From dec3392af2c5eff92c9dd702bd324feafc979d3f Mon Sep 17 00:00:00 2001
From: Tristan Riehs <tristan.riehs@bordeaux-inp.fr>
Date: Sat, 11 Nov 2023 20:49:39 +0100
Subject: stdin copied only if it contains data

---
 rpt.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/rpt.c b/rpt.c
index 327b8b8..c72aeab 100644
--- a/rpt.c
+++ b/rpt.c
@@ -3,6 +3,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
+#include <poll.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
@@ -225,7 +226,18 @@ main(int argc, char* argv[])
 		return 3;
 	}
 
-	copy_stdin();
+	struct pollfd pollfd = {.fd=STDIN_FILENO, .events=POLLIN, .revents=0};
+
+	if (poll(&pollfd, 1, 0) < 0)
+	{
+		fclose(stdin_clone);
+		perror("poll");
+		return 4;
+	}
+
+	if (pollfd.revents & POLLIN)
+		copy_stdin();
+
 	repeat_cmd(argv + optind, count, handle_error_f);
 
 	fclose(stdin_clone);
-- 
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