Re: [Valgrind-users] valgrind --db-attach=yes does not work un ubuntu10.10

[WAROQUIERS P. <phi...@eu...>]

 
>Does anybody have suggestion how to fix the problem in user space?
>
>I can easily imagine scenario where I would need to use 
>valgrind with debugger 
>on a machine, where I have no root access.

You might try the gdbserver patch
(http://bugs.kde.org/show_bug.cgi?id=214909)

With this patch, if you invoke the vgdb relay application 
with --max-invoke-ms=0, then no usage of ptrace is done.

In addition, it provides a fully debuggable process under valgrind
E.g. you can 
       put breaks,
       look at threads,
       call code from gdb,
       modify variables,
       invoke various valgrind tool client requests at any point
          (memleak search, make some memory defined or undefined, ...)
       ...

(the only drawback of --max-invoke-ms=0 is that you cannot connect to
the valgrind process to debug if it is blocked in a system call).


Note that the usage is slightly different of --db-attach=yes:
  You must give --vgdb=yes arg to valgrind
  and then you start a gdb in another window and do:
     gdb <your executable>
     target remote | vgdb --max-invoke-ms=0

--vgdb=yes valgrind arg indicates to run an gdbserver embedded in
valgrind.
The gdb target remote command above will "connect" to this gdbserver.

For more info, you can read coregrind/m_gdbserver/README_DEVELOPPERS
or do valgrind --help
or (inside gdb, when connected) use:    monitor help
(the embedded valgrind gdbserver will provide a help for the requests
it understands).




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