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(libc.info)Extending NSS

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Extending NSS
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   One of the advantages of NSS mentioned above is that it can be
extended quite easily.  There are two ways in which the extension can
happen: adding another database or adding another service.  The former
is normally done only by the C library developers.  It is here only
important to remember that adding another database is independent from
adding another service because a service need not support all databases
or lookup functions.

   A designer/implementor of a new service is therefore free to choose
the databases s/he is interested in and leave the rest for later (or
completely aside).

Adding another Service to NSS

What is to do to add a new service.

NSS Module Function Internals

Guidelines for writing new NSS

service functions.