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Re: Linking with external lib


On 09/06/2016 02:08 PM, Mahmoud Hanafi wrote:
> 
> 
> On 09/06/2016 11:55 AM, David Smith wrote:
>> On 09/06/2016 01:37 PM, Mahmoud Hanafi wrote:
>>> In my stap script I have some embedded C function that needs to make
>>> some calls to external libraries. Is there I can link my script with the
>>> external libs? Or do i need to add all the code I need into my script.
>> Basically you can't. A systemtap script gets compiled into a kernel
>> module (assuming you are using the default 'linux' runtime). A kernel
>> module can't access *any* user library.
>>
>> Perhaps you should back up a bit and let us know what your external
>> library is trying to do.
>>
> The library is part of lustre. I need the functions that does address
> translation to string values.

Can you point me to the library/function on lustre.org that you are
interested in?

You can't really copy userspace C code into systemtap. Systemtap tries
very hard to handle memory accesses safely (since otherwise you can
crash the kernel). We might be able to "translate" the userspace C code
into embedded C.

-- 
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)


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