exec: make sure O_NONBLOCK is off for all sockets passed as STDIN/STDOUT/STDERR

1 files changed, 5 insertions, 0 deletions

diff --git a/src/execute.c b/src/execute.c
index f35e916e4c..2443d9c74d 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -1038,6 +1038,11 @@ int exec_spawn(ExecCommand *command,
                                 goto fail;
                 }
 
+                /* If a socket is connected to STDIN/STDOUT/STDERR, we
+                 * must sure to drop O_NONBLOCK */
+                if (socket_fd >= 0)
+                        fd_nonblock(socket_fd, false);
+
                 if (!keep_stdin)
                         if (setup_input(context, socket_fd, apply_tty_stdin) < 0) {
                                 r = EXIT_STDIN;