Unlink socket when server is killed

abduco.c

@@ -251,6 +251,7 @@ static bool create_session(const char *name, char * const argv[]) {
 				break;
 			default:
 				/* SIGTTIN, SIGTTU */
+				sa.sa_handler = server_sigterm_handler;
 				sigaction(SIGTERM, &sa, NULL);
 				sigaction(SIGINT, &sa, NULL);
 				sa.sa_handler = SIG_IGN;

server.c

@@ -126,6 +126,10 @@ static void server_pty_died_handler(int sig) {
 	errno = errsv;
 }
 
+static void server_sigterm_handler(int sig) {
+	exit(EXIT_FAILURE); /* invoke atexit handler */
+}
+
 static void server_atexit_handler() {
 	unlink(sockaddr.sun_path);
 }