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  16. <title>Stopping (Debugging with GDB)</title>
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  57. <a name="Stopping"></a>
  58. <div class="header">
  59. <p>
  60. Next: <a href="Reverse-Execution.html#Reverse-Execution" accesskey="n" rel="next">Reverse Execution</a>, Previous: <a href="Running.html#Running" accesskey="p" rel="prev">Running</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
  61. </div>
  62. <hr>
  63. <a name="Stopping-and-Continuing"></a>
  64. <h2 class="chapter">5 Stopping and Continuing</h2>
  65. <p>The principal purposes of using a debugger are so that you can stop your
  66. program before it terminates; or so that, if your program runs into
  67. trouble, you can investigate and find out why.
  68. </p>
  69. <p>Inside <small>GDB</small>, your program may stop for any of several reasons,
  70. such as a signal, a breakpoint, or reaching a new line after a
  71. <small>GDB</small> command such as <code>step</code>. You may then examine and
  72. change variables, set new breakpoints or remove old ones, and then
  73. continue execution. Usually, the messages shown by <small>GDB</small> provide
  74. ample explanation of the status of your program&mdash;but you can also
  75. explicitly request this information at any time.
  76. </p>
  77. <dl compact="compact">
  78. <dd><a name="index-info-program"></a>
  79. </dd>
  80. <dt><code>info program</code></dt>
  81. <dd><p>Display information about the status of your program: whether it is
  82. running or not, what process it is, and why it stopped.
  83. </p></dd>
  84. </dl>
  85. <table class="menu" border="0" cellspacing="0">
  86. <tr><td align="left" valign="top">&bull; <a href="Breakpoints.html#Breakpoints" accesskey="1">Breakpoints</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Breakpoints, watchpoints, and catchpoints
  87. </td></tr>
  88. <tr><td align="left" valign="top">&bull; <a href="Continuing-and-Stepping.html#Continuing-and-Stepping" accesskey="2">Continuing and Stepping</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Resuming execution
  89. </td></tr>
  90. <tr><td align="left" valign="top">&bull; <a href="Skipping-Over-Functions-and-Files.html#Skipping-Over-Functions-and-Files" accesskey="3">Skipping Over Functions and Files</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
  91. Skipping over functions and files
  92. </td></tr>
  93. <tr><td align="left" valign="top">&bull; <a href="Signals.html#Signals" accesskey="4">Signals</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Signals
  94. </td></tr>
  95. <tr><td align="left" valign="top">&bull; <a href="Thread-Stops.html#Thread-Stops" accesskey="5">Thread Stops</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Stopping and starting multi-thread programs
  96. </td></tr>
  97. </table>
  98. </body>
  99. </html>