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  16. <title>Altering (Debugging with GDB)</title>
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  57. <a name="Altering"></a>
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  59. <p>
  60. Next: <a href="GDB-Files.html#GDB-Files" accesskey="n" rel="next">GDB Files</a>, Previous: <a href="Symbols.html#Symbols" accesskey="p" rel="prev">Symbols</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>
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  63. <a name="Altering-Execution"></a>
  64. <h2 class="chapter">17 Altering Execution</h2>
  65. <p>Once you think you have found an error in your program, you might want to
  66. find out for certain whether correcting the apparent error would lead to
  67. correct results in the rest of the run. You can find the answer by
  68. experiment, using the <small>GDB</small> features for altering execution of the
  69. program.
  70. </p>
  71. <p>For example, you can store new values into variables or memory
  72. locations, give your program a signal, restart it at a different
  73. address, or even return prematurely from a function.
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  75. <table class="menu" border="0" cellspacing="0">
  76. <tr><td align="left" valign="top">&bull; <a href="Assignment.html#Assignment" accesskey="1">Assignment</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Assignment to variables
  77. </td></tr>
  78. <tr><td align="left" valign="top">&bull; <a href="Jumping.html#Jumping" accesskey="2">Jumping</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Continuing at a different address
  79. </td></tr>
  80. <tr><td align="left" valign="top">&bull; <a href="Signaling.html#Signaling" accesskey="3">Signaling</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Giving your program a signal
  81. </td></tr>
  82. <tr><td align="left" valign="top">&bull; <a href="Returning.html#Returning" accesskey="4">Returning</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Returning from a function
  83. </td></tr>
  84. <tr><td align="left" valign="top">&bull; <a href="Calling.html#Calling" accesskey="5">Calling</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Calling your program&rsquo;s functions
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  86. <tr><td align="left" valign="top">&bull; <a href="Patching.html#Patching" accesskey="6">Patching</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Patching your program
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  88. <tr><td align="left" valign="top">&bull; <a href="Compiling-and-Injecting-Code.html#Compiling-and-Injecting-Code" accesskey="7">Compiling and Injecting Code</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compiling and injecting code in <small>GDB</small>
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