Re: Question on syslogd and syslog

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the mechanism for putting all the logs with a paticular facility in a different logfile if the filtering that I mentioned. if you use anything other than sysklogd, you can filter things into files based on anything in the message, not just the facility.
David Lang

On Sun, 3 Jul 2011, Sri Ram Vemulpali wrote:

Facilities of syslogd are associated to a particular file. So, in my
application there are 20 tasks which needs to have a separate log file
for every task. So, mapping every task to one facility fills my
requirement. So, this is the reason I want to extend the facilities of
level LOGLOCAL0-7.

Coming to previous question, the purpose is to fulfill the above requirement.


On Sat, Jul 2, 2011 at 1:23 PM,  <david@xxxxxxx> wrote:
the problem is that in the syslog spec, the facility and severity get
combined into one 8 bit field (one of the two only has 12 values defined
instead of 16, but I don't remember off the top of my head which one)

so extending this is creating a new protocol.

also, the reason I was talking about filtering is that other than filtering,
what purpose is there in settng the facility?

David Lang

On Sat, 2 Jul 2011, Sri Ram Vemulpali wrote:

Thanks for the replies. My question is more on how to extend
facilities, rather on how to filter the messages. It seems there is a
code in the toolchain syslog.h where the array representing the
facilities needs to be extended. Please correct me if I am wrong.


On Tue, Jun 28, 2011 at 3:41 PM,  <david@xxxxxxx> wrote:

you would be creating a completely different over-the-wire protocol for
syslog messages.

however, note that newer syslog daemons (syslog-ng and rsyslog for
allow you to do filtering on just about anything in the message, not just
the facility and severity.

David Lang

On Tue, 28 Jun 2011, Sri Ram Vemulpali wrote:

Date: Tue, 28 Jun 2011 14:11:59 -0400
From: Sri Ram Vemulpali <sri.ram.gmu06@xxxxxxxxx>
To: linux-kernel-mail <linux-kernel@xxxxxxxxxxxxxxx>,
Subject: Question on syslogd and syslog

Hello All,

  I am looking to modify number of facilities available in syslog so
that for my application I can have much more array of them at disposal
of my need. So currently only LOG_LOCAL0 - LOG_LOCAL7 are defined for
user, what if I want to extend them, is there a way I can extend them.
Or should I go ahead and modify the source code of syslog. Can any
please point me in right direction and where can I get syslogd and
syslog source code. Thanks in advance.

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