shm.h 2.9 KB

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  1. /* Copyright (C) 1995, 1996, 1997 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 Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. 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. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 02111-1307, USA. */
  15. #ifndef _SYS_SHM_H
  16. # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  17. #endif
  18. #include <sys/types.h>
  19. /* Permission flag for shmget. */
  20. #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
  21. #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
  22. /* Flags for `shmat'. */
  23. #define SHM_RDONLY 010000 /* attach read-only else read-write */
  24. #define SHM_RND 020000 /* round attach address to SHMLBA */
  25. #define SHM_REMAP 040000 /* take-over region on attach */
  26. /* Commands for `shmctl'. */
  27. #define SHM_LOCK 11 /* lock segment (root only) */
  28. #define SHM_UNLOCK 12 /* unlock segment (root only) */
  29. /* Data structure describing a set of semaphores. */
  30. struct shmid_ds
  31. {
  32. struct ipc_perm shm_perm; /* operation permission struct */
  33. int shm_segsz; /* size of segment in bytes */
  34. __time_t shm_atime; /* time of last shmat() */
  35. __time_t shm_dtime; /* time of last shmdt() */
  36. __time_t shm_ctime; /* time of last change by shmctl() */
  37. __ipc_pid_t shm_cpid; /* pid of creator */
  38. __ipc_pid_t shm_lpid; /* pid of last shmop */
  39. unsigned short int shm_nattch; /* number of current attaches */
  40. unsigned short int __shm_npages; /* size of segment (pages) */
  41. unsigned long int *__shm_pages; /* array of ptrs to frames -> SHMMAX */
  42. struct vm_area_struct *__attaches; /* descriptors for attaches */
  43. };
  44. #ifdef __USE_MISC
  45. /* ipcs ctl commands */
  46. # define SHM_STAT 13
  47. # define SHM_INFO 14
  48. /* shm_mode upper byte flags */
  49. # define SHM_DEST 01000 /* segment will be destroyed on last detach */
  50. # define SHM_LOCKED 02000 /* segment will not be swapped */
  51. struct shminfo
  52. {
  53. int shmmax;
  54. int shmmin;
  55. int shmmni;
  56. int shmseg;
  57. int shmall;
  58. };
  59. struct shm_info
  60. {
  61. int used_ids;
  62. unsigned long int shm_tot; /* total allocated shm */
  63. unsigned long int shm_rss; /* total resident shm */
  64. unsigned long int shm_swp; /* total swapped shm */
  65. unsigned long int swap_attempts;
  66. unsigned long int swap_successes;
  67. };
  68. #endif /* __USE_MISC */