shm.h 3.4 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 2000, 2002, 2004
  2. 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_SHM_H
  17. # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  18. #endif
  19. #include <bits/types.h>
  20. #include <bits/wordsize.h>
  21. /* Permission flag for shmget. */
  22. #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
  23. #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
  24. /* Flags for `shmat'. */
  25. #define SHM_RDONLY 010000 /* attach read-only else read-write */
  26. #define SHM_RND 020000 /* round attach address to SHMLBA */
  27. #define SHM_REMAP 040000 /* take-over region on attach */
  28. /* Commands for `shmctl'. */
  29. #define SHM_LOCK 11 /* lock segment (root only) */
  30. #define SHM_UNLOCK 12 /* unlock segment (root only) */
  31. __BEGIN_DECLS
  32. /* Segment low boundary address multiple. */
  33. #define SHMLBA (__getpagesize ())
  34. extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  35. /* Type to count number of attaches. */
  36. typedef unsigned long int shmatt_t;
  37. /* Data structure describing a set of semaphores. */
  38. struct shmid_ds
  39. {
  40. struct ipc_perm shm_perm; /* operation permission struct */
  41. #if __WORDSIZE == 32
  42. unsigned int __pad1;
  43. #endif
  44. __time_t shm_atime; /* time of last shmat() */
  45. #if __WORDSIZE == 32
  46. unsigned int __pad2;
  47. #endif
  48. __time_t shm_dtime; /* time of last shmdt() */
  49. #if __WORDSIZE == 32
  50. unsigned int __pad3;
  51. #endif
  52. __time_t shm_ctime; /* time of last change by shmctl() */
  53. size_t shm_segsz; /* size of segment in bytes */
  54. __pid_t shm_cpid; /* pid of creator */
  55. __pid_t shm_lpid; /* pid of last shmop */
  56. shmatt_t shm_nattch; /* number of current attaches */
  57. unsigned long int __unused1;
  58. unsigned long int __unused2;
  59. };
  60. #ifdef __USE_MISC
  61. /* ipcs ctl commands */
  62. # define SHM_STAT 13
  63. # define SHM_INFO 14
  64. /* shm_mode upper byte flags */
  65. # define SHM_DEST 01000 /* segment will be destroyed on last detach */
  66. # define SHM_LOCKED 02000 /* segment will not be swapped */
  67. # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
  68. # define SHM_NORESERVE 010000 /* don't check for reservations */
  69. struct shminfo
  70. {
  71. unsigned long shmmax;
  72. unsigned long shmmin;
  73. unsigned long shmmni;
  74. unsigned long shmseg;
  75. unsigned long shmall;
  76. unsigned long __unused1;
  77. unsigned long __unused2;
  78. unsigned long __unused3;
  79. unsigned long __unused4;
  80. };
  81. struct shm_info
  82. {
  83. int used_ids;
  84. unsigned long int shm_tot; /* total allocated shm */
  85. unsigned long int shm_rss; /* total resident shm */
  86. unsigned long int shm_swp; /* total swapped shm */
  87. unsigned long int swap_attempts;
  88. unsigned long int swap_successes;
  89. };
  90. #endif /* __USE_MISC */
  91. __END_DECLS