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The GNU C Library

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28.4 Extending NSS

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).

28.4.1 Adding another Service to NSS  What is to do to add a new service.
28.4.2 Internals of the NSS Module Functions  Guidelines for writing new NSS service functions.

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