# frozen_string_literal: true module BSD::Capsicum module FFI require "fiddle" include Fiddle::Types include Constants module_function ## # Provides a Ruby interface for cap_enter(2) # @return [Integer] def cap_enter Fiddle::Function.new( libc["cap_enter"], [], 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"], [INTPTR_T], INT ).call(uintp) end ## # Provides a Ruby interface for cap_rights_limit(2) # @param [Integer] fd # @param [Fiddle::Pointer] rights # @return [Integer] def cap_rights_limit(fd, rights) Fiddle::Function.new( libc["cap_rights_limit"], [INT, VOIDP], INT ).call(fd, rights) end ## # Provides a Ruby interface for cap_rights_init(2) # @see BSD::Capsicum::Constants See Constants for a full list of capabilities # @param [Array] rights # Allowed capabilities # @return [Fiddle::Pointer] # Returns a pointer to the structure `cap_rights_t` def cap_rights_init(*rights) voidp = Fiddle::Pointer.malloc(Fiddle::SIZEOF_VOIDP) varargs = rights.flat_map { [ULONG_LONG, (Symbol === _1) ? Constants.const_get(_1) : _1] } Fiddle::Function.new( libc["__cap_rights_init"], [INT, VOIDP, VARIADIC], VOIDP ).call(CAP_RIGHTS_VERSION, voidp, *varargs) voidp end ## # @api private def libc @libc ||= Fiddle.dlopen Dir["/lib/libc.*"].first end end private_constant :FFI end