From 8d54440339cd67f7d0b16f1908df77408ceab2e0 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 18 Dec 2023 10:31:45 +0100
Subject: [PATCH] Include <err.h> if available

This avoids implicit declarations of warn and warnx and compilation
failures with Clang 16 and GCC 14.

Fixes commit d89d9b15eb8ca3a6b18b ("Check return value of the
read("/dev/urandom"). Just in case.") and commit 44fea8a6a4f1de1e0cb5
("Also check if we got the amount of bytes that we expected.").
---
 pertools/udp_contention/udp_contention.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pertools/udp_contention/udp_contention.c b/pertools/udp_contention/udp_contention.c
index 2105eab1c..98566b86e 100644
--- a/pertools/udp_contention/udp_contention.c
+++ b/pertools/udp_contention/udp_contention.c
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include <sys/types.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
@@ -17,6 +19,10 @@
 #include <time.h>
 #include <unistd.h>
 
+#if HAVE_ERR_H
+#include <err.h>
+#endif
+
 #define UC_MAX_THREADS 64
 
 #if defined(__FreeBSD__)
@@ -60,8 +66,6 @@ srandomdev(void)
 # endif
 #endif
 
-#include "config.h"
-
 #include "elperiodic.h"
 
 #include "rtpp_network.h"