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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>cfsetispeed</title></head><body bgcolor="white"><basefont size="3"> <a name="cfsetispeed"></a> <a name="tag_03_67"></a><!-- cfsetispeed --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_67_01"></a>NAME</h4><blockquote>cfsetispeed - set input baud rate</blockquote><h4><a name="tag_03_67_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/termios.h.html">termios.h</a>><br><br> int cfsetispeed(struct termios *</tt><i>termios_p</i><tt>, speed_t</tt> <i>speed</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_67_03"></a>DESCRIPTION</h4><blockquote><p>The <i>cfsetispeed</i>() function shall set the input baud rate stored in the structure pointed to by <i>termios_p</i> to<i>speed.</i></p><p>There shall be no effect on the baud rates set in the hardware until a subsequent successful call to <a href="../functions/tcsetattr.html"><i>tcsetattr</i>()</a> with the same <b>termios</b> structure. Similarly, errors resulting fromattempts to set baud rates not supported by the terminal device need not be detected until the <a href="../functions/tcsetattr.html"><i>tcsetattr</i>()</a> function is called.</p></blockquote><h4><a name="tag_03_67_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>cfsetispeed</i>() shall return 0; otherwise, -1 shall be returned, and <i>errno</i> may be set toindicate the error.</p></blockquote><h4><a name="tag_03_67_05"></a>ERRORS</h4><blockquote><p>The <i>cfsetispeed</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The <i>speed</i> value is not a valid baud rate.</dd><dt>[EINVAL]</dt><dd>The value of <i>speed</i> is outside the range of possible speed values as specified in <a href="../basedefs/termios.h.html"><i><termios.h></i></a>.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_67_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_67_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_67_08"></a>RATIONALE</h4><blockquote><p>Refer to <a href="cfgetispeed.html"><i>cfgetispeed</i>()</a>.</p></blockquote><h4><a name="tag_03_67_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_67_10"></a>SEE ALSO</h4><blockquote><p><a href="cfgetispeed.html"><i>cfgetispeed</i>()</a>, <a href="cfgetospeed.html"><i>cfgetospeed</i>()</a>, <a href="cfsetospeed.html"><i>cfsetospeed</i>()</a>, <a href="tcsetattr.html"><i>tcsetattr</i>()</a>, the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap11.html#tag_11">Chapter 11, General Terminal Interface</a>, <a href="../basedefs/termios.h.html"><i><termios.h></i></a></p></blockquote><h4><a name="tag_03_67_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p></blockquote><h4><a name="tag_03_67_12"></a>Issue 6</h4><blockquote><p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p><ul><li><p>The optional setting of <i>errno</i> and the [EINVAL] error conditions are added.</p></li></ul></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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