Do not attempt to connect to the socket as a client if systemd is active, from

Julien Moutinho in GitHub issue 3345.

3 files changed, 13 insertions, 0 deletions

diff --git a/client.c b/client.c
index df6cee94..7f712ffb 100644
--- a/client.c
+++ b/client.c
@@ -284,6 +284,12 @@ client_main(struct event_base *base, int argc, char **argv, uint64_t flags,
 	log_debug("flags are %#llx", (unsigned long long)client_flags);
 
 	/* Initialize the client socket and start the server. */
+#ifdef HAVE_SYSTEMD
+	if (systemd_activated()) {
+		/* socket-based activation, do not even try to be a client. */
+		fd = server_start(client_proc, flags, base, 0, NULL);
+	} else
+#endif
 	fd = client_connect(base, socket_path, client_flags);
 	if (fd == -1) {
 		if (errno == ECONNREFUSED) {
diff --git a/compat.h b/compat.h
index 6eb97619..aefc0d38 100644
--- a/compat.h
+++ b/compat.h
@@ -423,6 +423,7 @@ void		*recallocarray(void *, size_t, size_t, size_t);
 
 #ifdef HAVE_SYSTEMD
 /* systemd.c */
+int		 systemd_activated(void);
 int		 systemd_create_socket(int, char **);
 #endif
 
diff --git a/compat/systemd.c b/compat/systemd.c
index 9a3adbb3..cce42ed4 100644
--- a/compat/systemd.c
+++ b/compat/systemd.c
@@ -26,6 +26,12 @@
 #include "tmux.h"
 
 int
+systemd_activated(void)
+{
+	return (sd_listen_fds(0) >= 1);
+}
+
+int
 systemd_create_socket(int flags, char **cause)
 {
 	int			fds;