - - -
remquo - - - -
remquol - - - -
rintf - - - -
rint - - - -
rintl - - - -
roundf - - - -
round - - - -
roundl - - - -
scalbf - - - -
scalb - - - -
scalbl - - - -
scalbnf - - - -
scalbn - - - -
scalbnl - - - -
scalblnf - - - -
scalbln - - - -
scalblnl - - - -
sinf - - - -
sin - - - -
sinl - - - -
sincosf 1 1 1 1
sincos 1 1 1 1
sincosl 1 - 1 1
sinhf - 1 - -
sinh - 1 - -
sinhl - - - 1
sqrtf - - - -
sqrt - - - -
sqrtl - - - -
tanf - - - -
tan 1 0.5 1 1
tanl - - - 1
tanhf - 1 - -
tanh - 1 - -
tanhl 1 - 1 -
tgammaf 3 1 3 3
tgamma 4 1 4 4
tgammal 4 - 4 4
truncf - - - -
trunc - - - -
truncl - - - -
y0f 1 1 1 1
y0 2 2 2 2
y0l 3 - 3 1
y1f 2 2 2 2
y1 3 3 3 3
y1l 2 - 2 2
ynf 2 2 2 2
yn 3 3 3 3
ynl 5 - 5 4

File: libc.info, Node: Pseudo-Random Numbers, Next: FP Function Optimizations, Prev: Errors in Math Functions, Up: Mathematics
19.8 Pseudo-Random Numbers
==========================
This section describes the GNU facilities for generating a series of
pseudo-random numbers. The numbers generated are not truly random;
typically, they form a sequence that repeats periodically, with a period
so large that you can ignore it for ordinary purposes. The random
number generator works by remembering a "seed" value which it uses to
compute the next random number and also to compute a new seed.
Although the generated numbers look unpredictable within one run of a
program, the sequence of numbers is _exactly the same_ from one run to
the next. This is because the initial seed is always the same. This
is convenient when you are debugging a program, but it is unhelpful if
you want the program to behave unpredictably. If you want a different
pseudo-random series each time your program runs, you must specify a
different seed each time. For ordinary purposes, basing the seed on the
current time works well.
You can obtain repeatable sequences of numbers on a particular
machine type by specifying the same initial seed value for the random
number generator. There is no standard meaning for a particular seed
value; the same seed, used in different C libraries or on different CPU
types, will give you different random numbers.
The GNU C Library supports the standard ISO C random number functions
plus two other sets derived from BSD and SVID. The BSD and ISO C
functions provide identical, somewhat limited functionality. If only a
small number of random bits are required, we recommend you use the
ISO C interface, `rand' and `srand'. The SVID functions provide a more
flexible interface, which allows better random number generator
algorithms, provides more random bits (up to 48) per call, and can
provide random floating-point numbers. These functions are required by
the XPG standard and therefore will be present in all modern Unix
systems.
* Menu:
* ISO Random:: `rand' and friends.
* BSD Random:: `random' and friends.
* SVID Random:: `drand48' and friends.

File: libc.info, Node: ISO Random, Next: BSD Random, Up: Pseudo-Random Numbers
19.8.1 ISO C Random Number Functions
------------------------------------
This section describes the random number functions that are part of the
ISO C standard.
To use these facilities, you should include the header file
`stdlib.h' in your program.
-- Macro: int RAND_MAX
The value of this macro is an integer constant representing the
largest value the `rand' function can return. In the GNU C
Library, it is `2147483647', which is the largest signed integer
representable in 32 bits. In other libraries, it may be as low as
`32767'.
-- Function: int rand (void)
The `rand' function returns the next pseudo-random number in the
series. The value ranges from `0' to `RAND_MAX'.
-- Function: void srand (unsigned int SEED)
This function establishes SEED as the seed for a new series of
pseudo-random numbers. If you call `rand' before a seed has been
established with `srand', it uses the value `1' as a default seed.
To produce a different pseudo-random series each time your program
is run, do `srand (time (0))'.
POSIX.1 extended the C standard functions to support reproducible
random numbers in multi-threaded programs. However, the extension is
badly designed and unsuitable for serious work.
-- Function: int rand_r (unsigned int *SEED)
This function returns a random number in the range 0 to `RAND_MAX'
just as `rand' does. However, all its state is stored in the SEED
argument. This means the RNG's state can only have as many bits
as the type `unsigned int' has. This is far too few to provide a
good RNG.
If your program requires a reentrant RNG, we recommend you use the
reentrant GNU extensions to the SVID random number generator. The
POSIX.1 interface should only be used when the GNU extensions are
not available.

