[systemd-devel] Journal log rotation notification

[giulix]

Mantas,

I do not want to reimplement all the logic myself, I just want to get 
journal entries directly at the source. The syscall you listed will do 
nicely, thank you, provided it supplies the right inode everytime my 
process is awakened by inotify. I will test it in the next hours/days.

Thanks again for this precious insight.

giulix

On 08/14/2015 01:56 PM, Mantas Mikulėnas wrote:
> On Fri, Aug 14, 2015 at 2:20 PM, giulix <giulio.martinat at gmail.com 
> <mailto:giulio.martinat at gmail.com>> wrote:
>
>     Hello,
>
>     I have a process that reads from the journald log file. It gets a
>     notification from inotify that something's changed, opens the
>     journal, skims through it for messages it's interested in, does
>     its stuff and closes the journal file
>     (http://www.giulix.it/content/extracting-data-systemd-journal-programmatically).
>     When the journal log file is rotated, the process stops to do its
>     job. It is, of course, because it never realizes the file it's
>     waiting on for notifications via inotify has changed.
>     I have uselessly tried to implement some mechanism to have my
>     process restarted when the journal file changes, but it seems that
>     nothing is available from systemd or journald to notify a process
>     that journald is switching to a new output file.
>
>
> There is no need for a signal – inotify can inform you about renames 
> as well.
>
> But, you shouldn't reimplement the entire logic yourself. (There's 
> more to it, like separate systemd or user journals....) *Instead, call 
> sd_journal_get_fd(3) and let libsystemd do the monitoring.*
>
> -- 
> Mantas Mikulėnas <grawity at gmail.com <mailto:grawity at gmail.com>>

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