hi everybody, i am writting a character device driver. i am pritting some debugging messages using printk in kernel. now the problem is after switching from kernel space to user space when any system call (read/write ) is done, i am unable to print any messages using printf calls. but if write is working fine with fd =1, thanks, anil note: please cc the answer - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/