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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>fattach</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_004_101"> </a>NAME</h4><blockquote>fattach - attach a STREAMS-based file descriptor to a filein the file system name space</blockquote><h4><a name = "tag_000_004_102"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stropts.h.html">stropts.h</a>>int fattach(int <i>fildes</i>, const char *<i>path</i>);</code></pre></blockquote><h4><a name = "tag_000_004_103"> </a>DESCRIPTION</h4><blockquote>The<i>fattach()</i>function attaches a STREAMS-based file descriptor to a file, effectivelyassociating a pathname with <i>fildes</i>. The <i>fildes</i> argument must be avalid open file descriptor associated with a STREAMS file. The <i>path</i>argument points to a pathname of an existing file. The process must haveappropriate privileges, or must be the owner of the file named by <i>path</i>and have write permission. A successful call to<i>fattach()</i>causes all pathnames that name the file named by<i>path</i>to name the STREAMS file associated with<i>fildes</i>,until the STREAMS file is detached from the file. A STREAMS file can beattached to more than one file and can have several pathnames associated withit.<p>The attributes of the named STREAMS file are initialised as follows: thepermissions, user ID, group ID, and times are set to those of the file namedby <i>path</i>, the number of links is set to 1, and the size and deviceidentifier are set to those of the STREAMS file associated with <i>fildes</i>.If any attributes of the named STREAMS file are subsequently changed (forexample, by<i><a href="chmod.html">chmod()</a></i>),neither the attributes of the underlying file nor the attributes of theSTREAMS file to which<i>fildes</i>refers are affected.<p>File descriptors referring to the underlying file, opened prior to an<i>fattach()</i>call, continue to refer to the underlying file.</blockquote><h4><a name = "tag_000_004_104"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>fattach()</i>returns 0. Otherwise, -1 is returned and<i>errno</i> is set to indicate the error.</blockquote><h4><a name = "tag_000_004_105"> </a>ERRORS</h4><blockquote>The<i>fattach()</i>function will fail if:<dl compact><dt>[EACCES]<dd>Search permission is denied for a component of the path prefix, orthe process is the owner of <i>path</i> but does not have writepermissions on the file named by <i>path</i>.<dt>[EBADF]<dd>The <i>fildes</i> argument is not a valid open file descriptor.<dt>[ENOENT]<dd>A component of <i>path</i> does not name an existing fileor <i>path</i> is an empty string.<dt>[ENOTDIR]<dd>A component of the path prefix is not a directory.<dt>[EPERM]<dd>The effective user ID of the process is not the owner of the file named by<i>path</i> and the process does not have appropriate privilege.<dt>[EBUSY]<dd>The file named by <i>path</i> is currently a mount point or has a STREAMS fileattached to it.<dt>[ENAMETOOLONG]<dd>The size of <i>path</i> exceeds {PATH_MAX}, ora component of <i>path</i> is longer than {NAME_MAX}.<dt>[ELOOP]<dd>Too many symbolic links were encountered in resolving <i>path</i>.</dl><br><p>The<i>fattach()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The <i>fildes</i> argument does not refer to a STREAMS file.<dt>[ENAMETOOLONG]<dd>Pathname resolution of a symbolic link produced an intermediate result whoselength exceeds {PATH_MAX}.<dt>[EXDEV]<dd>A link to a file on another file system was attempted.</dl></blockquote><h4><a name = "tag_000_004_106"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_107"> </a>APPLICATION USAGE</h4><blockquote>The<i>fattach()</i>function behaves similarly to the traditional<i>mount()</i>function in the way a file is temporarily replaced by the rootdirectory of the mounted file system. In the case of<i>fattach()</i>,the replaced file need not be a directory and the replacing file is a STREAMSfile.</blockquote><h4><a name = "tag_000_004_108"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_109"> </a>SEE ALSO</h4><blockquote><i><a href="fdetach.html">fdetach()</a></i>,<i><a href="isastream.html">isastream()</a></i>,<i><a href="stropts.h.html"><stropts.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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