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                ### 系統調用 我們要想啟動一個進程,需要操作系統的調用(system call)。實際上操作系統和普通進程是運行在不同空間上的,操作系統進程運行在內核態(todo: kernel space),開發者運行得進程運行在用戶態(todo: user space),這樣有效規避了用戶程序破壞系統的可能。 如果用戶態進程想執行內核態的操作,只能通過系統調用了。Linux提供了超多系統調用函數,我們關注與進程相關的系統調用后面也會詳細講解。
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