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Full Discussion: when a process fails to write to /dev/log
Top Forums UNIX for Advanced & Expert Users when a process fails to write to /dev/log Post 302436540 by malcolmpdx on Monday 12th of July 2010 09:52:11 AM
Old 07-12-2010
Assuming you mean "when does a process fail to write to /dev/log?"

/dev/log is a semi-standard convention for syslog - syslog listens on this UNIX socket, and writes what is written there according to the rules in it's configuration file.

Given that, you've got three reasons why a process might not be able to log:
  1. The process in question isn't set up to do syslog. Using syslog is optional, and needs to be part of the process code.
  2. syslogd isn't running, so there's nothing reading from that socket.
  3. There is a syslogd running, and the process is set up to log to syslog, but it fails before it reaches the part of it's code when it does.

To check for the first, if you have the source code for the process, check it for calls to openlog(), syslog(), and closelog(), or if it's a shell script, check for calls to the logger program. Perl scripts will usually use Sys::Syslog or something similar.

To check for the second, do:
Code:
 $ ps -efawww | egrep syslog

or even better

Code:
 # lsof /dev/log

and see what has /dev/log open

To check for the third, well, you might try running the process under a debugger, and see if you can catch any writes to /dev/log or calls to syslog. Or, you could run the process via "strace" (truss on some Unixes) and look for writes that way.
 

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LEARN ABOUT OPENSOLARIS

grablogs.conf

grablogs.conf(4)						   File Formats 						  grablogs.conf(4)

NAME

       grablogs.conf - grablogs configuration for libgrablogs.so of the plugins of
	gnome-system-log file

SYNOPSIS

       /usr/lib/gnome-system-log/plugins/grablogs.conf

DESCRIPTION

       The  libgrablogs.so  is	a plugin for gnome-system-log(1), it colloct the log files from the system as many as possible. grablogs.conf is a
       configuration file that contains a set of lines mixed with sh(1) syntax codes and individual
	log files. libgrablogs.so will read the file try to get a log files list for
	gnome-system-log(1). Users can copy the file into $HOME/.gnome2/gnome-system-log/plugins/`uname -p` to overwrite the system default one.

       The grablogs.conf file contains the following configuration categories:

	      [configs]
		     Each line under this category is interpreted as a config file of System. The plugin will open the config file and try to find
		     all system paths of the logs.

	      [commands]
		     Each line under this category is interpreted as a shell command and will be execute through a pipe. And each line of the out-
		     put of the command will be interpreted as a log path.

	      [logs] Each line under this category is interpreted as a log path.

FILES

       /usr/lib/gnome-system-log/plugins/grablogs.conf
	      The system default configuration file for the plugin libgrablogs.so

       $HOME/.gnome2/gnome-system-log/plugins/`uname -p`/grablogs.conf
	      The user specific configuration file for the plugin libgrablogs.so

EMAMPLE

       [configs]
       /etc/syslog.conf
       [commands]
       for i in `svcs -aH -o FMRI | grep -v lrc `; do svcprop -p restarter/logfile $i  2>/dev/null  ||	svcprop  -q  -p  restarter/alt_logfile	$i
       2>/dev/null ; done
       [logs]
       /var/log/messages
       /var/log/secure
       /var/log/maillog
       /var/log/cron
       /var/log/Xorg.0.log
       /var/log/XFree86.0.log
       /var/log/auth.log
       /var/log/cups/error_log

SEE ALSO

       gnome-system-log(1), pipelog.conf(1)

gnome-utils 2.16.0						    13 Oct 2006 						  grablogs.conf(4)
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