sem.h 2.7 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 1998 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_SEM_H
  16. # error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
  17. #endif
  18. #include <sys/types.h>
  19. /* Flags for `semop'. */
  20. #define SEM_UNDO 0x1000 /* undo the operation on exit */
  21. /* Commands for `semctl'. */
  22. #define GETPID 11 /* get sempid */
  23. #define GETVAL 12 /* get semval */
  24. #define GETALL 13 /* get all semval's */
  25. #define GETNCNT 14 /* get semncnt */
  26. #define GETZCNT 15 /* get semzcnt */
  27. #define SETVAL 16 /* set semval */
  28. #define SETALL 17 /* set all semval's */
  29. /* Data structure describing a set of semaphores. */
  30. struct semid_ds
  31. {
  32. struct ipc_perm sem_perm; /* operation permission struct */
  33. __time_t sem_otime; /* last semop() time */
  34. __time_t sem_ctime; /* last time changed by semctl() */
  35. struct sem *__sembase; /* ptr to first semaphore in array */
  36. struct sem_queue *__sem_pending; /* pending operations */
  37. struct sem_queue *__sem_pending_last; /* last pending operation */
  38. struct sem_undo *__undo; /* ondo requests on this array */
  39. unsigned short int sem_nsems; /* number of semaphores in set */
  40. };
  41. /* The user should define a union like the following to use it for arguments
  42. for `semctl'.
  43. union semun
  44. {
  45. int val; <= value for SETVAL
  46. struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
  47. unsigned short int *array; <= array for GETALL & SETALL
  48. struct seminfo *__buf; <= buffer for IPC_INFO
  49. };
  50. Previous versions of this file used to define this union but this is
  51. incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  52. one must define the union or not. */
  53. #define _SEM_SEMUN_UNDEFINED 1
  54. #ifdef __USE_MISC
  55. /* ipcs ctl cmds */
  56. # define SEM_STAT 18
  57. # define SEM_INFO 19
  58. struct seminfo
  59. {
  60. int semmap;
  61. int semmni;
  62. int semmns;
  63. int semmnu;
  64. int semmsl;
  65. int semopm;
  66. int semume;
  67. int semusz;
  68. int semvmx;
  69. int semaem;
  70. };
  71. #endif /* __USE_MISC */