| <html lang="en"> |
| <head> |
| <title>Continuing Stopped Jobs - 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="Implementing-a-Shell.html#Implementing-a-Shell" title="Implementing a Shell"> |
| <link rel="prev" href="Stopped-and-Terminated-Jobs.html#Stopped-and-Terminated-Jobs" title="Stopped and Terminated Jobs"> |
| <link rel="next" href="Missing-Pieces.html#Missing-Pieces" title="Missing Pieces"> |
| <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="Continuing-Stopped-Jobs"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Missing-Pieces.html#Missing-Pieces">Missing Pieces</a>, |
| Previous: <a rel="previous" accesskey="p" href="Stopped-and-Terminated-Jobs.html#Stopped-and-Terminated-Jobs">Stopped and Terminated Jobs</a>, |
| Up: <a rel="up" accesskey="u" href="Implementing-a-Shell.html#Implementing-a-Shell">Implementing a Shell</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">27.6.6 Continuing Stopped Jobs</h4> |
| |
| <p><a name="index-stopped-jobs_002c-continuing-3225"></a>The shell can continue a stopped job by sending a <code>SIGCONT</code> signal |
| to its process group. If the job is being continued in the foreground, |
| the shell should first invoke <code>tcsetpgrp</code> to give the job access to |
| the terminal, and restore the saved terminal settings. After continuing |
| a job in the foreground, the shell should wait for the job to stop or |
| complete, as if the job had just been launched in the foreground. |
| |
| <p>The sample shell program handles both newly created and continued jobs |
| with the same pair of functions, <code>put_job_in_foreground</code><!-- /@w --> and |
| <code>put_job_in_background</code><!-- /@w -->. The definitions of these functions |
| were given in <a href="Foreground-and-Background.html#Foreground-and-Background">Foreground and Background</a>. When continuing a |
| stopped job, a nonzero value is passed as the <var>cont</var> argument to |
| ensure that the <code>SIGCONT</code> signal is sent and the terminal modes |
| reset, as appropriate. |
| |
| <p>This leaves only a function for updating the shell's internal bookkeeping |
| about the job being continued: |
| |
| <pre class="smallexample"> /* <span class="roman">Mark a stopped job J as being running again.</span> */ |
| |
| void |
| mark_job_as_running (job *j) |
| { |
| Process *p; |
| |
| for (p = j->first_process; p; p = p->next) |
| p->stopped = 0; |
| j->notified = 0; |
| } |
| |
| /* <span class="roman">Continue the job J.</span> */ |
| |
| void |
| continue_job (job *j, int foreground) |
| { |
| mark_job_as_running (j); |
| if (foreground) |
| put_job_in_foreground (j, 1); |
| else |
| put_job_in_background (j, 1); |
| } |
| </pre> |
| </body></html> |
| |
