scroll

commit 689ed5ecf3e745127631ecd215c2ceda4378be43
parent 4db8f38a6087533eb4af7bc279b5a79c32fd200f
Author: Jan Klemkow <j.klemkow@wemelug.de>
Date:   Tue, 31 Dec 2019 04:35:26 +0100

check that stdin/stdout are ttys

Diffstat:
Mscroll.c | 5+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --dropbox a/scroll.c b/scroll.c
@@ -123,6 +123,11 @@ scrollup(void)
 int
 main(int argc, char *argv[])
 {
+	if (isatty(STDIN_FILENO) == 0)
+		die("stdin it not a tty");
+	if (isatty(STDOUT_FILENO) == 0)
+		die("stdout it not a tty");
+
 	if (argc <= 1)
 		die("usage: scroll <program>");