tst-sem8.c 1.7 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273
  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, see
  14. <http://www.gnu.org/licenses/>. */
  15. #include <errno.h>
  16. #include <fcntl.h>
  17. #include <semaphore.h>
  18. #include <stdio.h>
  19. #include <stdlib.h>
  20. #include <unistd.h>
  21. static void
  22. remove_sem (int status, void *arg)
  23. {
  24. sem_unlink (arg);
  25. }
  26. int
  27. main (void)
  28. {
  29. sem_t *s;
  30. int i;
  31. on_exit (remove_sem, (void *) "/glibc-tst-sem8");
  32. for (i = 0; i < 3; ++i)
  33. {
  34. s = sem_open ("/glibc-tst-sem8", O_CREAT, 0600, 1);
  35. if (s == SEM_FAILED)
  36. {
  37. if (errno == ENOSYS)
  38. {
  39. puts ("sem_open not supported. Oh well.");
  40. return 0;
  41. }
  42. /* Maybe the shm filesystem has strict permissions. */
  43. if (errno == EACCES)
  44. {
  45. puts ("sem_open not allowed. Oh well.");
  46. return 0;
  47. }
  48. printf ("sem_open: %m\n");
  49. return 1;
  50. }
  51. /* Now close the handle. */
  52. if (sem_close (s) != 0)
  53. {
  54. puts ("sem_close failed");
  55. return 1;
  56. }
  57. }
  58. return 0;
  59. }