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ibm-information-center/dist/eclipse/plugins/i5OS.ic.apis_5.4.0.1/getpwuid.htm

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<title>getpwuid()--Get User Information for User ID</title>
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<h2>getpwuid()--Get User Information for User ID</h2>
<div class="box" style="width: 70%;">
<br>
&nbsp;&nbsp;Syntax<br>
<pre>
#include &lt;pwd.h&gt;
struct passwd *getpwuid(uid_t <em>uid</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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&nbsp;&nbsp;Threadsafe: No<br>
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</div>
<p>The <strong>getpwuid()</strong> function returns a pointer to an object of
type <samp>struct passwd</samp> containing an entry from the user database with
a matching <em>UID</em>.</p>
<br>
<h3>Parameters</h3>
<dl>
<dt><strong><em>uid</em></strong></dt>
<dd>(Input) User ID.</dd>
</dl>
<br>
<h3>Authorities</h3>
<p>*READ authority is required to the user profile associated with the <em>
UID</em>. If the user does not have *READ authority, only the user name, user
ID, and group ID values are returned.</p>
<p><strong>Note:</strong> Adopted authority is not used.</p>
<br>
<h3>Return Value</h3>
<dl compact>
<dt><em>struct passwd *</em></dt>
<dd><strong>getpwuid()</strong> was successful. The return value points to
static data of the format <samp>struct passwd</samp>, which is defined in the
<strong>pwd.h</strong> header file. This storage is overwritten on each call to
this function. This static storage area is also used by the <strong>
getpwnam()</strong> function. The <samp>struct passwd</samp> has the following
elements:<br>
<table border>
<tr>
<td align="left" valign="top" width="10%">char *</td>
<td align="left" valign="top" width="15%">pw_name</td>
<td align="left" valign="top" width="75%">User name</td>
</tr>
<tr>
<td align="left" valign="top">uid_t</td>
<td align="left" valign="top">pw_uid</td>
<td align="left" valign="top">User ID</td>
</tr>
<tr>
<td align="left" valign="top">uid_t</td>
<td align="left" valign="top">pw_gid</td>
<td align="left" valign="top">Group ID of the user's first group. If the user
does not have a first group, the gid value will be set to 0.</td>
</tr>
<tr>
<td align="left" valign="top">char *</td>
<td align="left" valign="top">pw_dir</td>
<td align="left" valign="top">Initial working directory. If the user does not
have *READ authority to the user profile, the pw_dir pointer will be set to
NULL.</td>
</tr>
<tr>
<td align="left" valign="top">char *</td>
<td align="left" valign="top">pw_shell</td>
<td align="left" valign="top">Initial user program. If the user does not have
*READ authority to the user profile, the pw_shell pointer will be set to
NULL.</td>
</tr>
</table>
<br>
</dd>
<dt><em>NULL pointer</em></dt>
<dd><strong>getpwuid()</strong> was not successful. The <em>errno</em> global
variable is set to indicate the error.</dd>
</dl>
<p>See <a href="getpwuidu.htm">QlgGetpwuid()--Get User Information for User ID
(using NLS-enabled path name)</a> for a description and an example where the
path name is returned in any CCSID.</p>
<br>
<h3>Error Conditions</h3>
<p>If <strong>getpwuid()</strong> is not successful, <em>errno</em> usually
indicates one of the following errors. Under some conditions, <em>errno</em>
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>UID</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">
<p>The user profile associated with <em>UID</em> was not found.</p>
</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>UID</em> has exceeded its storage
limit or is unable to allocate memory.</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#EUNKNOWN">EUNKNOWN</a>]</em></td>
<td align="left" valign="top">
<p>Unknown system state. Check the job log for a CPF9872 message. If there is
no message, verify that the home directory field in the user profile can be
displayed.</p>
</td>
</tr>
</table>
<br>
<h3>Usage Notes</h3>
<p>The initial working directory is returned in the CCSID value of the job.</p>
<br>
<h3>Related Information</h3>
<ul>
<li>The &lt;<strong>pwd.h</strong>&gt; file (see <a href="unix13.htm">Header
Files for UNIX-Type Functions</a>)<br>
</li>
<li><a href="gtpwuidr.htm">getpwuid_r()</a>--Get User Information for User
ID<br>
</li>
<li><a href="getpwuidu.htm">QlgGetpwuid()</a>--Get User Information for User ID
(using NLS-enabled path name)</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 user database information for the UID of 22.
The user name is MYUSER. The gid of MYUSER's first group is 1012. The initial
directory is /home/MYUSER. The initial user program is *LIBL/QCMD.</p>
<br>
<pre>
#include &lt;pwd.h&gt;
main()
{
struct passwd *pd;
if (NULL == (pd = getpwuid(22)))
perror("getpwuid() error.");
else
{
printf("The user name is: %s\n", pd-&gt;pw_name);
printf("The user id is: %u\n", pd-&gt;pw_uid);
printf("The group id is: %u\n", pd-&gt;pw_gid);
printf("The initial directory is: %s\n", pd-&gt;pw_dir);
printf("The initial user program is: %s\n", pd-&gt;pw_shell);
}
}
</pre>
<p><strong>Output:</strong></p>
<pre>
The user name is: MYUSER
The user id is: 22
The group id is: 1012
The initial directory is: /home/MYUSER
The initial user program is: *LIBL/QCMD
</pre>
<hr>
API introduced: V3R1
<hr>
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