File: libc.info, Node: BSD Random, Next: SVID Random, Prev: ISO Random, Up: Pseudo-Random Numbers
19.8.2 BSD Random Number Functions
----------------------------------
This section describes a set of random number generation functions that
are derived from BSD. There is no advantage to using these functions
with the GNU C Library; we support them for BSD compatibility only.
The prototypes for these functions are in `stdlib.h'.
-- Function: long int random (void)
This function returns the next pseudo-random number in the
sequence. The value returned ranges from `0' to `RAND_MAX'.
*NB:* Temporarily this function was defined to return a `int32_t'
value to indicate that the return value always contains 32 bits
even if `long int' is wider. The standard demands it differently.
Users must always be aware of the 32-bit limitation, though.
-- Function: void srandom (unsigned int SEED)
The `srandom' function sets the state of the random number
generator based on the integer SEED. If you supply a SEED value
of `1', this will cause `random' to reproduce the default set of
random numbers.
To produce a different set of pseudo-random numbers each time your
program runs, do `srandom (time (0))'.
-- Function: char * initstate (unsigned int SEED, char *STATE, size_t
SIZE)
The `initstate' function is used to initialize the random number
generator state. The argument STATE is an array of SIZE bytes,
used to hold the state information. It is initialized based on
SEED. The size must be between 8 and 256 bytes, and should be a
power of two. The bigger the STATE array, the better.
The return value is the previous value of the state information
array. You can use this value later as an argument to `setstate'
to restore that state.
-- Function: char * setstate (char *STATE)
The `setstate' function restores the random number state
information STATE. The argument must have been the result of a
previous call to INITSTATE or SETSTATE.
The return value is the previous value of the state information
array. You can use this value later as an argument to `setstate'
to restore that state.
If the function fails the return value is `NULL'.
The four functions described so far in this section all work on a
state which is shared by all threads. The state is not directly
accessible to the user and can only be modified by these functions.
This makes it hard to deal with situations where each thread should
have its own pseudo-random number generator.
The GNU C Library contains four additional functions which contain
the state as an explicit parameter and therefore make it possible to
handle thread-local PRNGs. Beside this there is no difference. In
fact, the four functions already discussed are implemented internally
using the following interfaces.
The `stdlib.h' header contains a definition of the following type:
-- Data Type: struct random_data
Objects of type `struct random_data' contain the information
necessary to represent the state of the PRNG. Although a complete
definition of the type is present the type should be treated as
opaque.
The functions modifying the state follow exactly the already
described functions.
-- Function: int random_r (struct random_data *restrict BUF, int32_t
*restrict RESULT)
The `random_r' function behaves exactly like the `random' function
except that it uses and modifies the state in the object pointed
to by the first parameter instead of the global state.
-- Function: int srandom_r (unsigned int SEED, struct random_data *BUF)
The `srandom_r' function behaves exactly like the `srandom'
function except that it uses and modifies the state in the object
pointed to by the second parameter instead of the global state.
-- Function: int initstate_r (unsigned int SEED, char *restrict
STATEBUF, size_t STATELEN, struct random_data *restrict BUF)
The `initstate_r' function behaves exactly like the `initstate'
function except that it uses and modifies the state in the object
pointed to by the fourth parameter instead of the global state.
-- Function: int setstate_r (char *restrict STATEBUF, struct
random_data *restrict BUF)
The `setstate_r' function behaves exactly like the `setstate'
function except that it uses and modifies the state in the object
pointed to by the first parameter instead of the global state.

