sem_unlink.c 1.9 KB

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  1. /* Copyright (C) 2002, 2004 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
  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 <semaphore.h>
  18. #include <stdlib.h>
  19. #include <string.h>
  20. #include <unistd.h>
  21. #include "semaphoreP.h"
  22. int
  23. sem_unlink (
  24. const char *name)
  25. {
  26. char *fname;
  27. size_t namelen;
  28. /* Determine where the shmfs is mounted. */
  29. INTUSE(__pthread_once) (&__namedsem_once, __where_is_shmfs);
  30. /* If we don't know the mount points there is nothing we can do. Ever. */
  31. if (mountpoint.dir == NULL)
  32. {
  33. __set_errno (ENOSYS);
  34. return -1;
  35. }
  36. /* Construct the filename. */
  37. while (name[0] == '/')
  38. ++name;
  39. if (name[0] == '\0')
  40. {
  41. /* The name "/" is not supported. */
  42. __set_errno (ENOENT);
  43. return -1;
  44. }
  45. namelen = strlen (name);
  46. /* Create the name of the file. */
  47. fname = (char *) alloca (mountpoint.dirlen + namelen + 1);
  48. mempcpy (mempcpy (fname, mountpoint.dir, mountpoint.dirlen),
  49. name, namelen + 1);
  50. /* Now try removing it. */
  51. int ret = unlink (fname);
  52. if (ret < 0 && errno == EPERM)
  53. __set_errno (EACCES);
  54. return ret;
  55. }