154 lines
5.4 KiB
HTML
154 lines
5.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>ulimit</title>
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<basefont size="3"> <a name="ulimit"></a> <a name="tag_03_797"></a><!-- ulimit -->
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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_797_01"></a>NAME</h4>
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<blockquote>ulimit - get and set process limits</blockquote>
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<h4><a name="tag_03_797_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('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/ulimit.h.html">ulimit.h</a>><br>
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<br>
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long ulimit(int</tt> <i>cmd</i><tt>, ...); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_797_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>ulimit</i>() function shall control process limits. The process limits that can be controlled by this function include
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the maximum size of a single file that can be written (this is equivalent to using <a href=
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"../functions/setrlimit.html"><i>setrlimit</i>()</a> with RLIMIT_FSIZE). The <i>cmd</i> values, defined in <a href=
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"../basedefs/ulimit.h.html"><i><ulimit.h></i></a>, include:</p>
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<dl compact>
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<dt>UL_GETFSIZE</dt>
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<dd>Return the file size limit (RLIMIT_FSIZE) of the process. The limit shall be in units of 512-byte blocks and shall be inherited
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by child processes. Files of any size can be read. The return value shall be the integer part of the soft file size limit divided
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by 512. If the result cannot be represented as a <b>long</b>, the result is unspecified.</dd>
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<dt>UL_SETFSIZE</dt>
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<dd>Set the file size limit for output operations of the process to the value of the second argument, taken as a <b>long</b>,
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multiplied by 512. If the result would overflow an <b>rlim_t</b>, the actual value set is unspecified. Any process may decrease its
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own limit, but only a process with appropriate privileges may increase the limit. The return value shall be the integer part of the
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new file size limit divided by 512.</dd>
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</dl>
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<p>The <i>ulimit</i>() function shall not change the setting of <i>errno</i> if successful.</p>
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<p>As all return values are permissible in a successful situation, an application wishing to check for error situations should set
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<i>errno</i> to 0, then call <i>ulimit</i>(), and, if it returns -1, check to see if <i>errno</i> is non-zero.</p>
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</blockquote>
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<h4><a name="tag_03_797_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>ulimit</i>() shall return the value of the requested limit. Otherwise, -1 shall be returned and
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<i>errno</i> set to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_797_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>ulimit</i>() function shall fail and the limit shall be unchanged if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The <i>cmd</i> argument is not valid.</dd>
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<dt>[EPERM]</dt>
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<dd>A process not having appropriate privileges attempts to increase its file size limit.</dd>
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</dl>
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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_797_06"></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_03_797_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_797_08"></a>RATIONALE</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_797_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_797_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="getrlimit.html"><i>getrlimit</i>()</a> , <a href="setrlimit.html"><i>setrlimit</i>()</a> , <a href=
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"write.html"><i>write</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/ulimit.h.html"><i><ulimit.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_797_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_797_12"></a>Issue 5</h4>
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<blockquote>
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<p>In the description of UL_SETFSIZE, the text is corrected to refer to <b>rlim_t</b> rather than the spurious <b>rlimit_t</b>.</p>
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<p>The DESCRIPTION is updated to indicate that <i>errno</i> is not changed if the function is successful.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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