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138 lines
6.6 KiB
HTML
138 lines
6.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Attach (Debugging with GDB)</title>
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<meta name="description" content="Attach (Debugging with GDB)">
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<meta name="keywords" content="Attach (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Running.html#Running" rel="up" title="Running">
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<link href="Kill-Process.html#Kill-Process" rel="next" title="Kill Process">
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<link href="Input_002fOutput.html#Input_002fOutput" rel="prev" title="Input/Output">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Attach"></a>
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<div class="header">
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<p>
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Next: <a href="Kill-Process.html#Kill-Process" accesskey="n" rel="next">Kill Process</a>, Previous: <a href="Input_002fOutput.html#Input_002fOutput" accesskey="p" rel="prev">Input/Output</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</a> [<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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</div>
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<hr>
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<a name="Debugging-an-Already_002drunning-Process"></a>
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<h3 class="section">4.7 Debugging an Already-running Process</h3>
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<a name="index-attach-1"></a>
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<a name="index-attach"></a>
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<dl compact="compact">
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<dt><code>attach <var>process-id</var></code></dt>
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<dd><p>This command attaches to a running process—one that was started
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outside <small>GDB</small>. (<code>info files</code> shows your active
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targets.) The command takes as argument a process ID. The usual way to
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find out the <var>process-id</var> of a Unix process is with the <code>ps</code> utility,
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or with the ‘<samp>jobs -l</samp>’ shell command.
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</p>
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<p><code>attach</code> does not repeat if you press <tt class="key">RET</tt> a second time after
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executing the command.
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</p></dd>
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</dl>
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<p>To use <code>attach</code>, your program must be running in an environment
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which supports processes; for example, <code>attach</code> does not work for
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programs on bare-board targets that lack an operating system. You must
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also have permission to send the process a signal.
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</p>
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<p>When you use <code>attach</code>, the debugger finds the program running in
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the process first by looking in the current working directory, then (if
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the program is not found) by using the source file search path
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(see <a href="Source-Path.html#Source-Path">Specifying Source Directories</a>). You can also use
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the <code>file</code> command to load the program. See <a href="Files.html#Files">Commands to
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Specify Files</a>.
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</p>
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<p>The first thing <small>GDB</small> does after arranging to debug the specified
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process is to stop it. You can examine and modify an attached process
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with all the <small>GDB</small> commands that are ordinarily available when
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you start processes with <code>run</code>. You can insert breakpoints; you
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can step and continue; you can modify storage. If you would rather the
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process continue running, you may use the <code>continue</code> command after
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attaching <small>GDB</small> to the process.
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</p>
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<dl compact="compact">
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<dd><a name="index-detach"></a>
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</dd>
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<dt><code>detach</code></dt>
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<dd><p>When you have finished debugging the attached process, you can use the
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<code>detach</code> command to release it from <small>GDB</small> control. Detaching
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the process continues its execution. After the <code>detach</code> command,
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that process and <small>GDB</small> become completely independent once more, and you
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are ready to <code>attach</code> another process or start one with <code>run</code>.
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<code>detach</code> does not repeat if you press <tt class="key">RET</tt> again after
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executing the command.
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</p></dd>
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</dl>
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<p>If you exit <small>GDB</small> while you have an attached process, you detach
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that process. If you use the <code>run</code> command, you kill that process.
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By default, <small>GDB</small> asks for confirmation if you try to do either of these
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things; you can control whether or not you need to confirm by using the
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<code>set confirm</code> command (see <a href="Messages_002fWarnings.html#Messages_002fWarnings">Optional Warnings and
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Messages</a>).
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Kill-Process.html#Kill-Process" accesskey="n" rel="next">Kill Process</a>, Previous: <a href="Input_002fOutput.html#Input_002fOutput" accesskey="p" rel="prev">Input/Output</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</a> [<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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</div>
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</body>
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</html>
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