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 194
 195 <h1>Object Instance <code>nixio.Socket</code></h1>
 196
 197 <p>
 198  Socket Object.
 199  Supports IPv4, IPv6 and UNIX (POSIX only) families.</p>
 200
 201
 202
 203
 204
 205
 206
 207 <h2>Functions</h2>
 208 <table class="function_list">
 209
 210         <tr>
 211         <td class="name" nowrap><a href="#Socket.accept">Socket:accept</a>&nbsp;()</td>
 212         <td class="summary">
 213  Accept a connection on the socket.</td>
 214         </tr>
 215
 216         <tr>
 217         <td class="name" nowrap><a href="#Socket.bind">Socket:bind</a>&nbsp;(host, port)</td>
 218         <td class="summary">
 219  Bind the socket to a network address.</td>
 220         </tr>
 221
 222         <tr>
 223         <td class="name" nowrap><a href="#Socket.close">Socket:close</a>&nbsp;()</td>
 224         <td class="summary">
 225  Close the socket.</td>
 226         </tr>
 227
 228         <tr>
 229         <td class="name" nowrap><a href="#Socket.connect">Socket:connect</a>&nbsp;(host, port)</td>
 230         <td class="summary">
 231  Connect the socket to a network address.</td>
 232         </tr>
 233
 234         <tr>
 235         <td class="name" nowrap><a href="#Socket.fileno">Socket:fileno</a>&nbsp;()</td>
 236         <td class="summary">
 237  Get the number of the filedescriptor.</td>
 238         </tr>
 239
 240         <tr>
 241         <td class="name" nowrap><a href="#Socket.getopt">Socket:getopt</a>&nbsp;(level, option)</td>
 242         <td class="summary">
 243  Get a socket option.</td>
 244         </tr>
 245
 246         <tr>
 247         <td class="name" nowrap><a href="#Socket.getpeername">Socket:getpeername</a>&nbsp;()</td>
 248         <td class="summary">
 249  Get the peer address of a socket.</td>
 250         </tr>
 251
 252         <tr>
 253         <td class="name" nowrap><a href="#Socket.getsockname">Socket:getsockname</a>&nbsp;()</td>
 254         <td class="summary">
 255  Get the local address of a socket.</td>
 256         </tr>
 257
 258         <tr>
 259         <td class="name" nowrap><a href="#Socket.listen">Socket:listen</a>&nbsp;(backlog)</td>
 260         <td class="summary">
 261  Listen for connections on the socket.</td>
 262         </tr>
 263
 264         <tr>
 265         <td class="name" nowrap><a href="#Socket.read  ">Socket:read  </a>&nbsp;(length)</td>
 266         <td class="summary">
 267  Receive a message on the socket (This is an alias for recv).</td>
 268         </tr>
 269
 270         <tr>
 271         <td class="name" nowrap><a href="#Socket.recv  ">Socket:recv  </a>&nbsp;(length)</td>
 272         <td class="summary">
 273  Receive a message on the socket.</td>
 274         </tr>
 275
 276         <tr>
 277         <td class="name" nowrap><a href="#Socket.recvfrom">Socket:recvfrom</a>&nbsp;(length)</td>
 278         <td class="summary">
 279  Receive a message on the socket including the senders source address.</td>
 280         </tr>
 281
 282         <tr>
 283         <td class="name" nowrap><a href="#Socket.send">Socket:send</a>&nbsp;(buffer, offset, length)</td>
 284         <td class="summary">
 285  Send a message on the socket.</td>
 286         </tr>
 287
 288         <tr>
 289         <td class="name" nowrap><a href="#Socket.sendto">Socket:sendto</a>&nbsp;(buffer, host, port, offset, length)</td>
 290         <td class="summary">
