sigintr.c 1.6 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, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #include <signal.h>
  16. /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
  17. (causing them to fail with EINTR); if INTERRUPT is zero, make system
  18. calls be restarted after signal SIG. */
  19. #ifdef SA_RESTART
  20. # define __need_NULL
  21. # include <stddef.h>
  22. #else
  23. # include <errno.h>
  24. #endif
  25. int siginterrupt (int sig, int interrupt)
  26. {
  27. #ifdef SA_RESTART
  28. struct sigaction action;
  29. /* Fails if sig is bad. */
  30. if (sigaction (sig, NULL, &action) < 0)
  31. return -1;
  32. if (interrupt)
  33. {
  34. __sigaddset (&_sigintr, sig);
  35. action.sa_flags &= ~SA_RESTART;
  36. }
  37. else
  38. {
  39. __sigdelset (&_sigintr, sig);
  40. action.sa_flags |= SA_RESTART;
  41. }
  42. return sigaction (sig, &action, NULL);
  43. #else
  44. __set_errno (ENOSYS);
  45. return -1;
  46. #endif
  47. }