GetIoctlNumber.swift

import Foundation

/// Returns a ioctl number from a specified group and number
func getIoctlNumber(group: Character, number n:UInt) -> UInt {
    let void = UInt(IOC_VOID)
    let g: UInt = UInt(group.asciiValue!) << 8
    
    return void | g | n
}

// Example:
// DKIOCEJECT (atleast for Darwin platforms) is the 21th of group d
// let DKIOCEJECT = getIoctlNumber(group: "d", number: 21)
// print("DKIOEject Ioctl Code: \(DKIOCEJECT)")