Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In POSIX-conformant operating systems, a process group denotes a collection of one or more processes. Process groups are used to control the distribution of signals. A signal directed to a process group is delivered individually to all of the processes that are members of the group. Process groups are themselves grouped into sessions. Process groups are not permitted to migrate from one session to another, and a process may only create new process groups belonging to the same session as it itself belongs to. Processes are not permitted to join process groups that are not in the same session as they themselves are. New process images created by a call to a function of the exec family inherit the process group membership and the session membership of the old process image.

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