spamc: retry on EINTR

Signals can fire on us at any time if we're using blocking sysread.

diff --git a/lib/PublicInbox/Spamcheck/Spamc.pm b/lib/PublicInbox/Spamcheck/Spamc.pm
index 30eec95cc6fad519c02980fb7cbb16adec19ce88..ba8e44a489c031b8b237bec466fc2dfccb72943b 100644 (file)
--- a/lib/PublicInbox/Spamcheck/Spamc.pm
+++ b/lib/PublicInbox/Spamcheck/Spamc.pm
@@ -29,10 +29,14 @@ sub spamcheck {
                my $buf = '';
                $out = \$buf;
        }
+again:
        do {
                $r = sysread($fh, $$out, 65536, length($$out));
        } while (defined($r) && $r != 0);
-       defined $r or die "read failed: $!";
+       unless (defined $r) {
+               goto again if $!{EINTR};
+               die "read failed: $!";
+       }
        close $fh or die "close failed: $!";
        waitpid($pid, 0);
        ($? || $$out eq '') ? 0 : 1;