On Mon, 1 Apr 2002, Dan Erickson wrote: > I asked the person I was talking to on #kernelnewbies what sends the > command? ie) the unsigned int cmd in ioctl. > And he said a userspace program sends the command. Is this true? > What I mean, is that something needs to say "I want to keep the computer > alive". So I will call WDIOC_KEEPALIVE to do this for me. And it was > highly confussing me as to what actualy sends the WDIOC_KEEPALIVE to the > driver. Open the watchdog character device (e.g. /dev/watchdog) and then pass the file descriptor to ioctl(2), you can then manipulate the device using ioctl with the requested ioctl (e.g. WDIOC_KEEPALIVE) as the second paramter. So yes it is a userland program which you'd use. Try writing a watchdog program/daemon and you'll understand how it works. Cheers, Zwane -- http://function.linuxpower.ca -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
