Using the System Log
Because network daemons are detached from standard error, warnings and diagnostics have nowhere to go unless the daemon explicitly writes the messages to a log file. However, there are issues involved with this, such as where to write the log file and how to synchronize log messages from the several children of a forked server. Fortunately, the UNIX operating system provides a robust and flexible logging system known as syslog that solves these problems.
Syslog is run by a daemon known as syslogd and configured via a system file called /etc/syslog.conf. Some systems have two logging daemons, one for kernel messages and one for all others.
The syslog system receives messages from two main sources: the operating system ...
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