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Most diagnostic messages displayed by
some events that occured while processig a certain incoming request.
By default they contain only a short summary of the event.
Logging hooks are means of controlling actual amount of
information displayed in such messages. They allow you to add to the
message being displayed any relevant information from the incoming
request that caused the message to appear.
A hook is a special Rewrite function that takes three arguments and returns a string. There are two kinds of logging hooks: prefix and suffix. Return value from the prefix hook function will be displayed before the actual log message, that of the suffix hook function will be displayed after the message.
Furthermore, there may be global and channel-specific
hooks. Global hooks apply to all categories, unless overridden by
category-specific hooks. Global prefix hook is enabled by
prefix-hook statement appearing in the
Global suffix hook is enabled by
Both statements take as their argument the name of corresponding
For detailed information about writing logging hooks, See section Logging Hook Functions.
This document was generated by Sergey Poznyakoff on December, 6 2008 using texi2html 1.78.