1<html lang="en"> 2<head> 3<title>Active Targets - 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="up" href="Targets.html#Targets" title="Targets"> 9<link rel="next" href="Target-Commands.html#Target-Commands" title="Target Commands"> 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="Active-Targets"></a> 42<p> 43Next: <a rel="next" accesskey="n" href="Target-Commands.html#Target-Commands">Target Commands</a>, 44Up: <a rel="up" accesskey="u" href="Targets.html#Targets">Targets</a> 45<hr> 46</div> 47 48<h3 class="section">19.1 Active Targets</h3> 49 50<p><a name="index-stacking-targets-1151"></a><a name="index-active-targets-1152"></a><a name="index-multiple-targets-1153"></a> 51There are multiple classes of targets such as: processes, executable files or 52recording sessions. Core files belong to the process class, making core file 53and process mutually exclusive. Otherwise, <span class="sc">gdb</span> can work concurrently 54on multiple active targets, one in each class. This allows you to (for 55example) start a process and inspect its activity, while still having access to 56the executable file after the process finishes. Or if you start process 57recording (see <a href="Reverse-Execution.html#Reverse-Execution">Reverse Execution</a>) and <code>reverse-step</code> there, you are 58presented a virtual layer of the recording target, while the process target 59remains stopped at the chronologically last point of the process execution. 60 61 <p>Use the <code>core-file</code> and <code>exec-file</code> commands to select a new core 62file or executable target (see <a href="Files.html#Files">Commands to Specify Files</a>). To 63specify as a target a process that is already running, use the <code>attach</code> 64command (see <a href="Attach.html#Attach">Debugging an Already-running Process</a>). 65 66 </body></html> 67 68