Only check if stdin is a tty once

1 files changed, 2 insertions, 1 deletions

diff --git a/qarsh.c b/qarsh.c
index 6d02762..c713380 100644
--- a/qarsh.c
+++ b/qarsh.c
@@ -193,6 +193,7 @@ run_remote_cmd(char *cmdline)
 	int nbytes;
 	struct timespec timeout;
 	short cmd_finished;
+	short stdin_isatty = isatty(fileno(stdin));
 
 	qp = make_qp_runcmd(cmdline);
 	send_packet(qarsh_fd, qp);
@@ -225,7 +226,7 @@ run_remote_cmd(char *cmdline)
 		/* allowed_in is set to -1 when stdin is closed */
 		if (allowed_in != -1) {
 			/* close stdin if it is a tty */
-			if (isatty(fileno(stdin))) {
+			if (stdin_isatty) {
 				qp = make_qp_data(0, 0, 0, NULL);
 				send_packet(qarsh_fd, qp);
 				qpfree(qp);