[systemd-devel] Is sd_journal_send non-blocking?

[Florian Weimer]

The manual page I've got does not say it is, but the implementation does 
not wait for acknowledgment from the journal.  The implementation does 
not block explicitly, but I think the sendmsg call can block until the 
receiver queue is empty.

The background for this question is that we have a feature request for a 
non-blocking logging interface.  I wonder if the journal fits this 
requirement.

I assume that with “non-blocking”, the feature request submitter means 
that the function does not block indefinitely, say due to a service 
process outage.  Memory allocations can take a fairly long time as well 
(due to paging), but I think that doesn't count here.

Thanks,
Florian