 | | | implementation of recv() and send() | implementation of recv() and send() 2004-06-15 - By Tsakiridis Antonis
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On Tue, 15 Jun 2004 20:25:00 +0530 (IST), K S SUNDEEP REDDY
<sundeep@(protected)> wrote:
As far as the location of recv() and send() is concerned, I guess you 'll
have to do some more searching since I do not remember....
For the second matter:
When kernel code is executed as part of a user space process, the task
struct of the current process is pointed by
the "current" pointer. Hence, you can access the current processes id from
your module like this:
current->pid
Below, I attach an excerpt from the book "Linux Device Drivers, 2nd
Edition", By Alessandro Rubini & Jonathan Corbet :
{
The Current Process
Although kernel modules don't execute sequentially as applications do,
most actions performed by the kernel are related to a specific process.
Kernel code can know the current process driving it by accessing the
global item current, a pointer to struct task_struct, which as of version
2.4 of the kernel is declared in <asm/current.h>, included by
<linux/sched.h>. The current pointer refers to the user process currently
executing. During the execution of a system call, such as open or read,
the current process is the one that invoked the call. Kernel code can use
process-specific information by using current, if it needs to do so. An
example of this technique is presented in "Access Control on a Device
File", in Chapter 5, "Enhanced Char Driver Operations".
}
By the way, this book is great and most of all FREE!
I think you 'd get more answers in matters like these in lower lever
mailing-lists, although I have none to propose...
Regards,
> hi
> i am trying to modify the recv() and send() system calls in red hat linux
> kernel version 2.4.26. i am unable to find the code for the specified
> function in the kernel source code. can anyone please help me out in this
> matter.
>
> also i am having the following problems
>
> i am writing a kernel module for modifying read() and write() system
> calls
> how do i know the process id of the calling process from this module?
>
> Hoping that someone can help me.
>
> warm regards,
> sundeep
>
>
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