| /* Definitions for BSD-style memory management. |
| Copyright (C) 1994-2000, 2003, 2004, 2005 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. */ |
| |
| #ifndef _SYS_MMAN_H |
| #define _SYS_MMAN_H 1 |
| |
| #include <features.h> |
| #include <bits/types.h> |
| #define __need_size_t |
| #include <stddef.h> |
| |
| #ifndef __off_t_defined |
| # ifndef __USE_FILE_OFFSET64 |
| typedef __off_t off_t; |
| # else |
| typedef __off64_t off_t; |
| # endif |
| # define __off_t_defined |
| #endif |
| |
| #ifndef __mode_t_defined |
| typedef __mode_t mode_t; |
| # define __mode_t_defined |
| #endif |
| |
| #include <bits/mman.h> |
| |
| /* Return value of `mmap' in case of an error. */ |
| #define MAP_FAILED ((void *) -1) |
| |
| __BEGIN_DECLS |
| /* Map addresses starting near ADDR and extending for LEN bytes. from |
| OFFSET into the file FD describes according to PROT and FLAGS. If ADDR |
| is nonzero, it is the desired mapping address. If the MAP_FIXED bit is |
| set in FLAGS, the mapping will be at ADDR exactly (which must be |
| page-aligned); otherwise the system chooses a convenient nearby address. |
| The return value is the actual mapping address chosen or MAP_FAILED |
| for errors (in which case `errno' is set). A successful `mmap' call |
| deallocates any previous mapping for the affected region. */ |
| |
| #ifndef __USE_FILE_OFFSET64 |
| extern void *mmap (void *__addr, size_t __len, int __prot, |
| int __flags, int __fd, __off_t __offset) __THROW; |
| #else |
| # ifdef __REDIRECT_NTH |
| extern void * __REDIRECT_NTH (mmap, |
| (void *__addr, size_t __len, int __prot, |
| int __flags, int __fd, __off64_t __offset), |
| mmap64); |
| # else |
| # define mmap mmap64 |
| # endif |
| #endif |
| #ifdef __USE_LARGEFILE64 |
| extern void *mmap64 (void *__addr, size_t __len, int __prot, |
| int __flags, int __fd, __off64_t __offset) __THROW; |
| #endif |
| |
| /* Deallocate any mapping for the region starting at ADDR and extending LEN |
| bytes. Returns 0 if successful, -1 for errors (and sets errno). */ |
| extern int munmap (void *__addr, size_t __len) __THROW; |
| |
| /* Change the memory protection of the region starting at ADDR and |
| extending LEN bytes to PROT. Returns 0 if successful, -1 for errors |
| (and sets errno). */ |
| extern int mprotect (void *__addr, size_t __len, int __prot) __THROW; |
| |
| #ifdef __ARCH_USE_MMU__ |
| |
| /* Synchronize the region starting at ADDR and extending LEN bytes with the |
| file it maps. Filesystem operations on a file being mapped are |
| unpredictable before this is done. Flags are from the MS_* set. |
| |
| This function is a cancellation point and therefore not marked with |
| __THROW. */ |
| extern int msync (void *__addr, size_t __len, int __flags); |
| |
| #else |
| |
| /* On no-mmu systems you can't have real private mappings. */ |
| static __inline__ int msync (void *__addr, size_t __len, int __flags) { return 0; } |
| |
| #endif |
| |
| #if defined __USE_BSD && (defined __UCLIBC_LINUX_SPECIFIC__ || defined __UCLIBC_HAS_THREADS_NATIVE__) |
| /* Advise the system about particular usage patterns the program follows |
| for the region starting at ADDR and extending LEN bytes. */ |
| extern int madvise (void *__addr, size_t __len, int __advice) __THROW; |
| #endif |
| #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ |
| /* This is the POSIX name for this function. */ |
| extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW; |
| #endif |
| |
| #if defined __UCLIBC_HAS_REALTIME__ |
| # ifdef __ARCH_USE_MMU__ |
| |
| /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to |
| be memory resident. */ |
| extern int mlock (__const void *__addr, size_t __len) __THROW; |
| |
| /* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN). */ |
| extern int munlock (__const void *__addr, size_t __len) __THROW; |
| |
| /* Cause all currently mapped pages of the process to be memory resident |
| until unlocked by a call to the `munlockall', until the process exits, |
| or until the process calls `execve'. */ |
| extern int mlockall (int __flags) __THROW; |
| |
| /* All currently mapped pages of the process' address space become |
| unlocked. */ |
| extern int munlockall (void) __THROW; |
| |
| #else |
| |
| /* On no-mmu systems, memory cannot be swapped out, so |
| * these functions will always succeed. */ |
| static __inline__ int mlock (__const void *__addr, size_t __len) { return 0; } |
| static __inline__ int munlock (__const void *__addr, size_t __len) { return 0; } |
| static __inline__ int mlockall (int __flags) { return 0; } |
| static __inline__ int munlockall (void) { return 0; } |
| #endif |
| #endif /* __UCLIBC_HAS_REALTIME__ */ |
| |
| #if defined __USE_MISC && defined __UCLIBC_BSD_SPECIFIC__ |
| /* mincore returns the memory residency status of the pages in the |
| current process's address space specified by [start, start + len). |
| The status is returned in a vector of bytes. The least significant |
| bit of each byte is 1 if the referenced page is in memory, otherwise |
| it is zero. */ |
| extern int mincore (void *__start, size_t __len, unsigned char *__vec) |
| __THROW; |
| #endif |
| |
| #ifdef __USE_GNU |
| /* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length |
| NEW_LEN. If MREMAP_MAYMOVE is set in FLAGS the returned address |
| may differ from ADDR. If MREMAP_FIXED is set in FLAGS the function |
| takes another paramter which is a fixed address at which the block |
| resides after a successful call. */ |
| extern void *mremap (void *__addr, size_t __old_len, size_t __new_len, |
| int __flags, ...) __THROW; |
| |
| #ifdef __UCLIBC_LINUX_SPECIFIC__ |
| /* Remap arbitrary pages of a shared backing store within an existing |
| VMA. */ |
| extern int remap_file_pages (void *__start, size_t __size, int __prot, |
| size_t __pgoff, int __flags) __THROW; |
| #endif |
| #endif |
| |
| |
| /* Open shared memory segment. */ |
| extern int shm_open (__const char *__name, int __oflag, mode_t __mode); |
| |
| /* Remove shared memory segment. */ |
| extern int shm_unlink (__const char *__name); |
| |
| __END_DECLS |
| |
| #endif /* sys/mman.h */ |