Hi,
I am writing a kernel thread which opens a file and
writes into it everytime in a continous loop. The
Kernel thread is started by a system call.
The problem is the file openning by Kernel thread
fails and sys_open() returns -14 (EFAULT). Can any
body help me in this ??? Also if you know any url
where there is good discussion or documentation of
kernel threads, keventd , let me know.
source is as follows:
static void example_thread()
{
int i,error,fd,num;
char c;
daemonize();
strcpy(current->comm,"examplethread");
printk("This is test log message by
example_thread\n");
for(;;)
{
fd=sys_open("/tmp/examplethread",O_CREAT |
O_WRONLY,S_IRWXU);
printk("Fd of the file:%d\n",fd);
if (fd>=0)
{
num=sys_write(fd,"This is test log",100);
}
else
{
printk("/tmp/examplethread failed to open\n");
goto out;
}
sys_close(fd);
current->state = TASK_INTERRUPTIBLE;
schedule();
}
printk("The second message is read from log
buffer\n");
out:
printk("example_thread exiting\n");
}
asmlinkage int sys_startkthread( )
{
pid_t pid;
pid = kernel_thread(example_thread,NULL,CLONE_FS |
CLONE_FILES | CLONE_SIGNAL);
if (pid < 0)
return -1;
return pid;
}
thanks in advance,
KR
=====
"Conquering Myselves to Conquer The World"
"Securing Kernel to Secure Whole System"
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