Merge pull request #728 from hwangcc23/init-sigaction

Properly initialize sigaction struct

skynet-src/skynet_main.c

@@ -78,6 +78,8 @@ _init_env(lua_State *L) {
 int sigign() {
 	struct sigaction sa;
 	sa.sa_handler = SIG_IGN;
+	sa.sa_flags = 0;
+	sigemptyset(&sa.sa_mask);
 	sigaction(SIGPIPE, &sa, 0);
 	return 0;
 }