File: libc.info, Node: SVID Random, Prev: BSD Random, Up: Pseudo-Random Numbers
19.8.3 SVID Random Number Function
----------------------------------
The C library on SVID systems contains yet another kind of random number
generator functions. They use a state of 48 bits of data. The user can
choose among a collection of functions which return the random bits in
different forms.
Generally there are two kinds of function. The first uses a state of
the random number generator which is shared among several functions and
by all threads of the process. The second requires the user to handle
the state.
All functions have in common that they use the same congruential
formula with the same constants. The formula is
Y = (a * X + c) mod m
where X is the state of the generator at the beginning and Y the state
at the end. `a' and `c' are constants determining the way the
generator works. By default they are
a = 0x5DEECE66D = 25214903917
c = 0xb = 11
but they can also be changed by the user. `m' is of course 2^48 since
the state consists of a 48-bit array.
The prototypes for these functions are in `stdlib.h'.
-- Function: double drand48 (void)
This function returns a `double' value in the range of `0.0' to
`1.0' (exclusive). The random bits are determined by the global
state of the random number generator in the C library.
Since the `double' type according to IEEE 754 has a 52-bit
mantissa this means 4 bits are not initialized by the random number
generator. These are (of course) chosen to be the least
significant bits and they are initialized to `0'.
-- Function: double erand48 (unsigned short int XSUBI[3])
This function returns a `double' value in the range of `0.0' to
`1.0' (exclusive), similarly to `drand48'. The argument is an
array describing the state of the random number generator.
This function can be called subsequently since it updates the
array to guarantee random numbers. The array should have been
initialized before initial use to obtain reproducible results.
-- Function: long int lrand48 (void)
The `lrand48' function returns an integer value in the range of
`0' to `2^31' (exclusive). Even if the size of the `long int'
type can take more than 32 bits, no higher numbers are returned.
The random bits are determined by the global state of the random
number generator in the C library.
-- Function: long int nrand48 (unsigned short int XSUBI[3])
This function is similar to the `lrand48' function in that it
returns a number in the range of `0' to `2^31' (exclusive) but the
state of the random number generator used to produce the random
bits is determined by the array provided as the parameter to the
function.
The numbers in the array are updated afterwards so that subsequent
calls to this function yield different results (as is expected of
a random number generator). The array should have been
initialized before the first call to obtain reproducible results.
-- Function: long int mrand48 (void)
The `mrand48' function is similar to `lrand48'. The only
difference is that the numbers returned are in the range `-2^31' to
`2^31' (exclusive).
-- Function: long int jrand48 (unsigned short int XSUBI[3])
The `jrand48' function is similar to `nrand48'. The only
difference is that the numbers returned are in the range `-2^31' to
`2^31' (exclusive). For the `xsubi' parameter the same
requirements are necessary.
The internal state of the random number generator can be initialized
in several ways. The methods differ in the completeness of the
information provided.
-- Function: void srand48 (long int SEEDVAL)
The `srand48' function sets the most significant 32 bits of the
internal state of the random number generator to the least
significant 32 bits of the SEEDVAL parameter. The lower 16 bits
are initialized to the value `0x330E'. Even if the `long int'
type contains more than 32 bits only the lower 32 bits are used.
Owing to this limitation, initialization of the state of this
function is not very useful. But it makes it easy to use a
construct like `srand48 (time (0))'.
A side-effect of this function is that the values `a' and `c' from
the internal state, which are used in the congruential formula,
are reset to the default values given above. This is of
importance once the user has called the `lcong48' function (see
below).
-- Function: unsigned short int * seed48 (unsigned short int
SEED16V[3])
The `seed48' function initializes all 48 bits of the state of the
internal random number generator from the contents of the parameter
SEED16V. Here the lower 16 bits of the first element of SEE16V
initialize the least significant 16 bits of the internal state,
the lower 16 bits of `SEED16V[1]' initialize the mid-order 16 bits
of the state and the 16 lower bits of `SEED16V[2]' initialize the
most significant 16 bits of the state.
Unlike `srand48' this function lets the user initialize all 48 bits
of the state.
The value returned by `seed48' is a pointer to an array containing
the values of the internal state before the change. This might be
useful to restart the random number generator at a certain state.
Otherwise the value can simply be ignored.
As for `srand48', the values `a' and `c' from the congruential
formula are reset to the default values.
There is one more function to initialize the random number generator
which enables you to specify even more information by allowing you to
change the parameters in the congruential formula.
-- Function: void lcong48 (unsigned short int PARAM[7])
The `lcong48' function allows the user to change the complete state
of the random number generator. Unlike `srand48' and `seed48',
this function also changes the constants in the congruential
formula.
From the seven elements in the array PARAM the least significant
16 bits of the entries `PARAM[0]' to `PARAM[2]' determine the
initial state, the least significant 16 bits of `PARAM[3]' to
`PARAM[5]' determine the 48 bit constant `a' and `PARAM[6]'
determines the 16-bit value `c'.
All the above functions have in common that they use the global
parameters for the congruential formula. In multi-threaded programs it
might sometimes be useful to have different parameters in different
threads. For this reason all the above functions have a counterpart
which works on a description of the random number generator in the
user-supplied buffer instead of the global state.
Please note that it is no problem if several threads use the global
state if all threads use the functions which take a pointer to an array
containing the state. The random numbers are computed following the
same loop but if the state in the array is different all threads will
obtain an individual random number generator.
The user-supplied buffer must be of type `struct drand48_data'.
This type should be regarded as opaque and not manipulated directly.
-- Function: int drand48_r (struct drand48_data *BUFFER, double
*RESULT)
This function is equivalent to the `drand48' function with the
difference that it does not modify the global random number
generator parameters but instead the parameters in the buffer
supplied through the pointer BUFFER. The random number is
returned in the variable pointed to by RESULT.
The return value of the function indicates whether the call
succeeded. If the value is less than `0' an error occurred and
ERRNO is set to indicate the problem.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int erand48_r (unsigned short int XSUBI[3], struct
drand48_data *BUFFER, double *RESULT)
The `erand48_r' function works like `erand48', but in addition it
takes an argument BUFFER which describes the random number
generator. The state of the random number generator is taken from
the `xsubi' array, the parameters for the congruential formula
from the global random number generator data. The random number
is returned in the variable pointed to by RESULT.
The return value is non-negative if the call succeeded.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int lrand48_r (struct drand48_data *BUFFER, long int
*RESULT)
This function is similar to `lrand48', but in addition it takes a
pointer to a buffer describing the state of the random number
generator just like `drand48'.
If the return value of the function is non-negative the variable
pointed to by RESULT contains the result. Otherwise an error
occurred.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int nrand48_r (unsigned short int XSUBI[3], struct
drand48_data *BUFFER, long int *RESULT)
The `nrand48_r' function works like `nrand48' in that it produces
a random number in the range `0' to `2^31'. But instead of using
the global parameters for the congruential formula it uses the
information from the buffer pointed to by BUFFER. The state is
described by the values in XSUBI.
If the return value is non-negative the variable pointed to by
RESULT contains the result.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int mrand48_r (struct drand48_data *BUFFER, long int
*RESULT)
This function is similar to `mrand48' but like the other reentrant
functions it uses the random number generator described by the
value in the buffer pointed to by BUFFER.
If the return value is non-negative the variable pointed to by
RESULT contains the result.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int jrand48_r (unsigned short int XSUBI[3], struct
drand48_data *BUFFER, long int *RESULT)
The `jrand48_r' function is similar to `jrand48'. Like the other
reentrant functions of this function family it uses the
congruential formula parameters from the buffer pointed to by
BUFFER.
If the return value is non-negative the variable pointed to by
RESULT contains the result.
This function is a GNU extension and should not be used in portable
programs.
Before any of the above functions are used the buffer of type
`struct drand48_data' should be initialized. The easiest way to do
this is to fill the whole buffer with null bytes, e.g. by
memset (buffer, '\0', sizeof (struct drand48_data));
Using any of the reentrant functions of this family now will
automatically initialize the random number generator to the default
values for the state and the parameters of the congruential formula.
The other possibility is to use any of the functions which explicitly
initialize the buffer. Though it might be obvious how to initialize the
buffer from looking at the parameter to the function, it is highly
recommended to use these functions since the result might not always be
what you expect.
-- Function: int srand48_r (long int SEEDVAL, struct drand48_data
*BUFFER)
The description of the random number generator represented by the
information in BUFFER is initialized similarly to what the function
`srand48' does. The state is initialized from the parameter
SEEDVAL and the parameters for the congruential formula are
initialized to their default values.
If the return value is non-negative the function call succeeded.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int seed48_r (unsigned short int SEED16V[3], struct
drand48_data *BUFFER)
This function is similar to `srand48_r' but like `seed48' it
initializes all 48 bits of the state from the parameter SEED16V.
If the return value is non-negative the function call succeeded.
It does not return a pointer to the previous state of the random
number generator like the `seed48' function does. If the user
wants to preserve the state for a later re-run s/he can copy the
whole buffer pointed to by BUFFER.
This function is a GNU extension and should not be used in portable
programs.
-- Function: int lcong48_r (unsigned short int PARAM[7], struct
drand48_data *BUFFER)
This function initializes all aspects of the random number
generator described in BUFFER with the data in PARAM. Here it is
especially true that the function does more than just copying the
contents of PARAM and BUFFER. More work is required and therefore
it is important to use this function rather than initializing the
random number generator directly.
If the return value is non-negative the function call succeeded.
This function is a GNU extension and should not be used in portable
programs.

