Hello,
I'm adding a small fix to the suggested patch before just to avoid
messages on stderr if case of not having a controlling tty:
___BEGIN_PATCH___
--- shadow-4.1.5.1.orig/src/su.c 2013-03-29 21:52:11.930790904 +0100
+++ shadow-4.1.5.1/src/su.c 2013-03-30 13:03:49.813030646 +0100
@@ -356,7 +356,7 @@ static void prepare_close_session (void)
/* This avoids the callee to inject commands on
* the caller's tty including srappy incidents. */
ret = ioctl( STDIN_FILENO, TCFLSH, TCIFLUSH);
- if( ret == -1)
+ if( ret == -1 && errno != ENOTTY)
fprintf (stderr, _("%s: Flushing input: %s\n"), Prog, strerror(
errno));
if (0 != caught) {
___END_PATCH___
with best regards
Wolf
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