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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>isatty</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_038"> </a>NAME</h4><blockquote>isatty - test for a terminal device</blockquote><h4><a name = "tag_000_007_039"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="unistd.h.html">unistd.h</a>>int isatty(int <i>fildes</i>);</code></pre></blockquote><h4><a name = "tag_000_007_040"> </a>DESCRIPTION</h4><blockquote>The<i>isatty()</i>function tests whether<i>fildes</i>,an open file descriptor, is associated with a terminal device.</blockquote><h4><a name = "tag_000_007_041"> </a>RETURN VALUE</h4><blockquote>The<i>isatty()</i>function returns 1 if<i>fildes</i>is associated with a terminal; otherwise it returns 0and may set<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_042"> </a>ERRORS</h4><blockquote>The<i>isatty()</i>function may fail if:<dl compact><dt>[EBADF]<dd>The<i>fildes</i>argument is not a valid open file descriptor.<dt>[ENOTTY]<dd>The<i>fildes</i>argument is not associated with a terminal.</dl></blockquote><h4><a name = "tag_000_007_043"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_044"> </a>APPLICATION USAGE</h4><blockquote>The<i>isatty()</i>function does not necessarily indicate that a human being is available forinteraction via<i>fildes</i>.It is quite possible that non-terminal devices are connected tothe communications line.</blockquote><h4><a name = "tag_000_007_045"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_046"> </a>SEE ALSO</h4><blockquote><i><a href="unistd.h.html"><unistd.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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