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1691df013fSAsim Jamshed<title>mtcp_write</title>
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20*e5df9dc1SAsim Jamshed<div class="main">
2191df013fSAsim Jamshed<h1 align="center">mtcp_write</h1>
22*e5df9dc1SAsim Jamshed<!--
2391df013fSAsim Jamshed<a href="#NAME">NAME</a><br>
2491df013fSAsim Jamshed<a href="#SYNOPSIS">SYNOPSIS</a><br>
2591df013fSAsim Jamshed<a href="#DESCRIPTION">DESCRIPTION</a><br>
2691df013fSAsim Jamshed<a href="#RETURN VALUE">RETURN VALUE</a><br>
2791df013fSAsim Jamshed<a href="#ERRORS">ERRORS</a><br>
2891df013fSAsim Jamshed<a href="#AUTHORS">AUTHORS</a><br>
2991df013fSAsim Jamshed<a href="#SEE ALSO">SEE ALSO</a><br>
3091df013fSAsim Jamshed<a href="#COLOPHON">COLOPHON</a><br>
3191df013fSAsim Jamshed<hr>
32*e5df9dc1SAsim Jamshed-->
3391df013fSAsim Jamshed
3491df013fSAsim Jamshed<h2>NAME
3591df013fSAsim Jamshed<a name="NAME"></a>
3691df013fSAsim Jamshed</h2>
3791df013fSAsim Jamshed
3891df013fSAsim Jamshed
3991df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em">mtcp_write
4091df013fSAsim Jamshed&minus; send bytestream to an mTCP socket</p>
4191df013fSAsim Jamshed
4291df013fSAsim Jamshed<h2>SYNOPSIS
4391df013fSAsim Jamshed<a name="SYNOPSIS"></a>
4491df013fSAsim Jamshed</h2>
4591df013fSAsim Jamshed
4691df013fSAsim Jamshed
4791df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em"><b>#include
4891df013fSAsim Jamshed&lt;mtcp_api.h&gt;</b></p>
4991df013fSAsim Jamshed
5091df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em"><b>ssize_t
5191df013fSAsim Jamshedmtcp_write(mctx_t</b> <i>mctx</i><b>, int</b>
5291df013fSAsim Jamshed<i>sockid</i><b>, char *</b><i>buf</i><b>, size_t</b>
5391df013fSAsim Jamshed<i>len</i><b>);</b></p>
5491df013fSAsim Jamshed
5591df013fSAsim Jamshed<h2>DESCRIPTION
5691df013fSAsim Jamshed<a name="DESCRIPTION"></a>
5791df013fSAsim Jamshed</h2>
5891df013fSAsim Jamshed
5991df013fSAsim Jamshed
6091df013fSAsim Jamshed
6191df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em"><b>mtcp_write</b>()
6291df013fSAsim Jamshedsends up to <i>len</i> number of bytes from the buffer that
6391df013fSAsim Jamshedis being pointed by <i>buf.</i> The bytestream is sent to
6491df013fSAsim Jamshedthe mTCP socket using the <i>sockid</i> descriptor.</p>
6591df013fSAsim Jamshed
6691df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em">An
6791df013fSAsim Jamshed<b>mtcp_write()</b> function call may write less number of
6891df013fSAsim Jamshedbytes than <i>len</i> if there is insufficient space in the
6991df013fSAsim Jamshedwrite buffer of the socket. In such a case, the return value
7091df013fSAsim Jamshedis considered the actual number of bytes successfully
7191df013fSAsim Jamshedwritten.</p>
7291df013fSAsim Jamshed
7391df013fSAsim Jamshed
7491df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em"><b>mtcp_write</b>()
7591df013fSAsim Jamshedcall takes an additional argument named <i>mctx</i> that
7691df013fSAsim Jamshedrepresents the per-core mTCP context in an application (see
7791df013fSAsim Jamshed<b>mtcp_create_context()</b> for details).</p>
7891df013fSAsim Jamshed
7991df013fSAsim Jamshed<h2>RETURN VALUE
8091df013fSAsim Jamshed<a name="RETURN VALUE"></a>
8191df013fSAsim Jamshed</h2>
8291df013fSAsim Jamshed
8391df013fSAsim Jamshed
8491df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em">On success, the
8591df013fSAsim Jamshednumber of bytes dispatched via the socket are returned. The
8691df013fSAsim Jamshednumber of bytes sent can be less than <i>count</i> if there
8791df013fSAsim Jamshedis insufficient space in the write buffer of the socket. On
8891df013fSAsim Jamshederror, -1 is returned and <i>errno</i> is set
8991df013fSAsim Jamshedappropriately.</p>
9091df013fSAsim Jamshed
9191df013fSAsim Jamshed<h2>ERRORS
9291df013fSAsim Jamshed<a name="ERRORS"></a>
9391df013fSAsim Jamshed</h2>
