environ using dlsym

environ.swift

import Darwin
import Foundation

let environ: UnsafePointer<UnsafePointer<CChar>> = UnsafePointer(dlsym(UnsafeMutablePointer(bitPattern: Int(-2)), "environ"))[0]


var iterator = environ
while iterator.memory != nil {
    print(String.fromCString(iterator.memory))
    iterator = iterator.successor()
}