ioctl (General description)

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.

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