1 /* Definitions for BSD-style memory management.
2 Copyright (C) 1994-1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include <bits/types.h>
28 #ifndef __off_t_defined
29 # ifndef __USE_FILE_OFFSET64
30 typedef __off_t off_t;
32 typedef __off64_t off_t;
34 # define __off_t_defined
37 #ifndef __mode_t_defined
38 typedef __mode_t mode_t;
39 # define __mode_t_defined
42 #include <bits/mman.h>
44 /* Return value of `mmap' in case of an error. */
45 #define MAP_FAILED ((void *) -1)
48 /* Map addresses starting near ADDR and extending for LEN bytes. from
49 OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
50 is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
51 set in FLAGS, the mapping will be at ADDR exactly (which must be
52 page-aligned); otherwise the system chooses a convenient nearby address.
53 The return value is the actual mapping address chosen or MAP_FAILED
54 for errors (in which case `errno' is set). A successful `mmap' call
55 deallocates any previous mapping for the affected region. */
57 #ifndef __USE_FILE_OFFSET64
58 extern void *mmap (void *__addr, size_t __len, int __prot,
59 int __flags, int __fd, __off_t __offset) __THROW;
62 extern void * __REDIRECT (mmap,
63 (void *__addr, size_t __len, int __prot,
64 int __flags, int __fd, __off64_t __offset) __THROW,
70 #ifdef __USE_LARGEFILE64
71 extern void *mmap64 (void *__addr, size_t __len, int __prot,
72 int __flags, int __fd, __off64_t __offset) __THROW;
75 /* Deallocate any mapping for the region starting at ADDR and extending LEN
76 bytes. Returns 0 if successful, -1 for errors (and sets errno). */
77 extern int munmap (void *__addr, size_t __len) __THROW;
79 /* Change the memory protection of the region starting at ADDR and
80 extending LEN bytes to PROT. Returns 0 if successful, -1 for errors
82 extern int mprotect (void *__addr, size_t __len, int __prot) __THROW;
84 /* Synchronize the region starting at ADDR and extending LEN bytes with the
85 file it maps. Filesystem operations on a file being mapped are
86 unpredictable before this is done. Flags are from the MS_* set. */
87 extern int msync (void *__addr, size_t __len, int __flags) __THROW;
90 /* Advise the system about particular usage patterns the program follows
91 for the region starting at ADDR and extending LEN bytes. */
92 extern int madvise (void *__addr, size_t __len, int __advice) __THROW;
95 /* This is the POSIX name for this function. */
96 extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW;
99 /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
100 be memory resident. */
101 extern int mlock (__const void *__addr, size_t __len) __THROW;
103 /* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN). */
104 extern int munlock (__const void *__addr, size_t __len) __THROW;
106 /* Cause all currently mapped pages of the process to be memory resident
107 until unlocked by a call to the `munlockall', until the process exits,
108 or until the process calls `execve'. */
109 extern int mlockall (int __flags) __THROW;
111 /* All currently mapped pages of the process' address space become
113 extern int munlockall (void) __THROW;
116 /* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length
117 NEW_LEN. If MAY_MOVE is MREMAP_MAYMOVE the returned address may
119 extern void *mremap (void *__addr, size_t __old_len, size_t __new_len,
120 int __may_move) __THROW;
122 /* mincore returns the memory residency status of the pages in the
123 current process's address space specified by [start, start + len).
124 The status is returned in a vector of bytes. The least significant
125 bit of each byte is 1 if the referenced page is in memory, otherwise
127 extern int mincore (void *__start, size_t __len, unsigned char *__vec);
131 /* Open shared memory segment. */
132 extern int shm_open (__const char *__name, int __oflag, mode_t __mode);
134 /* Remove shared memory segment. */
135 extern int shm_unlink (__const char *__name);
139 #endif /* sys/mman.h */