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| <!-- %MENU% All about process groups and sessions --> |
| <h2 class="chapter">27 Job Control</h2> |
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| <p><a name="index-process-groups-3196"></a><a name="index-job-control-3197"></a><a name="index-job-3198"></a><a name="index-session-3199"></a><dfn>Job control</dfn> refers to the protocol for allowing a user to move |
| between multiple <dfn>process groups</dfn> (or <dfn>jobs</dfn>) within a single |
| <dfn>login session</dfn>. 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. |
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| <p>You need to be familiar with concepts relating to process creation |
| (see <a href="Process-Creation-Concepts.html#Process-Creation-Concepts">Process Creation Concepts</a>) and signal handling (see <a href="Signal-Handling.html#Signal-Handling">Signal Handling</a>) in order to understand this material presented in this |
| chapter. |
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| <ul class="menu"> |
| <li><a accesskey="1" href="Concepts-of-Job-Control.html#Concepts-of-Job-Control">Concepts of Job Control</a>: Jobs can be controlled by a shell. |
| <li><a accesskey="2" href="Job-Control-is-Optional.html#Job-Control-is-Optional">Job Control is Optional</a>: Not all POSIX systems support job control. |
| <li><a accesskey="3" href="Controlling-Terminal.html#Controlling-Terminal">Controlling Terminal</a>: How a process gets its controlling terminal. |
| <li><a accesskey="4" href="Access-to-the-Terminal.html#Access-to-the-Terminal">Access to the Terminal</a>: How processes share the controlling terminal. |
| <li><a accesskey="5" href="Orphaned-Process-Groups.html#Orphaned-Process-Groups">Orphaned Process Groups</a>: Jobs left after the user logs out. |
| <li><a accesskey="6" href="Implementing-a-Shell.html#Implementing-a-Shell">Implementing a Shell</a>: What a shell must do to implement job control. |
| <li><a accesskey="7" href="Functions-for-Job-Control.html#Functions-for-Job-Control">Functions for Job Control</a>: Functions to control process groups. |
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