1.1 System call（linux）系統函數調用過程/如何查看linux內核版本

System call A system call is a controlled entry point into the kernel, allowing a process to request that the kernel perform some action on the process’s behalf. 系統調用是內核控制的的一個接入點，讓進程請求內核代替它進行一系列行爲的操作。

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