lib: Don't wait in igt_wait_for_keypress() if stdin is not a tty

When running in a non interactive terminal, there's little point in
trying to wait for some input on stdin.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/drmtest.c b/lib/drmtest.c
index 24362bd4..28651cee 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -1710,6 +1710,9 @@ void igt_wait_for_keypress(void)
 {
 	struct termios oldt, newt;
 
+	if (!isatty(STDIN_FILENO))
+		return;
+
 	tcgetattr ( STDIN_FILENO, &oldt );
 	newt = oldt;
 	newt.c_lflag &= ~( ICANON | ECHO );