168 lines
5.2 KiB
HTML
168 lines
5.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>fstat64()--Get File Information by Descriptor (Large File
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Enabled)</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- Unix2 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Change History: -->
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<!-- 011022 JTROUS Changes from API Review 1, V5R2 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!--End Header Records --><!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>fstat64()--Get File Information by Descriptor (Large File Enabled)</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/stat.h>
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int fstat64(int <em>fildes</em>, struct stat64 <em>*buf</em>);
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</pre>
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Service Program Name: QP0LLIB1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Conditional; see <a href="#USAGE_NOTES">Usage Notes</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>fstat64()</strong> function gets status information about the
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file specified by the open file descriptor <em>file_descriptor</em> and stores
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the information in the area of memory indicated by the <em>buf</em> argument.
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The status information is returned in a <samp>stat64</samp> structure, as
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defined in the <strong><sys/stat.h></strong> header file.</p>
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<p><strong>fstat64()</strong> is enabled for large files. It is capable of
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operating on files larger than 2GB minus 1 byte as long as the file has been
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opened by either of the following:</p>
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<ul compact>
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<li>Using the <strong>open64()</strong> function (see <a href="open64.htm">
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open64()--Open File (Large File Enabled)</a>).</li>
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<li>Using the <strong>open()</strong> function (see <a href="open.htm">
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open()--Open File</a>) with O_LARGEFILE set in the oflag parameter.</li>
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</ul>
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<p>The elements of the <samp>stat64</samp> structure are described in <a href=
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"stat64.htm">stat64()--Get File Information (Large File Enabled)</a>.</p>
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<p>For additional information about parameters, authorities required, and error
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conditions, see <a href="fstat.htm">fstat()--Get File Information by
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Descriptor</a>.</p>
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<br>
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<h3><a name="usage_notes">Usage Notes</a></h3>
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<ol type="1">
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<li>When you develop in C-based languages, the prototypes for the 64-bit APIs
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are normally hidden. To use the <strong>fstat64()</strong> API and the <samp>
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struct stat64</samp> data type, you must compile the source with the
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_LARGE_FILE_API macro defined.<br>
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</li>
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<li>All of the usage notes for <strong>fstat()</strong> apply to <strong>
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fstat64()</strong>. See <a href="fstat.htm#HDRFSTAUSG">Usage Notes</a> in the
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<strong>fstat()</strong> API.</li>
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</ol>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example gets status information:</p>
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<pre>
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#define _LARGE_FILE_API
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <time.h>
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main() {
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char fn[]="temp.file";
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struct stat64 info;
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int file_descriptor;
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if ((file_descriptor = creat64(fn, S_IWUSR)) < 0)
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perror("creat64() error");
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else {
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if (ftruncate64(file_descriptor, 8589934662) != 0)
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perror("ftruncate64() error");
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else {
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if (fstat64(file_descriptor, &info) != 0)
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perror("fstat64() error");
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else {
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puts("fstat64() returned:");
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printf(" inode: %d\n", (int) info.st_ino);
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printf(" dev id: %d\n", (int) info.st_dev);
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printf(" mode: %08x\n", info.st_mode);
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printf(" links: %d\n", info.st_nlink);
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printf(" uid: %d\n", (int) info.st_uid);
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printf(" gid: %d\n", (int) info.st_gid);
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printf(" size: %lld\n", (long long) info.st_size);
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}
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}
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close(file_descriptor);
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unlink(fn);
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}
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}
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</pre>
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<p><strong>Output:</strong> Note that the output may vary from system to
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system.</p>
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<pre>
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fstat64() returned:
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inode: 3057
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dev id: 1
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mode: 03000080
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links: 1
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uid: 137
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gid: 500
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size: 8589934662
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</pre>
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<br>
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<hr>
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API introduced: V4R4
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</center>
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</html>
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