Check recv() return value.

1 files changed, 5 insertions, 2 deletions

diff --git a/emergencyc.pl b/emergencyc.pl
index 86c9da7..5d59be1 100755
--- a/emergencyc.pl
+++ b/emergencyc.pl
@@ -77,10 +77,13 @@ eval {
     alarm 5;
     do {
 	$sender = recv($socket, $buf, 16384, 0);
-    } while ( $sender ne $haddr );
+    } while ( defined($sender) && $sender ne $haddr );
 };
 if ( $@ ) {
-    printf "timeout\n";
+    print "timeout\n";
+    exit 1;
+} elsif ( !defined($sender) ) {
+    die "Failed to receive packet: $!";
 } else {
     printf "%s", $buf;
 }