119 lines
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119 lines
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<title>GDB/MI Simple Examples - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link rel="up" href="GDB_002fMI.html#GDB_002fMI" title="GDB/MI">
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<link rel="prev" href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" title="GDB/MI Output Records">
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<link rel="next" href="GDB_002fMI-Command-Description-Format.html#GDB_002fMI-Command-Description-Format" title="GDB/MI Command Description Format">
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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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<div class="node">
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<a name="GDB%2fMI-Simple-Examples"></a>
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<a name="GDB_002fMI-Simple-Examples"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="GDB_002fMI-Command-Description-Format.html#GDB_002fMI-Command-Description-Format">GDB/MI Command Description Format</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records">GDB/MI Output Records</a>,
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Up: <a rel="up" accesskey="u" href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>
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<hr>
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</div>
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<h3 class="section">27.6 Simple Examples of <span class="sc">gdb/mi</span> Interaction</h3>
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<p><a name="index-g_t_0040sc_007bgdb_002fmi_007d_002c-simple-examples-2979"></a>
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This subsection presents several simple examples of interaction using
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the <span class="sc">gdb/mi</span> interface. In these examples, ‘<samp><span class="samp">-></span></samp>’ means that the
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following line is passed to <span class="sc">gdb/mi</span> as input, while ‘<samp><span class="samp"><-</span></samp>’ means
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the output received from <span class="sc">gdb/mi</span>.
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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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<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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<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>
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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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<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>
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<h4 class="subheading">Quitting <span class="sc">gdb</span></h4>
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<p>Quitting <span class="sc">gdb</span> just prints the result class ‘<samp><span class="samp">^exit</span></samp>’.
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<pre class="smallexample"> -> (gdb)
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<- -gdb-exit
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<- ^exit
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</pre>
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<p>Please note that ‘<samp><span class="samp">^exit</span></samp>’ is printed immediately, but it might
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take some time for <span class="sc">gdb</span> to actually exit. During that time, <span class="sc">gdb</span>
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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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<span class="sc">gdb</span> exits and should only forcibly kill <span class="sc">gdb</span> if it
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fails to exit in reasonable time.
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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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<pre class="smallexample"> -> -rubbish
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<- ^error,msg="Undefined MI command: rubbish"
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<- (gdb)
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</pre>
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<!-- %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -->
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</body></html>
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