ipc: start supporting sending/receiving more than 3 FDs

Actually, sending 4 FDs will be useful for lei internal xsearch
work once we start accepting input from stdin.  It won't be used
with the lightweight lei(1) client, however.

For WWW (eventually), a single FD may be enough.

1 files changed, 7 insertions, 5 deletions

diff --git a/lib/PublicInbox/CmdIPC4.pm b/lib/PublicInbox/CmdIPC4.pm
index 90fca62d..c4fcb0d6 100644
--- a/lib/PublicInbox/CmdIPC4.pm
+++ b/lib/PublicInbox/CmdIPC4.pm
@@ -13,10 +13,12 @@ require Socket::MsgHdr; # XS
 no warnings 'once';
 
 # 3 FDs per-sendmsg(2) + buffer
-*send_cmd4 = sub ($$$$$$) { # (sock, in, out, err, buf, flags) = @_;
-        my $mh = Socket::MsgHdr->new(buf => $_[4]);
-        $mh->cmsghdr(SOL_SOCKET, SCM_RIGHTS, pack('iii', @_[1,2,3]));
-        Socket::MsgHdr::sendmsg($_[0], $mh, $_[5]) or die "sendmsg: $!";
+*send_cmd4 = sub ($$$$) { # (sock, fds, buf, flags) = @_;
+        my ($sock, $fds, undef, $flags) = @_;
+        my $mh = Socket::MsgHdr->new(buf => $_[2]);
+        $mh->cmsghdr(SOL_SOCKET, SCM_RIGHTS,
+                        pack('i' x scalar(@$fds), @$fds));
+        Socket::MsgHdr::sendmsg($sock, $mh, $flags) or die "sendmsg: $!";
 };
 
 *recv_cmd4 = sub ($$$) {
@@ -26,7 +28,7 @@ no warnings 'once';
         $_[1] = $mh->buf;
         return () if $r == 0;
         my (undef, undef, $data) = $mh->cmsghdr;
-        unpack('iii', $data);
+        unpack('i' x (length($data) / 4), $data);
 };
 
 } } # /eval /BEGIN