initial import

sysdeps/posix/sigsuspend.c

@@ -0,0 +1,51 @@
+/* Copyright (C) 1991 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 <ansidecl.h>
+#include <errno.h>
+#include <signal.h>
+#include <stddef.h>
+#include <unistd.h>
+
+
+/* Change the set of blocked signals to SET,
+   wait until a signal arrives, and restore the set of blocked signals.  */
+int
+DEFUN(sigsuspend, (set), CONST sigset_t *set)
+{
+  sigset_t oset;
+  int save;
+
+  if (set == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  if (sigprocmask(SIG_SETMASK, set, &oset) < 0)
+    return -1;
+
+  (void) pause();
+  save = errno;
+
+  if (sigprocmask(SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
+    return -1;
+
+  errno = save;
+  return -1;
+}