Re: bin/53463: ping responds late to SIGINT

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR bin/53463; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: bin/53463: ping responds late to SIGINT
Date: Mon, 23 Jul 2018 15:01:40 -0000 (UTC)

 kre%munnari.OZ.AU@localhost (Robert Elz) writes:
 
 >   | On NetBSD 8.0 this instantly brings back the shell prompt.
 > 
 > Are you sure?   That's not how I remember it, more or less, forever.
 
 On NetBSD _7_ it does, but NetBSD 8.0 shows the same behaviour as -current.
 
 This is the result of the fix for PR 51267 in ping.c 1.111.
 
 > The SIGINT tells ping to stop sending, it then waits for replies to the last
 > packets it sent (anything outstanding) calculates the stats on what was
 > sent/received ... etc, prints the results, and exits.
 
 It exits immediately if no packet had been sent yet or if a second SIGINT
 is sent.
 
 ktrace shows that the delay isn't for the ping interval, but for a DNS
 query. This query is executed with blocked signals and may take some time,
 depending on wether the answer is cached or not.
 
 ping -n doesn't show the problem.
 
 
 Greetings,
 -- 
 -- 
                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."