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| <h3 class="section">27.6 Simple Examples of <span class="sc">gdb/mi</span> Interaction</h3> |
| |
| <p><a name="index-g_t_0040sc_007bgdb_002fmi_007d_002c-simple-examples-2029"></a> |
| This subsection presents several simple examples of interaction using |
| the <span class="sc">gdb/mi</span> interface. In these examples, ‘<samp><span class="samp">-></span></samp>’ means that the |
| following line is passed to <span class="sc">gdb/mi</span> as input, while ‘<samp><span class="samp"><-</span></samp>’ means |
| the output received from <span class="sc">gdb/mi</span>. |
| |
| <p>Note the line breaks shown in the examples are here only for |
| readability, they don't appear in the real output. |
| |
| <h4 class="subheading">Setting a Breakpoint</h4> |
| |
| <p>Setting a breakpoint generates synchronous output which contains detailed |
| information of the breakpoint. |
| |
| <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",times="0"} |
| <- (gdb) |
| </pre> |
| <h4 class="subheading">Program Execution</h4> |
| |
| <p>Program execution generates asynchronous records and MI gives the |
| reason that execution stopped. |
| |
| <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> |
| <h4 class="subheading">Quitting <span class="sc">gdb</span></h4> |
| |
| <p>Quitting <span class="sc">gdb</span> just prints the result class ‘<samp><span class="samp">^exit</span></samp>’. |
| |
| <pre class="smallexample"> -> (gdb) |
| <- -gdb-exit |
| <- ^exit |
| </pre> |
| <p>Please note that ‘<samp><span class="samp">^exit</span></samp>’ is printed immediately, but it might |
| take some time for <span class="sc">gdb</span> to actually exit. During that time, <span class="sc">gdb</span> |
| performs necessary cleanups, including killing programs being debugged |
| or disconnecting from debug hardware, so the frontend should wait till |
| <span class="sc">gdb</span> exits and should only forcibly kill <span class="sc">gdb</span> if it |
| fails to exit in reasonable time. |
| |
| <h4 class="subheading">A Bad Command</h4> |
| |
| <p>Here's what happens if you pass a non-existent command: |
| |
| <pre class="smallexample"> -> -rubbish |
| <- ^error,msg="Undefined MI command: rubbish" |
| <- (gdb) |
| </pre> |
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