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) 1988-2013 Free Software Foundation, Inc. 13 14Permission is granted to copy, distribute and/or modify this document 15under the terms of the GNU Free Documentation License, Version 1.3 or 16any later version published by the Free Software Foundation; with the 17Invariant Sections being ``Free Software'' and ``Free Software Needs 18Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 19and with the Back-Cover Texts as in (a) below. 20 21(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 22this GNU Manual. Buying copies from GNU Press supports the FSF in 23developing GNU and promoting software freedom.'' 24--> 25<meta http-equiv="Content-Style-Type" content="text/css"> 26<style type="text/css"><!-- 27 pre.display { font-family:inherit } 28 pre.format { font-family:inherit } 29 pre.smalldisplay { font-family:inherit; font-size:smaller } 30 pre.smallformat { font-family:inherit; font-size:smaller } 31 pre.smallexample { font-size:smaller } 32 pre.smalllisp { font-size:smaller } 33 span.sc { font-variant:small-caps } 34 span.roman { font-family:serif; font-weight:normal; } 35 span.sansserif { font-family:sans-serif; font-weight:normal; } 36--></style> 37<link rel="stylesheet" type="text/css" href="../cs.css"> 38</head> 39<body> 40<div class="node"> 41<a name="Stopping"></a> 42<p> 43Next: <a rel="next" accesskey="n" href="Reverse-Execution.html#Reverse-Execution">Reverse Execution</a>, 44Previous: <a rel="previous" accesskey="p" href="Running.html#Running">Running</a>, 45Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> 46<hr> 47</div> 48 49<h2 class="chapter">5 Stopping and Continuing</h2> 50 51<p>The principal purposes of using a debugger are so that you can stop your 52program before it terminates; or so that, if your program runs into 53trouble, you can investigate and find out why. 54 55 <p>Inside <span class="sc">gdb</span>, your program may stop for any of several reasons, 56such as a signal, a breakpoint, or reaching a new line after a 57<span class="sc">gdb</span> command such as <code>step</code>. You may then examine and 58change variables, set new breakpoints or remove old ones, and then 59continue execution. Usually, the messages shown by <span class="sc">gdb</span> provide 60ample explanation of the status of your program—but you can also 61explicitly request this information at any time. 62 63 64<a name="index-info-program-205"></a> 65<dl><dt><code>info program</code><dd>Display information about the status of your program: whether it is 66running or not, what process it is, and why it stopped. 67</dl> 68 69<ul class="menu"> 70<li><a accesskey="1" href="Breakpoints.html#Breakpoints">Breakpoints</a>: Breakpoints, watchpoints, and catchpoints 71<li><a accesskey="2" href="Continuing-and-Stepping.html#Continuing-and-Stepping">Continuing and Stepping</a>: Resuming execution 72<li><a accesskey="3" href="Skipping-Over-Functions-and-Files.html#Skipping-Over-Functions-and-Files">Skipping Over Functions and Files</a> 73 Skipping over functions and files 74<li><a accesskey="4" href="Signals.html#Signals">Signals</a>: Signals 75<li><a accesskey="5" href="Thread-Stops.html#Thread-Stops">Thread Stops</a>: Stopping and starting multi-thread programs 76</ul> 77 78 </body></html> 79 80