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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When a process creates multiple children, these children have sibling relationships. Several fields must be introduced in a process descriptor to represent these relationships;

当一个进程创建了多个孩子，这些孩子有兄弟关系。

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