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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) 2001-2003 The Open Group, All Rights Reserved --><title>mkfifo</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="mkfifo"></a> <a name="tag_04_88"></a><!-- mkfifo --> <!--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_04_88_01"></a>NAME</h4><blockquote>mkfifo - make FIFO special files</blockquote><h4><a name="tag_04_88_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>mkfifo</tt> <b>[</b><tt>-m</tt> <i>mode</i><b>]</b> <i>file</i><tt>...</tt></code></p></blockquote><h4><a name="tag_04_88_03"></a>DESCRIPTION</h4><blockquote><p>The <i>mkfifo</i> utility shall create the FIFO special files specified by the operands, in the order specified.</p><p>For each <i>file</i> operand, the <i>mkfifo</i> utility shall perform actions equivalent to the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a> function defined in the System Interfaces volume of IEEE Std 1003.1-2001,called with the following arguments:</p><ol><li><p>The <i>file</i> operand is used as the <i>path</i> argument.</p></li><li><p>The value of the bitwise-inclusive OR of S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH, and S_IWOTH is used as the <i>mode</i>argument. (If the <b>-m</b> option is specified, the value of the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a><i>mode</i> argument is unspecified, but the FIFO shall at no time have permissions less restrictive than the <b>-m</b> <i>mode</i>option-argument.)</p></li></ol></blockquote><h4><a name="tag_04_88_04"></a>OPTIONS</h4><blockquote><p>The <i>mkfifo</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p><p>The following option shall be supported:</p><dl compact><dt><b>-m </b> <i>mode</i></dt><dd>Set the file permission bits of the newly-created FIFO to the specified <i>mode</i> value. The <i>mode</i> option-argumentshall be the same as the <i>mode</i> operand defined for the <a href="../utilities/chmod.html"><i>chmod</i></a> utility. In the<i>symbolic_mode</i> strings, the <i>op</i> characters <tt>'+'</tt> and <tt>'-'</tt> shall be interpreted relative to an assumedinitial mode of <i>a</i>= <i>rw</i>.</dd></dl></blockquote><h4><a name="tag_04_88_05"></a>OPERANDS</h4><blockquote><p>The following operand shall be supported:</p><dl compact><dt><i>file</i></dt><dd>A pathname of the FIFO special file to be created.</dd></dl></blockquote><h4><a name="tag_04_88_06"></a>STDIN</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_88_07"></a>INPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>mkfifo</i>:</p><dl compact><dt><i>LANG</i></dt><dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> forthe precedence of internationalization variables used to determine the values of locale categories.)</dd><dt><i>LC_ALL</i></dt><dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd><dt><i>LC_CTYPE</i></dt><dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte asopposed to multi-byte characters in arguments).</dd><dt><i>LC_MESSAGES</i></dt><dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standarderror.</dd><dt><i>NLSPATH</i></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl></blockquote><h4><a name="tag_04_88_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_88_10"></a>STDOUT</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_88_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_88_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_14"></a>EXIT STATUS</h4><blockquote><p>The following exit values shall be returned:</p><dl compact><dt> 0</dt><dd>All the specified FIFO special files were created successfully.</dd><dt>>0</dt><dd>An error occurred.</dd></dl></blockquote><h4><a name="tag_04_88_15"></a>CONSEQUENCES OF ERRORS</h4><blockquote><p>Default.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_04_88_16"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_17"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_18"></a>RATIONALE</h4><blockquote><p>This utility was added to permit shell applications to create FIFO special files.</p><p>The <b>-m</b> option was added to control the file mode, for consistency with the similar functionality provided by the <a href="../utilities/mkdir.html"><i>mkdir</i></a> utility.</p><p>Early proposals included a <b>-p</b> option similar to the <a href="../utilities/mkdir.html"><i>mkdir</i></a> <b>-p</b> optionthat created intermediate directories leading up to the FIFO specified by the final component. This was removed because it is notcommonly needed and is not common practice with similar utilities.</p><p>The functionality of <i>mkfifo</i> is described substantially through a reference to the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a> function in the System Interfaces volume of IEEE Std 1003.1-2001. Forexample, by default, the mode of the FIFO file is affected by the file mode creation mask in accordance with the specified behaviorof the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a> function. In this way, there is less duplication of effort requiredfor describing details of the file creation.</p></blockquote><h4><a name="tag_04_88_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_88_20"></a>SEE ALSO</h4><blockquote><p><a href="chmod.html"><i>chmod</i>()</a> , <a href="umask.html"><i>umask</i>()</a> , the System Interfaces volume ofIEEE Std 1003.1-2001, <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a></p></blockquote><h4><a name="tag_04_88_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 3.</p></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
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