mingw/info/gdb/Input-Output.html

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  19 <h3 class="section">Your program's input and output</h3>
  20
  21    <p>By default, the program you run under GDB does input and output to
  22 the same terminal that GDB uses.  GDB switches the terminal
  23 to its own terminal modes to interact with you, but it records the terminal
  24 modes your program was using and switches back to them when you continue
  25 running your program.
  26
  27      <dl>
  28 <dt><code>info terminal</code>
  29      <dd>Displays information recorded by GDB about the terminal modes your
  30 program is using.
  31 </dl>
  32
  33    <p>You can redirect your program's input and/or output using shell
  34 redirection with the <code>run</code> command.  For example,
  35
  36 <pre class="example">     run &gt; outfile
  37      </pre>
  38
  39 <p>starts your program, diverting its output to the file <code>outfile</code>.
  40
  41    <p>Another way to specify where your program should do input and output is
  42 with the <code>tty</code> command.  This command accepts a file name as
  43 argument, and causes this file to be the default for future <code>run</code>
  44 commands.  It also resets the controlling terminal for the child
  45 process, for future <code>run</code> commands.  For example,
  46
  47 <pre class="example">     tty /dev/ttyb
  48      </pre>
  49
  50 <p>directs that processes started with subsequent <code>run</code> commands
  51 default to do input and output on the terminal <code>/dev/ttyb</code> and have
  52 that as their controlling terminal.
  53
  54    <p>An explicit redirection in <code>run</code> overrides the <code>tty</code> command's
  55 effect on the input/output device, but not its effect on the controlling
  56 terminal.
  57
  58    <p>When you use the <code>tty</code> command or redirect input in the <code>run</code>
  59 command, only the input <em>for your program</em> is affected.  The input
  60 for GDB still comes from your terminal.
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