LinuxQuestions.org - Signal from driver: zeroes in siginfo

Hi!

I'm using angstrom linux 2.6.25.5-1.1-pae.

I'm sending some signal from my driver to my user application by calling send_sig_info:

Code:

siginfo_t usig;



usig.si_signo = -SIGUSR2;

usig.si_code = SI_QUEUE;

usig.si_errno = any_integer_variable;

usig.si_value.sival_int = any_other_integer_variable;



send_sig_info(SIGUSR2,&usig,task_ptr);

and in user application:

Code:



static struct sigaction siga;



void mysig_handler(int i, siginfo_t* info, void* f) {

    //code that just checks what I've got in info

}



int main(void) {

//some code before



siga.sa_flags = SA_SIGINFO;

siga.sa_sigaction = mysig_handler;



sigaction(SIGUSR2,&siga,NULL);



//other code after

}

As result, my application receives that signal from driver, but siginfo_t in handler was filled by zeroes! I've tried another si_code in driver (SI_ASYNCIO, SI_USER) - but info remains zero-filled.
Then I had some investigation iside signal.c and I'm sure now that my siginfo_t remains correct in __send_signal function, after copying to new struct sigqueue *q... but then i was lost in kernel code.

Please don't ask me why I need to send signal from driver in kernelspace to application in userspace :)

I'm just wondering what happens with siginfo_t ? What code should I write to get it correct? I guess problem is located in driver (sending) code, because application can successfully send signal to itself with correct si_value.sival_int.

Thanks in advance!