[Bug breakpoints/12958] How to set a breakpoint at the exit of a function?

["wuchengping at h3c dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12958

--- Comment #3 from 伍成平 <wuchengping at h3c dot com> 2011-07-06 03:44:40 UTC ---
(In reply to comment #1)
> (In reply to comment #0)
> > I know how to set a breakpoint at the begin of a function.it is "break
> > function_name",but how to set a breakpoint at the exit/end of a function?
> you can dissembly the function in gdb, and get the address of exit/end of a
> function, then you can set breakpoint on that address, for example, "b
> *0x123456".

yes,I can set a breakpoint at the exit of a function in this way,but it can
only be used once, because when I modified my code,the exit address of the
function will also change,so I must modify "the gdb command file"
synchronously.I use the gdb command in this way "gdb -p $(pidof vmserver) -x
cmd.txt",and the gdb command lies in the file(cmd.txt).the file content is:
    b CDeviceMgr::queryPhyDevsInDomain
    command
    silent
    p pcUserCode
    c
    end

    c
In this way,I can watch the input parameters of the function,but how to watch
the output parameters?
I hope that I can set the exit breakpoint as simple as the entrance
breakpoint.The most important thing is that I hope,when I modified my code,the
gdb command file will be no need to modify synchronously.

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