From cb46f47c7969b619d1b2547d06a75ad5b375eda9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Thu, 4 May 2023 17:26:59 +0000
Subject: [PATCH] tsort: Error out if writing to stdout failed.

MFC after:	1 week
Sponsored by:	Klara, Inc.
Reviewed by:	kevans, imp
Differential Revision:	https://reviews.freebsd.org/D39959
---
 usr.bin/tsort/tsort.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/usr.bin/tsort/tsort.c b/usr.bin/tsort/tsort.c
index 58492b26999c..b2dbe9beb799 100644
--- a/usr.bin/tsort/tsort.c
+++ b/usr.bin/tsort/tsort.c
@@ -183,6 +183,8 @@ main(int argc, char *argv[])
 
 	/* do the sort */
 	tsort();
+        if (ferror(stdout) != 0 || fflush(stdout) != 0)
+                err(1, "stdout");
 	exit(0);
 }