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| <title>Debugging with GDB: isatty</title> |
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| <a name="isatty-1"></a> |
| <h4 class="unnumberedsubsubsec">isatty</h4> |
| <a name="index-isatty_002c-file_002di_002fo-system-call"></a> |
| |
| <dl compact="compact"> |
| <dt>Synopsis:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">int isatty(int fd); |
| </pre></div> |
| |
| </dd> |
| <dt>Request:</dt> |
| <dd><p>‘<samp>Fisatty,<var>fd</var></samp>’ |
| </p> |
| </dd> |
| <dt>Return value:</dt> |
| <dd><p>Returns 1 if <var>fd</var> refers to the <small>GDB</small> console, 0 otherwise. |
| </p> |
| </dd> |
| <dt>Errors:</dt> |
| <dd> |
| <dl compact="compact"> |
| <dt><code>EINTR</code></dt> |
| <dd><p>The call was interrupted by the user. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| </dl> |
| |
| <p>Note that the <code>isatty</code> call is treated as a special case: it returns |
| 1 to the target if the file descriptor is attached |
| to the <small>GDB</small> console, 0 otherwise. Implementing through system calls |
| would require implementing <code>ioctl</code> and would be more complex than |
| needed. |
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