The Linux kernel keeps complete information about a process in a process descriptor defined as struct task_struct.

Linux内核将关于进程的完整信息保存在进程描述符中，它的结构被定义为struct task_struct。

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Table 3-4 lists the fields of the process descriptor that establish these relationships between a process P and the other processes.

下表列出了在P进程和其他进程之间建立这些关系的成员。

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The file descriptor is merely an identifier for the process.

文件描述符只不过是进程的标识符。

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