For process groups in data replication, see Virtual synchrony.
In a POSIX-conformant operating system, a process group denotes a collection of one or more processes.[1]
Among other things, a process group is used to control the distribution of a signal;
when a signal is directed to a process group, the signal is delivered to each process that is a member of the group.[2]
Similarly, a session denotes a collection of one or more process groups.[3]
A process may not create a process group that belongs to another session;
furthermore, a process is not permitted to join a process group that is a member of another session—that is, a process is not permitted to migrate from one session to another.
When a process replaces its image with a new image (by calling one of the exec functions), the new image is subjected to the same process group (and thus session) membership as the old image.
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