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                [TOC] ## 孤兒進程 父進程不在了,子進程還在運行,這時我們就把子進程的PPID設為1。前面講PID提到,操作系統會創建進程號為1的init進程,它沒有父進程也不會退出,可以收養系統的孤兒進程 在現實中用戶可能刻意使進程成為孤兒進程,這樣就可以讓它與父進程會話脫鉤,成為守護進程 ## 僵尸進程 一個進程使用fork創建子進程,如果子進程退出,而父進程并沒有調用wait或waitpid獲取子進程的狀態信息,那么子進程的進程描述符仍然保存在系統中。這種進程稱之為僵死進程
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