cmd_ipc4: retry sendmsg on ENOBUFS/ENOMEM/ETOOMANYREFS

[public-inbox.git] / lib / PublicInbox / CmdIPC4.pm

diff --git a/lib/PublicInbox/CmdIPC4.pm b/lib/PublicInbox/CmdIPC4.pm
index 74dbf8a12ee4a8090a16d75a8ddbcaee6271cf3b..c3a7f56ec7e3f356243d270447402aa3217c499a 100644 (file)
--- a/lib/PublicInbox/CmdIPC4.pm
+++ b/lib/PublicInbox/CmdIPC4.pm
@@ -17,7 +17,16 @@ no warnings 'once';
        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);
+       my $s;
+       my $try = 0;
+       do {
+               $s = Socket::MsgHdr::sendmsg($sock, $mh, $flags);
+       } while (!defined($s) &&
+                       ($!{ENOBUFS} || $!{ENOMEM} || $!{ETOOMANYREFS}) &&
+                       (++$try < 50) &&
+                       warn "sleeping on sendmsg: $! (#$try)\n" &&
+                       select(undef, undef, undef, 0.1) == 0);
+       $s;
 };
 
 *recv_cmd4 = sub ($$$) {