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#!/usr/bin/env perl
use strict;
use warnings;
use 5.020;
use POSIX ":sys_wait_h";
$|++;
my $pid = open my $fh, '-|', (
'dbus-monitor',
'--system',
'type=signal,interface=org.freedesktop.login1.Session'
) or die "couldn't spawn dbus-monitor: $!";
$SIG{CHLD} = sub {
while ((my $child = waitpid -1, WNOHANG) > 0) {
if ($child == $pid) {
undef $pid;
}
}
exit unless $pid;
};
sub cleanup {
kill KILL => $pid if $pid;
undef $pid;
}
$SIG{TERM} = $SIG{INT} = sub { cleanup; exit; };
END { cleanup }
while (<$fh>) {
if (/\bmember=Lock\b/) {
system("on-lock") && say "on-lock failed";
say "LOCK";
}
}
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