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  112. <li><strong>nixio.Socket</strong></li>
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  138. <h1>Object Instance <code>nixio.Socket</code></h1>
  139. <p>
  140. Socket Object.
  141. Supports IPv4, IPv6 and UNIX (POSIX only) families.</p>
  142. <h2>Functions</h2>
  143. <table class="function_list">
  144. <tr>
  145. <td class="name" nowrap><a href="#Socket.accept">Socket:accept</a>&nbsp;()</td>
  146. <td class="summary">
  147. Accept a connection on the socket.</td>
  148. </tr>
  149. <tr>
  150. <td class="name" nowrap><a href="#Socket.bind">Socket:bind</a>&nbsp;(host, port)</td>
  151. <td class="summary">
  152. Bind the socket to a network address.</td>
  153. </tr>
  154. <tr>
  155. <td class="name" nowrap><a href="#Socket.close">Socket:close</a>&nbsp;()</td>
  156. <td class="summary">
  157. Close the socket.</td>
  158. </tr>
  159. <tr>
  160. <td class="name" nowrap><a href="#Socket.connect">Socket:connect</a>&nbsp;(host, port)</td>
  161. <td class="summary">
  162. Connect the socket to a network address.</td>
  163. </tr>
  164. <tr>
  165. <td class="name" nowrap><a href="#Socket.fileno">Socket:fileno</a>&nbsp;()</td>
  166. <td class="summary">
  167. Get the number of the filedescriptor.</td>
  168. </tr>
  169. <tr>
  170. <td class="name" nowrap><a href="#Socket.getopt">Socket:getopt</a>&nbsp;(level, option)</td>
  171. <td class="summary">
  172. Get a socket option.</td>
  173. </tr>
  174. <tr>
  175. <td class="name" nowrap><a href="#Socket.getpeername">Socket:getpeername</a>&nbsp;()</td>
  176. <td class="summary">
  177. Get the peer address of a socket.</td>
  178. </tr>
  179. <tr>
  180. <td class="name" nowrap><a href="#Socket.getsockname">Socket:getsockname</a>&nbsp;()</td>
  181. <td class="summary">
  182. Get the local address of a socket.</td>
  183. </tr>
  184. <tr>
  185. <td class="name" nowrap><a href="#Socket.listen">Socket:listen</a>&nbsp;(backlog)</td>
  186. <td class="summary">
  187. Listen for connections on the socket.</td>
  188. </tr>
  189. <tr>
  190. <td class="name" nowrap><a href="#Socket.read ">Socket:read </a>&nbsp;(length)</td>
  191. <td class="summary">
  192. Receive a message on the socket (This is an alias for recv).</td>
  193. </tr>
  194. <tr>
  195. <td class="name" nowrap><a href="#Socket.recv ">Socket:recv </a>&nbsp;(length)</td>
  196. <td class="summary">
  197. Receive a message on the socket.</td>
  198. </tr>
  199. <tr>
  200. <td class="name" nowrap><a href="#Socket.recvfrom">Socket:recvfrom</a>&nbsp;(length)</td>
  201. <td class="summary">
  202. Receive a message on the socket including the senders source address.</td>
  203. </tr>
  204. <tr>
  205. <td class="name" nowrap><a href="#Socket.send">Socket:send</a>&nbsp;(buffer, offset, length)</td>
  206. <td class="summary">
  207. Send a message on the socket.</td>
  208. </tr>
  209. <tr>
  210. <td class="name" nowrap><a href="#Socket.sendto">Socket:sendto</a>&nbsp;(buffer, host, port, offset, length)</td>
  211. <td class="summary">
  212. Send a message on the socket specifying the destination.</td>
  213. </tr>
  214. <tr>
  215. <td class="name" nowrap><a href="#Socket.setblocking">Socket:setblocking</a>&nbsp;(blocking)</td>
  216. <td class="summary">
  217. Set the blocking mode of the socket.</td>
  218. </tr>
  219. <tr>
  220. <td class="name" nowrap><a href="#Socket.setopt">Socket:setopt</a>&nbsp;(level, option, value)</td>
  221. <td class="summary">
  222. Set a socket option.</td>
  223. </tr>
  224. <tr>
  225. <td class="name" nowrap><a href="#Socket.shutdown">Socket:shutdown</a>&nbsp;(how)</td>
  226. <td class="summary">
  227. Shut down part of a full-duplex connection.</td>
  228. </tr>
  229. <tr>
  230. <td class="name" nowrap><a href="#Socket.write">Socket:write</a>&nbsp;(buffer, offset, length)</td>
