hai , Can anyone list what are the ways available to send signal or indication to kernel space asychronously to user space. I had to send around 5 or 6 indication to user asynchronously .Using kill_fasync,it is possible to send only SIGIO signal which will solve only one indication.In this case what shall I do?? If 3 or 4 process running in user space,how to send to specific process ie., If iam sending a signal to user space having two or more process running,which process will receive that signal?? Rgds H.Ayyappan ____________________________________________________ Send a rakhi to your brother, buy gifts and win attractive prizes. Log on to http://in.promos.yahoo.com/rakhi/index.html -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/