sigprocmask.c 1.9 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061
  1. /* Copyright (C) 1993, 1995, 1997, 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by David Mosberger (davidm@azstarnet.com).
  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 <features.h>
  17. #include <errno.h>
  18. #include <sys/syscall.h>
  19. #include <signal.h>
  20. /* When there is kernel support for more than 64 signals, we'll have to
  21. switch to a new system call convention here. */
  22. static inline _syscall2(int, osf_sigprocmask, int, how, unsigned long int, setval);
  23. libc_hidden_proto(sigprocmask)
  24. int
  25. sigprocmask (int how, const sigset_t *set, sigset_t *oset)
  26. {
  27. unsigned long int setval;
  28. long result;
  29. if (set)
  30. setval = set->__val[0];
  31. else
  32. {
  33. setval = 0;
  34. how = SIG_BLOCK; /* ensure blocked mask doesn't get changed */
  35. }
  36. result = osf_sigprocmask(how, setval);
  37. if (result == -1)
  38. /* If there are ever more than 63 signals, we need to recode this
  39. in assembler since we wouldn't be able to distinguish a mask of
  40. all 1s from -1, but for now, we're doing just fine... */
  41. return result;
  42. if (oset)
  43. {
  44. oset->__val[0] = result;
  45. result = _SIGSET_NWORDS;
  46. while (--result > 0)
  47. oset->__val[result] = 0;
  48. }
  49. return 0;
  50. }
  51. libc_hidden_def(sigprocmask)