186 lines
4.6 KiB
HTML
186 lines
4.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>getgid()--Get Real Group ID</title>
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</head>
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<body>
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</script>
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<a name="Top_Of_Page"></a>
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<h2>getgid()--Get Real Group ID</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax<br>
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<pre>
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#include <unistd.h>
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gid_t getgid(void);
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</pre>
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Service Program Name: QSYPAPI<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>getgid()</strong> function returns the real group ID (GID) of
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the calling thread. The real GID is the group ID under which the thread was
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created.</p>
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<p><strong>Note:</strong>: When a user profile swap is done with the QWTSETP
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API prior to running the getgid() function, the GID for the current profile is
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returned.</p>
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<br>
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<h3>Parameters</h3>
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<p>None.</p>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<dl compact>
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<dt><em>> 0</em></dt>
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<dd><strong>getgid()</strong> was successful. The value returned represents the
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<em>GID</em>.</dd>
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<dt><em>>= 0</em></dt>
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<dd><strong>getgid()</strong> was successful. If there is no <em>GID</em>, the
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user ID has no group profile associated with it and returns 0. Otherwise, if
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there is a group profile, the API returns the <em>GID</em> of the group
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profile.</dd>
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<dt><em>-1</em></dt>
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<dd><strong>getgid()</strong> was not successful. The <em>errno</em> global
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variable is set to indicate the error.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>getgid()</strong> is not successful, <em>errno</em> usually
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indicates one of the following errors. Under some conditions, <em>errno</em>
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could indicate an error other than those listed here.</p>
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<table cellpadding="5">
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<!-- cols="25 75" -->
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<tr>
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<th align="left" valign="bottom">Error condition</th>
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<th align="left" valign="bottom">Additional information</th>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EAGAIN">EAGAIN</a>]</em></td>
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<td align="left" valign="top">
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<p>Internal object compressed. Try again.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#EDAMAGE">EDAMAGE</a>]</em></td>
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<td align="left" valign="top">
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<p>The user profile associated with the thread <em>GID</em> or an internal
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system object is damaged.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top">
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<em>[<a href="unix14.htm#ENOMEM">ENOMEM</a>]</em></td>
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<td align="left" valign="top">
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<p>The user profile associated with the thread <em>GID</em> has exceeded its
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storage limit.</p>
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</td>
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</tr>
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</table>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>unistd.h</strong>> file (see <a href="unix13.htm">Header
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Files for UNIX-Type Functions</a>)</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example gets the real GID.</p>
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<pre>
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#include <unistd.h>
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main()
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{
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gid_t gid;
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if (-1 == (gid = getgid(void)))
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perror("getgid() error.");
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else
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printf("The real GID is: %u\n", gid);
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}
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</pre>
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<p><strong>Output:</strong></p>
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<pre>
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The real GID is: 75
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</pre>
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<hr>
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API introduced: V3R1 <br>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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