close fd 0 and 1 where not required

the fd 0,1 and 2 are still inherited
and we only need the fd 2 (stderr) after
the start/restart of the application.

Signed-off-by: Michel Normand <normand@fr.ibm.com>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

src/lxc/lxc_init.c

@@ -92,6 +92,10 @@ int main(int argc, char *argv[])
 		exit(err);
 	}
 
+	/* no need of other inherited fds but stderr */
+	close(fileno(stdin));
+	close(fileno(stdout));
+
 	err = 0;
 	for (;;) {
 		int status;

src/lxc/start.c

@@ -547,6 +547,10 @@ int lxc_start(const char *name, char *const argv[], struct lxc_conf *conf)
 		goto out_fini;
 	}
 
+	/* no need of other inherited fds but stderr */
+	close(fileno(stdin));
+	close(fileno(stdout));
+
 	err = lxc_poll(name, handler);
 	if (err) {
 		ERROR("mainloop exited with an error");