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<h1>Object Instance <code>nixio.Socket</code></h1>
<p>
Socket Object.
Supports IPv4, IPv6 and UNIX (POSIX only) families.</p>
<h2>Functions</h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#Socket.accept">Socket:accept</a>&nbsp;()</td>
<td class="summary">
Accept a connection on the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.bind">Socket:bind</a>&nbsp;(host, port)</td>
<td class="summary">
Bind the socket to a network address.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.close">Socket:close</a>&nbsp;()</td>
<td class="summary">
Close the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.connect">Socket:connect</a>&nbsp;(host, port)</td>
<td class="summary">
Connect the socket to a network address.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.fileno">Socket:fileno</a>&nbsp;()</td>
<td class="summary">
Get the number of the filedescriptor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.getopt">Socket:getopt</a>&nbsp;(level, option)</td>
<td class="summary">
Get a socket option.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.getpeername">Socket:getpeername</a>&nbsp;()</td>
<td class="summary">
Get the peer address of a socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.getsockname">Socket:getsockname</a>&nbsp;()</td>
<td class="summary">
Get the local address of a socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.listen">Socket:listen</a>&nbsp;(backlog)</td>
<td class="summary">
Listen for connections on the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.read ">Socket:read </a>&nbsp;(length)</td>
<td class="summary">
Receive a message on the socket (This is an alias for recv).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.recv ">Socket:recv </a>&nbsp;(length)</td>
<td class="summary">
Receive a message on the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.recvfrom">Socket:recvfrom</a>&nbsp;(length)</td>
<td class="summary">
Receive a message on the socket including the senders source address.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.send">Socket:send</a>&nbsp;(buffer, offset, length)</td>
<td class="summary">
Send a message on the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.sendto">Socket:sendto</a>&nbsp;(buffer, host, port, offset, length)</td>
<td class="summary">
Send a message on the socket specifying the destination.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.setblocking">Socket:setblocking</a>&nbsp;(blocking)</td>
<td class="summary">
Set the blocking mode of the socket.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.setopt">Socket:setopt</a>&nbsp;(level, option, value)</td>
<td class="summary">
Set a socket option.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.shutdown">Socket:shutdown</a>&nbsp;(how)</td>
<td class="summary">
Shut down part of a full-duplex connection.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Socket.write">Socket:write</a>&nbsp;(buffer, offset, length)</td>
<td class="summary">
Send a message on the socket (This is an alias for send).</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="functions"></a>Functions</h2>
<dl class="function">
<dt><a name="Socket.accept"></a><strong>Socket:accept</strong>&nbsp;()</dt>
<dd>
Accept a connection on the socket.
<h3>Return values:</h3>
<ol>
<li>Socket Object
<li>Peer IP-Address
<li>Peer Port
</ol>
</dd>
<dt><a name="Socket.bind"></a><strong>Socket:bind</strong>&nbsp;(host, port)</dt>
<dd>
Bind the socket to a network address.
<h3>Parameters</h3>
<ul>
<li>
host: Host (optional, default: all addresses)
</li>
<li>
port: Port or service description
</li>
</ul>
<h3>Usage</h3>
<ul>
<li>This function calls getaddrinfo() and bind() but NOT listen().
<li>If <em>host</em> is a domain name it will be looked up and bind()
tries the IP-Addresses in the order returned by the DNS resolver
until the bind succeeds.
<li>UNIX sockets ignore the <em>port</em>,
and interpret <em>host</em> as a socket path.
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.close"></a><strong>Socket:close</strong>&nbsp;()</dt>
<dd>
Close the socket.
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.connect"></a><strong>Socket:connect</strong>&nbsp;(host, port)</dt>
<dd>
Connect the socket to a network address.
<h3>Parameters</h3>
<ul>
<li>
host: Hostname or IP-Address (optional, default: localhost)
</li>
<li>
port: Port or service description
</li>
</ul>
<h3>Usage</h3>
<ul>
<li>This function calls getaddrinfo() and connect().
<li>If <em>host</em> is a domain name it will be looked up and connect()
tries the IP-Addresses in the order returned by the DNS resolver
until the connect succeeds.
<li>UNIX sockets ignore the <em>port</em>,
and interpret <em>host</em> as a socket path.
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.fileno"></a><strong>Socket:fileno</strong>&nbsp;()</dt>
<dd>
Get the number of the filedescriptor.
<h3>Return value:</h3>
file descriptor number
</dd>
<dt><a name="Socket.getopt"></a><strong>Socket:getopt</strong>&nbsp;(level, option)</dt>
<dd>
Get a socket option.
<h3>Parameters</h3>
<ul>
<li>
level: Level ["socket", "tcp", "ip", "ipv6"]
</li>
<li>
option: Option ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
"priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
"bindtodevice", "error", "oobinline", "cork" (TCP), "nodelay" (TCP),
"mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
(IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
(IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
</li>
</ul>
<h3>Return value:</h3>
Value
</dd>
<dt><a name="Socket.getpeername"></a><strong>Socket:getpeername</strong>&nbsp;()</dt>
<dd>
Get the peer address of a socket.
<h3>Return values:</h3>
<ol>
<li>IP-Address
<li>Port
</ol>
</dd>
<dt><a name="Socket.getsockname"></a><strong>Socket:getsockname</strong>&nbsp;()</dt>
<dd>
Get the local address of a socket.
<h3>Return values:</h3>
<ol>
<li>IP-Address
<li>Port
</ol>
</dd>
<dt><a name="Socket.listen"></a><strong>Socket:listen</strong>&nbsp;(backlog)</dt>
<dd>
Listen for connections on the socket.