  231. <td class="summary">
  232. Send a message on the socket (This is an alias for send).</td>
  233. </tr>
  234. </table>
  235. <br/>
  236. <br/>
  237. <h2><a name="functions"></a>Functions</h2>
  238. <dl class="function">
  239. <dt><a name="Socket.accept"></a><strong>Socket:accept</strong>&nbsp;()</dt>
  240. <dd>
  241. Accept a connection on the socket.
  242. <h3>Return values:</h3>
  243. <ol>
  244. <li>Socket Object
  245. <li>Peer IP-Address
  246. <li>Peer Port
  247. </ol>
  248. </dd>
  249. <dt><a name="Socket.bind"></a><strong>Socket:bind</strong>&nbsp;(host, port)</dt>
  250. <dd>
  251. Bind the socket to a network address.
  252. <h3>Parameters</h3>
  253. <ul>
  254. <li>
  255. host: Host (optional, default: all addresses)
  256. </li>
  257. <li>
  258. port: Port or service description
  259. </li>
  260. </ul>
  261. <h3>Usage</h3>
  262. <ul>
  263. <li>This function calls getaddrinfo() and bind() but NOT listen().
  264. <li>If <em>host</em> is a domain name it will be looked up and bind()
  265. tries the IP-Addresses in the order returned by the DNS resolver
  266. until the bind succeeds.
  267. <li>UNIX sockets ignore the <em>port</em>,
  268. and interpret <em>host</em> as a socket path.
  269. </ul>
  270. <h3>Return value:</h3>
  271. true
  272. </dd>
  273. <dt><a name="Socket.close"></a><strong>Socket:close</strong>&nbsp;()</dt>
  274. <dd>
  275. Close the socket.
  276. <h3>Return value:</h3>
  277. true
  278. </dd>
  279. <dt><a name="Socket.connect"></a><strong>Socket:connect</strong>&nbsp;(host, port)</dt>
  280. <dd>
  281. Connect the socket to a network address.
  282. <h3>Parameters</h3>
  283. <ul>
  284. <li>
  285. host: Hostname or IP-Address (optional, default: localhost)
  286. </li>
  287. <li>
  288. port: Port or service description
  289. </li>
  290. </ul>
  291. <h3>Usage</h3>
  292. <ul>
  293. <li>This function calls getaddrinfo() and connect().
  294. <li>If <em>host</em> is a domain name it will be looked up and connect()
  295. tries the IP-Addresses in the order returned by the DNS resolver
  296. until the connect succeeds.
  297. <li>UNIX sockets ignore the <em>port</em>,
  298. and interpret <em>host</em> as a socket path.
  299. </ul>
  300. <h3>Return value:</h3>
  301. true
  302. </dd>
  303. <dt><a name="Socket.fileno"></a><strong>Socket:fileno</strong>&nbsp;()</dt>
  304. <dd>
  305. Get the number of the filedescriptor.
  306. <h3>Return value:</h3>
  307. file descriptor number
  308. </dd>
  309. <dt><a name="Socket.getopt"></a><strong>Socket:getopt</strong>&nbsp;(level, option)</dt>
  310. <dd>
  311. Get a socket option.
  312. <h3>Parameters</h3>
  313. <ul>
  314. <li>
  315. level: Level ["socket", "tcp", "ip", "ipv6"]
  316. </li>
  317. <li>
  318. option: Option ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
  319. "priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
  320. "bindtodevice", "error", "oobinline", "cork" (TCP), "nodelay" (TCP),
  321. "mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
  322. (IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
  323. (IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
  324. </li>
  325. </ul>
  326. <h3>Return value:</h3>
  327. Value
  328. </dd>
  329. <dt><a name="Socket.getpeername"></a><strong>Socket:getpeername</strong>&nbsp;()</dt>
