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Full Discussion: Writing to System Logs
Operating Systems Linux Red Hat Writing to System Logs Post 302750861 by thmnetwork on Wednesday 2nd of January 2013 04:26:38 PM
Old 01-02-2013
syslog generally keeps its destination files open:

Code:
[root@localhost log]# fuser maillog
maillog:              4648
[root@localhost log]# ps -efa | grep 4648
root      4648     1  0  2012 ?        00:00:01 syslogd -m 0
root     11294  9649  0 16:20 pts/0    00:00:00 grep 4648
[root@localhost log]#

Obviously two programs can't/shouldn't be writing to the same file. There are also syslog-specific reasons for not wanting to do it this way: What if I'm doing a remote syslog? If you're logging directly to files you don't get to take advantage of that and if you want to build that funtionality in yourself then your job is just that much harder. What if the sysadmin wants your logs to go to two different files? etc, etc.

These are the problems the syslog daemon was created to resolve: make a single program broker access to the logging system, then you can solve common problems in one place and in a way that doesn't lead to programs clobbering the work of others.

Most languages have syslog bindings anyways so there's very little reason to want to do it a different way.
 

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SYSLOG(8)							  System Logging							 SYSLOG(8)

NAME
syslog-ng, syslogd DESCRIPTION
There are different syslog daemon implementations supported as the system's syslog service, currently syslogd, syslog-ng and rsyslogd The first installed daemon activates itself for the syslog service. Starting with openSUSE-11.2, it is rsyslogd, before it was syslog-ng. But this depends on the software selection during the installation. The name of the daemon used as syslog service is specified in the SYSLOG_DAEMON variable in /etc/sysconfig/syslog. The yast2 sysconfig module provides a comfortable way to switch to another installed daemon and restart the service. The /etc/init.d/syslog init script is able to handle all supported daemons. BUGS
Please report bugs at <http://www.suse.de/feedback> AUTHOR
Juergen Weigert <jw@novell.com> Marius Tomaschewski <mt@novell.com> SEE ALSO
sysklogd(8) syslogd(8) syslog.conf(5) syslog-ng(8) syslog-ng.conf(5) rsyslogd(8) rsyslog.conf(5) syslog May 2008 SYSLOG(8)
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