start: non-functional changes

src/lxc/conf.c

@@ -3010,7 +3010,7 @@ static int lxc_send_ttys_to_parent(struct lxc_handler *handler)
 	struct lxc_pty_info *pty_info;
 	struct lxc_conf *conf = handler->conf;
 	const struct lxc_tty_info *tty_info = &conf->tty_info;
-	int sock = handler->ttysock[0];
+	int sock = handler->data_sock[0];
 	int ret = -1;
 	size_t num_ttyfds = (2 * conf->tty);
 
@@ -3034,8 +3034,8 @@ static int lxc_send_ttys_to_parent(struct lxc_handler *handler)
 	else
 		TRACE("sent %d ttys to parent", conf->tty);
 
-	close(handler->ttysock[0]);
-	close(handler->ttysock[1]);
+	close(handler->data_sock[0]);
+	close(handler->data_sock[1]);
 
 	for (i = 0; i < num_ttyfds; i++)
 		close(ttyfds[i]);

src/lxc/start.c

@@ -532,7 +532,7 @@ struct lxc_handler *lxc_init_handler(const char *name, struct lxc_conf *conf,
 
 	memset(handler, 0, sizeof(*handler));
 
-	handler->ttysock[0] = handler->ttysock[1] = -1;
+	handler->data_sock[0] = handler->data_sock[1] = -1;
 	handler->conf = conf;
 	handler->lxcpath = lxcpath;
 	handler->pinfd = -1;
@@ -756,9 +756,9 @@ void lxc_fini(const char *name, struct lxc_handler *handler)
 		free(cur);
 	}
 
-	if (handler->ttysock[0] != -1) {
-		close(handler->ttysock[0]);
-		close(handler->ttysock[1]);
+	if (handler->data_sock[0] != -1) {
+		close(handler->data_sock[0]);
+		close(handler->data_sock[1]);
 	}
 
 	if (handler->conf->ephemeral == 1 && handler->conf->reboot != 1)
@@ -1193,7 +1193,7 @@ static int lxc_recv_ttys_from_child(struct lxc_handler *handler)
 	int *ttyfds;
 	struct lxc_pty_info *pty_info;
 	int ret = -1;
-	int sock = handler->ttysock[1];
+	int sock = handler->data_sock[1];
 	struct lxc_conf *conf = handler->conf;
 	struct lxc_tty_info *tty_info = &conf->tty_info;
 	size_t num_ttyfds = (2 * conf->tty);
@@ -1266,7 +1266,7 @@ void resolve_clone_flags(struct lxc_handler *handler)
  */
 static int lxc_spawn(struct lxc_handler *handler)
 {
-	int i, flags, nveths;
+	int i, flags, nveths, ret;
 	const char *name = handler->name;
 	bool wants_to_map_ids;
 	int netpipepair[2], saved_ns_fd[LXC_NS_MAX];
@@ -1285,7 +1285,8 @@ static int lxc_spawn(struct lxc_handler *handler)
 	if (lxc_sync_init(handler))
 		return -1;
 
-	if (socketpair(AF_UNIX, SOCK_DGRAM, 0, handler->ttysock) < 0) {
+	ret = socketpair(AF_UNIX, SOCK_DGRAM, 0, handler->data_sock);
+	if (ret < 0) {
 		lxc_sync_fini(handler);
 		return -1;
 	}

src/lxc/start.h

@@ -48,13 +48,17 @@ struct lxc_handler {
 	int pinfd;
 	const char *lxcpath;
 	void *cgroup_data;
-	int ttysock[2]; // socketpair for child->parent tty fd passing
-	bool backgrounded; // indicates whether should we close std{in,out,err} on start
+
+	/* Abstract unix domain SOCK_DGRAM socketpair to pass arbitrary data
+	 * between child and parent.
+	 */
+	int data_sock[2];
+
+	/* indicates whether should we close std{in,out,err} on start */
+	bool backgrounded;
 	int nsfd[LXC_NS_MAX];
 	int netnsfd;
-	/* The socketpair() fds used to wait on successful daemonized
-	 * startup.
-	 */
+	/* The socketpair() fds used to wait on successful daemonized startup. */
 	int state_socket_pair[2];
 	struct lxc_list state_clients;
 };