From 1a51e46e4a87e1cd9528ac5e5656011636e4086b Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Fri, 12 Jan 2018 08:18:30 +0100
Subject: support: Preserve errno in write_message, TEST_VERIFY and other
 checks

These facilities could clobber errno, which makes it difficult to write
certain checks because a specific order has to be used.
---
 support/write_message.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'support/write_message.c')

diff --git a/support/write_message.c b/support/write_message.c
index 9d0f267..a3e2f90 100644
--- a/support/write_message.c
+++ b/support/write_message.c
@@ -18,12 +18,15 @@
 
 #include <support/support.h>
 
+#include <errno.h>
 #include <string.h>
 #include <unistd.h>
 
 void
 write_message (const char *message)
 {
+  int saved_errno = errno;
   ssize_t unused __attribute__ ((unused));
   unused = write (STDOUT_FILENO, message, strlen (message));
+  errno = saved_errno;
 }
-- 
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