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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title><grp.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="<grp.h>"></a> <a name="tag_13_18"></a><!-- <grp.h> --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_13_18_01"></a>NAME</h4><blockquote>grp.h - group structure</blockquote><h4><a name="tag_13_18_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <grp.h></tt></p></blockquote><h4><a name="tag_13_18_03"></a>DESCRIPTION</h4><blockquote><p>The <i><grp.h></i> header shall declare the structure <b>group</b> which shall include the following members:</p><pre><tt>char *gr_name</tt> The name of the group. <tt>gid_t gr_gid </tt> Numerical group ID. <tt>char **gr_mem </tt> Pointer to a null-terminated array of character <tt> </tt> pointers to member names. <tt></tt></pre><p>The <b>gid_t</b> type shall be defined as described in <a href="sys/types.h.html"><i><sys/types.h></i></a> .</p><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>struct group *getgrgid(gid_t);struct group *getgrnam(const char *);<sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">int getgrgid_r(gid_t, struct group *, char *, size_t, struct group **);int getgrnam_r(const char *, struct group *, char *, size_t , struct group **);<img src="../images/opt-end.gif" alt="[Option End]" border="0"><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">struct group *getgrent(void);void endgrent(void);void setgrent(void);<img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></pre></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_18_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_18_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_18_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_18_07"></a>SEE ALSO</h4><blockquote><p><a href="sys/types.h.html"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <ahref="../functions/endgrent.html"><i>endgrent</i>()</a>, <a href="../functions/getgrgid.html"><i>getgrgid</i>()</a>, <a href="../functions/getgrnam.html"><i>getgrnam</i>()</a></p></blockquote><h4><a name="tag_13_18_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1.</p></blockquote><h4><a name="tag_13_18_09"></a>Issue 5</h4><blockquote><p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p></blockquote><h4><a name="tag_13_18_10"></a>Issue 6</h4><blockquote><p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p><ul><li><p>The definition of <b>gid_t</b> is mandated.</p></li><li><p>The <a href="../functions/getgrgid_r.html"><i>getgrgid_r</i>()</a> and <a href="../functions/getgrnam_r.html"><i>getgrnam_r</i>()</a> functions are marked as part of the Thread-Safe Functions option.</p></li></ul></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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