sighold.c 1.3 KB

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  1. /* Add SIG to the calling process' signal mask.
  2. Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public
  7. License as published by the Free Software Foundation; either
  8. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, write to the Free
  15. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  16. 02111-1307 USA. */
  17. #define __need_NULL
  18. #include <stddef.h>
  19. #include <signal.h>
  20. int sighold (int sig)
  21. {
  22. sigset_t set;
  23. /* Retrieve current signal set. */
  24. sigprocmask (SIG_SETMASK, NULL, &set); /* can't fail */
  25. /* Bound-check sig, add it to the set. */
  26. if (sigaddset (&set, sig) < 0)
  27. return -1;
  28. /* Set the new mask. */
  29. return sigprocmask (SIG_SETMASK, &set, NULL);
  30. }