252 lines
8.0 KiB
HTML
252 lines
8.0 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>mkfifo</title>
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<basefont size="3"> <a name="mkfifo"></a> <a name="tag_04_88"></a><!-- mkfifo -->
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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_04_88_01"></a>NAME</h4>
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<blockquote>mkfifo - make FIFO special files</blockquote>
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<h4><a name="tag_04_88_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>mkfifo</tt> <b>[</b><tt>-m</tt> <i>mode</i><b>]</b> <i>file</i><tt>...</tt></code></p>
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</blockquote>
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<h4><a name="tag_04_88_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>mkfifo</i> utility shall create the FIFO special files specified by the operands, in the order specified.</p>
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<p>For each <i>file</i> operand, the <i>mkfifo</i> utility shall perform actions equivalent to the <a href=
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"../functions/mkfifo.html"><i>mkfifo</i>()</a> function defined in the System Interfaces volume of IEEE Std 1003.1-2001,
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called with the following arguments:</p>
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<ol>
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<li>
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<p>The <i>file</i> operand is used as the <i>path</i> argument.</p>
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</li>
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<li>
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<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>
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argument. (If the <b>-m</b> option is specified, the value of the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a>
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<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>
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option-argument.)</p>
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</li>
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</ol>
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</blockquote>
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<h4><a name="tag_04_88_04"></a>OPTIONS</h4>
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<blockquote>
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<p>The <i>mkfifo</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
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<p>The following option shall be supported:</p>
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<dl compact>
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<dt><b>-m </b> <i>mode</i></dt>
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<dd>Set the file permission bits of the newly-created FIFO to the specified <i>mode</i> value. The <i>mode</i> option-argument
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shall be the same as the <i>mode</i> operand defined for the <a href="../utilities/chmod.html"><i>chmod</i></a> utility. In the
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<i>symbolic_mode</i> strings, the <i>op</i> characters <tt>'+'</tt> and <tt>'-'</tt> shall be interpreted relative to an assumed
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initial mode of <i>a</i>= <i>rw</i>.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_88_05"></a>OPERANDS</h4>
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<blockquote>
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<p>The following operand shall be supported:</p>
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<dl compact>
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<dt><i>file</i></dt>
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<dd>A pathname of the FIFO special file to be created.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_88_06"></a>STDIN</h4>
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<blockquote>
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<p>Not used.</p>
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</blockquote>
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<h4><a name="tag_04_88_07"></a>INPUT FILES</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_04_88_08"></a>ENVIRONMENT VARIABLES</h4>
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<blockquote>
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<p>The following environment variables shall affect the execution of <i>mkfifo</i>:</p>
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<dl compact>
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<dt><i>LANG</i></dt>
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<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
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the precedence of internationalization variables used to determine the values of locale categories.)</dd>
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<dt><i>LC_ALL</i></dt>
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<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
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<dt><i>LC_CTYPE</i></dt>
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<dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as
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opposed to multi-byte characters in arguments).</dd>
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<dt><i>LC_MESSAGES</i></dt>
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<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
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error.</dd>
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<dt><i>NLSPATH</i></dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_88_09"></a>ASYNCHRONOUS EVENTS</h4>
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<blockquote>
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<p>Default.</p>
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</blockquote>
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<h4><a name="tag_04_88_10"></a>STDOUT</h4>
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<blockquote>
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<p>Not used.</p>
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</blockquote>
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<h4><a name="tag_04_88_11"></a>STDERR</h4>
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<blockquote>
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<p>The standard error shall be used only for diagnostic messages.</p>
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</blockquote>
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<h4><a name="tag_04_88_12"></a>OUTPUT FILES</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_04_88_13"></a>EXTENDED DESCRIPTION</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_04_88_14"></a>EXIT STATUS</h4>
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<blockquote>
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<p>The following exit values shall be returned:</p>
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<dl compact>
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<dt> 0</dt>
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<dd>All the specified FIFO special files were created successfully.</dd>
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<dt>>0</dt>
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<dd>An error occurred.</dd>
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</dl>
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</blockquote>
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<h4><a name="tag_04_88_15"></a>CONSEQUENCES OF ERRORS</h4>
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<blockquote>
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<p>Default.</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_04_88_16"></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_04_88_17"></a>EXAMPLES</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_04_88_18"></a>RATIONALE</h4>
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<blockquote>
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<p>This utility was added to permit shell applications to create FIFO special files.</p>
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<p>The <b>-m</b> option was added to control the file mode, for consistency with the similar functionality provided by the <a href=
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"../utilities/mkdir.html"><i>mkdir</i></a> utility.</p>
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<p>Early proposals included a <b>-p</b> option similar to the <a href="../utilities/mkdir.html"><i>mkdir</i></a> <b>-p</b> option
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that created intermediate directories leading up to the FIFO specified by the final component. This was removed because it is not
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commonly needed and is not common practice with similar utilities.</p>
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<p>The functionality of <i>mkfifo</i> is described substantially through a reference to the <a href=
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"../functions/mkfifo.html"><i>mkfifo</i>()</a> function in the System Interfaces volume of IEEE Std 1003.1-2001. For
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example, by default, the mode of the FIFO file is affected by the file mode creation mask in accordance with the specified behavior
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of the <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a> function. In this way, there is less duplication of effort required
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for describing details of the file creation.</p>
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</blockquote>
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<h4><a name="tag_04_88_19"></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_04_88_20"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="chmod.html"><i>chmod</i>()</a> , <a href="umask.html"><i>umask</i>()</a> , the System Interfaces volume of
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IEEE Std 1003.1-2001, <a href="../functions/mkfifo.html"><i>mkfifo</i>()</a></p>
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</blockquote>
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<h4><a name="tag_04_88_21"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3.</p>
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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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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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