uterm: vt: be more verbose on errors

Print more information when VT allocation fails.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

diff --git a/src/uterm_vt.c b/src/uterm_vt.c
index 2463647..2e53d58 100644 (file)
--- a/src/uterm_vt.c
+++ b/src/uterm_vt.c
@@ -162,7 +162,7 @@ static void real_input(struct ev_fd *fd, int mask, void *data)
 
 static int open_tty(int id, int *tty_fd, int *tty_num)
 {
-       int fd;
+       int fd, err1;
        char filename[16];
 
        if (!tty_fd || !tty_num)
@@ -171,10 +171,12 @@ static int open_tty(int id, int *tty_fd, int *tty_num)
        if (id < 0) {
                fd = open("/dev/tty0", O_NONBLOCK | O_NOCTTY | O_CLOEXEC);
                if (fd < 0) {
+                       err1 = errno;
                        fd = open("/dev/tty1",
                                        O_NONBLOCK | O_NOCTTY | O_CLOEXEC);
                        if (fd < 0) {
-                               log_err("cannot find parent tty");
+                               log_err("cannot find parent tty (%d, %d): %m",
+                                       err1, errno);
                                return -errno;
                        }
                }