t/sigfd: test EVFILT_SIGNAL vs signalfd differences

Verify that observed OpenBSD and FreeBSD EVFILT_SIGNAL behavior
works differently than what Linux signalfd does to ease upcoming
changes to PublicInbox::DS.

1 files changed, 22 insertions, 3 deletions

diff --git a/t/sigfd.t b/t/sigfd.t
index 0070ca73..15fc818a 100644
--- a/t/sigfd.t
+++ b/t/sigfd.t
@@ -7,6 +7,7 @@ use POSIX qw(:signal_h);
 use Errno qw(ENOSYS);
 require_ok 'PublicInbox::Sigfd';
 use PublicInbox::DS;
+my ($linux_sigfd, $has_sigfd);
 
 SKIP: {
         if ($^O ne 'linux' && !eval { require IO::KQueue }) {
@@ -16,16 +17,21 @@ SKIP: {
         my $old = PublicInbox::DS::block_signals();
         my $hit = {};
         my $sig = {};
+        local $SIG{USR2} = sub { $hit->{USR2}->{normal}++ };
         local $SIG{HUP} = sub { $hit->{HUP}->{normal}++ };
         local $SIG{TERM} = sub { $hit->{TERM}->{normal}++ };
         local $SIG{INT} = sub { $hit->{INT}->{normal}++ };
         local $SIG{WINCH} = sub { $hit->{WINCH}->{normal}++ };
-        for my $s (qw(HUP TERM INT WINCH)) {
+        for my $s (qw(USR2 HUP TERM INT WINCH)) {
                 $sig->{$s} = sub { $hit->{$s}->{sigfd}++ };
         }
+        kill 'USR2', $$ or die "kill $!";
+        ok(!defined($hit->{USR2}), 'no USR2 yet') or diag explain($hit);
         PublicInbox::DS->Reset;
         my $sigfd = PublicInbox::Sigfd->new($sig, 0);
         if ($sigfd) {
+                $linux_sigfd = 1 if $^O eq 'linux';
+                $has_sigfd = 1;
                 ok($sigfd, 'Sigfd->new works');
                 kill('HUP', $$) or die "kill $!";
                 kill('INT', $$) or die "kill $!";
@@ -39,8 +45,14 @@ SKIP: {
                 for my $s (qw(HUP INT)) {
                         is($hit->{$s}->{sigfd}, 1, "sigfd fired $s");
                         is($hit->{$s}->{normal}, undef,
-                                'normal $SIG{$s} not fired');
+                                "normal \$SIG{$s} not fired");
                 }
+                SKIP: {
+                        skip 'Linux sigfd-only behavior', 1 if !$linux_sigfd;
+                        is($hit->{USR2}->{sigfd}, 1,
+                                'USR2 sent before signalfd created received');
+                }
+                ok(!$hit->{USR2}->{normal}, 'USR2 not fired normally');
                 PublicInbox::DS->Reset;
                 $sigfd = undef;
 
@@ -63,7 +75,14 @@ SKIP: {
         } else {
                 skip('signalfd disabled?', 10);
         }
-        sigprocmask(SIG_SETMASK, $old) or die "sigprocmask $!";
+        ok(!$hit->{USR2}->{normal}, 'USR2 still not fired normally');
+        PublicInbox::DS::sig_setmask($old);
+        SKIP: {
+                ($has_sigfd && !$linux_sigfd) or
+                        skip 'EVFILT_SIGNAL-only behavior check', 1;
+                is($hit->{USR2}->{normal}, 1,
+                        "USR2 fired normally after unblocking on $^O");
+        }
 }
 
 done_testing;