sem.c 3.0 KB

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  1. /* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. #include <errno.h>
  17. #include <sys/sem.h>
  18. #include <stddef.h>
  19. #include <stdlib.h> /* for NULL */
  20. #include "ipc.h"
  21. #ifdef L_semctl
  22. /* Return identifier for array of NSEMS semaphores associated with
  23. KEY. */
  24. #include <stdarg.h>
  25. /* arg for semctl system calls. */
  26. union semun {
  27. int val; /* value for SETVAL */
  28. struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
  29. unsigned short *array; /* array for GETALL & SETALL */
  30. struct seminfo *__buf; /* buffer for IPC_INFO */
  31. void *__pad;
  32. };
  33. #ifdef __NR_semctl
  34. #define __NR___semctl __NR_semctl
  35. static __inline__ _syscall4(int, __semctl, int, semid, int, semnum, int, cmd, void *, arg)
  36. #endif
  37. int semctl(int semid, int semnum, int cmd, ...)
  38. {
  39. union semun arg;
  40. va_list ap;
  41. /* Get the argument. */
  42. va_start (ap, cmd);
  43. arg = va_arg (ap, union semun);
  44. va_end (ap);
  45. #ifdef __NR_semctl
  46. return __semctl(semid, semnum, cmd | __IPC_64, arg.__pad);
  47. #else
  48. return __syscall_ipc(IPCOP_semctl, semid, semnum, cmd|__IPC_64, &arg, NULL);
  49. #endif
  50. }
  51. #endif
  52. #ifdef L_semget
  53. #ifdef __NR_semget
  54. _syscall3(int, semget, key_t, key, int, nsems, int, semflg)
  55. #else
  56. /* Return identifier for array of NSEMS semaphores associated
  57. * with KEY. */
  58. int semget (key_t key, int nsems, int semflg)
  59. {
  60. return __syscall_ipc(IPCOP_semget, key, nsems, semflg, NULL, 0);
  61. }
  62. #endif
  63. #endif
  64. #ifdef L_semop
  65. #ifdef __NR_semop
  66. _syscall3(int, semop, int, semid, struct sembuf *, sops, size_t, nsops)
  67. #else
  68. /* Perform user-defined atomical operation of array of semaphores. */
  69. int semop (int semid, struct sembuf *sops, size_t nsops)
  70. {
  71. return __syscall_ipc(IPCOP_semop, semid, (int) nsops, 0, sops, NULL);
  72. }
  73. #endif
  74. #endif
  75. #ifdef L_semtimedop
  76. #ifdef __NR_semtimedop
  77. _syscall4(int, semtimedop, int, semid, struct sembuf *, sops, size_t, nsops, const struct timespec *, timeout)
  78. #else
  79. int semtimedop(int semid, struct sembuf *sops, size_t nsops,
  80. const struct timespec *timeout)
  81. {
  82. return __syscall_ipc(IPCOP_semtimedop, semid, nsops, 0, sops, (void *) timeout);
  83. }
  84. #endif
  85. #endif