### 27.6 Simple Examples of gdb/mi Interaction

This subsection presents several simple examples of interaction using the gdb/mi interface. In these examples, ‘`->`’ means that the following line is passed to gdb/mi as input, while ‘`<-`’ means the output received from gdb/mi.

Note the line breaks shown in the examples are here only for readability, they don't appear in the real output.

#### Setting a Breakpoint

Setting a breakpoint generates synchronous output which contains detailed information of the breakpoint.

         -> -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)

#### Program Execution

Program execution generates asynchronous records and MI gives the reason that execution stopped.

         -> -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)

#### Quitting gdb

Quitting gdb just prints the result class ‘`^exit`’.

         -> (gdb)
         <- -gdb-exit
         <- ^exit

#### A Bad Command

Here's what happens if you pass a non-existent command:

         -> -rubbish
         <- ^error,msg="Undefined MI command: rubbish"
         <- (gdb)