Add a -D flag to ask tmux not to daemonize, useful both for running a

debugger (lldb does not have follow-fork-mode) and for running with a
managed supervisor init system. GitHub issue 2190.

1 files changed, 13 insertions, 2 deletions

diff --git a/server-client.c b/server-client.c
index 0bd00fc4..f42c9843 100644
--- a/server-client.c
+++ b/server-client.c
@@ -238,11 +238,22 @@ server_client_create(int fd)
 int
 server_client_open(struct client *c, char **cause)
 {
+	const char	*ttynam = _PATH_TTY;
+
 	if (c->flags & CLIENT_CONTROL)
 		return (0);
 
-	if (strcmp(c->ttyname, "/dev/tty") == 0) {
-		*cause = xstrdup("can't use /dev/tty");
+	if (strcmp(c->ttyname, ttynam) == 0||
+	    ((isatty(STDIN_FILENO) &&
+	    (ttynam = ttyname(STDIN_FILENO)) != NULL &&
+	    strcmp(c->ttyname, ttynam) == 0) ||
+	    (isatty(STDOUT_FILENO) &&
+	    (ttynam = ttyname(STDOUT_FILENO)) != NULL &&
+	    strcmp(c->ttyname, ttynam) == 0) ||
+	    (isatty(STDERR_FILENO) &&
+	    (ttynam = ttyname(STDERR_FILENO)) != NULL &&
+	    strcmp(c->ttyname, ttynam) == 0))) {
+		xasprintf(cause, "can't use %s", c->ttyname);
 		return (-1);
 	}