sem.h 2.7 KB

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  1. /* Copyright (C) 1995, 1996, 1997, 1998, 2000 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_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. struct ipc_perm sem_perm; /* permissions .. see ipc.h */
  32. __kernel_time_t sem_otime; /* last semop time */
  33. __kernel_time_t sem_ctime; /* last change time */
  34. struct sem *sem_base; /* ptr to first semaphore in array */
  35. struct sem_queue *sem_pending; /* pending operations to be processed */
  36. struct sem_queue **sem_pending_last; /* last pending operation */
  37. struct sem_undo *undo; /* undo requests on this array */
  38. unsigned short sem_nsems; /* no. of semaphores in array */
  39. };
  40. /* The user should define a union like the following to use it for arguments
  41. for `semctl'.
  42. union semun
  43. {
  44. int val; <= value for SETVAL
  45. struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
  46. unsigned short int *array; <= array for GETALL & SETALL
  47. struct seminfo *__buf; <= buffer for IPC_INFO
  48. };
  49. Previous versions of this file used to define this union but this is
  50. incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
  51. one must define the union or not. */
  52. #define _SEM_SEMUN_UNDEFINED 1
  53. #ifdef __USE_MISC
  54. /* ipcs ctl cmds */
  55. # define SEM_STAT 18
  56. # define SEM_INFO 19
  57. struct seminfo
  58. {
  59. int semmap;
  60. int semmni;
  61. int semmns;
  62. int semmnu;
  63. int semmsl;
  64. int semopm;
  65. int semume;
  66. int semusz;
  67. int semvmx;
  68. int semaem;
  69. };
  70. #endif /* __USE_MISC */