shm.h 2.7 KB

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  1. /*
  2. * Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd.
  3. *
  4. * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
  5. * in this tarball.
  6. */
  7. #ifndef _SYS_SHM_H
  8. # error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
  9. #endif
  10. #include <bits/types.h>
  11. /* Permission flag for shmget. */
  12. #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
  13. #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
  14. /* Flags for `shmat'. */
  15. #define SHM_RDONLY 010000 /* attach read-only else read-write */
  16. #define SHM_RND 020000 /* round attach address to SHMLBA */
  17. #define SHM_REMAP 040000 /* take-over region on attach */
  18. /* Commands for `shmctl'. */
  19. #define SHM_LOCK 11 /* lock segment (root only) */
  20. #define SHM_UNLOCK 12 /* unlock segment (root only) */
  21. __BEGIN_DECLS
  22. /* Segment low boundary address multiple. */
  23. #define SHMLBA (__getpagesize () << 2)
  24. extern int __getpagesize (void) __THROW __attribute__ ((__const__));
  25. /* Type to count number of attaches. */
  26. typedef unsigned long int shmatt_t;
  27. /* Data structure describing a set of semaphores. */
  28. struct shmid_ds
  29. {
  30. struct ipc_perm shm_perm; /* operation permission struct */
  31. size_t shm_segsz; /* size of segment in bytes */
  32. __time_t shm_atime; /* time of last shmat() */
  33. unsigned long int __unused1;
  34. __time_t shm_dtime; /* time of last shmdt() */
  35. unsigned long int __unused2;
  36. __time_t shm_ctime; /* time of last change by shmctl() */
  37. unsigned long int __unused3;
  38. __pid_t shm_cpid; /* pid of creator */
  39. __pid_t shm_lpid; /* pid of last shmop */
  40. shmatt_t shm_nattch; /* number of current attaches */
  41. unsigned long int __unused4;
  42. unsigned long int __unused5;
  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. # define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
  52. # define SHM_NORESERVE 010000 /* don't check for reservations */
  53. struct shminfo
  54. {
  55. unsigned long int shmmax;
  56. unsigned long int shmmin;
  57. unsigned long int shmmni;
  58. unsigned long int shmseg;
  59. unsigned long int shmall;
  60. unsigned long int __unused1;
  61. unsigned long int __unused2;
  62. unsigned long int __unused3;
  63. unsigned long int __unused4;
  64. };
  65. struct shm_info
  66. {
  67. int used_ids;
  68. unsigned long int shm_tot; /* total allocated shm */
  69. unsigned long int shm_rss; /* total resident shm */
  70. unsigned long int shm_swp; /* total swapped shm */
  71. unsigned long int swap_attempts;
  72. unsigned long int swap_successes;
  73. };
  74. #endif /* __USE_MISC */
  75. __END_DECLS