File: libc.info, Node: FP Function Optimizations, Prev: Pseudo-Random Numbers, Up: Mathematics
19.9 Is Fast Code or Small Code preferred?
==========================================
If an application uses many floating point functions it is often the
case that the cost of the function calls themselves is not negligible.
Modern processors can often execute the operations themselves very
fast, but the function call disrupts the instruction pipeline.
For this reason the GNU C Library provides optimizations for many of
the frequently-used math functions. When GNU CC is used and the user
activates the optimizer, several new inline functions and macros are
defined. These new functions and macros have the same names as the
library functions and so are used instead of the latter. In the case of
inline functions the compiler will decide whether it is reasonable to
use them, and this decision is usually correct.
This means that no calls to the library functions may be necessary,
and can increase the speed of generated code significantly. The
drawback is that code size will increase, and the increase is not
always negligible.
There are two kind of inline functions: Those that give the same
result as the library functions and others that might not set `errno'
and might have a reduced precision and/or argument range in comparison
with the library functions. The latter inline functions are only
available if the flag `-ffast-math' is given to GNU CC.
In cases where the inline functions and macros are not wanted the
symbol `__NO_MATH_INLINES' should be defined before any system header is
included. This will ensure that only library functions are used. Of
course, it can be determined for each file in the project whether
giving this option is preferable or not.
Not all hardware implements the entire IEEE 754 standard, and even
if it does there may be a substantial performance penalty for using some
of its features. For example, enabling traps on some processors forces
the FPU to run un-pipelined, which can more than double calculation
time.

File: libc.info, Node: Arithmetic, Next: Date and Time, Prev: Mathematics, Up: Top
20 Arithmetic Functions
***********************
This chapter contains information about functions for doing basic
arithmetic operations, such as splitting a float into its integer and
fractional parts or retrieving the imaginary part of a complex value.
These functions are declared in the header files `math.h' and
`complex.h'.
* Menu:
* Integers:: Basic integer types and concepts
* Integer Division:: Integer division with guaranteed rounding.
* Floating Point Numbers:: Basic concepts. IEEE 754.
* Floating Point Classes:: The five kinds of floating-point number.
* Floating Point Errors:: When something goes wrong in a calculation.
* Rounding:: Controlling how results are rounded.
* Control Functions:: Saving and restoring the FPU's state.
* Arithmetic Functions:: Fundamental operations provided by the library.
* Complex Numbers:: The types. Writing complex constants.
* Operations on Complex:: Projection, conjugation, decomposition.
* Parsing of Numbers:: Converting strings to numbers.
* System V Number Conversion:: An archaic way to convert numbers to strings.

