getty: more correct check for O_RDWR

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

1 files changed, 1 insertions, 1 deletions

diff --git a/loginutils/getty.c b/loginutils/getty.c
index 94c9147ab..015f077d6 100644
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -268,7 +268,7 @@ static void open_tty(const char *tty)
                  * Standard input should already be connected to an open port. Make
                  * sure it is open for read/write.
                  */
-                if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
+                if ((fcntl(0, F_GETFL) & (O_RDWR|O_RDONLY|O_WRONLY)) != O_RDWR)
                         bb_error_msg_and_die("stdin is not open for read/write");
         }
 }