--- ping.c	2013-07-23 11:02:26.364843595 +0200
+++ ping.c	2013-07-23 11:02:32.740900627 +0200
@@ -129,6 +129,16 @@
 	cap_t caps;
 #endif
 
+	/*
+	* ping depend on SIGALARM to exit sometimes,
+	* but to popen, system, fork carry on parent signal handler
+	* so we mask it ourself.
+	*/
+	sigset_t s;
+	sigaddset(&s, SIGALRM);
+	sigprocmask(SIG_UNBLOCK, &s, NULL);
+	set_signal(SIGALRM, doexit);
+
 	icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 	socket_errno = errno;