tst-sem8.c 1.7 KB

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  1. /* Copyright (C) 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the 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. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <errno.h>
  17. #include <fcntl.h>
  18. #include <semaphore.h>
  19. #include <stdio.h>
  20. #include <stdlib.h>
  21. #include <unistd.h>
  22. static void
  23. remove_sem (int status, void *arg)
  24. {
  25. sem_unlink (arg);
  26. }
  27. int
  28. main (void)
  29. {
  30. sem_t *s;
  31. int i;
  32. on_exit (remove_sem, (void *) "/glibc-tst-sem8");
  33. for (i = 0; i < 3; ++i)
  34. {
  35. s = sem_open ("/glibc-tst-sem8", O_CREAT, 0600, 1);
  36. if (s == SEM_FAILED)
  37. {
  38. if (errno == ENOSYS)
  39. {
  40. puts ("sem_open not supported. Oh well.");
  41. return 0;
  42. }
  43. /* Maybe the shm filesystem has strict permissions. */
  44. if (errno == EACCES)
  45. {
  46. puts ("sem_open not allowed. Oh well.");
  47. return 0;
  48. }
  49. printf ("sem_open: %m\n");
  50. return 1;
  51. }
  52. /* Now close the handle. */
  53. if (sem_close (s) != 0)
  54. {
  55. puts ("sem_close failed");
  56. return 1;
  57. }
  58. }
  59. return 0;
  60. }