| <html lang="en"> |
| <head> |
| <title>Controlling Terminal - The GNU C Library</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="The GNU C Library"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Job-Control.html#Job-Control" title="Job Control"> |
| <link rel="prev" href="Job-Control-is-Optional.html#Job-Control-is-Optional" title="Job Control is Optional"> |
| <link rel="next" href="Access-to-the-Terminal.html#Access-to-the-Terminal" title="Access to the Terminal"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU C library. |
| |
| This is Edition 0.12, last updated 2007-10-27, |
| of `The GNU C Library Reference Manual', for version |
| 2.8 (Sourcery G++ Lite 2011.03-41). |
| |
| Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, |
| 2003, 2007, 2008, 2010 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software Needs Free Documentation'' |
| and ``GNU Lesser General Public License'', the Front-Cover texts being |
| ``A GNU Manual'', and with the Back-Cover Texts as in (a) below. A |
| copy of the license is included in the section entitled "GNU Free |
| Documentation License". |
| |
| (a) The FSF's Back-Cover Text is: ``You have the freedom to |
| copy and modify this GNU manual. Buying copies from the FSF |
| supports it in developing GNU and promoting software freedom.''--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Controlling-Terminal"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Access-to-the-Terminal.html#Access-to-the-Terminal">Access to the Terminal</a>, |
| Previous: <a rel="previous" accesskey="p" href="Job-Control-is-Optional.html#Job-Control-is-Optional">Job Control is Optional</a>, |
| Up: <a rel="up" accesskey="u" href="Job-Control.html#Job-Control">Job Control</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">27.3 Controlling Terminal of a Process</h3> |
| |
| <p>One of the attributes of a process is its controlling terminal. Child |
| processes created with <code>fork</code> inherit the controlling terminal from |
| their parent process. In this way, all the processes in a session |
| inherit the controlling terminal from the session leader. A session |
| leader that has control of a terminal is called the <dfn>controlling |
| process</dfn> of that terminal. |
| |
| <p><a name="index-controlling-process-3208"></a>You generally do not need to worry about the exact mechanism used to |
| allocate a controlling terminal to a session, since it is done for you |
| by the system when you log in. |
| <!-- ??? How does GNU system let a process get a ctl terminal. --> |
| |
| <p>An individual process disconnects from its controlling terminal when it |
| calls <code>setsid</code> to become the leader of a new session. |
| See <a href="Process-Group-Functions.html#Process-Group-Functions">Process Group Functions</a>. |
| |
| <!-- !!! explain how it gets a new one (by opening any terminal) --> |
| <!-- ??? How you get a controlling terminal is system-dependent. --> |
| <!-- We should document how this will work in the GNU system when it is decided. --> |
| <!-- What Unix does is not clean and I don't think GNU should use that. --> |
| </body></html> |
| |
