From 0f96d32d4c9136ba330d85f444236ea3fb4414a2 Mon Sep 17 00:00:00 2001
From: Ludovic Pouzenc <ludovic@pouzenc.fr>
Date: Wed, 18 Jul 2018 10:56:06 +0200
Subject: [PATCH] Set SIGALRM handler before setting timer

---
 echoc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/echoc.c b/echoc.c
index 2e99be1..eaed4e5 100644
--- a/echoc.c
+++ b/echoc.c
@@ -174,6 +174,8 @@ main(int argc, char *argv[])
 	if (setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &ch, sizeof(ch)) < 0)
 		err(2, "setsockopt IP_MTU_DISCOVER");
 #endif
+	signal(SIGALRM, send_packet);
+
 	/* timer values */
 	itv.it_interval.tv_usec = interval*1000;
 	itv.it_interval.tv_sec = 0;
@@ -182,8 +184,6 @@ main(int argc, char *argv[])
 	if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
 		err(2, "setitimer");
 
-	signal(SIGALRM, send_packet);
-
 	gettimeofday(&last_ts, NULL);
 
 	while (1) {