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| <h4 class="subsection">29.16.3 Testing for Netgroup Membership</h4> |
| |
| <p>It is often not necessary to scan the whole netgroup since often the |
| only interesting question is whether a given entry is part of the |
| selected netgroup. |
| |
| <!-- netdb.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: int <b>innetgr</b> (<var>const char *netgroup, const char *host, const char *user, const char *domain</var>)<var><a name="index-innetgr-3429"></a></var><br> |
| <blockquote><p>This function tests whether the triple specified by the parameters |
| <var>hostp</var>, <var>userp</var>, and <var>domainp</var> is part of the netgroup |
| <var>netgroup</var>. Using this function has the advantage that |
| |
| <ol type=1 start=1> |
| <li>no other netgroup function can use the global netgroup state since |
| internal locking is used and |
| <li>the function is implemented more efficiently than successive calls |
| to the other <code>set</code>/<code>get</code>/<code>endnetgrent</code> functions. |
| </ol> |
| |
| <p>Any of the pointers <var>hostp</var>, <var>userp</var>, and <var>domainp</var> can be |
| <code>NULL</code> which means any value is accepted in this position. This is |
| also true for the name <code>-</code> which should not match any other string |
| otherwise. |
| |
| <p>The return value is <code>1</code> if an entry matching the given triple is |
| found in the netgroup. The return value is <code>0</code> if the netgroup |
| itself is not found, the netgroup does not contain the triple or |
| internal errors occurred. |
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