File: libc.info, Node: Integers, Next: Integer Division, Up: Arithmetic
20.1 Integers
=============
The C language defines several integer data types: integer, short
integer, long integer, and character, all in both signed and unsigned
varieties. The GNU C compiler extends the language to contain long
long integers as well.
The C integer types were intended to allow code to be portable among
machines with different inherent data sizes (word sizes), so each type
may have different ranges on different machines. The problem with this
is that a program often needs to be written for a particular range of
integers, and sometimes must be written for a particular size of
storage, regardless of what machine the program runs on.
To address this problem, the GNU C Library contains C type
definitions you can use to declare integers that meet your exact needs.
Because the GNU C Library header files are customized to a specific
machine, your program source code doesn't have to be.
These `typedef's are in `stdint.h'.
If you require that an integer be represented in exactly N bits, use
one of the following types, with the obvious mapping to bit size and
signedness:
* int8_t
* int16_t
* int32_t
* int64_t
* uint8_t
* uint16_t
* uint32_t
* uint64_t
If your C compiler and target machine do not allow integers of a
certain size, the corresponding above type does not exist.
If you don't need a specific storage size, but want the smallest data
structure with _at least_ N bits, use one of these:
* int_least8_t
* int_least16_t
* int_least32_t
* int_least64_t
* uint_least8_t
* uint_least16_t
* uint_least32_t
* uint_least64_t
If you don't need a specific storage size, but want the data
structure that allows the fastest access while having at least N bits
(and among data structures with the same access speed, the smallest
one), use one of these:
* int_fast8_t
* int_fast16_t
* int_fast32_t
* int_fast64_t
* uint_fast8_t
* uint_fast16_t
* uint_fast32_t
* uint_fast64_t
If you want an integer with the widest range possible on the
platform on which it is being used, use one of the following. If you
use these, you should write code that takes into account the variable
size and range of the integer.
* intmax_t
* uintmax_t
The GNU C Library also provides macros that tell you the maximum and
minimum possible values for each integer data type. The macro names
follow these examples: `INT32_MAX', `UINT8_MAX', `INT_FAST32_MIN',
`INT_LEAST64_MIN', `UINTMAX_MAX', `INTMAX_MAX', `INTMAX_MIN'. Note
that there are no macros for unsigned integer minima. These are always
zero.
There are similar macros for use with C's built in integer types
which should come with your C compiler. These are described in *note
Data Type Measurements::.
Don't forget you can use the C `sizeof' function with any of these
data types to get the number of bytes of storage each uses.

File: libc.info, Node: Integer Division, Next: Floating Point Numbers, Prev: Integers, Up: Arithmetic
20.2 Integer Division
=====================
This section describes functions for performing integer division. These
functions are redundant when GNU CC is used, because in GNU C the `/'
operator always rounds towards zero. But in other C implementations,
`/' may round differently with negative arguments. `div' and `ldiv'
are useful because they specify how to round the quotient: towards
zero. The remainder has the same sign as the numerator.
These functions are specified to return a result R such that the
value `R.quot*DENOMINATOR + R.rem' equals NUMERATOR.
To use these facilities, you should include the header file
`stdlib.h' in your program.
-- Data Type: div_t
This is a structure type used to hold the result returned by the
`div' function. It has the following members:
`int quot'
The quotient from the division.
`int rem'
The remainder from the division.
-- Function: div_t div (int NUMERATOR, int DENOMINATOR)
This function `div' computes the quotient and remainder from the
division of NUMERATOR by DENOMINATOR, returning the result in a
structure of type `div_t'.
If the result cannot be represented (as in a division by zero), the
behavior is undefined.
Here is an example, albeit not a very useful one.
div_t result;
result = div (20, -6);
Now `result.quot' is `-3' and `result.rem' is `2'.
-- Data Type: ldiv_t
This is a structure type used to hold the result returned by the
`ldiv' function. It has the following members:
`long int quot'
The quotient from the division.
`long int rem'
The remainder from the division.
(This is identical to `div_t' except that the components are of
type `long int' rather than `int'.)
-- Function: ldiv_t ldiv (long int NUMERATOR, long int DENOMINATOR)
The `ldiv' function is similar to `div', except that the arguments
are of type `long int' and the result is returned as a structure
of type `ldiv_t'.
-- Data Type: lldiv_t
This is a structure type used to hold the result returned by the
`lldiv' function. It has the following members:
`long long int quot'
The quotient from the division.
`long long int rem'
The remainder from the division.
(This is identical to `div_t' except that the components are of
type `long long int' rather than `int'.)
-- Function: lldiv_t lldiv (long long int NUMERATOR, long long int
DENOMINATOR)
The `lldiv' function is like the `div' function, but the arguments
are of type `long long int' and the result is returned as a
structure of type `lldiv_t'.
The `lldiv' function was added in ISO C99.
-- Data Type: imaxdiv_t
This is a structure type used to hold the result returned by the
`imaxdiv' function. It has the following members:
`intmax_t quot'
The quotient from the division.
`intmax_t rem'
The remainder from the division.
(This is identical to `div_t' except that the components are of
type `intmax_t' rather than `int'.)
See *note Integers:: for a description of the `intmax_t' type.
-- Function: imaxdiv_t imaxdiv (intmax_t NUMERATOR, intmax_t
DENOMINATOR)
The `imaxdiv' function is like the `div' function, but the
arguments are of type `intmax_t' and the result is returned as a
structure of type `imaxdiv_t'.
See *note Integers:: for a description of the `intmax_t' type.
The `imaxdiv' function was added in ISO C99.

