From: Felix Windt <fwmailinglists@...>
Date: 2007-09-03T05:32:36+09:00
Subject: Re: Syslog facility

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> -----Original Message-----
> From: Craig Beck [mailto:craigbeck@luckybonza.com] 
> Sent: Sunday, September 02, 2007 1:03 PM
> To: ruby-talk ML
> Subject: Re: Syslog facility
> 
> 
> > -----
> > require 'syslog'
> > ...
> > $log = Syslog.open('progname', Syslog::LOG_PID, Syslog::LOG_LOCAL1)
> > ...
> > $log.info("messsage")
> > ------
> 
> Does anyone know if this works on OS X? Where would I look for the  
> output?
> 
> --
> Craig Beck
> 
> AIM: kreiggers
> 

OS X uses syslog, so it sure works on OS X.

Where things go is configured in /etc/syslog.conf

I don't believe I've edited this file on my wife's iBook, and line 2 there
shows:

*.notice;authpriv,remoteauth,ftp,install.none;kern.debug;mail.crit
/var/log/system.log

So anything with a level of larger than or equal to notice will go to
/var/log/system.log

Testing:

$ uname -a
Darwin fwindt.lan 8.10.0 Darwin Kernel Version 8.10.0: Wed May 23 16:50:59
PDT 2007; root:xnu-792.21.3~1/RELEASE_PPC Power Macintosh powerpc
$ irb
reqirb(main):001:0> require 'syslog'
=> true
irb(main):002:0> log = Syslog.open('progname', Syslog::LOG_PID,
Syslog::LOG_LOCAL1)
=> <#Syslog: opened=true, ident="progname", options=1, facility=136,
mask=255>
irb(main):003:0> log.err("my message")
=> <#Syslog: opened=true, ident="progname", options=1, facility=136,
mask=255>
irb(main):004:0> exit
$ grep "my message" /var/log/syslog
Sep  2 13:25:13 fwindt-2 progname[891]: my message


You can redirect to special log files like this:
Looking through syslog.conf, it appears as if OS X only uses local0 (it's
used for ipfw, the firewall). So you could use local1 as in the example, and
edit your syslog.conf to contain a line such as "local1.*
/var/log/myapp.log" to have your logs written to that file as well. Just to
mention it, there's no way of keeping other apps from using that facility as
well.
I believe you need to send a HUP to the syslog daemon for it to parse
changes to the config file.

HTH,

Felix

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