1 files changed, 65 insertions, 0 deletions
diff --git a/gdb/common/signal-dispositions-save-restore.c b/gdb/common/signal-dispositions-save-restore.c
new file mode 100644
index 00000000000..422ebf22b87
--- /dev/null
+++ b/gdb/common/signal-dispositions-save-restore.c
@@ -0,0 +1,65 @@
+/* Copyright (C) 2016 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "common-defs.h"
+#include "signal-dispositions-save-restore.h"
+
+#include <signal.h>
+
+/* The original signal handlers.  */
+
+#ifdef HAVE_SIGACTION
+static sighandler_t original_signal_handlers[NSIG];
+#endif
+
+/* See signal-dispositions-save-restore.h.   */
+
+void
+save_original_signal_dispositions (void)
+{
+#ifdef HAVE_SIGACTION
+  int i;
+
+  for (i = 1; i < NSIG; i++)
+    {
+      struct sigaction oldact;
+
+      sigaction (i, NULL, &oldact);
+
+      original_signal_handlers[i] = oldact.sa_handler;
+
+      /* If we find a signal handler already installed, then this
+	 function was called too late.  */
+      if (oldact.sa_handler != SIG_DFL
+	  && oldact.sa_handler != SIG_IGN)
+	internal_error (__FILE__, __LINE__, _("unexpected signal handler"));
+    }
+#endif
+}
+
+/* See signal-dispositions-save-restore.h.   */
+
+void
+restore_original_signal_dispositions (void)
+{
+#ifdef HAVE_SIGACTION
+  int i;
+
+  for (i = 1; i < NSIG; i++)
+    signal (i, original_signal_handlers[i]);
+#endif
+}