stdin copied only if it contains data

1 files changed, 13 insertions, 1 deletions

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);