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  1. /* X/Open compatibility function.
  2. Copyright (C) 1991, 1992, 1996 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 Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. 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. Library General Public License for more details.
  12. You should have received a copy of the GNU Library General Public
  13. License along with the GNU C Library; see the file COPYING.LIB. If not,
  14. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  15. Boston, MA 02111-1307, USA. */
  16. #include <errno.h>
  17. #include <signal.h>
  18. sigset_t _sigintr; /* Set by siginterrupt. */
  19. /* Set the handler for the signal SIG to HANDLER,
  20. returning the old handler, or SIG_ERR on error. */
  21. __sighandler_t
  22. bsd_signal (sig, handler)
  23. int sig;
  24. __sighandler_t handler;
  25. {
  26. struct sigaction act, oact;
  27. /* Check signal extents to protect __sigismember. */
  28. if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
  29. {
  30. __set_errno (EINVAL);
  31. return SIG_ERR;
  32. }
  33. act.sa_handler = handler;
  34. if (__sigemptyset (&act.sa_mask) < 0)
  35. return SIG_ERR;
  36. act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;
  37. if (__sigaction (sig, &act, &oact) < 0)
  38. return SIG_ERR;
  39. return oact.sa_handler;
  40. }