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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /hurd/preempt-sig.c
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initial import
Diffstat (limited to 'hurd/preempt-sig.c')
-rw-r--r--hurd/preempt-sig.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/hurd/preempt-sig.c b/hurd/preempt-sig.c
new file mode 100644
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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, long 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;
+}