9491df013fSAsim Jamshed
9591df013fSAsim Jamshed
9691df013fSAsim Jamshed<table width="100%" border="0" rules="none" frame="void"
9791df013fSAsim Jamshed       cellspacing="0" cellpadding="0">
9891df013fSAsim Jamshed<tr valign="top" align="left">
9991df013fSAsim Jamshed<td width="11%"></td>
10091df013fSAsim Jamshed<td width="12%">
10191df013fSAsim Jamshed
10291df013fSAsim Jamshed
10391df013fSAsim Jamshed<p style="margin-top: 1em"><b>EAGAIN</b></p></td>
10491df013fSAsim Jamshed<td width="3%"></td>
10591df013fSAsim Jamshed<td width="74%">
10691df013fSAsim Jamshed
10791df013fSAsim Jamshed
10891df013fSAsim Jamshed<p style="margin-top: 1em">The write buffer of the socket
10991df013fSAsim Jamshedis currently full. The user should call the write function
11091df013fSAsim Jamshedagain once the write buffer has space available.</p></td></tr>
11191df013fSAsim Jamshed<tr valign="top" align="left">
11291df013fSAsim Jamshed<td width="11%"></td>
11391df013fSAsim Jamshed<td width="12%">
11491df013fSAsim Jamshed
11591df013fSAsim Jamshed
11691df013fSAsim Jamshed<p><b>EBADF</b></p></td>
11791df013fSAsim Jamshed<td width="3%"></td>
11891df013fSAsim Jamshed<td width="74%">
11991df013fSAsim Jamshed
12091df013fSAsim Jamshed
12191df013fSAsim Jamshed<p><i>sockid</i> is not a valid socket descriptor for
12291df013fSAsim Jamshedwriting.</p> </td></tr>
12391df013fSAsim Jamshed<tr valign="top" align="left">
12491df013fSAsim Jamshed<td width="11%"></td>
12591df013fSAsim Jamshed<td width="12%">
12691df013fSAsim Jamshed
12791df013fSAsim Jamshed
12891df013fSAsim Jamshed<p><b>ENOTCONN</b></p></td>
12991df013fSAsim Jamshed<td width="3%"></td>
13091df013fSAsim Jamshed<td width="74%">
13191df013fSAsim Jamshed
13291df013fSAsim Jamshed
13391df013fSAsim Jamshed<p>The underlying connection is not in a TCP state that
13491df013fSAsim Jamshedallows data transmission (i.e. the TCP flow is neither in
13591df013fSAsim Jamshed<b>ESTABLISHED</b> or <b>CLOSE_WAIT</b> state).</p></td></tr>
13691df013fSAsim Jamshed<tr valign="top" align="left">
13791df013fSAsim Jamshed<td width="11%"></td>
13891df013fSAsim Jamshed<td width="12%">
13991df013fSAsim Jamshed
14091df013fSAsim Jamshed
14191df013fSAsim Jamshed<p><b>ENOTSOCK</b></p></td>
14291df013fSAsim Jamshed<td width="3%"></td>
14391df013fSAsim Jamshed<td width="74%">
14491df013fSAsim Jamshed
14591df013fSAsim Jamshed
14691df013fSAsim Jamshed<p>The socket referred to by <i>sockid</i> is not
14791df013fSAsim Jamshedvalid.</p> </td></tr>
14891df013fSAsim Jamshed</table>
14991df013fSAsim Jamshed
15091df013fSAsim Jamshed<h2>AUTHORS
15191df013fSAsim Jamshed<a name="AUTHORS"></a>
15291df013fSAsim Jamshed</h2>
15391df013fSAsim Jamshed
15491df013fSAsim Jamshed
155*e5df9dc1SAsim Jamshed<p style="margin-left:11%; margin-top: 1em">mOS
156*e5df9dc1SAsim Jamsheddevelopment team &lt;[email protected]&gt;</p>
15791df013fSAsim Jamshed
15891df013fSAsim Jamshed<h2>SEE ALSO
15991df013fSAsim Jamshed<a name="SEE ALSO"></a>
16091df013fSAsim Jamshed</h2>
16191df013fSAsim Jamshed
16291df013fSAsim Jamshed
16391df013fSAsim Jamshed
16491df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em"><b>mtcp_bind</b>(),
16591df013fSAsim Jamshed<b>mtcp_listen</b>(), <b>mtcp_accept</b>(),
16691df013fSAsim Jamshed<b>mtcp_connect</b>(), <b>mtcp_read</b>(),
16791df013fSAsim Jamshed<b>mtcp_socket</b>()</p>
16891df013fSAsim Jamshed
16991df013fSAsim Jamshed<h2>COLOPHON
17091df013fSAsim Jamshed<a name="COLOPHON"></a>
17191df013fSAsim Jamshed</h2>
17291df013fSAsim Jamshed
17391df013fSAsim Jamshed
17491df013fSAsim Jamshed<p style="margin-left:11%; margin-top: 1em">This page is
17591df013fSAsim Jamshedpart of mOS release 0.3 <i>docs</i> section. A description
17691df013fSAsim Jamshedof the project, and information about reporting bugs, can be
17791df013fSAsim Jamshedfound at http://mos.kaist.edu/.</p>
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