160 lines
4.9 KiB
HTML
160 lines
4.9 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 name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>creat</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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</script>
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<basefont size="3"> <a name="creat"></a> <a name="tag_03_93"></a><!-- creat -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_93_01"></a>NAME</h4>
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<blockquote>creat - create a new file or rewrite an existing one</blockquote>
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<h4><a name="tag_03_93_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('OH')">OH</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <sys/stat.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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#include <<a href="../basedefs/fcntl.h.html">fcntl.h</a>><br>
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<br>
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int creat(const char *</tt><i>path</i><tt>, mode_t</tt> <i>mode</i><tt>);<br>
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</tt></blockquote>
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<h4><a name="tag_03_93_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The function call:</p>
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<pre>
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<tt>creat(path, mode)
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</tt>
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</pre>
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<p>shall be equivalent to:</p>
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<pre>
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<tt>open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_93_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Refer to <a href="open.html"><i>open</i>()</a> .</p>
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</blockquote>
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<h4><a name="tag_03_93_05"></a>ERRORS</h4>
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<blockquote>
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<p>Refer to <a href="open.html"><i>open</i>()</a> .</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_93_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_93_06_01"></a>Creating a File</h5>
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<p>The following example creates the file <b>/tmp/file</b> with read and write permissions for the file owner and read permission
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for group and others. The resulting file descriptor is assigned to the <i>fd</i> variable.</p>
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<pre>
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<tt>#include <fcntl.h>
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...
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int fd;
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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char *filename = "/tmp/file";
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...
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fd = creat(filename, mode);
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...
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_93_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_93_08"></a>RATIONALE</h4>
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<blockquote>
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<p>The <i>creat</i>() function is redundant. Its services are also provided by the <a href=
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"../functions/open.html"><i>open</i>()</a> function. It has been included primarily for historical purposes since many existing
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applications depend on it. It is best considered a part of the C binding rather than a function that should be provided in other
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languages.</p>
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</blockquote>
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<h4><a name="tag_03_93_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_93_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="open.html"><i>open</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/fcntl.h.html"><i><fcntl.h></i></a>, <a href="../basedefs/sys/stat.h.html"><i><sys/stat.h></i></a>, <a
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href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_93_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_93_12"></a>Issue 6</h4>
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<blockquote>
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<p>In the SYNOPSIS, the optional include of the <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> header is
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removed.</p>
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<p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>The requirement to include <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> has been removed. Although <a
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href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> was required for conforming implementations of previous POSIX
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specifications, it was not required for UNIX applications.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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<hr>
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<center><font size="2"><!--footer start-->
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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