info2.cr

module Sys::Info
  VERSION = "0.1.0"

  lib LibC
    struct Uname
      sysname : ::LibC::Char[256]
      nodename : ::LibC::Char[256]
      release : ::LibC::Char[256]
      version : ::LibC::Char[256]
      machine : ::LibC::Char[256]
    end

    fun uname(value : Uname*) : Int32
  end

  struct Uname
    getter cstruct

    def initialize(@cstruct : LibC::Uname)
    end

    macro get(prop)
      def {{prop}}
        String.new(cstruct.{{prop}}.to_unsafe)
      end
    end

    get sysname
    get nodename
    get release
    get version
    get machine
  end

  def self.uname
    uname_struct = LibC::Uname.new

    if LibC.uname(pointerof(uname_struct)) < 0
      raise "uname function call failed"
    else
      Uname.new(uname_struct)
    end
  end
end

uname = Sys::Info.uname
puts uname.sysname
puts uname.nodename
puts uname.release
puts uname.version
puts uname.machine