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106 lines
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<html lang="en">
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<head>
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<title>Input/Output - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Running.html#Running" title="Running">
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<link rel="prev" href="Working-Directory.html#Working-Directory" title="Working Directory">
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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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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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<body>
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<div class="node">
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<a name="Input%2fOutput"></a>
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<a name="Input_002fOutput"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Attach.html#Attach">Attach</a>,
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Previous: <a rel="previous" accesskey="p" href="Working-Directory.html#Working-Directory">Working Directory</a>,
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Up: <a rel="up" accesskey="u" href="Running.html#Running">Running</a>
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<hr>
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</div>
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<h3 class="section">4.6 Your Program's Input and Output</h3>
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<p><a name="index-redirection-143"></a><a name="index-i_002fo-144"></a><a name="index-terminal-145"></a>By default, the program you run under <span class="sc">gdb</span> does input and output to
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the same terminal that <span class="sc">gdb</span> uses. <span class="sc">gdb</span> 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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<a name="index-info-terminal-146"></a>
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<dl><dt><code>info terminal</code><dd>Displays information recorded by <span class="sc">gdb</span> about the terminal modes your
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program is using.
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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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<pre class="smallexample"> run > outfile
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</pre>
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<p class="noindent">starts your program, diverting its output to the file <samp><span class="file">outfile</span></samp>.
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<p><a name="index-tty-147"></a><a name="index-controlling-terminal-148"></a>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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<pre class="smallexample"> tty /dev/ttyb
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</pre>
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<p class="noindent">directs that processes started with subsequent <code>run</code> commands
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default to do input and output on the terminal <samp><span class="file">/dev/ttyb</span></samp> and have
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that as their controlling terminal.
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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>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 <span class="sc">gdb</span> 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><a name="index-inferior-tty-149"></a><a name="index-set-inferior-controlling-terminal-150"></a>You can use the <code>show inferior-tty</code> command to tell <span class="sc">gdb</span> 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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<dl>
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<dt><code>set inferior-tty [ </code><var>tty</var><code> ]</code><dd><a name="index-set-inferior_002dtty-151"></a>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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<span class="sc">gdb</span>.
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<br><dt><code>show inferior-tty</code><dd><a name="index-show-inferior_002dtty-152"></a>Show the current tty for the program being debugged.
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</dl>
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</body></html>
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