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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>mkfifo</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_1441"> </a>NAME</h4><blockquote>mkfifo - make FIFO special files</blockquote><h4><a name = "tag_001_014_1442"> </a>SYNOPSIS</h4><blockquote><pre><code>mkfifo <b>[</b>-m <i>mode</i><b>]</b><i> file</i>...</code></pre></blockquote><h4><a name = "tag_001_014_1443"> </a>DESCRIPTION</h4><blockquote>The<i>mkfifo</i>utility will create the FIFO special filesspecified by the operands, in the order specified.<p>For each<i>file</i>operand, the<i>mkfifo</i>utility will perform actions equivalent to the <b>XSH</b> specification<i><a href="../xsh/mkfifo.html">mkfifo()</a></i>function, called with the following arguments:<ol><p><li>The<i>file</i>operand is used as the<i>path</i>argument.<p><li>The value of the bitwise inclusiveOR ofS_IRUSR,S_IWUSR,S_IRGRP,S_IWGRP,S_IROTHandS_IWOTHis used as the<i>mode</i>argument.(If the<b>-m</b>option is specified, the<i>mode</i>option-argument overrides this default.)<p></ol></blockquote><h4><a name = "tag_001_014_1444"> </a>OPTIONS</h4><blockquote>The<i>mkfifo</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> .<p>The following option is supported:<dl compact><dt><b>-m </b><i>mode</i><dd>Set the file permission bits of the newly-created FIFO to the specified<i>mode</i>value.The<i>mode</i>option-argument will be the same as the<i>mode</i>operand defined for the<i><a href="chmod.html">chmod</a></i>utility.In the<i>symbolic_mode</i>strings, the<i>op</i>characters "+" and "-" will be interpreted relative toan assumed initial mode ofa=rw.</dl></blockquote><h4><a name = "tag_001_014_1445"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>file</i><dd>A pathname of the FIFO special file to be created.</dl></blockquote><h4><a name = "tag_001_014_1446"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_1447"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1448"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>mkfifo</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i></dl></blockquote><h4><a name = "tag_001_014_1449"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1450"> </a>STDOUT</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_1451"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_1452"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1453"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1454"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>All the specified FIFO special fileswere created successfully.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_1455"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1456"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1457"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1458"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1459"> </a>SEE ALSO</h4><blockquote><i><a href="umask.html">umask</a></i>,the <b>XSH</b> specification description of<i><a href="../xsh/mkfifo.html">mkfifo()</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> 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