Problems with default contacts list

After some further testing, it looks like this behavior occurs any time multiple alerts are issued during the same run of munin-limits, not just when the default contacts list is used.

I think the contact commands are waiting for more input since they never receive an EOF. If I add the following code to close the pipe to the child process, then everything seems to work fine. (This is close to the end of generate_service_message in LimitsOld?.pm).

        DEBUG "[DEBUG] sending message: \"$txt\"";
        print $pipe $txt, "\n" if (defined $pipe);
        #### ADDED CODE BELOW ####
        if (defined $pipe) {
            close($pipe);
            $pipe = undef;
            munin_set_var_loc($contactobj, ["pipe"], undef);
        }
        #### ADDED CODE ABOVE ####
        $contactobj->{"num_messages"}
            = 1 + munin_get($contactobj, "num_messages", 0);   # $num_messages++

This is not the solution to the problem since it breaks other things (the combining of alerts into a single message), but it does help identify what the problem is.

I was reviewing the other tickets today and noticed that the issue reported here could be the same problem as reported in ticket #732 "munin-limits hangs when more than one contact is used" (version 1.2.6).

The fix is in r4073, and will be in the next 1.4 release.

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