sigblock.c 1.8 KB

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  1. /* Copyright (C) 1991, 94, 95, 96, 97, 98, 2001 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <errno.h>
  16. #include <signal.h>
  17. /* Block signals in MASK, returning the old mask. */
  18. int __sigblock (int mask)
  19. {
  20. register unsigned int sig;
  21. sigset_t set, oset;
  22. if (__sigemptyset (&set) < 0)
  23. return -1;
  24. if (sizeof (mask) == sizeof (set))
  25. *(int *) &set = mask;
  26. else if (sizeof (unsigned long int) == sizeof (set))
  27. *(unsigned long int *) &set = (unsigned int) mask;
  28. else
  29. for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
  30. if ((mask & sigmask (sig)) && __sigaddset (&set, sig) < 0)
  31. return -1;
  32. if (sigprocmask (SIG_BLOCK, &set, &oset) < 0)
  33. return -1;
  34. if (sizeof (mask) == sizeof (oset))
  35. mask = *(int *) &oset;
  36. else if (sizeof (unsigned long int) == sizeof (oset))
  37. mask = *(unsigned long int*) &oset;
  38. else
  39. for (sig = 1, mask = 0; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
  40. if (__sigismember (&oset, sig))
  41. mask |= sigmask (sig);
  42. return mask;
  43. }
  44. strong_alias (__sigblock, sigblock)