| /* `fd_set' type and related macros, and `select'/`pselect' declarations. |
| Copyright (C) 1996,97,98,99,2000,01,02,2003 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| /* POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h> */ |
| |
| #ifndef _SYS_SELECT_H |
| #define _SYS_SELECT_H 1 |
| |
| #include <features.h> |
| |
| /* Get definition of needed basic types. */ |
| #include <bits/types.h> |
| |
| /* Get __FD_* definitions. */ |
| #include <bits/select.h> |
| |
| /* Get __sigset_t. */ |
| #include <bits/sigset.h> |
| |
| #ifndef __sigset_t_defined |
| # define __sigset_t_defined |
| typedef __sigset_t sigset_t; |
| #endif |
| |
| /* Get definition of timer specification structures. */ |
| #define __need_time_t |
| #define __need_timespec |
| #include <time.h> |
| #define __need_timeval |
| #include <bits/time.h> |
| |
| #ifndef __suseconds_t_defined |
| typedef __suseconds_t suseconds_t; |
| # define __suseconds_t_defined |
| #endif |
| |
| |
| /* The fd_set member is required to be an array of longs. */ |
| typedef long int __fd_mask; |
| |
| /* Some versions of <linux/posix_types.h> define these macros. */ |
| #undef __NFDBITS |
| #undef __FDELT |
| #undef __FDMASK |
| /* It's easier to assume 8-bit bytes than to get CHAR_BIT. */ |
| #define __NFDBITS (8 * sizeof (__fd_mask)) |
| #define __FDELT(d) ((d) / __NFDBITS) |
| #define __FDMASK(d) ((__fd_mask) 1 << ((d) % __NFDBITS)) |
| |
| /* fd_set for select and pselect. */ |
| typedef struct |
| { |
| /* XPG4.2 requires this member name. Otherwise avoid the name |
| from the global namespace. */ |
| #ifdef __USE_XOPEN |
| __fd_mask fds_bits[__FD_SETSIZE / __NFDBITS]; |
| # define __FDS_BITS(set) ((set)->fds_bits) |
| #else |
| __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS]; |
| # define __FDS_BITS(set) ((set)->__fds_bits) |
| #endif |
| } fd_set; |
| |
| /* Maximum number of file descriptors in `fd_set'. */ |
| #define FD_SETSIZE __FD_SETSIZE |
| |
| #ifdef __USE_MISC |
| /* Sometimes the fd_set member is assumed to have this type. */ |
| typedef __fd_mask fd_mask; |
| |
| /* Number of bits per word of `fd_set' (some code assumes this is 32). */ |
| # define NFDBITS __NFDBITS |
| #endif |
| |
| |
| /* Access macros for `fd_set'. */ |
| #define FD_SET(fd, fdsetp) __FD_SET (fd, fdsetp) |
| #define FD_CLR(fd, fdsetp) __FD_CLR (fd, fdsetp) |
| #define FD_ISSET(fd, fdsetp) __FD_ISSET (fd, fdsetp) |
| #define FD_ZERO(fdsetp) __FD_ZERO (fdsetp) |
| |
| |
| __BEGIN_DECLS |
| |
| /* Check the first NFDS descriptors each in READFDS (if not NULL) for read |
| readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS |
| (if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out |
| after waiting the interval specified therein. Returns the number of ready |
| descriptors, or -1 for errors. |
| |
| This function is a cancellation point and therefore not marked with |
| __THROW. */ |
| extern int select (int __nfds, fd_set *__restrict __readfds, |
| fd_set *__restrict __writefds, |
| fd_set *__restrict __exceptfds, |
| struct timeval *__restrict __timeout); |
| |
| #ifdef __USE_XOPEN2K |
| /* Same as above only that the TIMEOUT value is given with higher |
| resolution and a sigmask which is been set temporarily. This version |
| should be used. |
| |
| This function is a cancellation point and therefore not marked with |
| __THROW. */ |
| extern int pselect (int __nfds, fd_set *__restrict __readfds, |
| fd_set *__restrict __writefds, |
| fd_set *__restrict __exceptfds, |
| const struct timespec *__restrict __timeout, |
| const __sigset_t *__restrict __sigmask); |
| #endif |
| |
| __END_DECLS |
| |
| #endif /* sys/select.h */ |