  330. <dd>
  331. Get the peer address of a socket.
  332. <h3>Return values:</h3>
  333. <ol>
  334. <li>IP-Address
  335. <li>Port
  336. </ol>
  337. </dd>
  338. <dt><a name="Socket.getsockname"></a><strong>Socket:getsockname</strong>&nbsp;()</dt>
  339. <dd>
  340. Get the local address of a socket.
  341. <h3>Return values:</h3>
  342. <ol>
  343. <li>IP-Address
  344. <li>Port
  345. </ol>
  346. </dd>
  347. <dt><a name="Socket.listen"></a><strong>Socket:listen</strong>&nbsp;(backlog)</dt>
  348. <dd>
  349. Listen for connections on the socket.
  350. <h3>Parameters</h3>
  351. <ul>
  352. <li>
  353. backlog: Length of queue for pending connections
  354. </li>
  355. </ul>
  356. <h3>Return value:</h3>
  357. true
  358. </dd>
  359. <dt><a name="Socket.read "></a><strong>Socket:read </strong>&nbsp;(length)</dt>
  360. <dd>
  361. Receive a message on the socket (This is an alias for recv).
  362. See the recvfrom description for more details.
  363. <h3>Parameters</h3>
  364. <ul>
  365. <li>
  366. length: Amount of data to read (in Bytes).
  367. </li>
  368. </ul>
  369. <h3>Return value:</h3>
  370. buffer containing data successfully read
  371. <h3>See also:</h3>
  372. <ul>
  373. <li><a href="#Socket.recvfrom">
  374. Socket:recvfrom
  375. </a>
  376. </ul>
  377. </dd>
  378. <dt><a name="Socket.recv "></a><strong>Socket:recv </strong>&nbsp;(length)</dt>
  379. <dd>
  380. Receive a message on the socket.
  381. This function is identical to recvfrom except that it does not return
  382. the sender's source address. See the recvfrom description for more details.
  383. <h3>Parameters</h3>
  384. <ul>
  385. <li>
  386. length: Amount of data to read (in Bytes).
  387. </li>
  388. </ul>
  389. <h3>Return value:</h3>
  390. buffer containing data successfully read
  391. <h3>See also:</h3>
  392. <ul>
  393. <li><a href="#Socket.recvfrom">
  394. Socket:recvfrom
  395. </a>
  396. </ul>
  397. </dd>
  398. <dt><a name="Socket.recvfrom"></a><strong>Socket:recvfrom</strong>&nbsp;(length)</dt>
  399. <dd>
  400. Receive a message on the socket including the senders source address.
  401. <h3>Parameters</h3>
  402. <ul>
  403. <li>
  404. length: Amount of data to read (in Bytes).
  405. </li>
  406. </ul>
  407. <h3>Usage</h3>
  408. <ul>
  409. <li><strong>Warning:</strong> It is not guaranteed that all requested data
  410. is read at once.
  411. You have to check the return value - the length of the buffer actually read -
  412. or use the safe IO functions in the high-level IO utility module.
  413. <li>The length of the return buffer is limited by the (compile time)
  414. nixio buffersize which is <em>nixio.const.buffersize</em> (8192 by default).
  415. Any read request greater than that will be safely truncated to this value.
  416. </ul>
  417. <h3>Return values:</h3>
  418. <ol>
  419. <li>buffer containing data successfully read
  420. <li>host IP-Address of the sender
  421. <li>port Port of the sender
  422. </ol>
  423. </dd>
  424. <dt><a name="Socket.send"></a><strong>Socket:send</strong>&nbsp;(buffer, offset, length)</dt>
  425. <dd>
  426. Send a message on the socket.
  427. This function is identical to sendto except for the missing destination
  428. parameters. See the sendto description for a detailed description.
  429. <h3>Parameters</h3>
  430. <ul>
  431. <li>
  432. buffer: Buffer holding the data to be written.
