Use sigaction() to have a consistent behavior across systems for signals.

src/system.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 Nikos Mavrogiannopoulos
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <config.h>
+#include <system.h>
+#include <unistd.h>
+#ifdef __linux__
+# include <sys/prctl.h>
+#endif
+
+void kill_on_parent_kill(int sig)
+{
+#ifdef __linux__
+	prctl(PR_SET_PDEATHSIG, sig);
+#endif
+}
+
+sighandler_t ocsignal(int signum, sighandler_t handler)
+{
+	struct sigaction new_action, old_action;
+	
+	new_action.sa_handler = handler;
+	sigemptyset (&new_action.sa_mask);
+	new_action.sa_flags = 0;
+	
+	sigaction (signum, &new_action, &old_action);
+	return old_action.sa_handler;
+}