shm.h 3.1 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 2000, 2002 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, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 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 <bits/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. __BEGIN_DECLS
  30. /* Segment low boundary address multiple. */
  31. #define SHMLBA (__getpagesize ())
  32. extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  33. __END_DECLS
  34. /* Type to count number of attaches. */
  35. typedef unsigned short shmatt_t;
  36. /* Data structure describing a set of semaphores. */
  37. struct shmid_ds {
  38. struct ipc_perm shm_perm; /* operation perms */
  39. int shm_segsz; /* size of segment (bytes) */
  40. __kernel_time_t shm_atime; /* last attach time */
  41. __kernel_time_t shm_dtime; /* last detach time */
  42. __kernel_time_t shm_ctime; /* last change time */
  43. __kernel_ipc_pid_t shm_cpid; /* pid of creator */
  44. __kernel_ipc_pid_t shm_lpid; /* pid of last operator */
  45. unsigned short shm_nattch; /* no. of current attaches */
  46. unsigned short shm_unused; /* compatibility */
  47. void *shm_unused2; /* ditto - used by DIPC */
  48. void *shm_unused3; /* unused */
  49. };
  50. #ifdef __USE_MISC
  51. /* ipcs ctl commands */
  52. # define SHM_STAT 13
  53. # define SHM_INFO 14
  54. /* shm_mode upper byte flags */
  55. # define SHM_DEST 01000 /* segment will be destroyed on last detach */
  56. # define SHM_LOCKED 02000 /* segment will not be swapped */
  57. # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
  58. struct shminfo {
  59. int shmmax;
  60. int shmmin;
  61. int shmmni;
  62. int shmseg;
  63. int shmall;
  64. };
  65. struct shm_info {
  66. int used_ids;
  67. unsigned long shm_tot; /* total allocated shm */
  68. unsigned long shm_rss; /* total resident shm */
  69. unsigned long shm_swp; /* total swapped shm */
  70. unsigned long swap_attempts;
  71. unsigned long swap_successes;
  72. };
  73. #endif /* __USE_MISC */