mman.h 4.3 KB

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  1. /* Definitions for POSIX memory map interface. Linux/MIPS version.
  2. Copyright (C) 1997, 2000, 2003, 2004, 2005, 2006
  3. Free Software Foundation, Inc.
  4. 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.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, see
  15. <http://www.gnu.org/licenses/>. */
  16. #ifndef _SYS_MMAN_H
  17. # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
  18. #endif
  19. /* The following definitions basically come from the kernel headers.
  20. But the kernel header is not namespace clean. */
  21. /* Protections are chosen from these bits, OR'd together. The
  22. implementation does not necessarily support PROT_EXEC or PROT_WRITE
  23. without PROT_READ. The only guarantees are that no writing will be
  24. allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
  25. #define PROT_READ 0x1 /* Page can be read. */
  26. #define PROT_WRITE 0x2 /* Page can be written. */
  27. #define PROT_EXEC 0x4 /* Page can be executed. */
  28. #define PROT_NONE 0x0 /* Page can not be accessed. */
  29. #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of
  30. growsdown vma (mprotect only). */
  31. #define PROT_GROWSUP 0x02000000 /* Extend change to start of
  32. growsup vma (mprotect only). */
  33. /* Sharing types (must choose one and only one of these). */
  34. #define MAP_SHARED 0x01 /* Share changes. */
  35. #define MAP_PRIVATE 0x02 /* Changes are private. */
  36. #ifdef __USE_MISC
  37. # define MAP_TYPE 0x0f /* Mask for type of mapping. */
  38. #endif
  39. /* Other flags. */
  40. #define MAP_FIXED 0x10 /* Interpret addr exactly. */
  41. #ifdef __USE_MISC
  42. # define MAP_FILE 0
  43. # define MAP_ANONYMOUS 0x0800 /* Don't use a file. */
  44. # define MAP_ANON MAP_ANONYMOUS
  45. # define MAP_RENAME MAP_ANONYMOUS
  46. #endif
  47. /* These are Linux-specific. */
  48. #ifdef __USE_MISC
  49. # define MAP_NORESERVE 0x0400 /* don't check for reservations */
  50. # define MAP_ANONYMOUS 0x0800 /* don't use a file */
  51. # define MAP_GROWSDOWN 0x1000 /* stack-like segment */
  52. # define MAP_DENYWRITE 0x2000 /* ETXTBSY */
  53. # define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
  54. # define MAP_LOCKED 0x8000 /* pages are locked */
  55. # define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
  56. # define MAP_NONBLOCK 0x20000 /* do not block on IO */
  57. # define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could
  58. be uninitialized. */
  59. #endif
  60. /* Flags to `msync'. */
  61. #define MS_ASYNC 1 /* Sync memory asynchronously. */
  62. #define MS_SYNC 4 /* Synchronous memory sync. */
  63. #define MS_INVALIDATE 2 /* Invalidate the caches. */
  64. /* Flags for `mlockall'. */
  65. #define MCL_CURRENT 1 /* Lock all currently mapped pages. */
  66. #define MCL_FUTURE 2 /* Lock all additions to address
  67. space. */
  68. /* Flags for `mremap'. */
  69. #ifdef __USE_GNU
  70. # define MREMAP_MAYMOVE 1
  71. # define MREMAP_FIXED 2
  72. #endif
  73. /* Advice to `madvise'. */
  74. #ifdef __USE_BSD
  75. # define MADV_NORMAL 0 /* No further special treatment. */
  76. # define MADV_RANDOM 1 /* Expect random page references. */
  77. # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
  78. # define MADV_WILLNEED 3 /* Will need these pages. */
  79. # define MADV_DONTNEED 4 /* Don't need these pages. */
  80. # define MADV_REMOVE 9 /* Remove these pages and resources. */
  81. # define MADV_DONTFORK 10 /* Do not inherit across fork. */
  82. # define MADV_DOFORK 11 /* Do inherit across fork. */
  83. #endif
  84. /* The POSIX people had to invent similar names for the same things. */
  85. #ifdef __USE_XOPEN2K
  86. # define POSIX_MADV_NORMAL 0 /* No further special treatment. */
  87. # define POSIX_MADV_RANDOM 1 /* Expect random page references. */
  88. # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */
  89. # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
  90. # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
  91. #endif