--- fork
--- fork { ... }

    fork(2) [manual page] ƥॳȤäƥץʣ
    ޤƥץǤϻҥץΥץID򡢻ҥץǤ
    nil ֤ޤ֥åꤷƸƤӽФˤϡ
    ҥץǥ֥åɾޤ

