[PATCH 3/3] watch: reset HUP + USR1 signal handlers in children

[Eric Wong <e@80x24.org>]

Child processes handling IMAP/NNTP aren't going to want
to handle config reloads nor forced rescans, those are
exclusively for the parent.  We'll leave a note that
QUIT/TERM/INT can safely use the same callback for both
parent and children, as I nearly made the mistake of
resetting those to their default values in the child.
---
 lib/PublicInbox/Watch.pm  | 7 ++++---
 script/public-inbox-watch | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/Watch.pm b/lib/PublicInbox/Watch.pm
index a2dc125f..cf0720e3 100644
--- a/lib/PublicInbox/Watch.pm
+++ b/lib/PublicInbox/Watch.pm
@@ -250,7 +250,7 @@ sub quit_done ($) {
 	$live == 0;
 }
 
-sub quit {
+sub quit { # may be called in IMAP/NNTP children
 	my ($self) = @_;
 	$self->{quit} = 1;
 	%{$self->{opendirs}} = ();
@@ -260,7 +260,7 @@ sub quit {
 		my $di = $PublicInbox::DS::DescriptorMap{$fd};
 		$di->close if $di && $di->can('add_watches');
 	}
-	if (my $idle_mic = delete $self->{idle_mic}) {
+	if (my $idle_mic = delete $self->{idle_mic}) { # IMAP child
 		return unless $idle_mic->IsConnected && $idle_mic->Socket;
 		eval { $idle_mic->done };
 		if ($@ && $idle_mic->IsConnected && $idle_mic->Socket) {
@@ -387,7 +387,8 @@ sub watch_atfork_child ($) {
 	delete $self->{opendirs};
 	PublicInbox::DS->Reset;
 	my $sig = delete $self->{sig};
-	$sig->{CHLD} = 'DEFAULT';
+	$sig->{CHLD} = $sig->{HUP} = $sig->{USR1} = 'DEFAULT';
+	# TERM/QUIT/INT call ->quit, which works in both parent+child
 	@SIG{keys %$sig} = values %$sig;
 	PublicInbox::DS::sig_setmask(PublicInbox::DS::allowset($sig));
 }
diff --git a/script/public-inbox-watch b/script/public-inbox-watch
index 870cd31b..d9215de9 100755
--- a/script/public-inbox-watch
+++ b/script/public-inbox-watch
@@ -41,7 +41,7 @@ if ($watch) {
 		warn "# scanning\n";
 		$watch->trigger_scan('full');
 	};
-	my $quit = sub {
+	my $quit = sub { # may be called in IMAP/NNTP children
 		$watch->quit if $watch;
 		$watch = undef;
 		$0 .= ' quitting';