1 files changed, 68 insertions, 0 deletions
diff --git a/hurd/preempt-sig.c b/hurd/preempt-sig.c
new file mode 100644
index 0000000000..86761967cc
--- /dev/null
+++ b/hurd/preempt-sig.c
@@ -0,0 +1,68 @@
+/* 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;
+}