From: Robert Luberda <robert@debian.org>
Date: Tue, 18 Jun 2002 22:58:00 +0200
Subject: 16 Stdin not a tty

Return from grabh() if stdin is not a terminal.
This fixes the `-I' option (closes: #149005).
---
 tty.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tty.c b/tty.c
index 4f7057b..ab10bdb 100644
--- a/tty.c
+++ b/tty.c
@@ -85,6 +85,10 @@ grabh(struct header *hp, int gflags)
 	char *s;
 	int error;
 
+	/* do nothing if not on tty, see Debian Bug #149005 */
+	if (!isatty(0))
+	    return 0;
+
 	sigemptyset(&act.sa_mask);
 	act.sa_flags = SA_RESTART;
 	act.sa_handler = SIG_DFL;