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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>fchmod</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_119"> </a>NAME</h4><blockquote>fchmod - change mode of a file</blockquote><h4><a name = "tag_000_004_120"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="sysstat.h.html">sys/stat.h</a>>int fchmod(int <i>fildes</i>, mode_t <i>mode</i>);</code></pre></blockquote><h4><a name = "tag_000_004_121"> </a>DESCRIPTION</h4><blockquote>The<i>fchmod()</i>function has the same effect as<i><a href="chmod.html">chmod()</a></i>except that the file whose permissions are to be changed is specified by thefile descriptor<i>fildes</i>.<p>If the Shared Memory Objects option is supported, and<i>fildes</i>references a shared memory object, the<i>fchmod()</i>function need only affect the S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP,S_IROTH, and S_IWOTH file permission bits.</blockquote><h4><a name = "tag_000_004_122"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>fchmod()</i>returns 0. Otherwise, it returns -1 and sets<i>errno</i> to indicate the error.</blockquote><h4><a name = "tag_000_004_123"> </a>ERRORS</h4><blockquote>The<i>fchmod()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The <i>fildes</i> argument is not an open file descriptor.<dt>[EPERM]<dd>The effective user ID does not match the owner of the file and theprocess does not have appropriate privilege.<dt>[EROFS]<dd>The file referred to by <i>fildes</i> resides on a read-only file system.</dl><p>The<i>fchmod()</i>function may fail if:<dl compact><dt>[EINTR]<dd>The<i>fchmod()</i>function was interrupted by a signal.<dt>[EINVAL]<dd>The value of the <i>mode</i> argument is invalid.<dt>[EINVAL]<dd>The<i>fildes</i>argument refers to a pipe and the implementation disallows execution of<i>fchmod()</i>on a pipe.</dl></blockquote><h4><a name = "tag_000_004_124"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_125"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_126"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_004_127"> </a>SEE ALSO</h4><blockquote><pre><i><a href="chmod.html">chmod()</a></i>,<i><a href="chown.html">chown()</a></i>,<i><a href="creat.html">creat()</a></i>,<i><a href="fcntl.html">fcntl()</a></i>,<i><a href="fstatvfs.html">fstatvfs()</a></i>,<i><a href="mknod.html">mknod()</a></i>,<i><a href="open.html">open()</a></i>,<i><a href="read.html">read()</a></i>,<i><a href="stat.html">stat()</a></i>,<i><a href="write.html">write()</a></i>,<i><a href="sysstat.h.html"><sys/stat.h></a></i>.</pre></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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