getty: fix for NOCTTY killing us with SIGHUP

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/loginutils/getty.c b/loginutils/getty.c
index afb411b98..bbb5a96b4 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -561,8 +561,14 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
                  */
                 fd = open("/dev/tty", O_RDWR | O_NONBLOCK);
                 if (fd >= 0) {
+                        /* TIOCNOTTY sends SIGHUP to the foreground
+                         * process group - which may include us!
+                         * Make sure to not die on it:
+                         */
+                        sighandler_t old = signal(SIGHUP, SIG_IGN);
                         ioctl(fd, TIOCNOTTY);
                         close(fd);
+                        signal(SIGHUP, old);
                 }
         }