154 lines
4.9 KiB
HTML
154 lines
4.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>tcsendbreak</title>
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<body bgcolor="white">
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<basefont size="3"> <a name="tcsendbreak"></a> <a name="tag_03_767"></a><!-- tcsendbreak -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_767_01"></a>NAME</h4>
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<blockquote>tcsendbreak - send a break for a specific duration</blockquote>
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<h4><a name="tag_03_767_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/termios.h.html">termios.h</a>><br>
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<br>
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int tcsendbreak(int</tt> <i>fildes</i><tt>, int</tt> <i>duration</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_767_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>If the terminal is using asynchronous serial data transmission, <i>tcsendbreak</i>() shall cause transmission of a continuous
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stream of zero-valued bits for a specific duration. If <i>duration</i> is 0, it shall cause transmission of zero-valued bits for at
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least 0.25 seconds, and not more than 0.5 seconds. If <i>duration</i> is not 0, it shall send zero-valued bits for an
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implementation-defined period of time.</p>
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<p>The <i>fildes</i> argument is an open file descriptor associated with a terminal.</p>
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<p>If the terminal is not using asynchronous serial data transmission, it is implementation-defined whether <i>tcsendbreak</i>()
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sends data to generate a break condition or returns without taking any action.</p>
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<p>Attempts to use <i>tcsendbreak</i>() from a process which is a member of a background process group on a <i>fildes</i>
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associated with its controlling terminal shall cause the process group to be sent a SIGTTOU signal. If the calling process is
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blocking or ignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent.</p>
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</blockquote>
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<h4><a name="tag_03_767_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_767_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>tcsendbreak</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EBADF]</dt>
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<dd>The <i>fildes</i> argument is not a valid file descriptor.</dd>
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<dt>[ENOTTY]</dt>
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<dd>The file associated with <i>fildes</i> is not a terminal.</dd>
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</dl>
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<p>The <i>tcsendbreak</i>() function may fail if:</p>
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<dl compact>
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<dt>[EIO]</dt>
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<dd>The process group of the writing process is orphaned, and the writing process is not ignoring or blocking SIGTTOU.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_767_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_767_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_767_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_767_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_767_10"></a>SEE ALSO</h4>
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<blockquote>
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<p>The Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap11.html#tag_11">Chapter 11, General
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Terminal Interface</a>, <a href="../basedefs/termios.h.html"><i><termios.h></i></a>, <a href=
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"../basedefs/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_767_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p>
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</blockquote>
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<h4><a name="tag_03_767_12"></a>Issue 6</h4>
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<blockquote>
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<p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>In the DESCRIPTION, text previously conditional on _POSIX_JOB_CONTROL is now mandated. This is a FIPS requirement.</p>
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</li>
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<li>
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<p>The [EIO] error is added.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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