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154 lines
6.5 KiB
HTML
154 lines
6.5 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>GDB/MI Simple Examples (Debugging with GDB)</title>
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<meta name="description" content="GDB/MI Simple Examples (Debugging with GDB)">
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<meta name="keywords" content="GDB/MI Simple Examples (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="GDB_002fMI.html#GDB_002fMI" rel="up" title="GDB/MI">
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<link href="GDB_002fMI-Command-Description-Format.html#GDB_002fMI-Command-Description-Format" rel="next" title="GDB/MI Command Description Format">
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<link href="GDB_002fMI-Ada-Exception-Information.html#GDB_002fMI-Ada-Exception-Information" rel="prev" title="GDB/MI Ada Exception Information">
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<style type="text/css">
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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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="GDB_002fMI-Simple-Examples"></a>
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<div class="header">
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<p>
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Next: <a href="GDB_002fMI-Command-Description-Format.html#GDB_002fMI-Command-Description-Format" accesskey="n" rel="next">GDB/MI Command Description Format</a>, Previous: <a href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" accesskey="p" rel="prev">GDB/MI Output Records</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</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="Simple-Examples-of-GDB_002fMI-Interaction"></a>
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<h3 class="section">27.6 Simple Examples of <small>GDB/MI</small> Interaction</h3>
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<a name="index-GDB_002fMI_002c-simple-examples"></a>
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<p>This subsection presents several simple examples of interaction using
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the <small>GDB/MI</small> interface. In these examples, ‘<samp>-></samp>’ means that the
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following line is passed to <small>GDB/MI</small> as input, while ‘<samp><-</samp>’ means
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the output received from <small>GDB/MI</small>.
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</p>
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<p>Note the line breaks shown in the examples are here only for
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readability, they don’t appear in the real output.
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</p>
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<a name="Setting-a-Breakpoint"></a>
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<h4 class="subheading">Setting a Breakpoint</h4>
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<p>Setting a breakpoint generates synchronous output which contains detailed
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information of the breakpoint.
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</p>
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<div class="smallexample">
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<pre class="smallexample">-> -break-insert main
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<- ^done,bkpt={number="1",type="breakpoint",disp="keep",
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enabled="y",addr="0x08048564",func="main",file="myprog.c",
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fullname="/home/nickrob/myprog.c",line="68",thread-groups=["i1"],
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times="0"}
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<- (gdb)
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</pre></div>
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<a name="Program-Execution"></a>
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<h4 class="subheading">Program Execution</h4>
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<p>Program execution generates asynchronous records and MI gives the
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reason that execution stopped.
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</p>
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<div class="smallexample">
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<pre class="smallexample">-> -exec-run
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<- ^running
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<- (gdb)
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<- *stopped,reason="breakpoint-hit",disp="keep",bkptno="1",thread-id="0",
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frame={addr="0x08048564",func="main",
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args=[{name="argc",value="1"},{name="argv",value="0xbfc4d4d4"}],
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file="myprog.c",fullname="/home/nickrob/myprog.c",line="68",
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arch="i386:x86_64"}
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<- (gdb)
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-> -exec-continue
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<- ^running
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<- (gdb)
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<- *stopped,reason="exited-normally"
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<- (gdb)
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</pre></div>
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<a name="Quitting-GDB-2"></a>
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<h4 class="subheading">Quitting <small>GDB</small></h4>
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<p>Quitting <small>GDB</small> just prints the result class ‘<samp>^exit</samp>’.
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</p>
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<div class="smallexample">
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<pre class="smallexample">-> (gdb)
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<- -gdb-exit
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<- ^exit
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</pre></div>
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<p>Please note that ‘<samp>^exit</samp>’ is printed immediately, but it might
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take some time for <small>GDB</small> to actually exit. During that time, <small>GDB</small>
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performs necessary cleanups, including killing programs being debugged
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or disconnecting from debug hardware, so the frontend should wait till
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<small>GDB</small> exits and should only forcibly kill <small>GDB</small> if it
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fails to exit in reasonable time.
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</p>
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<a name="A-Bad-Command"></a>
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<h4 class="subheading">A Bad Command</h4>
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<p>Here’s what happens if you pass a non-existent command:
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</p>
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<div class="smallexample">
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<pre class="smallexample">-> -rubbish
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<- ^error,msg="Undefined MI command: rubbish"
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<- (gdb)
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</pre></div>
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</body>
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</html>
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