sigpause.c 2.3 KB

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  1. /* Copyright (C) 1991,92,94-98,2000,2002,2003,2004
  2. Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  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. #define __UCLIBC_HIDE_DEPRECATED__
  17. /* psm: need the BSD version of sigpause here */
  18. #include <errno.h>
  19. #define __FAVOR_BSD
  20. #include <signal.h>
  21. #include <stddef.h> /* For NULL. */
  22. #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  23. #include <sysdep-cancel.h>
  24. #endif
  25. #include "sigset-cvt-mask.h"
  26. /* Set the mask of blocked signals to MASK,
  27. wait for a signal to arrive, and then restore the mask. */
  28. int __sigpause (int sig_or_mask, int is_sig)
  29. {
  30. sigset_t set;
  31. if (is_sig)
  32. {
  33. /* The modern X/Open implementation is requested. */
  34. sigprocmask (SIG_BLOCK, NULL, &set);
  35. /* Bound-check sig_or_mask, remove it from the set. */
  36. if (sigdelset (&set, sig_or_mask) < 0)
  37. return -1;
  38. }
  39. else
  40. sigset_set_old_mask (&set, sig_or_mask);
  41. /* Note the sigpause() is a cancellation point. But since we call
  42. sigsuspend() which itself is a cancellation point we do not have
  43. to do anything here. */
  44. return sigsuspend (&set);
  45. }
  46. libc_hidden_def(__sigpause)
  47. #undef sigpause
  48. /* We have to provide a default version of this function since the
  49. standards demand it. The version which is a bit more reasonable is
  50. the BSD version. So make this the default. */
  51. int sigpause (int mask)
  52. {
  53. #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  54. if (SINGLE_THREAD_P)
  55. return __sigpause (mask, 0);
  56. int oldtype = LIBC_CANCEL_ASYNC ();
  57. int result = __sigpause (mask, 0);
  58. LIBC_CANCEL_RESET (oldtype);
  59. return result;
  60. #else
  61. return __sigpause (mask, 0);
  62. #endif
  63. }