File: libc.info, Node: Floating Point Numbers, Next: Floating Point Classes, Prev: Integer Division, Up: Arithmetic
20.3 Floating Point Numbers
===========================
Most computer hardware has support for two different kinds of numbers:
integers (...-3, -2, -1, 0, 1, 2, 3...) and floating-point numbers.
Floating-point numbers have three parts: the "mantissa", the
"exponent", and the "sign bit". The real number represented by a
floating-point value is given by (s ? -1 : 1) * 2^e * M where s is the
sign bit, e the exponent, and M the mantissa. *Note Floating Point
Concepts::, for details. (It is possible to have a different "base"
for the exponent, but all modern hardware uses 2.)
Floating-point numbers can represent a finite subset of the real
numbers. While this subset is large enough for most purposes, it is
important to remember that the only reals that can be represented
exactly are rational numbers that have a terminating binary expansion
shorter than the width of the mantissa. Even simple fractions such as
1/5 can only be approximated by floating point.
Mathematical operations and functions frequently need to produce
values that are not representable. Often these values can be
approximated closely enough for practical purposes, but sometimes they
can't. Historically there was no way to tell when the results of a
calculation were inaccurate. Modern computers implement the IEEE 754
standard for numerical computations, which defines a framework for
indicating to the program when the results of calculation are not
trustworthy. This framework consists of a set of "exceptions" that
indicate why a result could not be represented, and the special values
"infinity" and "not a number" (NaN).

File: libc.info, Node: Floating Point Classes, Next: Floating Point Errors, Prev: Floating Point Numbers, Up: Arithmetic
20.4 Floating-Point Number Classification Functions
===================================================
ISO C99 defines macros that let you determine what sort of
floating-point number a variable holds.
-- Macro: int fpclassify (_float-type_ X)
This is a generic macro which works on all floating-point types and
which returns a value of type `int'. The possible values are:
`FP_NAN'
The floating-point number X is "Not a Number" (*note Infinity
and NaN::)
`FP_INFINITE'
The value of X is either plus or minus infinity (*note
Infinity and NaN::)
`FP_ZERO'
The value of X is zero. In floating-point formats like
IEEE 754, where zero can be signed, this value is also
returned if X is negative zero.
`FP_SUBNORMAL'
Numbers whose absolute value is too small to be represented
in the normal format are represented in an alternate,
"denormalized" format (*note Floating Point Concepts::).
This format is less precise but can represent values closer
to zero. `fpclassify' returns this value for values of X in
this alternate format.
`FP_NORMAL'
This value is returned for all other values of X. It
indicates that there is nothing special about the number.
`fpclassify' is most useful if more than one property of a number
must be tested. There are more specific macros which only test one
property at a time. Generally these macros execute faster than
`fpclassify', since there is special hardware support for them. You
should therefore use the specific macros whenever possible.
-- Macro: int isfinite (_float-type_ X)
This macro returns a nonzero value if X is finite: not plus or
minus infinity, and not NaN. It is equivalent to
(fpclassify (x) != FP_NAN && fpclassify (x) != FP_INFINITE)
`isfinite' is implemented as a macro which accepts any
floating-point type.
-- Macro: int isnormal (_float-type_ X)
This macro returns a nonzero value if X is finite and normalized.
It is equivalent to
(fpclassify (x) == FP_NORMAL)
-- Macro: int isnan (_float-type_ X)
This macro returns a nonzero value if X is NaN. It is equivalent
to
(fpclassify (x) == FP_NAN)
-- Macro: int issignaling (_float-type_ X)
This macro returns a nonzero value if X is a signaling NaN (sNaN).
It is based on draft TS 18661 and currently enabled as a GNU
extension.
Another set of floating-point classification functions was provided
by BSD. The GNU C Library also supports these functions; however, we
recommend that you use the ISO C99 macros in new code. Those are
standard and will be available more widely. Also, since they are
macros, you do not have to worry about the type of their argument.
-- Function: int isinf (double X)
-- Function: int isinff (float X)
-- Function: int isinfl (long double X)
This function returns `-1' if X represents negative infinity, `1'
if X represents positive infinity, and `0' otherwise.
-- Function: int isnan (double X)
-- Function: int isnanf (float X)
-- Function: int isnanl (long double X)
This function returns a nonzero value if X is a "not a number"
value, and zero otherwise.
*NB:* The `isnan' macro defined by ISO C99 overrides the BSD
function. This is normally not a problem, because the two
routines behave identically. However, if you really need to get
the BSD function for some reason, you can write
(isnan) (x)
-- Function: int finite (double X)
-- Function: int finitef (float X)
-- Function: int finitel (long double X)
This function returns a nonzero value if X is finite or a "not a
number" value, and zero otherwise.
*Portability Note:* The functions listed in this section are BSD
extensions.

