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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>fstatvfs</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="fstatvfs"></a> <a name="tag_03_194"></a><!-- fstatvfs --> <!--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_194_01"></a>NAME</h4><blockquote>fstatvfs, statvfs - get file system information</blockquote><h4><a name="tag_03_194_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/sys/statvfs.h.html">sys/statvfs.h</a>><br><br> int fstatvfs(int</tt> <i>fildes</i><tt>, struct statvfs *</tt><i>buf</i><tt>);<br> int statvfs(const char *restrict</tt> <i>path</i><tt>, struct statvfs *restrict</tt> <i>buf</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_194_03"></a>DESCRIPTION</h4><blockquote><p>The <i>fstatvfs</i>() function shall obtain information about the file system containing the file referenced by<i>fildes</i>.</p><p>The <i>statvfs</i>() function shall obtain information about the file system containing the file named by <i>path</i>.</p><p>For both functions, the <i>buf</i> argument is a pointer to a <b>statvfs</b> structure that shall be filled. Read, write, orexecute permission of the named file is not required.</p><p>The following flags can be returned in the <i>f_flag</i> member:</p><dl compact><dt>ST_RDONLY</dt><dd>Read-only file system.</dd><dt>ST_NOSUID</dt><dd>Setuid/setgid bits ignored by <i><a href="../functions/exec.html">exec</a></i>.</dd></dl><p>It is unspecified whether all members of the <b>statvfs</b> structure have meaningful values on all file systems.</p></blockquote><h4><a name="tag_03_194_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>statvfs</i>() shall return 0. Otherwise, it shall return -1 and set <i>errno</i> to indicate theerror.</p></blockquote><h4><a name="tag_03_194_05"></a>ERRORS</h4><blockquote><p>The <i>fstatvfs</i>() and <i>statvfs</i>() functions shall fail if:</p><dl compact><dt>[EIO]</dt><dd>An I/O error occurred while reading the file system.</dd><dt>[EINTR]</dt><dd>A signal was caught during execution of the function.</dd><dt>[EOVERFLOW]</dt><dd>One of the values to be returned cannot be represented correctly in the structure pointed to by <i>buf</i>.</dd></dl><p>The <i>fstatvfs</i>() function shall fail if:</p><dl compact><dt>[EBADF]</dt><dd>The <i>fildes</i> argument is not an open file descriptor.</dd></dl><p>The <i>statvfs</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>[ELOOP]</dt><dd>A loop exists in symbolic links encountered during resolution of the <i>path</i> argument.</dd><dt>[ENAMETOOLONG]</dt><dd>The length 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 of <i>path</i> is not a directory.</dd></dl><br><p>The <i>statvfs</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_194_06"></a>EXAMPLES</h4><blockquote><h5><a name="tag_03_194_06_01"></a>Obtaining File System Information Using fstatvfs()</h5><p>The following example shows how to obtain file system information for the file system upon which the file named<b>/home/cnd/mod1</b> resides, using the <i>fstatvfs</i>() function. The <b>/home/cnd/mod1</b> file is opened with read/writeprivileges and the open file descriptor is passed to the <i>fstatvfs</i>() function.</p><pre><tt>#include <statvfs.h>#include <fcntl.h><br>struct statvfs buffer;int status;...fildes = open("/home/cnd/mod1", O_RDWR);status = fstatvfs(fildes, &buffer);</tt></pre><h5><a name="tag_03_194_06_02"></a>Obtaining File System Information Using statvfs()</h5><p>The following example shows how to obtain file system information for the file system upon which the file named<b>/home/cnd/mod1</b> resides, using the <i>statvfs</i>() function.</p><pre><tt>#include <statvfs.h><br>struct statvfs buffer;int status;...status = statvfs("/home/cnd/mod1", &buffer);</tt></pre></blockquote><h4><a name="tag_03_194_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_194_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_194_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_194_10"></a>SEE ALSO</h4><blockquote><p><a href="chmod.html"><i>chmod</i>()</a>, <a href="chown.html"><i>chown</i>()</a>, <a href="creat.html"><i>creat</i>()</a>, <ahref="dup.html"><i>dup</i>()</a>, <a href="exec.html"><i><a href="../functions/exec.html">exec</a></i>()</a>, <a href="fcntl.html"><i>fcntl</i>()</a>, <a href="link.html"><i>link</i>()</a>, <a href="mknod.html"><i>mknod</i>()</a>, <a href="open.html"><i>open</i>()</a>, <a href="pipe.html"><i>pipe</i>()</a>, <a href="read.html"><i>read</i>()</a>, <a href="time.html"><i>time</i>()</a>, <a href="unlink.html"><i>unlink</i>()</a>, <a href="utime.html"><i>utime</i>()</a>, <a href="write.html"><i>write</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/sys/statvfs.h.html"><i><sys/statvfs.h></i></a></p></blockquote><h4><a name="tag_03_194_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_194_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p><p>Large File Summit extensions are added.</p></blockquote><h4><a name="tag_03_194_13"></a>Issue 6</h4><blockquote><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p><p>The <b>restrict</b> keyword is added to the <i>statvfs</i>() prototype for alignment with the ISO/IEC 9899:1999standard.</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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