mman-common.h 4.6 KB

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  1. /* Definitions for POSIX memory map interface. Linux/generic version.
  2. Copyright (C) 1997,2000,2003,2005,2006,2009 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, see
  14. <http://www.gnu.org/licenses/>. */
  15. #ifndef _SYS_MMAN_H
  16. # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
  17. #endif
  18. /* The following definitions basically come from the kernel headers.
  19. But the kernel header is not namespace clean. */
  20. /* Protections are chosen from these bits, OR'd together. The
  21. implementation does not necessarily support PROT_EXEC or PROT_WRITE
  22. without PROT_READ. The only guarantees are that no writing will be
  23. allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
  24. #define PROT_READ 0x1 /* Page can be read. */
  25. #define PROT_WRITE 0x2 /* Page can be written. */
  26. #define PROT_EXEC 0x4 /* Page can be executed. */
  27. #define PROT_NONE 0x0 /* Page can not be accessed. */
  28. #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of
  29. growsdown vma (mprotect only). */
  30. #define PROT_GROWSUP 0x02000000 /* Extend change to start of
  31. growsup vma (mprotect only). */
  32. /* Sharing types (must choose one and only one of these). */
  33. #define MAP_SHARED 0x01 /* Share changes. */
  34. #define MAP_PRIVATE 0x02 /* Changes are private. */
  35. #ifdef __USE_MISC
  36. # define MAP_TYPE 0x0f /* Mask for type of mapping. */
  37. #endif
  38. /* Other flags. */
  39. #define MAP_FIXED 0x10 /* Interpret addr exactly. */
  40. #ifdef __USE_MISC
  41. # define MAP_FILE 0
  42. # define MAP_ANONYMOUS 0x20 /* Don't use a file. */
  43. # define MAP_ANON MAP_ANONYMOUS
  44. #endif
  45. /* These are Linux-specific. */
  46. #ifdef __USE_MISC
  47. # define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */
  48. # define MAP_DENYWRITE 0x00800 /* ETXTBSY */
  49. # define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */
  50. # define MAP_LOCKED 0x02000 /* Lock the mapping. */
  51. # define MAP_NORESERVE 0x04000 /* Don't check for reservations. */
  52. # define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */
  53. # define MAP_NONBLOCK 0x10000 /* Do not block on IO. */
  54. # define MAP_STACK 0x20000 /* Allocation is for a stack. */
  55. # define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could
  56. be uninitialized. */
  57. #endif
  58. /* Flags to `msync'. */
  59. #define MS_ASYNC 1 /* Sync memory asynchronously. */
  60. #define MS_SYNC 4 /* Synchronous memory sync. */
  61. #define MS_INVALIDATE 2 /* Invalidate the caches. */
  62. /* Flags for `mlockall'. */
  63. #define MCL_CURRENT 1 /* Lock all currently mapped pages. */
  64. #define MCL_FUTURE 2 /* Lock all additions to address
  65. space. */
  66. /* Flags for `mremap'. */
  67. #ifdef __USE_GNU
  68. # define MREMAP_MAYMOVE 1
  69. # define MREMAP_FIXED 2
  70. #endif
  71. /* only define for MMU targets, no-MMU does not support madvise. */
  72. #ifdef __ARCH_USE_MMU__
  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. # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */
  84. # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */
  85. # define MADV_HWPOISON 100 /* Poison a page for testing. */
  86. # endif
  87. /* The POSIX people had to invent similar names for the same things. */
  88. # ifdef __USE_XOPEN2K
  89. # define POSIX_MADV_NORMAL 0 /* No further special treatment. */
  90. # define POSIX_MADV_RANDOM 1 /* Expect random page references. */
  91. # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */
  92. # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
  93. # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
  94. # endif
  95. #endif