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<html><title>Programming Ruby: The Pragmatic Programmer's Guide</title><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><STYLE TYPE="text/css"><!--
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</STYLE><table bgcolor="#a03030" cellpadding="3" border="0" cellspacing="0"><tr><td colspan="3"><table bgcolor="#902020" cellpadding="20"><tr><td><h1 class="header">Programming Ruby</h1><h3 class="subheader">The Pragmatic Programmer's Guide</h3></td></tr></table></td></tr><tr><td width="33%" align="left"><a class="subheader" href="ref_m_enumerable.html">Previous <</a></td><td width="33%" align="center" valign="middle"><a class="subheader" href="builtins.html">Contents ^</a><br></td><td width="33%" align="right"><a class="subheader" href="ref_m_filetest.html">Next ></a><br></td></tr></table></head><body bgcolor="white">
<!--
Copyright (c) 2001 by Addison Wesley Longman. This
material may be distributed only subject to the terms and
conditions set forth in the Open Publication License, v1.0 or
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http://www.opencontent.org/openpub/).
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<table><tr><td height="20"><img src="dot.gif" width="1" height="20"></td></tr></table><table border="0" width="100%" bgcolor="660066" cellpadding="10"><tr><td valign="center"><font color="white" size="7">module Errno</font></td></tr></table><p></p><H3>Index:</H3><p></p><hr>
<P></P>
Ruby exception objects are subclasses of <code>Exception</code>. However,
operating systems typically report errors using plain
integers. Module <code>Errno</code> is created dynamically to map these
operating system errors to Ruby classes, with each error number generating
its own subclass of <code>SystemCallError</code>. As the subclass is created
in module <code>Errno</code>, its name will start <code>Errno::</code>.
<P></P>
The names of the <code>Errno</code><code>::</code> classes depend on the environment in
which Ruby runs. On a typical Unix or Windows platform, there are
<code>Errno</code> classes such as <code>Errno::EACCES</code>,
<code>Errno::EAGAIN</code>, <code>Errno::EINTR</code>, and so on.
<P></P>
The integer operating system error number corresponding to a
particular error is available as the class constant
<code>Errno::</code><em>error</em><code>::Errno</code>.
<P></P>
<table bgcolor="#fff0f0" cellspacing="0" border="0" cellpadding="3" width="500">
<tr>
<td valign="top"><code>Errno::EACCES::Errno</code></td>
<td valign="top"></td>
<td valign="top"><code>13</code></td>
</tr>
<tr>
<td valign="top"><code>Errno::EAGAIN::Errno</code></td>
<td valign="top"></td>
<td valign="top"><code>11</code></td>
</tr>
<tr>
<td valign="top"><code>Errno::EINTR::Errno</code></td>
<td valign="top"></td>
<td valign="top"><code>4</code></td>
</tr>
</table>
<P></P>
<P></P>
The full list of operating system errors on your particular
platform are available as the constants of <code>Errno</code>.
<P></P>
<table bgcolor="#fff0f0" cellspacing="0" border="0" cellpadding="3" width="500">
<tr>
<td valign="top"><code>Errno.constants</code></td>
<td valign="top"></td>
<td valign="top"><code>E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, EADV, EAFNOSUPPORT, EAGAIN, ...</code></td>
</tr>
</table>
<P></P>
<P></P>
<p></p><hr><table bgcolor="#a03030" cellpadding="10" border="0" cellspacing="0"><tr><td width="33%" align="left"><a class="subheader" href="ref_m_enumerable.html">Previous <</a></td><td width="33%" align="center" valign="middle"><a class="subheader" href="builtins.html">Contents ^</a><br></td><td width="33%" align="right"><a class="subheader" href="ref_m_filetest.html">Next ></a><br></td></tr></table><p></p><font size="-1">Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"</font><br><font size="-3">
Copyright
©
2000 Addison Wesley Longman, Inc. Released under the terms of the
<a href="http://www.opencontent.org/openpub/">Open Publication License</a> V1.0.
<br>
This reference is available for
<a href="http://www.pragmaticprogrammer.com/ruby/downloads/book.html">download</a>.
</font></body></html>
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