sosend() and mbuf

[Maslan]

No my code doesn't work, I thought it may be because that soaccept()
-which is not found in man 9- is non-blocking, so i've to put my code
in a thread.
Now i got another problem, when I open a text file from this thread,
the kernel crashes, I'm sure that its the thread.

kthread_create((void *)thread_main, NULL, NULL, RFNOWAIT, 0, "thread");

void thread_main(){
	struct thread *td = curthread;
	int ret;
	int fd;
	ret = f_open("/path/to/file.txt", &fd);
	printf("%d\n", ret);
	tsleep(td, PDROP, "test tsleep", 10*hz);
        f_close(fd);
	kthread_exit(0);
}

int f_open(char *filename, int *fd){
	struct thread *td = curthread;
	int ret = kern_open(td, filename, UIO_SYSSPACE, O_RDONLY, FREAD);
	if(!ret){
		*fd = td->td_retval[0];
		return 1;
	}
	return 0;
}

I've to finish up this problem to go back for the first one.
Can you figure out what's wrong with this code, it works when I call
thread_main() rather than kthread_create((void *)thread_main, .....

Thanks a lot

2009/8/3 Dag-Erling Smørgrav <des at des.no>:
> [please cc: the list]
>
> Maslan <maslanbsd at gmail.com> writes:
>> man 9 sosend:
>>      Data may be sent directly from kernel or user memory via the uio
>>      argument, or as an mbuf chain via top, avoid- ing a data copy.
>>      Only one of the uio or top pointers may be non-NULL
>
> Hmm, I missed that part.  It never occurred to me to *not* use mbufs.
>
> I guess the question is: what is your question?  Does your code work?
> If it doesn't, where and how does it fail?  If it does, why are you
> asking?
>
> In any case, 'man 9 sosend' answers the "I can't find useful information
> on sosend()" part of your email.  If you still have questions after
> reading that, try looking at existing kernel code that uses sosend(9)
> with iovecs (or with mbufs, if you decide to go that route).
>
> DES
> --
> Dag-Erling Smørgrav - des at des.no
>