shm.h 3.6 KB

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  1. /* Copyright (C) 1995,1996,1997,2000,2002,2004 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 <bits/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. __BEGIN_DECLS
  29. /* Segment low boundary address multiple. */
  30. /*
  31. * XXX: This is misleading, SH-4 and SH-3 7705 in 32kb mode have dcache
  32. * aliases to contend with in the 4k page case. This is not an issue for
  33. * the other parts. Leave this bumped up for sanity until this can be
  34. * accurately defined by the L1D shape through the auxiliary vector.
  35. */
  36. #define SHMLBA (__getpagesize() << 2)
  37. extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  38. /* Type to count number of attaches. */
  39. typedef unsigned long int shmatt_t;
  40. /* Data structure describing a set of semaphores. */
  41. struct shmid_ds
  42. {
  43. struct ipc_perm shm_perm; /* operation permission struct */
  44. size_t shm_segsz; /* size of segment in bytes */
  45. __time_t shm_atime; /* time of last shmat() */
  46. unsigned long int __unused1;
  47. __time_t shm_dtime; /* time of last shmdt() */
  48. unsigned long int __unused2;
  49. __time_t shm_ctime; /* time of last change by shmctl() */
  50. unsigned long int __unused3;
  51. __pid_t shm_cpid; /* pid of creator */
  52. __pid_t shm_lpid; /* pid of last shmop */
  53. shmatt_t shm_nattch; /* number of current attaches */
  54. unsigned long int __unused4;
  55. unsigned long int __unused5;
  56. };
  57. #ifdef __USE_MISC
  58. /* ipcs ctl commands */
  59. # define SHM_STAT 13
  60. # define SHM_INFO 14
  61. /* shm_mode upper byte flags */
  62. # define SHM_DEST 01000 /* segment will be destroyed on last detach */
  63. # define SHM_LOCKED 02000 /* segment will not be swapped */
  64. # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
  65. # define SHM_NORESERVE 010000 /* don't check for reservations */
  66. struct shminfo
  67. {
  68. unsigned long int shmmax;
  69. unsigned long int shmmin;
  70. unsigned long int shmmni;
  71. unsigned long int shmseg;
  72. unsigned long int shmall;
  73. unsigned long int __unused1;
  74. unsigned long int __unused2;
  75. unsigned long int __unused3;
  76. unsigned long int __unused4;
  77. };
  78. struct shm_info
  79. {
  80. int used_ids;
  81. unsigned long int shm_tot; /* total allocated shm */
  82. unsigned long int shm_rss; /* total resident shm */
  83. unsigned long int shm_swp; /* total swapped shm */
  84. unsigned long int swap_attempts;
  85. unsigned long int swap_successes;
  86. };
  87. #endif /* __USE_MISC */
  88. __END_DECLS