mman.h 3.2 KB

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  1. /* Definitions for POSIX memory map interface. Linux/MIPS version.
  2. Copyright (C) 1997, 2000 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, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  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. /* Sharing types (must choose one and only one of these). */
  30. #define MAP_SHARED 0x01 /* Share changes. */
  31. #define MAP_PRIVATE 0x02 /* Changes are private. */
  32. #ifdef __USE_MISC
  33. # define MAP_TYPE 0x0f /* Mask for type of mapping. */
  34. #endif
  35. /* Other flags. */
  36. #define MAP_FIXED 0x10 /* Interpret addr exactly. */
  37. #ifdef __USE_MISC
  38. # define MAP_FILE 0x00
  39. # define MAP_ANONYMOUS 0x0800 /* Don't use a file. */
  40. # define MAP_ANON MAP_ANONYMOUS
  41. # define MAP_RENAME MAP_ANONYMOUS
  42. #endif
  43. /* These are Linux-specific. */
  44. #ifdef __USE_MISC
  45. # define MAP_NORESERVE 0x0400 /* don't check for reservations */
  46. # define MAP_ANONYMOUS 0x0800 /* don't use a file */
  47. # define MAP_GROWSDOWN 0x1000 /* stack-like segment */
  48. # define MAP_DENYWRITE 0x2000 /* ETXTBSY */
  49. # define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
  50. # define MAP_LOCKED 0x8000 /* pages are locked */
  51. #endif
  52. /* Flags to `msync'. */
  53. #define MS_ASYNC 1 /* Sync memory asynchronously. */
  54. #define MS_INVALIDATE 2 /* Invalidate the caches. */
  55. #define MS_SYNC 4 /* Synchronous memory sync. */
  56. /* Flags for `mlockall'. */
  57. #define MCL_CURRENT 1 /* Lock all currently mapped pages. */
  58. #define MCL_FUTURE 2 /* Lock all additions to address
  59. space. */
  60. /* Advice to `madvise'. */
  61. #ifdef __USE_BSD
  62. #define MADV_NORMAL 0 /* default page-in behavior */
  63. #define MADV_RANDOM 1 /* page-in minimum required */
  64. #define MADV_SEQUENTIAL 2 /* read-ahead aggressively */
  65. #define MADV_WILLNEED 3 /* pre-fault pages */
  66. #define MADV_DONTNEED 4 /* discard these pages */
  67. #endif
  68. /* Flags for `mremap'. */
  69. #ifdef __USE_GNU
  70. # define MREMAP_MAYMOVE 1
  71. #endif