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34. Process Groups, Sessions, and Job Co... > Foreground and Background Process Gr...

Foreground and Background Process Groups

The controlling terminal maintains the notion of a foreground process group. Within a session, only one process group can be in the foreground at a particular moment; all of the other process groups in the session are background process groups. The foreground process group is the only process group that can freely read and write on the controlling terminal. When one of the signal-generating terminal characters is typed on the controlling terminal, the terminal driver delivers the corresponding signal to the members of the foreground process group. We describe further details in Section 34.7.


  

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