0 is not a valid ioctl code. A valid ioctl code has to have at least one of IOC_VOID, IOC_IN, or IOC_OUT set. Also, if it has either IOC_IN or IOC_OUT set, it must have a non-zero size field. You should use one of the _IO* macros from <sys/iocomm.h> to define a valid ioctl code and pass that to your driver. -- John Baldwin _______________________________________________ freebsd-drivers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-drivers To ...