From e295f483d975d7e926bb5a2527aeab10c150dd4c Mon Sep 17 00:00:00 2001
From: Oswald Buddenhagen <ossi@users.sf.net>
Date: Fri, 1 Jan 2021 14:46:31 +0100
Subject: [PATCH] save errno in sys_error()

the print functions prior to perror() might otherwise clobber it.
---
 src/util.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/util.c b/src/util.c
index 7f8c453..dd6b12c 100644
--- a/src/util.c
+++ b/src/util.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <errno.h>
 #include <string.h>
 #include <ctype.h>
 #include <pwd.h>
@@ -154,9 +155,11 @@ vsys_error( const char *msg, va_list va )
 {
 	char buf[1024];
 
+	int errno_bak = errno;
 	flushn();
 	if ((uint)vsnprintf( buf, sizeof(buf), msg, va ) >= sizeof(buf))
 		oob();
+	errno = errno_bak;
 	perror( buf );
 }