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<title>tcdrain</title>
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<basefont size="3"> <a name="tcdrain"></a> <a name="tag_03_761"></a><!-- tcdrain -->
<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_03_761_01"></a>NAME</h4>
<blockquote>tcdrain - wait for transmission of output</blockquote>
<h4><a name="tag_03_761_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<p><code><tt>#include &lt;<a href="../basedefs/termios.h.html">termios.h</a>&gt;<br>
<br>
int tcdrain(int</tt> <i>fildes</i><tt>);<br>
</tt></code></p>
</blockquote>
<h4><a name="tag_03_761_03"></a>DESCRIPTION</h4>
<blockquote>
<p>The <i>tcdrain</i>() function shall block until all output written to the object referred to by <i>fildes</i> is transmitted.
The <i>fildes</i> argument is an open file descriptor associated with a terminal.</p>
<p>Any attempts to use <i>tcdrain</i>() from a process which is a member of a background process group on a <i>fildes</i>
associated with its controlling terminal, shall cause the process group to be sent a SIGTTOU signal. If the calling process is
blocking or ignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent.</p>
</blockquote>
<h4><a name="tag_03_761_04"></a>RETURN VALUE</h4>
<blockquote>
<p>Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and <i>errno</i> set to indicate the error.</p>
</blockquote>
<h4><a name="tag_03_761_05"></a>ERRORS</h4>
<blockquote>
<p>The <i>tcdrain</i>() function shall fail if:</p>
<dl compact>
<dt>[EBADF]</dt>
<dd>The <i>fildes</i> argument is not a valid file descriptor.</dd>
<dt>[EINTR]</dt>
<dd>A signal interrupted <i>tcdrain</i>().</dd>
<dt>[ENOTTY]</dt>
<dd>The file associated with <i>fildes</i> is not a terminal.</dd>
</dl>
<p>The <i>tcdrain</i>() function may fail if:</p>
<dl compact>
<dt>[EIO]</dt>
<dd>The process group of the writing process is orphaned, and the writing process is not ignoring or blocking SIGTTOU.</dd>
</dl>
</blockquote>
<hr>
<div class="box"><em>The following sections are informative.</em></div>
<h4><a name="tag_03_761_06"></a>EXAMPLES</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_761_07"></a>APPLICATION USAGE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_761_08"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_761_09"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_03_761_10"></a>SEE ALSO</h4>
<blockquote>
<p><a href="tcflush.html"><i>tcflush</i>()</a> , the Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href=
"../basedefs/xbd_chap11.html#tag_11">Chapter 11, General Terminal Interface</a>, <a href=
"../basedefs/termios.h.html"><i>&lt;termios.h&gt;</i></a>, <a href="../basedefs/unistd.h.html"><i>&lt;unistd.h&gt;</i></a></p>
</blockquote>
<h4><a name="tag_03_761_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_761_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>In the DESCRIPTION, the final paragraph is no longer conditional on _POSIX_JOB_CONTROL. This is a FIPS requirement.</p>
</li>
<li>
<p>The [EIO] error is added.</p>
</li>
</ul>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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