81 lines
3.8 KiB
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81 lines
3.8 KiB
HTML
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<title>Console I/O - Debugging with GDB</title>
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<a name="Console-I%2fO"></a>
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<a name="Console-I_002fO"></a>
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Next: <a rel="next" accesskey="n" href="List-of-Supported-Calls.html#List-of-Supported-Calls">List of Supported Calls</a>,
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Previous: <a rel="previous" accesskey="p" href="The-Ctrl_002dC-Message.html#The-Ctrl_002dC-Message">The Ctrl-C Message</a>,
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Up: <a rel="up" accesskey="u" href="File_002dI_002fO-Remote-Protocol-Extension.html#File_002dI_002fO-Remote-Protocol-Extension">File-I/O Remote Protocol Extension</a>
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<hr>
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</div>
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<h4 class="subsection">E.13.6 Console I/O</h4>
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<p><a name="index-console-i_002fo-as-part-of-file_002di_002fo-3602"></a>
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By default and if not explicitly closed by the target system, the file
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descriptors 0, 1 and 2 are connected to the <span class="sc">gdb</span> console. Output
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on the <span class="sc">gdb</span> console is handled as any other file output operation
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(<code>write(1, ...)</code> or <code>write(2, ...)</code>). Console input is handled
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by <span class="sc">gdb</span> so that after the target read request from file descriptor
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0 all following typing is buffered until either one of the following
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conditions is met:
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<ul>
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<li>The user types <kbd>Ctrl-c</kbd>. The behaviour is as explained above, and the
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<code>read</code>
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system call is treated as finished.
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<li>The user presses <RET>. This is treated as end of input with a trailing
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newline.
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<li>The user types <kbd>Ctrl-d</kbd>. This is treated as end of input. No trailing
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character (neither newline nor ‘<samp><span class="samp">Ctrl-D</span></samp>’) is appended to the input.
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</ul>
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<p>If the user has typed more characters than fit in the buffer given to
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the <code>read</code> call, the trailing characters are buffered in <span class="sc">gdb</span> until
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either another <code>read(0, ...)</code> is requested by the target, or debugging
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is stopped at the user's request.
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</body></html>
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