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