On Fri, Nov 17, 2000 at 03:47:50AM +0100, Markus Stumpf wrote:
> Working around the need for a kill -HUP to reread virtualdomains would
> (for performance reasons) imply to have a mechanism to notice changes
> to the cdb (timestamp on file e.g.) and only refresh when changed.
> This however could also be done with a "plain" virtualdomains file,
> except one would save the costs of hashing the file.
For each cdb lookup, the program mmaps the cdb, does a lookup, then
unmaps it. Provided that programs which change the file do so
atomically with rename(), the querying program will never have to
worry about missing data due to updates.
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