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<title>getgrgid_r()--Get Group Information Using Group ID</title>
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<h2>getgrgid_r()--Get Group Information Using Group ID</h2>
<div class="box" style="width: 70%;">
<br>
&nbsp;&nbsp;Syntax<br>
<pre>
#include &lt;sys/types.h&gt;
#include &lt;grp.h&gt;
int getgrgid_r(gid_t <em>gid</em>, struct group <em>*grp</em>,
char <em>*buffer</em>, size_t <em>bufsize</em>, struct group
<em>**result</em>);
</pre>
&nbsp;&nbsp;Service Program Name: QSYPAPI<br>
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<br>
&nbsp;&nbsp;Default Public Authority: *USE<br>
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<br>
&nbsp;&nbsp;Threadsafe: Yes<br>
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<br>
</div>
<p>The <strong>getgrgid_r()</strong> function updates the group structure
pointed to by <em>grp</em> and stores a pointer to that structure in the
location pointed to by <em>result</em>. The structure contains an entry from
the user database with a matching <em>GID</em>.</p>
<br>
<h3>Parameters</h3>
<dl>
<dt><strong><em>gid</em></strong></dt>
<dd>(Input) Group ID.<br>
</dd>
<dt><strong><em>grp</em></strong></dt>
<dd>(Input) A pointer to a group structure.<br>
</dd>
<dt><strong><em>buffer</em></strong></dt>
<dd>(Input) A pointer to a buffer from which memory is allocated to hold
storage areas referenced by the group structure <em>grp</em>.<br>
</dd>
<dt><strong><em>bufsize</em></strong></dt>
<dd>(Input) The size of <em>buffer</em> in bytes.<br>
</dd>
<dt><strong><em>result</em></strong></dt>
<dd>(Input) A pointer to a location in which a pointer to the updated group
structure is stored. If an error occurs or if the requested entry cannot be
found, a NULL pointer is stored in this location.</dd>
</dl>
<p>The <samp>struct group</samp>, which is defined in the <strong>
grp.h</strong> header file, has the following elements:<br>
</p>
<table border cellpadding="5">
<tr>
<td align="left" valign="top" width="10%">char *</td>
<td align="left" valign="top" width="10%">gr_name</td>
<td align="left" valign="top" width="80%">Name of the group</td>
</tr>
<tr>
<td align="left" valign="top" width="10%">gid_t</td>
<td align="left" valign="top" width="10%">gr_gid</td>
<td align="left" valign="top" width="80%">Group ID</td>
</tr>
<tr>
<td align="left" valign="top" width="10%">char **</td>
<td align="left" valign="top" width="10%">gr_mem</td>
<td align="left" valign="top" width="80%">A null-terminated list of pointers to
the individual member profile names. If the group profile does not have any
members or if the caller does not have *READ authority to the group profile,
the list will be empty.</td>
</tr>
</table>
<br>
<h3>Authorities</h3>
<p>*READ authority is required to the user profile associated with the <em>
gid</em>. If the user does not have *READ authority, only the name of the group
and the group ID values are returned.</p>
<br>
<h3>Return Value</h3>
<dl compact>
<dt><em>0</em></dt>
<dd><strong>getgrgid_r</strong> was successful.</dd>
<dt><em>Any other value</em></dt>
<dd>Failure: The return value contains an error number indicating the
error.</dd>
</dl>
<br>
<h3>Error Conditions</h3>
<p>If <strong>getgrgid_r()</strong> is not successful, the return value usually
indicates one of the following errors. Under some conditions, the value could
indicate an error other than those listed here.</p>
<table cellpadding="5">
<!-- cols="25 75" -->
<tr>
<th align="left" valign="bottom">Error condition</th>
<th align="left" valign="bottom">Additional information</th>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#EAGAIN">EAGAIN</a>]</em></td>
<td align="left" valign="top">
<p>The user profile associated with the <em>GID</em> is currently locked by
another process.</p>
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#EC2">EC2</a>]</em></td>
<td align="left" valign="top">
<p>Detected pointer that is not valid.</p>
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#EINVAL">EINVAL</a>]</em></td>
<td align="left" valign="top">
<p>Value is not valid. Check the job log for messages.</p>
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#ENOENT">ENOENT</a>]</em></td>
<td align="left" valign="top">
The user profile associated with the <em>GID</em> was not found.
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#ENOMEM">ENOMEM</a>]</em></td>
<td align="left" valign="top">
<p>The user profile associated with the <em>GID</em> has exceeded its storage
limit.</p>
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#ENOSPC">ENOSPC</a>]</em></td>
<td align="left" valign="top">
<p>Machine storage limit exceeded.</p>
</td>
</tr>
<tr>
<td align="left" valign="top">
<em>[<a href="unix14.htm#ERANGE">ERANGE</a>]</em></td>
<td align="left" valign="top">
<p>Insufficient storage was supplied by <em>buffer</em> and <em>bufsize</em>
to contain the data to be referenced by the resulting group structure.</p>
</td>
</tr>
</table>
<br>
<h3>Related Information</h3>
<ul>
<li>The &lt;<strong>grp.h</strong>&gt; file <a href="unix13.htm">Header Files
for UNIX-Type Functions</a>(see )<br>
</li>
<li><a href="getgrgid.htm">getgrgid()</a>--Get Group Information Using Group
ID</li>
</ul>
<br>
<h3>Example</h3>
<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
for information pertaining to code examples.</p>
<p>The following example gets the group information for the gid of 91. The
group name is GROUP1. There are two group members, CLIFF and PATRICK.</p>
<pre>
#include &lt;sys/types.h&gt;
#include &lt;grp.h&gt;
#include &lt;stdio.h&gt;
#include &lt;errno.h&gt;
main()
{ short int lp;
struct group grp;
struct group * grpptr=&amp;grp;
struct group * tempGrpPtr;
char grpbuffer[200];
int grplinelen = sizeof(grpbuffer);
if ((getgrgid_r(91,grpptr,grpbuffer,grplinelen,&amp;tempGrpPtr))!=0)
perror("getgrgid_r() error.");
else
{
printf("\nThe group name is: %s\n", grp.gr_name);
printf("The gid is: %u\n", grp.gr_gid);
for (lp = 1; NULL != *(grp.gr_mem); lp++, (grp.gr_mem)++)
printf("Group Member %d is: %s\n", lp, *(grp.gr_mem));
}
}
</pre>
<p><strong>Output:</strong></p>
<pre>
The group name is: GROUP1
The gid is: 91
Group member 1 is: CLIFF
Group member 2 is: PATRICK
</pre>
<hr>
API introduced: V4R4 <br>
<hr>
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