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.
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- 每個(gè)進(jìn)程描述符都有一個(gè)成員描述其所屬的進(jìn)程組，每個(gè)進(jìn)程組能有一個(gè)進(jìn)程組頭進(jìn)程，他的PID和這個(gè)進(jìn)程組的ID相同。
