📄 creat.html
字号:
<!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) 2001-2003 The Open Group, All Rights Reserved --><title>creat</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="creat"></a> <a name="tag_03_93"></a><!-- creat --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_93_01"></a>NAME</h4><blockquote>creat - create a new file or rewrite an existing one</blockquote><h4><a name="tag_03_93_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('OH')">OH</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <sys/stat.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br> #include <<a href="../basedefs/fcntl.h.html">fcntl.h</a>><br><br> int creat(const char *</tt><i>path</i><tt>, mode_t</tt> <i>mode</i><tt>);<br></tt></blockquote><h4><a name="tag_03_93_03"></a>DESCRIPTION</h4><blockquote><p>The function call:</p><pre><tt>creat(path, mode)</tt></pre><p>shall be equivalent to:</p><pre><tt>open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)</tt></pre></blockquote><h4><a name="tag_03_93_04"></a>RETURN VALUE</h4><blockquote><p>Refer to <a href="open.html"><i>open</i>()</a> .</p></blockquote><h4><a name="tag_03_93_05"></a>ERRORS</h4><blockquote><p>Refer to <a href="open.html"><i>open</i>()</a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_93_06"></a>EXAMPLES</h4><blockquote><h5><a name="tag_03_93_06_01"></a>Creating a File</h5><p>The following example creates the file <b>/tmp/file</b> with read and write permissions for the file owner and read permissionfor group and others. The resulting file descriptor is assigned to the <i>fd</i> variable.</p><pre><tt>#include <fcntl.h>...int fd;mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;char *filename = "/tmp/file";...fd = creat(filename, mode);...</tt></pre></blockquote><h4><a name="tag_03_93_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_93_08"></a>RATIONALE</h4><blockquote><p>The <i>creat</i>() function is redundant. Its services are also provided by the <a href="../functions/open.html"><i>open</i>()</a> function. It has been included primarily for historical purposes since many existingapplications depend on it. It is best considered a part of the C binding rather than a function that should be provided in otherlanguages.</p></blockquote><h4><a name="tag_03_93_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_93_10"></a>SEE ALSO</h4><blockquote><p><a href="open.html"><i>open</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/fcntl.h.html"><i><fcntl.h></i></a>, <a href="../basedefs/sys/stat.h.html"><i><sys/stat.h></i></a>, <ahref="../basedefs/sys/types.h.html"><i><sys/types.h></i></a></p></blockquote><h4><a name="tag_03_93_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_93_12"></a>Issue 6</h4><blockquote><p>In the SYNOPSIS, the optional include of the <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> header isremoved.</p><p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p><ul><li><p>The requirement to include <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> has been removed. Although <ahref="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> was required for conforming implementations of previous POSIXspecifications, it was not required for UNIX applications.</p></li></ul></blockquote><div class="box"><em>End of informative text.</em></div><hr><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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -