Re: [BackupPC-users] Ping hangs and blocks if node is unreachable. w/ suggested fix.

[<cba...@us...>]

"Josh McAllister" writes:

> [snip]
> 
> What I discovered is that ping waits until it gets a reply and =
> everything else is blocked waiting for ping to finish.
> 
> Simple fix:
> 
> ping -w3 -c1 host
> 
> Causes to timeout and exit after 3 seconds. still returns non-zero if =
> ping failed.
> 
> Not sure how portable this is, but please investigate. Maybe some others 
> will comment?

FYI, starting in 2.0.0, configure.pl does this for a new install
(it keeps the current value for an upgrade):

    if ( $^O eq "solaris" || $^O eq "sunos" ) {
        $Conf{PingCmd} = '$pingPath -s $host 56 1';
    } elsif ( ($^O eq "linux" || $^O eq "openbsd" || $^O eq "netbsd")
            && !system("$Conf{PingClientPath} -c 1 -w 3 localhost") ) {
        $Conf{PingCmd} = '$pingPath -c 1 -w 3 $host';
    } else {
        $Conf{PingCmd} = '$pingPath -c 1 $host';
    }

So it should use ping -c 1 -w 3 $host if that works.  Otherwise it falls
back to ping -c 1 $host.  Oops, I see a typo: $Conf{PingClientPath}
should be $Conf{PingPath}, so that's why it incorrectly fell back to
ping -c 1 $host.  I'll fix that in 2.0.1 and CVS.

Craig