... kernels, 50 2 51 4functions, 54 2 54 5interrupt handlers for, 52 3ioctl commands, 53 5link state (changes in), 52 8MAC addresses (resolutionof), 53 2 53 4multicasting, 53 7 54 0opening, 51 5 51 6snull, ... 94–96open files, 53 open function (tty drivers) , 55 3 55 6open method, 51 , 58 59 block drivers, 471blocking, 176for network devices, 51 1private_data and, 54 requesting DMA channels, 455 restricting ... 237, 238, 255 block drivers, 468DMA (see DMA)global areas, 43hardware, 50 6high, 4 15 I/O, 2 35 254 , 255 ISAaccess, 253 memory range, 252 – 254 limitations on, 4 15 locking, 109low, 4 15 management,...