ioctl (command)values not clear

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Hi everyone,

Am in the process of implementing ioctls for a tty-driver. Any idea as to what values are used [when the driver routine is invoked] for the "command" argument in an ioctl call to get/set baud-rate, flow-control. Am unable to get the exact constant [among those defined in asm-i386/ioctl.h] corresponding to baud-rate/flow-control. Also how to manipulate the "arg" of ioctl to update the retrieved value of baud-rate [for example]. 

Rgds,
Sriram NS.
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