bsdcapsicum.rb/lib/bsd/capsicum/ffi.rb

# @api private
module BSD::Capsicum
  module FFI
    require "fiddle"
    module_function

    ##
    # Provides a Ruby interface for cap_enter(2)
    # @return [Integer]
    def cap_enter
      Fiddle::Function.new(
        libc["cap_enter"],
        [],
        Fiddle::Types::INT
      ).call
    end

    ##
    # Provides a Ruby interface for cap_getmode(2)
    # @param [Fiddle::Pointer] uintp
    # @return [Integer]
    def cap_getmode(uintp)
      Fiddle::Function.new(
        libc["cap_getmode"],
        [Fiddle::Types::INTPTR_T],
        Fiddle::Types::INT
      ).call(uintp)
    end

    ##
    # @api private
    def libc
      @libc ||= Fiddle.dlopen Dir["/lib/libc.*"].first
    end
  end
end