sigintr.c 1.7 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 <stddef.h>
  16. #include <signal.h>
  17. #include <errno.h>
  18. libc_hidden_proto(sigaction)
  19. /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
  20. (causing them to fail with EINTR); if INTERRUPT is zero, make system
  21. calls be restarted after signal SIG. */
  22. #ifdef SA_RESTART
  23. extern sigset_t _sigintr attribute_hidden; /* Defined in signal.c. */
  24. #endif
  25. int
  26. siginterrupt (sig, interrupt)
  27. int sig;
  28. int interrupt;
  29. {
  30. #ifdef SA_RESTART
  31. struct sigaction action;
  32. if (sigaction (sig, (struct sigaction *) NULL, &action) < 0)
  33. return -1;
  34. if (interrupt)
  35. {
  36. __sigaddset (&_sigintr, sig);
  37. action.sa_flags &= ~SA_RESTART;
  38. }
  39. else
  40. {
  41. __sigdelset (&_sigintr, sig);
  42. action.sa_flags |= SA_RESTART;
  43. }
  44. if (sigaction (sig, &action, (struct sigaction *) NULL) < 0)
  45. return -1;
  46. return 0;
  47. #else
  48. __set_errno (ENOSYS);
  49. return -1;
  50. #endif
  51. }