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SignalHandler.html

SignalHandler.html 6.7 KB
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  4. <title>Signal handler requirements</title>
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  18. <div class="section">
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  19. <div class="titlepage"><div><div><h3 class="title">
    20. 

  20. <a name="asio.reference.SignalHandler"></a><a class="link" href="SignalHandler.html" title="Signal handler requirements">Signal handler requirements</a>
    21. 

  21. </h3></div></div></div>
    22. 

  22. <p>
    23. 

  23.         A signal handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
    24. 

  24.         A value <code class="computeroutput"><span class="identifier">h</span></code> of a signal handler
    25. 

  25.         class should work correctly in the expression <code class="computeroutput"><span class="identifier">h</span><span class="special">(</span><span class="identifier">ec</span><span class="special">,</span>
    26. 

  26.         <span class="identifier">n</span><span class="special">)</span></code>,
    27. 

  27.         where <code class="computeroutput"><span class="identifier">ec</span></code> is an lvalue of
    28. 

  28.         type <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">error_code</span></code>
    29. 

  29.         and <code class="computeroutput"><span class="identifier">n</span></code> is an lvalue of type
    30. 

  30.         <code class="computeroutput"><span class="keyword">const</span> <span class="keyword">int</span></code>.
    31. 

  31.       </p>
    32. 

  32. <h5>
    33. 

  33. <a name="asio.reference.SignalHandler.h0"></a>
    34. 

  34.         <span><a name="asio.reference.SignalHandler.examples"></a></span><a class="link" href="SignalHandler.html#asio.reference.SignalHandler.examples">Examples</a>
    35. 

  35.       </h5>
    36. 

  36. <p>
    37. 

  37.         A free function as a signal handler:
    38. 

  38.       </p>
    39. 

  39. <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">signal_handler</span><span class="special">(</span>
    40. 

  40.     <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">,</span>
    41. 

  41.     <span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span>
    42. 

  42. <span class="special">{</span>
    43. 

  43.   <span class="special">...</span>
    44. 

  44. <span class="special">}</span>
    45. 

  45. </pre>
    46. 

  46. <p>
    47. 

  47.         A signal handler function object:
    48. 

  48.       </p>
    49. 

  49. <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">signal_handler</span>
    50. 

  50. <span class="special">{</span>
    51. 

  51.   <span class="special">...</span>
    52. 

  52.   <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span>
    53. 

  53.       <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">,</span>
    54. 

  54.       <span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span>
    55. 

  55.   <span class="special">{</span>
    56. 

  56.     <span class="special">...</span>
    57. 

  57.   <span class="special">}</span>
    58. 

  58.   <span class="special">...</span>
    59. 

  59. <span class="special">};</span>
    60. 

  60. </pre>
    61. 

  61. <p>
    62. 

  62.         A non-static class member function adapted to a signal handler using <code class="computeroutput"><span class="identifier">bind</span><span class="special">()</span></code>:
    63. 

  63.       </p>
    64. 

  64. <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">my_class</span><span class="special">::</span><span class="identifier">signal_handler</span><span class="special">(</span>
    65. 

  65.     <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">,</span>
    66. 

  66.     <span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span>
    67. 

  67. <span class="special">{</span>
    68. 

  68.   <span class="special">...</span>
    69. 

  69. <span class="special">}</span>
    70. 

  70. <span class="special">...</span>
    71. 

  71. <span class="identifier">my_signal_set</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
    72. 

  72.     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">my_class</span><span class="special">::</span><span class="identifier">signal_handler</span><span class="special">,</span>
    73. 

  73.       <span class="keyword">this</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">,</span>
    74. 

  74.       <span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">signal_number</span><span class="special">));</span>
    75. 

  75. </pre>
    76. 

  76. </div>
    77. 

  77. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    78. 

  78. <td align="left"></td>
    79. 

  79. <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
    80. 

  80.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    81. 

  81.         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    82. 

  82.       </p>
    83. 

  83. </div></td>
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