sigintr.c 1.5 KB

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  1. /* Copyright (C) 1992, 1994, 1996, 2002 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, see
  13. <http://www.gnu.org/licenses/>. */
  14. #include <signal.h>
  15. /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
  16. (causing them to fail with EINTR); if INTERRUPT is zero, make system
  17. calls be restarted after signal SIG. */
  18. #ifdef SA_RESTART
  19. # define __need_NULL
  20. # include <stddef.h>
  21. #else
  22. # include <errno.h>
  23. #endif
  24. int siginterrupt (int sig, int interrupt)
  25. {
  26. #ifdef SA_RESTART
  27. struct sigaction action;
  28. /* Fails if sig is bad. */
  29. if (sigaction (sig, NULL, &action) < 0)
  30. return -1;
  31. if (interrupt)
  32. {
  33. __sigaddset (&_sigintr, sig);
  34. action.sa_flags &= ~SA_RESTART;
  35. }
  36. else
  37. {
  38. __sigdelset (&_sigintr, sig);
  39. action.sa_flags |= SA_RESTART;
  40. }
  41. return sigaction (sig, &action, NULL);
  42. #else
  43. __set_errno (ENOSYS);
  44. return -1;
  45. #endif
  46. }