tlug: debugging shared objects

[Marcus Metzler <mocm@example.com>]

Scott Stone writes:
 > 
 > OK, if I have a known-stable program A and an in-development shared object
 > B, which is designed to be dlopen()'ed by A, how do I set breakpoints
 > inside object B's code with GDB?  ie, everything is built with -g and is
 > not stripped.. so I run 'gdb A' and then...?  What's the command to set
 > the breakpoint inside the code for shared object module B?
 > 
You should be able to set a breakpoint via the name of one of the
subroutines in module B, i.e. b subroutine. Then you can run the
program until it gets to that subroutine and it should show you the
line numbers of module B when you use list. Then you can set the
breakpoint by using line numbers. I think it is also possible to tell
gdb to "load" the source code of module B and than use "b linenumber"
to set the breakpoint, but I haven`t tried that.

Marcus

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Dr. Marcus Metzler
ZPR
Universitaet zu Koeln              Tel.   : +49 221 470 6039
Weyertal 80                        Fax    : +49 221 470 5160
D-50931 Koeln, Germany             e-mail : mocm@example.com
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