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| <h4 class="subsection">28.2.1 Services in the NSS configuration File</h4> |
| |
| <p>The above example file mentions four different services: <code>files</code>, |
| <code>db</code>, <code>nis</code>, and <code>nisplus</code>. This does not mean these |
| services are available on all sites and it does also not mean these are |
| all the services which will ever be available. |
| |
| <p>In fact, these names are simply strings which the NSS code uses to find |
| the implicitly addressed functions. The internal interface will be |
| described later. Visible to the user are the modules which implement an |
| individual service. |
| |
| <p>Assume the service <var>name</var> shall be used for a lookup. The code for |
| this service is implemented in a module called <samp><span class="file">libnss_</span><var>name</var></samp>. |
| On a system supporting shared libraries this is in fact a shared library |
| with the name (for example) <samp><span class="file">libnss_</span><var>name</var><span class="file">.so.2</span></samp>. The number |
| at the end is the currently used version of the interface which will not |
| change frequently. Normally the user should not have to be cognizant of |
| these files since they should be placed in a directory where they are |
| found automatically. Only the names of all available services are |
| important. |
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