not sure how u wrote your module.....want to post your code here?
>From kernel/timer.c:
373 void __timer_stats_timer_set_start_info(struct timer_list *timer,
void *addr)
374 {
375 if (timer->start_site)
376 return;
377
378 timer->start_site = addr;
379 memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
380 timer->start_pid = current->pid;
381 }
the answer is obvious......i suspect u got your global variable
"current" wrongly.
look into:
./arch/x86/kernel/cpu/common.c:
EXPORT_PER_CPU_SYMBOL(current_task);
u can see that "current_task" is per-CPU and is exported, ie,
different CPU may be executing different task.
so, from ./Documentation/uml/UserModeLinux-HOWTO.txt:
(gdb) p current_task.pid
(gdb) p current_task.prev_task.comm
(gdb) p current_task.prev_task.thread
Or inside your kernel module....just do current_task->comm will do, as
the symbol is exported.
But I cannot find EXPORT declaration for "current", so your kernel
module cannot access the global variable directly - roundabout way
needed.
But if you compile your codes + kernel together, NOT USING KERNEL
MODULE, then access any global variable (eg, current) is possible.
On Mar 22, 10:42 am, perumal316 <[email protected]> wrote:
> Hi,
>
> Is there any way to get the current process ID and the corresponding
> name of the application from the kernel module?
>
> I have tried using task->comm ,task->pid, current->pid etc But I am
> not getting the correct process ID.
>
> I want to printk the process ID and the application name each time a
> system call is called. System call should have a way to identify which
> process ID or application is calling it.
>
> Any other way to printk the process ID and the application name?
>
> Thanks In Advance,
> Perumal
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