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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) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>fdetach</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="fdetach"></a> <a name="tag_03_144"></a><!-- fdetach --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_144_01"></a>NAME</h4><blockquote>fdetach - detach a name from a STREAMS-based file descriptor (<b>STREAMS</b>)</blockquote><h4><a name="tag_03_144_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSR')">XSR</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/stropts.h.html">stropts.h</a>><br><br> int fdetach(const char *</tt><i>path</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_144_03"></a>DESCRIPTION</h4><blockquote><p>The <i>fdetach</i>() function shall detach a STREAMS-based file from the file to which it was attached by a previous call to <ahref="../functions/fattach.html"><i>fattach</i>()</a>. The <i>path</i> argument points to the pathname of the attached STREAMSfile. The process shall have appropriate privileges or be the owner of the file. A successful call to <i>fdetach</i>() shall causeall pathnames that named the attached STREAMS file to again name the file to which the STREAMS file was attached. All subsequentoperations on <i>path</i> shall operate on the underlying file and not on the STREAMS file.</p><p>All open file descriptions established while the STREAMS file was attached to the file referenced by <i>path</i> shall stillrefer to the STREAMS file after the <i>fdetach</i>() has taken effect.</p><p>If there are no open file descriptors or other references to the STREAMS file, then a successful call to <i>fdetach</i>() shallbe equivalent to performing the last <a href="../functions/close.html"><i>close</i>()</a> on the attached file.</p></blockquote><h4><a name="tag_03_144_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>fdetach</i>() shall return 0; otherwise, it shall return -1 and set <i>errno</i> to indicate theerror.</p></blockquote><h4><a name="tag_03_144_05"></a>ERRORS</h4><blockquote><p>The <i>fdetach</i>() function shall fail if:</p><dl compact><dt>[EACCES]</dt><dd>Search permission is denied on a component of the path prefix.</dd><dt>[EINVAL]</dt><dd>The <i>path</i> argument names a file that is not currently attached.</dd><dt>[ELOOP]</dt><dd>A loop exists in symbolic links encountered during resolution of the <i>path</i> argument.</dd><dt>[ENAMETOOLONG]</dt><dd>The size of a pathname exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.</dd><dt>[ENOENT]</dt><dd>A component of <i>path</i> does not name an existing file or <i>path</i> is an empty string.</dd><dt>[ENOTDIR]</dt><dd>A component of the path prefix is not a directory.</dd><dt>[EPERM]</dt><dd>The effective user ID is not the owner of <i>path</i> and the process does not have appropriate privileges.</dd></dl><p>The <i>fdetach</i>() function may fail if:</p><dl compact><dt>[ELOOP]</dt><dd>More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the <i>path</i> argument.</dd><dt>[ENAMETOOLONG]</dt><dd>Pathname resolution of a symbolic link produced an intermediate result whose length exceeds {PATH_MAX}.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_144_06"></a>EXAMPLES</h4><blockquote><h5><a name="tag_03_144_06_01"></a>Detaching a File</h5><p>The following example detaches the STREAMS-based file <b>/tmp/named-STREAM</b> from the file to which it was attached by aprevious, successful call to <a href="../functions/fattach.html"><i>fattach</i>()</a>. Subsequent calls to open this file refer tothe underlying file, not to the STREAMS file.</p><pre><tt>#include <stropts.h>... char *filename = "/tmp/named-STREAM"; int ret;<br> ret = fdetach(filename);</tt></pre></blockquote><h4><a name="tag_03_144_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_144_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_144_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_144_10"></a>SEE ALSO</h4><blockquote><p><a href="fattach.html"><i>fattach</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/stropts.h.html"><i><stropts.h></i></a></p></blockquote><h4><a name="tag_03_144_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_144_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p></blockquote><h4><a name="tag_03_144_13"></a>Issue 6</h4><blockquote><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p><p>The wording of the mandatory [ELOOP] error condition is updated, and a second optional [ELOOP] error condition is added.</p></blockquote><div class="box"><em>End of informative text.</em></div><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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