  433. </li>
  434. <li>
  435. offset: Offset to start reading the buffer from. (optional)
  436. </li>
  437. <li>
  438. length: Length of chunk to read from the buffer. (optional)
  439. </li>
  440. </ul>
  441. <h3>Return value:</h3>
  442. number of bytes written
  443. <h3>See also:</h3>
  444. <ul>
  445. <li><a href="#Socket.sendto">
  446. Socket:sendto
  447. </a>
  448. </ul>
  449. </dd>
  450. <dt><a name="Socket.sendto"></a><strong>Socket:sendto</strong>&nbsp;(buffer, host, port, offset, length)</dt>
  451. <dd>
  452. Send a message on the socket specifying the destination.
  453. <h3>Parameters</h3>
  454. <ul>
  455. <li>
  456. buffer: Buffer holding the data to be written.
  457. </li>
  458. <li>
  459. host: Target IP-Address
  460. </li>
  461. <li>
  462. port: Target Port
  463. </li>
  464. <li>
  465. offset: Offset to start reading the buffer from. (optional)
  466. </li>
  467. <li>
  468. length: Length of chunk to read from the buffer. (optional)
  469. </li>
  470. </ul>
  471. <h3>Usage</h3>
  472. <ul>
  473. <li><strong>Warning:</strong> It is not guaranteed that all data
  474. in the buffer is written at once.
  475. You have to check the return value - the number of bytes actually written -
  476. or use the safe IO functions in the high-level IO utility module.
  477. <li>Unlike standard Lua indexing the lowest offset and default is 0.
  478. </ul>
  479. <h3>Return value:</h3>
  480. number of bytes written
  481. </dd>
  482. <dt><a name="Socket.setblocking"></a><strong>Socket:setblocking</strong>&nbsp;(blocking)</dt>
  483. <dd>
  484. Set the blocking mode of the socket.
  485. <h3>Parameters</h3>
  486. <ul>
  487. <li>
  488. blocking: (boolean)
  489. </li>
  490. </ul>
  491. <h3>Return value:</h3>
  492. true
  493. </dd>
  494. <dt><a name="Socket.setopt"></a><strong>Socket:setopt</strong>&nbsp;(level, option, value)</dt>
  495. <dd>
  496. Set a socket option.
  497. <h3>Parameters</h3>
  498. <ul>
  499. <li>
  500. level: Level ["socket", "tcp", "ip", "ipv6"]
  501. </li>
  502. <li>
  503. option: Option ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
  504. "priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
  505. "bindtodevice", "error", "oobinline", "cork" (TCP), "nodelay" (TCP),
  506. "mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
  507. (IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
  508. (IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
  509. </li>
  510. <li>
  511. value: Value
  512. </li>
  513. </ul>
  514. <h3>Return value:</h3>
  515. true
  516. </dd>
  517. <dt><a name="Socket.shutdown"></a><strong>Socket:shutdown</strong>&nbsp;(how)</dt>
  518. <dd>
  519. Shut down part of a full-duplex connection.
  520. <h3>Parameters</h3>
  521. <ul>
  522. <li>
  523. how: (optional, default: rdwr) ["rdwr", "rd", "wr"]
  524. </li>
  525. </ul>
  526. <h3>Return value:</h3>
  527. true
  528. </dd>
  529. <dt><a name="Socket.write"></a><strong>Socket:write</strong>&nbsp;(buffer, offset, length)</dt>
  530. <dd>
  531. Send a message on the socket (This is an alias for send).
  532. See the sendto description for a detailed description.
  533. <h3>Parameters</h3>
  534. <ul>
  535. <li>
  536. buffer: Buffer holding the data to be written.
  537. </li>
  538. <li>
  539. offset: Offset to start reading the buffer from. (optional)
  540. </li>
  541. <li>
  542. length: Length of chunk to read from the buffer. (optional)
  543. </li>
  544. </ul>
  545. <h3>Return value:</h3>
  546. number of bytes written
  547. <h3>See also:</h3>
  548. <ul>
  549. <li><a href="#Socket.sendto">
  550. Socket:sendto
  551. </a>
  552. </ul>
  553. </dd>
  554. </dl>
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