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| <a name="Simple-Examples-of-GDB_002fMI-Interaction"></a> |
| <h3 class="section">27.6 Simple Examples of <small>GDB/MI</small> Interaction</h3> |
| <a name="index-GDB_002fMI_002c-simple-examples"></a> |
| |
| <p>This subsection presents several simple examples of interaction using |
| the <small>GDB/MI</small> interface. In these examples, ‘<samp>-></samp>’ means that the |
| following line is passed to <small>GDB/MI</small> as input, while ‘<samp><-</samp>’ means |
| the output received from <small>GDB/MI</small>. |
| </p> |
| <p>Note the line breaks shown in the examples are here only for |
| readability, they don’t appear in the real output. |
| </p> |
| <a name="Setting-a-Breakpoint"></a> |
| <h4 class="subheading">Setting a Breakpoint</h4> |
| |
| <p>Setting a breakpoint generates synchronous output which contains detailed |
| information of the breakpoint. |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">-> -break-insert main |
| <- ^done,bkpt={number="1",type="breakpoint",disp="keep", |
| enabled="y",addr="0x08048564",func="main",file="myprog.c", |
| fullname="/home/nickrob/myprog.c",line="68",thread-groups=["i1"], |
| times="0"} |
| <- (gdb) |
| </pre></div> |
| |
| <a name="Program-Execution"></a> |
| <h4 class="subheading">Program Execution</h4> |
| |
| <p>Program execution generates asynchronous records and MI gives the |
| reason that execution stopped. |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">-> -exec-run |
| <- ^running |
| <- (gdb) |
| <- *stopped,reason="breakpoint-hit",disp="keep",bkptno="1",thread-id="0", |
| frame={addr="0x08048564",func="main", |
| args=[{name="argc",value="1"},{name="argv",value="0xbfc4d4d4"}], |
| file="myprog.c",fullname="/home/nickrob/myprog.c",line="68"} |
| <- (gdb) |
| -> -exec-continue |
| <- ^running |
| <- (gdb) |
| <- *stopped,reason="exited-normally" |
| <- (gdb) |
| </pre></div> |
| |
| <a name="Quitting-GDB-2"></a> |
| <h4 class="subheading">Quitting <small>GDB</small></h4> |
| |
| <p>Quitting <small>GDB</small> just prints the result class ‘<samp>^exit</samp>’. |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">-> (gdb) |
| <- -gdb-exit |
| <- ^exit |
| </pre></div> |
| |
| <p>Please note that ‘<samp>^exit</samp>’ is printed immediately, but it might |
| take some time for <small>GDB</small> to actually exit. During that time, <small>GDB</small> |
| performs necessary cleanups, including killing programs being debugged |
| or disconnecting from debug hardware, so the frontend should wait till |
| <small>GDB</small> exits and should only forcibly kill <small>GDB</small> if it |
| fails to exit in reasonable time. |
| </p> |
| <a name="A-Bad-Command"></a> |
| <h4 class="subheading">A Bad Command</h4> |
| |
| <p>Here’s what happens if you pass a non-existent command: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">-> -rubbish |
| <- ^error,msg="Undefined MI command: rubbish" |
| <- (gdb) |
| </pre></div> |
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