| <html lang="en"> |
| <head> |
| <title>isatty - Debugging with GDB</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Debugging with GDB"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="List-of-Supported-Calls.html#List-of-Supported-Calls" title="List of Supported Calls"> |
| <link rel="prev" href="gettimeofday.html#gettimeofday" title="gettimeofday"> |
| <link rel="next" href="system.html#system" title="system"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2019 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software'' and ``Free Software Needs |
| Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' |
| and with the Back-Cover Texts as in (a) below. |
| |
| (a) The FSF's Back-Cover Text is: ``You are free to copy and modify |
| this GNU Manual. Buying copies from GNU Press supports the FSF in |
| developing GNU and promoting software freedom.'' |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="isatty"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="system.html#system">system</a>, |
| Previous: <a rel="previous" accesskey="p" href="gettimeofday.html#gettimeofday">gettimeofday</a>, |
| Up: <a rel="up" accesskey="u" href="List-of-Supported-Calls.html#List-of-Supported-Calls">List of Supported Calls</a> |
| <hr> |
| </div> |
| |
| <h5 class="unnumberedsubsubsec">isatty</h5> |
| |
| <p><a name="index-isatty_002c-file_002di_002fo-system-call-3614"></a> |
| <dl> |
| <dt>Synopsis:<dd> |
| <pre class="smallexample"> int isatty(int fd); |
| </pre> |
| <br><dt>Request:<dd>‘<samp><span class="samp">Fisatty,</span><var>fd</var></samp>’ |
| |
| <br><dt>Return value:<dd>Returns 1 if <var>fd</var> refers to the <span class="sc">gdb</span> console, 0 otherwise. |
| |
| <br><dt>Errors:<dd> |
| <dl> |
| <dt><code>EINTR</code><dd>The call was interrupted by the user. |
| </dl> |
| |
| </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 <span class="sc">gdb</span> console, 0 otherwise. Implementing through system calls |
| would require implementing <code>ioctl</code> and would be more complex than |
| needed. |
| |
| </body></html> |
| |
