1<html lang="en"> 2<head> 3<title>Stopping - Debugging with GDB</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Debugging with GDB"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="prev" href="Running.html#Running" title="Running"> 9<link rel="next" href="Reverse-Execution.html#Reverse-Execution" title="Reverse Execution"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 131998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 14Free Software Foundation, Inc. 15 16Permission is granted to copy, distribute and/or modify this document 17under the terms of the GNU Free Documentation License, Version 1.3 or 18any later version published by the Free Software Foundation; with the 19Invariant Sections being ``Free Software'' and ``Free Software Needs 20Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 21and with the Back-Cover Texts as in (a) below. 22 23(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 24this GNU Manual. Buying copies from GNU Press supports the FSF in 25developing GNU and promoting software freedom.''--> 26<meta http-equiv="Content-Style-Type" content="text/css"> 27<style type="text/css"><!-- 28 pre.display { font-family:inherit } 29 pre.format { font-family:inherit } 30 pre.smalldisplay { font-family:inherit; font-size:smaller } 31 pre.smallformat { font-family:inherit; font-size:smaller } 32 pre.smallexample { font-size:smaller } 33 pre.smalllisp { font-size:smaller } 34 span.sc { font-variant:small-caps } 35 span.roman { font-family:serif; font-weight:normal; } 36 span.sansserif { font-family:sans-serif; font-weight:normal; } 37--></style> 38<link rel="stylesheet" type="text/css" href="../cs.css"> 39</head> 40<body> 41<div class="node"> 42<a name="Stopping"></a> 43<p> 44Next: <a rel="next" accesskey="n" href="Reverse-Execution.html#Reverse-Execution">Reverse Execution</a>, 45Previous: <a rel="previous" accesskey="p" href="Running.html#Running">Running</a>, 46Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> 47<hr> 48</div> 49 50<h2 class="chapter">5 Stopping and Continuing</h2> 51 52<p>The principal purposes of using a debugger are so that you can stop your 53program before it terminates; or so that, if your program runs into 54trouble, you can investigate and find out why. 55 56 <p>Inside <span class="sc">gdb</span>, your program may stop for any of several reasons, 57such as a signal, a breakpoint, or reaching a new line after a 58<span class="sc">gdb</span> command such as <code>step</code>. You may then examine and 59change variables, set new breakpoints or remove old ones, and then 60continue execution. Usually, the messages shown by <span class="sc">gdb</span> provide 61ample explanation of the status of your program—but you can also 62explicitly request this information at any time. 63 64 65<a name="index-info-program-198"></a> 66<dl><dt><code>info program</code><dd>Display information about the status of your program: whether it is 67running or not, what process it is, and why it stopped. 68</dl> 69 70<ul class="menu"> 71<li><a accesskey="1" href="Breakpoints.html#Breakpoints">Breakpoints</a>: Breakpoints, watchpoints, and catchpoints 72<li><a accesskey="2" href="Continuing-and-Stepping.html#Continuing-and-Stepping">Continuing and Stepping</a>: Resuming execution 73<li><a accesskey="3" href="Signals.html#Signals">Signals</a>: Signals 74<li><a accesskey="4" href="Thread-Stops.html#Thread-Stops">Thread Stops</a>: Stopping and starting multi-thread programs 75</ul> 76 77 </body></html> 78 79