On Sun, Sep 1, 2013 at 3:16 PM, Greg Freemyer <greg.freemyer@gmail.com> wrote:
Kevin Wilson <wkevils@gmail.com> wrote:
Hi, Can someone please explain why are netlink sockets a better communication method between kernel space and userspace ?
Another reason is to make things easier to extend. Adding a parameter to a netlink message is as easy as adding an additional netlink attribute. User space applications that has not been updated to support your change, will not see this parameter as it is unknown to them when processing the attributes. Extending an ioctl would mean adding new paramteres to the struct that is passed to/from the kernel, which will cause all kinds of problems. For example, how to avoid overflows when returning it to user space. -Kristian