getty: more correct check for O_RDWR

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

diff --git a/loginutils/getty.c b/loginutils/getty.c
index 94c9147abebc3786592f1d66efd69e74d3b01242..015f077d6135d958c6de341422a5cbcae9c9d64d 100644 (file)
--- 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");
        }
 }