diff options
| -rw-r--r-- | loginutils/getty.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/loginutils/getty.c b/loginutils/getty.c index 230846008..3496f0284 100644 --- a/loginutils/getty.c +++ b/loginutils/getty.c @@ -556,10 +556,12 @@ int getty_main(int argc UNUSED_PARAM, char **argv) * In this case (setsid failed) we may still have ctty, * and it may be different from tty we need to control! * If we still have ctty, on Linux ioctl(TIOCSCTTY) - * (which we are going to call a bit later) always fails. - * Try to drop ctty now to prevent that. + * (which we are going to use a bit later) always fails - + * even if we try to take ctty which is already ours! + * Try to drop old ctty now to prevent that. + * Use O_NONBLOCK: old ctty may be a serial line. */ - fd = open("/dev/tty", O_RDWR); + fd = open("/dev/tty", O_RDWR | O_NONBLOCK); if (fd >= 0) { ioctl(fd, TIOCNOTTY); close(fd); |