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(libc.info)Job Control

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Job Control
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   "Job control" refers to the protocol for allowing a user to move
between multiple "process groups" (or "jobs") within a single "login
session".  The job control facilities are set up so that appropriate
behavior for most programs happens automatically and they need not do
anything special about job control.  So you can probably ignore the
material in this chapter unless you are writing a shell or login
program.

   You need to be familiar with concepts relating to process creation
(Note: Process Creation Concepts) and signal handling (Note: Signal
Handling) in order to understand this material presented in this
chapter.

Concepts of Job Control

Jobs can be controlled by a shell.

Job Control is Optional

Not all POSIX systems support job control.

Controlling Terminal

How a process gets its controlling terminal.

Access to the Terminal

How processes share the controlling terminal.

Orphaned Process Groups

Jobs left after the user logs out.

Implementing a Shell

What a shell must do to implement job control.

Functions for Job Control

Functions to control process groups.