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The C and C++ Include Header Files
cat -n /usr/include/x86_64-linux-gnu/sys/mman.h
1 /* Definitions for BSD-style memory management. 2 Copyright (C) 1994-2026 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 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. 9 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. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_MMAN_H 20 #define _SYS_MMAN_H 1 21 22 #include <features.h> 23 #include <bits/types.h> 24 #define __need_size_t 25 #include <stddef.h> 26 27 #ifndef __off_t_defined 28 # ifndef __USE_FILE_OFFSET64 29 typedef __off_t off_t; 30 # else 31 typedef __off64_t off_t; 32 # endif 33 # define __off_t_defined 34 #endif 35 36 #ifndef __mode_t_defined 37 typedef __mode_t mode_t; 38 # define __mode_t_defined 39 #endif 40 41 #include <bits/mman.h> 42 43 /* Return value of `mmap' in case of an error. */ 44 #define MAP_FAILED ((void *) -1) 45 46 __BEGIN_DECLS 47 /* Map addresses starting near ADDR and extending for LEN bytes. from 48 OFFSET into the file FD describes according to PROT and FLAGS. If ADDR 49 is nonzero, it is the desired mapping address. If the MAP_FIXED bit is 50 set in FLAGS, the mapping will be at ADDR exactly (which must be 51 page-aligned); otherwise the system chooses a convenient nearby address. 52 The return value is the actual mapping address chosen or MAP_FAILED 53 for errors (in which case `errno' is set). A successful `mmap' call 54 deallocates any previous mapping for the affected region. */ 55 56 #ifndef __USE_FILE_OFFSET64 57 extern void *mmap (void *__addr, size_t __len, int __prot, 58 int __flags, int __fd, __off_t __offset) __THROW; 59 #else 60 # ifdef __REDIRECT_NTH 61 extern void * __REDIRECT_NTH (mmap, 62 (void *__addr, size_t __len, int __prot, 63 int __flags, int __fd, __off64_t __offset), 64 mmap64); 65 # else 66 # define mmap mmap64 67 # endif 68 #endif 69 #ifdef __USE_LARGEFILE64 70 extern void *mmap64 (void *__addr, size_t __len, int __prot, 71 int __flags, int __fd, __off64_t __offset) __THROW; 72 #endif 73 74 /* Deallocate any mapping for the region starting at ADDR and extending LEN 75 bytes. Returns 0 if successful, -1 for errors (and sets errno). */ 76 extern int munmap (void *__addr, size_t __len) __THROW; 77 78 /* Change the memory protection of the region starting at ADDR and 79 extending LEN bytes to PROT. Returns 0 if successful, -1 for errors 80 (and sets errno). */ 81 extern int mprotect (void *__addr, size_t __len, int __prot) __THROW; 82 83 /* Synchronize the region starting at ADDR and extending LEN bytes with the 84 file it maps. Filesystem operations on a file being mapped are 85 unpredictable before this is done. Flags are from the MS_* set. 86 87 This function is a cancellation point and therefore not marked with 88 __THROW. */ 89 extern int msync (void *__addr, size_t __len, int __flags); 90 91 #ifdef __USE_MISC 92 /* Advise the system about particular usage patterns the program follows 93 for the region starting at ADDR and extending LEN bytes. */ 94 extern int madvise (void *__addr, size_t __len, int __advice) __THROW; 95 #endif 96 #ifdef __USE_XOPEN2K 97 /* This is the POSIX name for this function. */ 98 extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW; 99 #endif 100 101 /* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to 102 be memory resident. */ 103 extern int mlock (const void *__addr, size_t __len) __THROW 104 __attr_access_none (1); 105 106 /* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN). */ 107 extern int munlock (const void *__addr, size_t __len) __THROW 108 __attr_access_none (1); 109 110 /* Cause all currently mapped pages of the process to be memory resident 111 until unlocked by a call to the `munlockall', until the process exits, 112 or until the process calls `execve'. */ 113 extern int mlockall (int __flags) __THROW; 114 115 /* All currently mapped pages of the process' address space become 116 unlocked. */ 117 extern int munlockall (void) __THROW; 118 119 #ifdef __USE_MISC 120 /* mincore returns the memory residency status of the pages in the 121 current process's address space specified by [start, start + len). 122 The status is returned in a vector of bytes. The least significant 123 bit of each byte is 1 if the referenced page is in memory, otherwise 124 it is zero. */ 125 extern int mincore (void *__start, size_t __len, unsigned char *__vec) 126 __THROW; 127 #endif 128 129 #ifdef __USE_GNU 130 /* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length 131 NEW_LEN. If MREMAP_MAYMOVE is set in FLAGS the returned address 132 may differ from ADDR. If MREMAP_FIXED is set in FLAGS the function 133 takes another parameter which is a fixed address at which the block 134 resides after a successful call. */ 135 extern void *mremap (void *__addr, size_t __old_len, size_t __new_len, 136 int __flags, ...) __THROW; 137 138 /* Remap arbitrary pages of a shared backing store within an existing 139 VMA. */ 140 extern int remap_file_pages (void *__start, size_t __size, int __prot, 141 size_t __pgoff, int __flags) __THROW; 142 #endif 143 144 145 /* Open shared memory segment. */ 146 extern int shm_open (const char *__name, int __oflag, mode_t __mode); 147 148 /* Remove shared memory segment. */ 149 extern int shm_unlink (const char *__name); 150 151 /* System-specific extensions. */ 152 #include <bits/mman_ext.h> 153 154 __END_DECLS 155 156 #endif /* sys/mman.h */
