Each process descriptor includes a field containing the process group ID .Each group of processes may have a group leader, which is the process whose PID coincides with the process group ID.

 
  • 每个进程描述符都有一个成员描述其所属的进程组,每个进程组能有一个进程组头进程,他的PID和这个进程组的ID相同。
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