[systemd-devel] SyslogIdentifier does not work for messages printed with sd_journal_print

[Martin Belanger]

Hi Lennart,

I found a workaround. When looking at the source code for sd_journal_print(),
I saw that SYSLOG_IDENTIFIER defaults to the string pointed to by
program_invocation_short_name
(defined in errno.h). So I simply create a new string with the text that I
want to assign to SYSLOG_IDENTIFIER and I make program_invocation_short_name
point to it.

It may not be the prettiest fix, but it works for the daemons I'm
instantiating.

Thanks,
Martin


Martin Belanger
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On Tue, Jun 9, 2015 at 3:16 AM, Lennart Poettering <lennart at poettering.net>
wrote:

> On Tue, 02.06.15 20:31, Martin Belanger (martin.belanger at cyaninc.com)
> wrote:
>
> > I'm using systemd 219 (Ubuntu 15.04).
> >
> > I have three instances of a daemon running. I use SyslogIdentifier to
> > give each of them a unique identifier (e.g. myproc-1, myproc-2,
> > myproc-3).  I also redirect stdout/stderr to the journal using
> > StandardOutput=journal and StandardError=journal.
> >
> > I noticed that messages sent to the journal with printf (i.e. stdout)
> > get the proper SYSLOG_IDENTIFIER.  However, messages send to the
> > journal with sd_journal_print() get the default SYSLOG_IDENTIFIER
> > (i.e. the process name).  I also tried sd_journal_send() and get the
> > same result.
> >
> > Any thoughts as to why this is happening?
>
> SyslogIdentifier only really applies to stdout/stderr messages, not to
> native journal messages, which will not carry that id at all.
>
> The only reason the setting exists is because it's useful to set
> something there because stdout/stderr doesn't carry enough information
> for this, and because the same stdout/stderr stream can be shared
> among multiple processes it's difficult and misleading to
> automatically derive the identifier from them...
>
> Hence: I'd really prefer fi we didn't have that option at all, we
> justed added it, because it was difficult to do without...
>
> Lennart
>
> --
> Lennart Poettering, Red Hat
>
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