<h3>Parameters</h3>
<ul>
<li>
backlog: Length of queue for pending connections
</li>
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.read "></a><strong>Socket:read </strong>&nbsp;(length)</dt>
<dd>
Receive a message on the socket (This is an alias for recv).
See the recvfrom description for more details.
<h3>Parameters</h3>
<ul>
<li>
length: Amount of data to read (in Bytes).
</li>
</ul>
<h3>Return value:</h3>
buffer containing data successfully read
<h3>See also:</h3>
<ul>
<li><a href="#Socket.recvfrom">
Socket:recvfrom
</a>
</ul>
</dd>
<dt><a name="Socket.recv "></a><strong>Socket:recv </strong>&nbsp;(length)</dt>
<dd>
Receive a message on the socket.
This function is identical to recvfrom except that it does not return
the sender's source address. See the recvfrom description for more details.
<h3>Parameters</h3>
<ul>
<li>
length: Amount of data to read (in Bytes).
</li>
</ul>
<h3>Return value:</h3>
buffer containing data successfully read
<h3>See also:</h3>
<ul>
<li><a href="#Socket.recvfrom">
Socket:recvfrom
</a>
</ul>
</dd>
<dt><a name="Socket.recvfrom"></a><strong>Socket:recvfrom</strong>&nbsp;(length)</dt>
<dd>
Receive a message on the socket including the senders source address.
<h3>Parameters</h3>
<ul>
<li>
length: Amount of data to read (in Bytes).
</li>
</ul>
<h3>Usage</h3>
<ul>
<li><strong>Warning:</strong> It is not guaranteed that all requested data
is read at once.
You have to check the return value - the length of the buffer actually read -
or use the safe IO functions in the high-level IO utility module.
<li>The length of the return buffer is limited by the (compile time)
nixio buffersize which is <em>nixio.const.buffersize</em> (8192 by default).
Any read request greater than that will be safely truncated to this value.
</ul>
<h3>Return values:</h3>
<ol>
<li>buffer containing data successfully read
<li>host IP-Address of the sender
<li>port Port of the sender
</ol>
</dd>
<dt><a name="Socket.send"></a><strong>Socket:send</strong>&nbsp;(buffer, offset, length)</dt>
<dd>
Send a message on the socket.
This function is identical to sendto except for the missing destination
documentation: Fix typos (found by codespell) Signed-off-by: Stefan Weil <sw@weilnetz.de>
2016-03-26 09:11:33 +00:00
parameters. See the sendto description for a detailed description.
Add generated documentation to repository Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
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<h3>Parameters</h3>
<ul>
<li>
buffer: Buffer holding the data to be written.
</li>
<li>
offset: Offset to start reading the buffer from. (optional)
</li>
<li>
length: Length of chunk to read from the buffer. (optional)
</li>
</ul>
<h3>Return value:</h3>
number of bytes written
<h3>See also:</h3>
<ul>
<li><a href="#Socket.sendto">
Socket:sendto
</a>
</ul>
</dd>
<dt><a name="Socket.sendto"></a><strong>Socket:sendto</strong>&nbsp;(buffer, host, port, offset, length)</dt>
<dd>
Send a message on the socket specifying the destination.
<h3>Parameters</h3>
<ul>
<li>
buffer: Buffer holding the data to be written.
</li>
<li>
host: Target IP-Address
</li>
<li>
port: Target Port
</li>
<li>
offset: Offset to start reading the buffer from. (optional)
</li>
<li>
length: Length of chunk to read from the buffer. (optional)
</li>
</ul>
<h3>Usage</h3>
<ul>
<li><strong>Warning:</strong> It is not guaranteed that all data
in the buffer is written at once.
You have to check the return value - the number of bytes actually written -
or use the safe IO functions in the high-level IO utility module.
<li>Unlike standard Lua indexing the lowest offset and default is 0.
</ul>
<h3>Return value:</h3>
number of bytes written
</dd>
<dt><a name="Socket.setblocking"></a><strong>Socket:setblocking</strong>&nbsp;(blocking)</dt>
<dd>
Set the blocking mode of the socket.
<h3>Parameters</h3>
<ul>
<li>
blocking: (boolean)
</li>
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.setopt"></a><strong>Socket:setopt</strong>&nbsp;(level, option, value)</dt>
<dd>
Set a socket option.
<h3>Parameters</h3>
<ul>
<li>
level: Level ["socket", "tcp", "ip", "ipv6"]
</li>
<li>
option: Option ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
"priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
"bindtodevice", "error", "oobinline", "cork" (TCP), "nodelay" (TCP),
"mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
(IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
(IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
</li>
<li>
value: Value
</li>
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.shutdown"></a><strong>Socket:shutdown</strong>&nbsp;(how)</dt>
<dd>
Shut down part of a full-duplex connection.
<h3>Parameters</h3>
<ul>
<li>
how: (optional, default: rdwr) ["rdwr", "rd", "wr"]
</li>
</ul>
<h3>Return value:</h3>
true
</dd>
<dt><a name="Socket.write"></a><strong>Socket:write</strong>&nbsp;(buffer, offset, length)</dt>
<dd>
Send a message on the socket (This is an alias for send).
See the sendto description for a detailed description.
<h3>Parameters</h3>
<ul>
<li>
buffer: Buffer holding the data to be written.
</li>
<li>
offset: Offset to start reading the buffer from. (optional)
</li>
<li>
length: Length of chunk to read from the buffer. (optional)
</li>
</ul>
<h3>Return value:</h3>
number of bytes written
<h3>See also:</h3>
<ul>
<li><a href="#Socket.sendto">
Socket:sendto
</a>
</ul>
</dd>
</dl>
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