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ioctl (General description)
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`ioctl' performs low level calls to communicate with device drivers. As
there are lots of different device drivers, no really general
description is possible.

The DJGPP version tries to cope two different flavors of `ioctl', a
DOSish and a UNIXish way. To distinguish between DOS-like and UNIX-like
calls, all valid DOS commands have the 3 MSB set to 0, the UNIX command
have at least one of the 3 MSB set.