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- /* Copyright (C) 1994 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <hurd/signal.h>
-
- /* Initialize PREEMPTER with the information given and stick it in the
- chain of preempters for SIGNO. */
-
- int
- hurd_preempt_signals (struct hurd_signal_preempt *preempter,
- int signo, int first_code, int last_code,
- sighandler_t (*handler) (thread_t, int, int))
- {
- if (signo <= 0 || signo >= NSIG)
- {
- errno = EINVAL;
- return -1;
- }
- preempter->first = first_code;
- preempter->last = last_code;
- preempter->handler = handler;
- __mutex_lock (&_hurd_signal_preempt_lock);
- preempter->next = _hurd_signal_preempt[signo];
- _hurd_signal_preempt[signo] = preempter;
- __mutex_unlock (&_hurd_signal_preempt_lock);
- return 0;
- }
-
- /* Remove PREEMPTER from the chain for SIGNO. */
-
- int
- hurd_unpreempt_signals (struct hurd_signal_preempt *preempter, int signo)
- {
- struct hurd_signal_preempt *p, *lastp;
- if (signo <= 0 || signo >= NSIG)
- {
- errno = EINVAL;
- return -1;
- }
- __mutex_lock (&_hurd_signal_preempt_lock);
- for (p = _hurd_signal_preempt[signo], lastp = NULL;
- p != NULL; lastp = p, p = p->next)
- if (p == preempter)
- {
- (lastp == NULL ? _hurd_signal_preempt[signo] : lastp->next) = p->next;
- __mutex_unlock (&_hurd_signal_preempt_lock);
- return 0;
- }
- _hurd_signal_preempt[signo] = preempter;
- __mutex_unlock (&_hurd_signal_preempt_lock);
- errno = ENOENT;
- return -1;
- }
-