[PATCH 5/4] DS: workaround IO::Kqueue EINTR (mis-)handling

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

IO::Kqueue seems unmaintained, so workaround a long-standing
bug where it falls over on signals:
https://rt.cpan.org/Ticket/Display.html?id=116615
---
 TODO                  |  4 ----
 lib/PublicInbox/DS.pm | 10 +++++++++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/TODO b/TODO
index ac255b8..d947b0f 100644
--- a/TODO
+++ b/TODO
@@ -52,10 +52,6 @@ all need to be considered for everything we introduce)
 
   cf.  https://public-inbox.org/git/20160814012706.GA18784@starla/
 
-* portability to FreeBSD (and other Free Software *BSDs)
-  ugh... https://rt.cpan.org/Ticket/Display.html?id=116615
-  (IO::KQueue is broken with Danga::Socket / PublicInbox::DS)
-
 * improve documentation
 
 * linkify thread skeletons better
diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 7bd5d42..ea09fc9 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -428,7 +428,15 @@ sub KQueueEventLoop {
 
     while (1) {
         my $timeout = RunTimers();
-        my @ret = $KQueue->kevent($timeout);
+        my @ret = eval { $KQueue->kevent($timeout) };
+        if (my $err = $@) {
+            # workaround https://rt.cpan.org/Ticket/Display.html?id=116615
+            if ($err =~ /Interrupted system call/) {
+                @ret = ();
+            } else {
+                die $err;
+            }
+        }
 
         foreach my $kev (@ret) {
             my ($fd, $filter, $flags, $fflags) = @$kev;
--