Source a python script to gdb plugin?

Source a python script to gdb plugin?

[Neo Jia]

hi,

I am going to source the following script through gdb plugin, but it
doesn't work.

#!/usr/bin/python

from ctypes import *
cdll.LoadLibrary("libc.so.6")
libc = CDLL("libc.so.6")
libc.printf("%d\n", 100)

Any suggestions?

Thanks,
Neo

-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

Re: Source a python script to gdb plugin?

[Tom Tromey]

>>>>> "Neo" == Neo Jia <neojia@gmail.com> writes:

Neo> I am going to source the following script through gdb plugin, but it
Neo> doesn't work.

Neo> Any suggestions?

That isn't enough information.  What platform is this?  What version
of Python are you using?  How did it fail?  Does it work with the
ordinary python interpreter?

Tom

Re: Source a python script to gdb plugin?

[Neo Jia]

On Thu, Aug 7, 2008 at 7:02 AM, Tom Tromey <tromey@redhat.com> wrote:
>>>>>> "Neo" == Neo Jia <neojia@gmail.com> writes:
>
> Neo> I am going to source the following script through gdb plugin, but it
> Neo> doesn't work.
>
> Neo> Any suggestions?
>
> That isn't enough information.  What platform is this?  What version
> of Python are you using?  How did it fail?  Does it work with the
> ordinary python interpreter?

Linux x86_64. Python is 2.5.1.

> /opt/gdb_plugin/bin/gdb
GNU gdb (GDB) 6.8.50.20080716-cvs
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) source ./load_libc
/home/cjia/workareas/gdb_nvwatch/scripts/load_libc:3: Error in sourced command f
ile:
Undefined command: "from".  Try "help".
(gdb)

execute the script out of the gdb.

> ./load_libc
100

Thanks,
Neo

>
> Tom
>



-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

Re: Source a python script to gdb plugin?

[Paul Pluzhnikov]

On Thu, Aug 7, 2008 at 10:00 AM, Neo Jia <neojia@gmail.com> wrote:

> (gdb) source ./load_libc
> /home/cjia/workareas/gdb_nvwatch/scripts/load_libc:3: Error in sourced command file:
> Undefined command: "from".  Try "help".

Don't you want to switch to python interpreter before doing 'source'
(or rather its python equivalent)?


-- 
Paul Pluzhnikov

Re: Source a python script to gdb plugin?

[Tom Tromey]

>>>>> "Paul" == Paul Pluzhnikov <ppluzhnikov@google.com> writes:

>> (gdb) source ./load_libc
>> /home/cjia/workareas/gdb_nvwatch/scripts/load_libc:3: Error in sourced command file:
>> Undefined command: "from".  Try "help".

Paul> Don't you want to switch to python interpreter before doing 'source'
Paul> (or rather its python equivalent)?

Yes.  The "source" command remains unchanged -- it reads gdb command
scripts.

Tom

Re: Source a python script to gdb plugin?

[Neo Jia]

On Thu, Aug 7, 2008 at 10:12 AM, Tom Tromey <tromey@redhat.com> wrote:
>>>>>> "Paul" == Paul Pluzhnikov <ppluzhnikov@google.com> writes:
>
>>> (gdb) source ./load_libc
>>> /home/cjia/workareas/gdb_nvwatch/scripts/load_libc:3: Error in sourced command file:
>>> Undefined command: "from".  Try "help".
>
> Paul> Don't you want to switch to python interpreter before doing 'source'
> Paul> (or rather its python equivalent)?
>
> Yes.  The "source" command remains unchanged -- it reads gdb command
> scripts.
> /opt/gdb_plugin/bin/gdb
GNU gdb (GDB) 6.8.50.20080716-cvs
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) python ./load_libc
  File "<string>", line 1
    ./load_libc
    ^
SyntaxError: invalid syntax
(gdb)

Is this the right way to use it?

Thanks,
Neo

>
> Tom
>



-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!

Re: Source a python script to gdb plugin?

[Tom Tromey]

>>>>> "Neo" == Neo Jia <neojia@gmail.com> writes:

Neo> (gdb) python ./load_libc
Neo>   File "<string>", line 1
Neo>     ./load_libc
Neo>     ^
Neo> SyntaxError: invalid syntax

Neo> Is this the right way to use it?

Nope, try:

python execfile('./load_libc')

Anything after "python" is passed directly to the python interpreter.

Tom

Re: Source a python script to gdb plugin?

[Neo Jia]

On Thu, Aug 7, 2008 at 12:16 PM, Tom Tromey <tromey@redhat.com> wrote:
>>>>>> "Neo" == Neo Jia <neojia@gmail.com> writes:
>
> Neo> (gdb) python ./load_libc
> Neo>   File "<string>", line 1
> Neo>     ./load_libc
> Neo>     ^
> Neo> SyntaxError: invalid syntax
>
> Neo> Is this the right way to use it?
>
> Nope, try:
>
> python execfile('./load_libc')

This works! Thanks a lot!

Neo

>
> Anything after "python" is passed directly to the python interpreter.
>
> Tom
>



-- 
I would remember that if researchers were not ambitious
probably today we haven't the technology we are using!