From c950ceccea358660532684ced9c3bb3b7159d09d Mon Sep 17 00:00:00 2001
From: Ramon Novoa <ramonnovoa@gmail.com>
Date: Thu, 15 Feb 2018 13:24:27 +0100
Subject: [PATCH] Return -1 when socket_can_read times out.

0 is a valid file descriptor. Use -1 instead to signal a timeout.
---
 src/fping.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/fping.c b/src/fping.c
index 2a885e4..d4d112f 100644
--- a/src/fping.c
+++ b/src/fping.c
@@ -1716,7 +1716,7 @@ select_again:
 #endif
     }
 
-    return 0;
+    return -1;
 }
 
 int receive_packet(int socket,
@@ -2005,7 +2005,7 @@ int wait_for_reply(long wait_time)
         to.tv_usec = 0;
     }
     s = socket_can_read(&to);
-    if (s == 0) {
+    if (s == -1) {
         return 0; /* timeout */
     }