sd_journal_get_data() returns 0 (zero) in that case.
22.06.2016, 14:51, "Luca BRUNO" <lu...@debian.org>:
> On Wednesday 22 June 2016 12:10:14 Dennis Semakin wrote:
>
>> The task is to obtain messages _only_ with specified fields (e.g.
>> MESSAGE_ID=bla-bla-bla).
>
>> And problem is that I can see incoming messages even when sending tool is
>> not running (no execution). Looks like I got all messages from journal
>> (kernel, other services, etc.).
>
>> for (;;) {
>>
>> const void *data;
>> size_t length;
>>
>> ret = sd_journal_next(sdj);
>> if (ret == 0) {
>> ret = sd_journal_wait(sdj, (uint64_t) -1);
>> printf("wait ret = %d \n", ret);
>> }
>>
>> sd_journal_get_data(sdj, "MESSAGE", &data, &length);
>> printf(">%.*s<\n", (int) length, data);
>
> I think I've seen something similar, so I'll note it here even if I'm not sure
> if my understanding is correct:
>
> sd_journal_wait() will trigger on *any* events, while sd_journal_get_data()
> will apply the filter and find no matching entries.
> I'm not sure why you see a consistent printing behavior, though. Can you check
> the return value of sd_journal_get_data() in that case?
>
> NB: I'm not much familiar with that codebase and haven't digged into the
> source enough to confirm my speculation, so take it cum grano salis.
>
> Cheers, Luca
>
> --
> «Доверяй, но проверяй»
> ,
>
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