ceph/src/boost/libs/exception/doc/errinfo_errno.html

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  17 <h1>Boost Exception</h1>
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  19 <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
  20 <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
  21 <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
  22 <div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>errinfo_errno</h3>
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  24 <div class="RenoIncludeDIV"><p><span class="RenoEscape">&#35;<!--<wiki>`&#35;</wiki>--></span>include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_errno_hpp.html">boost/exception/errinfo_errno.hpp</a></span>&gt;</p>
  25 <div class="RenoIncludeDIV"><pre>#include &lt;<span class="RenoLink"><a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a></span>&gt;
  26 #include &lt;errno.h&gt;
  27
  28 namespace
  29 boost
  30     {
  31 <span class="RenoIncludeSPAN">    <span class="RenoIncludeSPAN">typedef <span class="RenoLink"><a href="error_info.html">error_info</a></span>&lt;struct errinfo_errno_,int&gt; <span class="RenoLink">errinfo_errno</span>;</span></span>
  32     }</pre>
  33 </div></div><p>This type is designed to be used as a standard <span class="RenoLink"><a href="error_info.html">error_info</a></span> instance for transporting a relevant errno value in exceptions deriving from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>.</p>
  34 <h3>Example:</h3>
  35 <div class="RenoIncludeDIV"><pre>#include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_api_function_hpp.html">boost/exception/errinfo_api_function.hpp</a></span>&gt;
  36 #include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_at_line_hpp.html">boost/exception/errinfo_at_line.hpp</a></span>&gt;
  37 #include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_errno_hpp.html">boost/exception/errinfo_errno.hpp</a></span>&gt;
  38 #include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_handle_hpp.html">boost/exception/errinfo_file_handle.hpp</a></span>&gt;
  39 #include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_name_hpp.html">boost/exception/errinfo_file_name.hpp</a></span>&gt;
  40 #include &lt;<span class="RenoLink"><a href="boost_exception_errinfo_file_open_mode_hpp.html">boost/exception/errinfo_file_open_mode.hpp</a></span>&gt;
  41 #include &lt;<span class="RenoLink"><a href="boost_exception_info_hpp.html">boost/exception/info.hpp</a></span>&gt;
  42 #include &lt;<span class="RenoLink"><a href="boost_throw_exception_hpp.html">boost/throw_exception.hpp</a></span>&gt;
  43 #include &lt;boost/shared_ptr.hpp&gt;
  44 #include &lt;boost/weak_ptr.hpp&gt;
  45 #include &lt;stdio.h&gt;
  46 #include &lt;errno.h&gt;
  47 #include &lt;exception&gt;
  48
  49 struct error : virtual std::exception, virtual boost::<span class="RenoLink"><a href="exception.html">exception</a></span> { };
  50 struct file_error : virtual error { };
  51 struct file_open_error: virtual file_error { };
  52 struct file_read_error: virtual file_error { };
  53
  54 boost::shared_ptr&lt;FILE&gt;
  55 open_file( char const * file, char const * mode )
  56     {
  57     if( FILE * f=fopen(file,mode) )
  58         return boost::shared_ptr&lt;FILE&gt;(f,fclose);
  59     else
  60         <span class="RenoLink"><a href="BOOST_THROW_EXCEPTION.html">BOOST_THROW_EXCEPTION</a></span>(
  61             file_open_error() &lt;&lt;
  62             boost::<span class="RenoLink"><a href="errinfo_api_function.html">errinfo_api_function</a></span>("fopen") &lt;&lt;
  63             boost::<span class="RenoLink">errinfo_errno</span>(errno) &lt;&lt;
  64             boost::<span class="RenoLink"><a href="errinfo_file_name.html">errinfo_file_name</a></span>(file) &lt;&lt;
  65             boost::<span class="RenoLink"><a href="errinfo_file_open_mode.html">errinfo_file_open_mode</a></span>(mode) );
  66     }
  67
  68 size_t
  69 read_file( boost::shared_ptr&lt;FILE&gt; const &amp; f, void * buf, size_t size )
  70     {
  71     size_t nr=fread(buf,1,size,f.get());
  72     if( ferror(f.get()) )
  73         <span class="RenoLink"><a href="BOOST_THROW_EXCEPTION.html">BOOST_THROW_EXCEPTION</a></span>(
  74             file_read_error() &lt;&lt;
  75             boost::<span class="RenoLink"><a href="errinfo_api_function.html">errinfo_api_function</a></span>("fread") &lt;&lt;
  76             boost::<span class="RenoLink">errinfo_errno</span>(errno) &lt;&lt;
  77             boost::<span class="RenoLink"><a href="errinfo_file_handle.html">errinfo_file_handle</a></span>(f) );
  78     return nr;
  79     }</pre>
  80 </div></div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
  81 See also: <span class="RenoPageList"><a href="boost_exception_errinfo_errno_hpp.html">boost/exception/errinfo_errno.hpp</a>&nbsp;| <a href="frequently_asked_questions.html">Frequently Asked Questions</a></span>
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  83 <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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  85 <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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