When interval is set to very small value with limited amount of packets,

ping6(8) would quit before the remote side gets a chance to respond.

Solve this by resetting the itimer when we have reached the maximum packet
number have reached, but let the other handling to continue.

PR:		bin/151023
Submitted by:	tjmao at tjmao.net
MFC after:	2 weeks

1 files changed, 8 insertions, 2 deletions

diff --git a/sbin/ping6/ping6.c b/sbin/ping6/ping6.c
index 01e29a1..b963de1 100644
--- a/sbin/ping6/ping6.c
+++ b/sbin/ping6/ping6.c
@@ -1090,8 +1090,14 @@ main(int argc, char *argv[])
 		/* signal handling */
 		if (seenalrm) {
 			/* last packet sent, timeout reached? */
-			if (npackets && ntransmitted >= npackets)
-				break;
+			if (npackets && ntransmitted >= npackets) {
+				struct timeval zerotime = {0, 0};
+				itimer.it_value = zerotime;
+				itimer.it_interval = zerotime;
+				(void)setitimer(ITIMER_REAL, &itimer, NULL);
+				seenalrm = 0;   /* clear flag */
+				continue;
+			}
 			retransmit();
 			seenalrm = 0;
 			continue;