File: libc.info, Node: Floating Point Errors, Next: Rounding, Prev: Floating Point Classes, Up: Arithmetic
20.5 Errors in Floating-Point Calculations
==========================================
* Menu:
* FP Exceptions:: IEEE 754 math exceptions and how to detect them.
* Infinity and NaN:: Special values returned by calculations.
* Status bit operations:: Checking for exceptions after the fact.
* Math Error Reporting:: How the math functions report errors.

File: libc.info, Node: FP Exceptions, Next: Infinity and NaN, Up: Floating Point Errors
20.5.1 FP Exceptions
--------------------
The IEEE 754 standard defines five "exceptions" that can occur during a
calculation. Each corresponds to a particular sort of error, such as
overflow.
When exceptions occur (when exceptions are "raised", in the language
of the standard), one of two things can happen. By default the
exception is simply noted in the floating-point "status word", and the
program continues as if nothing had happened. The operation produces a
default value, which depends on the exception (see the table below).
Your program can check the status word to find out which exceptions
happened.
Alternatively, you can enable "traps" for exceptions. In that case,
when an exception is raised, your program will receive the `SIGFPE'
signal. The default action for this signal is to terminate the
program. *Note Signal Handling::, for how you can change the effect of
the signal.
In the System V math library, the user-defined function `matherr' is
called when certain exceptions occur inside math library functions.
However, the Unix98 standard deprecates this interface. We support it
for historical compatibility, but recommend that you do not use it in
new programs.
The exceptions defined in IEEE 754 are:
`Invalid Operation'
This exception is raised if the given operands are invalid for the
operation to be performed. Examples are (see IEEE 754, section 7):
1. Addition or subtraction: oo - oo. (But oo + oo = oo).
2. Multiplication: 0 * oo.
3. Division: 0/0 or oo/oo.
4. Remainder: x REM y, where y is zero or x is infinite.
5. Square root if the operand is less then zero. More
generally, any mathematical function evaluated outside its
domain produces this exception.
6. Conversion of a floating-point number to an integer or decimal
string, when the number cannot be represented in the target
format (due to overflow, infinity, or NaN).
7. Conversion of an unrecognizable input string.
8. Comparison via predicates involving < or >, when one or other
of the operands is NaN. You can prevent this exception by
using the unordered comparison functions instead; see *note
FP Comparison Functions::.
If the exception does not trap, the result of the operation is NaN.
`Division by Zero'
This exception is raised when a finite nonzero number is divided
by zero. If no trap occurs the result is either +oo or -oo,
depending on the signs of the operands.
`Overflow'
This exception is raised whenever the result cannot be represented
as a finite value in the precision format of the destination. If
no trap occurs the result depends on the sign of the intermediate
result and the current rounding mode (IEEE 754, section 7.3):
1. Round to nearest carries all overflows to oo with the sign of
the intermediate result.
2. Round toward 0 carries all overflows to the largest
representable finite number with the sign of the intermediate
result.
3. Round toward -oo carries positive overflows to the largest
representable finite number and negative overflows to -oo.
4. Round toward oo carries negative overflows to the most
negative representable finite number and positive overflows
to oo.
Whenever the overflow exception is raised, the inexact exception
is also raised.
`Underflow'
The underflow exception is raised when an intermediate result is
too small to be calculated accurately, or if the operation's
result rounded to the destination precision is too small to be
normalized.
When no trap is installed for the underflow exception, underflow is
signaled (via the underflow flag) only when both tininess and loss
of accuracy have been detected. If no trap handler is installed
the operation continues with an imprecise small value, or zero if
the destination precision cannot hold the small exact result.
`Inexact'
This exception is signalled if a rounded result is not exact (such
as when calculating the square root of two) or a result overflows
without an overflow trap.

File: libc.info, Node: Infinity and NaN, Next: Status bit operations, Prev: FP Exceptions, Up: Floating Point Errors
20.5.2 Infinity and NaN
-----------------------
IEEE 754 floating point numbers can represent positive or negative
infinity, and "NaN" (not a number). These three values arise from
calculations whose result is undefined or cannot be represented
accurately. You can also deliberately set a floating-point variable to
any of them, which is sometimes useful. Some examples of calculations
that produce infinity or NaN:
1/0 = oo
log (0) = -oo
sqrt (-1) = NaN
When a calculation produces any of these values, an exception also
occurs; see *note FP Exceptions::.
The basic operations and math functions all accept infinity and NaN
and produce sensible output. Infinities propagate through calculations
as one would expect: for example, 2 + oo = oo, 4/oo = 0, atan (oo) =
pi/2. NaN, on the other hand, infects any calculation that involves
it. Unless the calculation would produce the same result no matter
what real value replaced NaN, the result is NaN.
In comparison operations, positive infinity is larger than all values
except itself and NaN, and negative infinity is smaller than all values
except itself and NaN. NaN is "unordered": it is not equal to, greater
than, or less than anything, _including itself_. `x == x' is false if
the value of `x' is NaN. You can use this to test whether a value is
NaN or not, but the recommended way to test for NaN is with the `isnan'
function (*note Floating Point Classes::). In addition, `<', `>',
`<=', and `>=' will raise an exception when applied to NaNs.
`math.h' defines macros that allow you to explicitly set a variable
to infinity or NaN.
-- Macro: float INFINITY
An expression representing positive infinity. It is equal to the
value produced by mathematical operations like `1.0 / 0.0'.
`-INFINITY' represents negative infinity.
You can test whether a floating-point value is infinite by
comparing it to this macro. However, this is not recommended; you
should use the `isfinite' macro instead. *Note Floating Point
Classes::.
This macro was introduced in the ISO C99 standard.
-- Macro: float NAN
An expression representing a value which is "not a number". This
macro is a GNU extension, available only on machines that support
the "not a number" value--that is to say, on all machines that
support IEEE floating point.
You can use `#ifdef NAN' to test whether the machine supports NaN.
(Of course, you must arrange for GNU extensions to be visible,
such as by defining `_GNU_SOURCE', and then you must include
`math.h'.)
IEEE 754 also allows for another unusual value: negative zero. This
value is produced when you divide a positive number by negative
infinity, or when a negative result is smaller than the limits of
representation.

