shm.h 3.1 KB

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  1. /* Copyright (C) 2000, 2002, 2005 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, see
  13. <http://www.gnu.org/licenses/>. */
  14. #ifndef _SYS_SHM_H
  15. # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  16. #endif
  17. #include <sys/types.h>
  18. /* Permission flag for shmget. */
  19. #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
  20. #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
  21. /* Flags for `shmat'. */
  22. #define SHM_RDONLY 010000 /* attach read-only else read-write */
  23. #define SHM_RND 020000 /* round attach address to SHMLBA */
  24. #define SHM_REMAP 040000 /* take-over region on attach */
  25. /* Commands for `shmctl'. */
  26. #define SHM_LOCK 11 /* lock segment (root only) */
  27. #define SHM_UNLOCK 12 /* unlock segment (root only) */
  28. /* Segment low boundary address multiple. */
  29. #define SHMLBA (1024 * 1024)
  30. /* Type to count number of attaches. */
  31. typedef unsigned long int shmatt_t;
  32. /* Data structure describing a set of semaphores. */
  33. struct shmid_ds
  34. {
  35. struct ipc_perm shm_perm; /* operation permission struct */
  36. size_t shm_segsz; /* size of segment in bytes */
  37. __time_t shm_atime; /* time of last shmat() */
  38. __time_t shm_dtime; /* time of last shmdt() */
  39. __time_t shm_ctime; /* time of last change by shmctl() */
  40. __pid_t shm_cpid; /* pid of creator */
  41. __pid_t shm_lpid; /* pid of last shmop */
  42. shmatt_t shm_nattch; /* number of current attaches */
  43. unsigned long int __unused1;
  44. unsigned long int __unused2;
  45. };
  46. #ifdef __USE_MISC
  47. /* ipcs ctl commands */
  48. # define SHM_STAT 13
  49. # define SHM_INFO 14
  50. /* shm_mode upper byte flags */
  51. # define SHM_DEST 01000 /* segment will be destroyed on last detach */
  52. # define SHM_LOCKED 02000 /* segment will not be swapped */
  53. # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
  54. # define SHM_NORESERVE 010000 /* don't check for reservations */
  55. struct shminfo
  56. {
  57. unsigned long int shmmax;
  58. unsigned long int shmmin;
  59. unsigned long int shmmni;
  60. unsigned long int shmseg;
  61. unsigned long int shmall;
  62. unsigned long int __unused1;
  63. unsigned long int __unused2;
  64. unsigned long int __unused3;
  65. unsigned long int __unused4;
  66. };
  67. struct shm_info
  68. {
  69. int used_ids;
  70. unsigned long int shm_tot; /* total allocated shm */
  71. unsigned long int shm_rss; /* total resident shm */
  72. unsigned long int shm_swp; /* total swapped shm */
  73. unsigned long int swap_attempts;
  74. unsigned long int swap_successes;
  75. };
  76. #endif /* __USE_MISC */