Hi , AFAIK,Generally ppl use ioctl()'s to communicate b/w user space and driver. There are few calls like copy_from_user and copy_to_user which copy data b/w user space and kernel space. I m not sure how fast they are! Rgds, Anand > -----Original Message----- > From: kernelnewbies-bounce@nl.linux.org > [mailto:kernelnewbies-bounce@nl. > linux.org]On Behalf Of Danilo Reinhardt > Sent: Monday, April 05, 2004 3:08 PM > To: kernelnewbies@nl.linux.org > Subject: Exchange Date Userspace<->Kernel > > > Hi, > > I want to develop a driver that exchanges/modifies data between 2 > devices. Now I try to find out whats the best way to do this. > > I think there are 2 ways to do it, the first by doing all work inside > the driver, and the secondy by passing the data from the driver to an > userspace programm which handles and forwards the data to the second > device. > > Whats the fastest way to exchange data between the kernel and a > userspace process and how fast is it? > > And on the other side, whats the best way to exchange data inside the > kernel between 2 devices (which are handled by the same driver!). > > Thanks for all replies! > > Bye Dan > > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