File: libc.info, Node: Status bit operations, Next: Math Error Reporting, Prev: Infinity and NaN, Up: Floating Point Errors
20.5.3 Examining the FPU status word
------------------------------------
ISO C99 defines functions to query and manipulate the floating-point
status word. You can use these functions to check for untrapped
exceptions when it's convenient, rather than worrying about them in the
middle of a calculation.
These constants represent the various IEEE 754 exceptions. Not all
FPUs report all the different exceptions. Each constant is defined if
and only if the FPU you are compiling for supports that exception, so
you can test for FPU support with `#ifdef'. They are defined in
`fenv.h'.
`FE_INEXACT'
The inexact exception.
`FE_DIVBYZERO'
The divide by zero exception.
`FE_UNDERFLOW'
The underflow exception.
`FE_OVERFLOW'
The overflow exception.
`FE_INVALID'
The invalid exception.
The macro `FE_ALL_EXCEPT' is the bitwise OR of all exception macros
which are supported by the FP implementation.
These functions allow you to clear exception flags, test for
exceptions, and save and restore the set of exceptions flagged.
-- Function: int feclearexcept (int EXCEPTS)
This function clears all of the supported exception flags
indicated by EXCEPTS.
The function returns zero in case the operation was successful, a
non-zero value otherwise.
-- Function: int feraiseexcept (int EXCEPTS)
This function raises the supported exceptions indicated by
EXCEPTS. If more than one exception bit in EXCEPTS is set the
order in which the exceptions are raised is undefined except that
overflow (`FE_OVERFLOW') or underflow (`FE_UNDERFLOW') are raised
before inexact (`FE_INEXACT'). Whether for overflow or underflow
the inexact exception is also raised is also implementation
dependent.
The function returns zero in case the operation was successful, a
non-zero value otherwise.
-- Function: int fetestexcept (int EXCEPTS)
Test whether the exception flags indicated by the parameter EXCEPT
are currently set. If any of them are, a nonzero value is returned
which specifies which exceptions are set. Otherwise the result is
zero.
To understand these functions, imagine that the status word is an
integer variable named STATUS. `feclearexcept' is then equivalent to
`status &= ~excepts' and `fetestexcept' is equivalent to `(status &
excepts)'. The actual implementation may be very different, of course.
Exception flags are only cleared when the program explicitly
requests it, by calling `feclearexcept'. If you want to check for
exceptions from a set of calculations, you should clear all the flags
first. Here is a simple example of the way to use `fetestexcept':
{
double f;
int raised;
feclearexcept (FE_ALL_EXCEPT);
f = compute ();
raised = fetestexcept (FE_OVERFLOW | FE_INVALID);
if (raised & FE_OVERFLOW) { /* ... */ }
if (raised & FE_INVALID) { /* ... */ }
/* ... */
}
You cannot explicitly set bits in the status word. You can, however,
save the entire status word and restore it later. This is done with the
following functions:
-- Function: int fegetexceptflag (fexcept_t *FLAGP, int EXCEPTS)
This function stores in the variable pointed to by FLAGP an
implementation-defined value representing the current setting of
the exception flags indicated by EXCEPTS.
The function returns zero in case the operation was successful, a
non-zero value otherwise.
-- Function: int fesetexceptflag (const fexcept_t *FLAGP, int EXCEPTS)
This function restores the flags for the exceptions indicated by
EXCEPTS to the values stored in the variable pointed to by FLAGP.
The function returns zero in case the operation was successful, a
non-zero value otherwise.
Note that the value stored in `fexcept_t' bears no resemblance to
the bit mask returned by `fetestexcept'. The type may not even be an
integer. Do not attempt to modify an `fexcept_t' variable.

File: libc.info, Node: Math Error Reporting, Prev: Status bit operations, Up: Floating Point Errors
20.5.4 Error Reporting by Mathematical Functions
------------------------------------------------
Many of the math functions are defined only over a subset of the real or
complex numbers. Even if they are mathematically defined, their result
may be larger or smaller than the range representable by their return
type. These are known as "domain errors", "overflows", and
"underflows", respectively. Math functions do several things when one
of these errors occurs. In this manual we will refer to the complete
response as "signalling" a domain error, overflow, or underflow.