lei: give workers their own process group

This lets users Ctrl-Z from their terminal to pause an entire
git-clone process hierarchy.

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm
index f107c250..9620e264 100644
--- a/lib/PublicInbox/LEI.pm
+++ b/lib/PublicInbox/LEI.pm
@@ -460,9 +460,9 @@ my @WQ_KEYS = qw(lxs l2m ikw pmd wq1 lne); # internal workers
 sub _drop_wq {
         my ($self) = @_;
         for my $wq (grep(defined, delete(@$self{@WQ_KEYS}))) {
-                if ($wq->wq_kill) {
+                if ($wq->wq_kill('-TERM')) {
                         $wq->wq_close(0, undef, $self);
-                } elsif ($wq->wq_kill_old) {
+                } elsif ($wq->wq_kill_old('-TERM')) {
                         $wq->wq_wait_old(undef, $self);
                 }
                 $wq->DESTROY;
@@ -576,6 +576,7 @@ sub _lei_atfork_child {
         } else { # worker, Net::NNTP (Net::Cmd) uses STDERR directly
                 open STDERR, '+>&='.fileno($self->{2}) or warn "open $!";
                 STDERR->autoflush(1);
+                POSIX::setpgid(0, $$) // die "setpgid(0, $$): $!";
         }
         close($_) for (grep(defined, delete @$self{qw(3 old_1 au_done)}));
         if (my $op_c = delete $self->{pkt_op_c}) {
@@ -1148,9 +1149,10 @@ sub event_step {
                 if ($buf eq '') {
                         _drop_wq($self); # EOF, client disconnected
                         dclose($self);
-                } elsif ($buf =~ /\A(STOP|CONT)\z/) {
+                } elsif ($buf =~ /\A(?:STOP|CONT)\z/) {
+                        my $sig = "-$buf";
                         for my $wq (grep(defined, @$self{@WQ_KEYS})) {
-                                $wq->wq_kill($buf) or $wq->wq_kill_old($buf);
+                                $wq->wq_kill($sig) or $wq->wq_kill_old($sig);
                         }
                 } else {
                         die "unrecognized client signal: $buf";