open sockets from task_struct

open sockets from task_struct

[ratheesh k]

I have task_struct structure , how to find all the opened files ? how
to find opened sockets ?

Thanks,
Ratheesh

Re: open sockets from task_struct

[Jonathan Campbell]

(reposted because I remember kernel.org mentioning that HTML email is 
verboten or something like that---Sorry!)

I know that on the user-space side any open handles can be seen in the 
/proc/<pid>/fd directory (<pid> is whatever process you're interested in).
Assuming you're talking about reading this from kernel space, I'd look 
at what the procfs filesystem is doing and learn from that.
Sockets and block/char devices are listed like any other file, the list 
is based on file handles.

> I have task_struct structure , how to find all the opened files ? how
> to find opened sockets ?
>
> Thanks,
> Ratheesh
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>
>    

Re: open sockets from task_struct

[Jonathan Campbell]

Get the Linux kernel source and look at what the procfs filesystem is 
doing to get that information. Look under fs/proc.
fs/proc/base.c(2508) seems to contain the inode structures for 
/proc/pid/fd and /proc/pid/fdinfo, locate the inode operations
structure and locate the functions. Drill down through the function 
calls and you'll eventually find how to read what
file handles are open. A quick glance tells me that the calls go several 
layers deep including a call through a function pointer passed in one of 
the parameters, "instantiate", hopefully that won't be a problem for you.
> On Sun, Apr 18, 2010 at 12:53 PM, Jonathan Campbell<jon@nerdgrounds.com>  wrote:
>    
>> I know that on the user-space side any open handles can be seen in the
>> /proc/<pid>/fd directory (<pid>  is whatever process you're interested in).
>> Assuming you're talking about reading this from kernel space, I'd look at
>> what the procfs filesystem is doing and learn from that.
>> Sockets and block/char devices are listed like any other file, the list is
>> based on file handles.
>>      
>>> I have task_struct structure , how to find all the opened files ? how
>>> to find opened sockets ?
>>>
>>> Thanks,
>>> Ratheesh
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>> Please read the FAQ at  http://www.tux.org/lkml/
>>>
>>>
>>>
>>>        
>>
>>      
> I need it in kernel space and i am using  2.6.29.4 kernel .. could you
> please guide a little ?
>
>
>