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154 lines
6.5 KiB
HTML
154 lines
6.5 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Input/Output (Debugging with GDB)</title>
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<meta name="description" content="Input/Output (Debugging with GDB)">
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<meta name="keywords" content="Input/Output (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Running.html#Running" rel="up" title="Running">
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<link href="Attach.html#Attach" rel="next" title="Attach">
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<link href="Working-Directory.html#Working-Directory" rel="prev" title="Working Directory">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.format {font-family: inherit}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Input_002fOutput"></a>
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<div class="header">
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<p>
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Next: <a href="Attach.html#Attach" accesskey="n" rel="next">Attach</a>, Previous: <a href="Working-Directory.html#Working-Directory" accesskey="p" rel="prev">Working Directory</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Your-Program_0027s-Input-and-Output"></a>
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<h3 class="section">4.6 Your Program’s Input and Output</h3>
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<a name="index-redirection"></a>
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<a name="index-i_002fo"></a>
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<a name="index-terminal"></a>
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<p>By default, the program you run under <small>GDB</small> does input and output to
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the same terminal that <small>GDB</small> uses. <small>GDB</small> switches the terminal
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to its own terminal modes to interact with you, but it records the terminal
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modes your program was using and switches back to them when you continue
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running your program.
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</p>
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<dl compact="compact">
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<dd><a name="index-info-terminal"></a>
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</dd>
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<dt><code>info terminal</code></dt>
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<dd><p>Displays information recorded by <small>GDB</small> about the terminal modes your
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program is using.
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</p></dd>
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</dl>
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<p>You can redirect your program’s input and/or output using shell
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redirection with the <code>run</code> command. For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample">run > outfile
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</pre></div>
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<p>starts your program, diverting its output to the file <samp>outfile</samp>.
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</p>
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<a name="index-tty"></a>
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<a name="index-controlling-terminal"></a>
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<p>Another way to specify where your program should do input and output is
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with the <code>tty</code> command. This command accepts a file name as
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argument, and causes this file to be the default for future <code>run</code>
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commands. It also resets the controlling terminal for the child
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process, for future <code>run</code> commands. For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample">tty /dev/ttyb
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</pre></div>
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<p>directs that processes started with subsequent <code>run</code> commands
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default to do input and output on the terminal <samp>/dev/ttyb</samp> and have
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that as their controlling terminal.
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</p>
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<p>An explicit redirection in <code>run</code> overrides the <code>tty</code> command’s
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effect on the input/output device, but not its effect on the controlling
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terminal.
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</p>
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<p>When you use the <code>tty</code> command or redirect input in the <code>run</code>
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command, only the input <em>for your program</em> is affected. The input
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for <small>GDB</small> still comes from your terminal. <code>tty</code> is an alias
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for <code>set inferior-tty</code>.
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</p>
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<a name="index-inferior-tty"></a>
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<a name="index-set-inferior-controlling-terminal"></a>
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<p>You can use the <code>show inferior-tty</code> command to tell <small>GDB</small> to
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display the name of the terminal that will be used for future runs of your
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program.
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</p>
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<dl compact="compact">
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<dt><code>set inferior-tty [ <var>tty</var> ]</code></dt>
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<dd><a name="index-set-inferior_002dtty"></a>
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<p>Set the tty for the program being debugged to <var>tty</var>. Omitting <var>tty</var>
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restores the default behavior, which is to use the same terminal as
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<small>GDB</small>.
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</p>
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</dd>
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<dt><code>show inferior-tty</code></dt>
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<dd><a name="index-show-inferior_002dtty"></a>
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<p>Show the current tty for the program being debugged.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Attach.html#Attach" accesskey="n" rel="next">Attach</a>, Previous: <a href="Working-Directory.html#Working-Directory" accesskey="p" rel="prev">Working Directory</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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