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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>tcgetattr</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_009_462"> </a>NAME</h4><blockquote>tcgetattr - get the parameters associated with the terminal</blockquote><h4><a name = "tag_000_009_463"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="termios.h.html">termios.h</a>>int tcgetattr(int <i>fildes</i>, struct termios *<i>termios_p</i>);</code></pre></blockquote><h4><a name = "tag_000_009_464"> </a>DESCRIPTION</h4><blockquote>The<i>tcgetattr()</i>function gets the parameters associated with the terminal referred to by<i>fildes</i>and stores them in the<b>termios</b>structure referenced by<i>termios_p</i>.The<i>fildes</i>argument is an open file descriptor associated with a terminal.<p>The<i>termios_p</i>argument is a pointer to a<b>termios</b>structure.<p>The<i>tcgetattr()</i>operation is allowed from any process.<p>If the terminal device supports different input and output baudrates, the baud rates stored in the<b>termios</b>structure returned by<i>tcgetattr()</i>reflect the actual baud rates, even if they are equal. If differingbaud rates are not supported, the rate returned as the output baudrate is the actual baud rate. If the terminal device does not support split baud rates, theinput baud rate stored in the<b>termios</b>structure will be 0.</blockquote><h4><a name = "tag_000_009_465"> </a>RETURN VALUE</h4><blockquote>Upon successful completion, 0 is returned. Otherwise, -1 is returned and<i>errno</i>is set to indicate the error.</blockquote><h4><a name = "tag_000_009_466"> </a>ERRORS</h4><blockquote>The<i>tcgetattr()</i>function will fail if:<dl compact><dt>[EBADF]<dd>The<i>fildes</i>argument is not a valid file descriptor.<dt>[ENOTTY]<dd>The file associated with<i>fildes</i>is not a terminal.</dl></blockquote><h4><a name = "tag_000_009_467"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_468"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_009_469"> </a>FUTURE DIRECTIONS</h4><blockquote>In a future issue of this document, implementations which do not support differingbaud rates will be prohibited from returning 0 as the input baud rate.</blockquote><h4><a name = "tag_000_009_470"> </a>SEE ALSO</h4><blockquote><i><a href="tcsetattr.html">tcsetattr()</a></i>,<i><a href="termios.h.html"><termios.h></a></i>,the <b>XBD</b> specification, <a href="../xbd/termios.html"><b>General Terminal Interface</b> </a>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX.1-1988 standard.</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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