 291  Send a message on the socket specifying the destination.</td>
 292         </tr>
 293
 294         <tr>
 295         <td class="name" nowrap><a href="#Socket.setblocking">Socket:setblocking</a>&nbsp;(blocking)</td>
 296         <td class="summary">
 297  Set the blocking mode of the socket.</td>
 298         </tr>
 299
 300         <tr>
 301         <td class="name" nowrap><a href="#Socket.setopt">Socket:setopt</a>&nbsp;(level, option, value)</td>
 302         <td class="summary">
 303  Set a socket option.</td>
 304         </tr>
 305
 306         <tr>
 307         <td class="name" nowrap><a href="#Socket.shutdown">Socket:shutdown</a>&nbsp;(how)</td>
 308         <td class="summary">
 309  Shut down part of a full-duplex connection.</td>
 310         </tr>
 311
 312         <tr>
 313         <td class="name" nowrap><a href="#Socket.write">Socket:write</a>&nbsp;(buffer, offset, length)</td>
 314         <td class="summary">
 315  Send a message on the socket (This is an alias for send).</td>
 316         </tr>
 317
 318 </table>
 319
 320
 321
 322
 323
 324
 325 <br/>
 326 <br/>
 327
 328
 329 <h2><a name="functions"></a>Functions</h2>
 330 <dl class="function">
 331
 332
 333
 334 <dt><a name="Socket.accept"></a><strong>Socket:accept</strong>&nbsp;()</dt>
 335 <dd>
 336
 337  Accept a connection on the socket.
 338
 339
 340
 341
 342
 343
 344
 345 <h3>Return values:</h3>
 346 <ol>
 347
 348         <li>Socket Object
 349
 350         <li>Peer IP-Address
 351
 352         <li>Peer Port
 353
 354 </ol>
 355
 356
 357
 358 </dd>
 359
 360
 361
 362
 363 <dt><a name="Socket.bind"></a><strong>Socket:bind</strong>&nbsp;(host, port)</dt>
 364 <dd>
 365
 366  Bind the socket to a network address.
 367
 368
 369 <h3>Parameters</h3>
 370 <ul>
 371
 372         <li>
 373           host: Host (optional, default: all addresses)
 374         </li>
 375
 376         <li>
 377           port: Port or service description
 378         </li>
 379
 380 </ul>
 381
 382
 383
 384
 385 <h3>Usage</h3>
 386 <ul>
 387
 388         <li>This function calls getaddrinfo() and bind() but NOT listen().
 389
 390         <li>If <em>host</em> is a domain name it will be looked up and bind()
 391  tries the IP-Addresses in the order returned by the DNS resolver
 392  until the bind succeeds.
 393
 394         <li>UNIX sockets ignore the <em>port</em>,
 395  and interpret <em>host</em> as a socket path.
 396
 397 </ul>
 398
 399
 400
 401 <h3>Return value:</h3>
 402 true
 403
 404
 405
 406 </dd>
 407
 408
 409
 410
 411 <dt><a name="Socket.close"></a><strong>Socket:close</strong>&nbsp;()</dt>
 412 <dd>
 413
 414  Close the socket.
 415
 416
 417
 418
 419
 420
 421
 422 <h3>Return value:</h3>
 423 true
 424
 425
 426
 427 </dd>
 428
 429
 430
 431
 432 <dt><a name="Socket.connect"></a><strong>Socket:connect</strong>&nbsp;(host, port)</dt>
 433 <dd>
 434
 435  Connect the socket to a network address.
 436
 437
 438 <h3>Parameters</h3>
 439 <ul>
 440
 441         <li>
 442           host: Hostname or IP-Address (optional, default: localhost)
 443         </li>
 444
 445         <li>
 446           port: Port or service description
 447         </li>
 448
 449 </ul>
 450
 451
 452
 453
 454 <h3>Usage</h3>
 455 <ul>
 456
 457         <li>This function calls getaddrinfo() and connect().
 458
 459         <li>If <em>host</em> is a domain name it will be looked up and connect()
 460  tries the IP-Addresses in the order returned by the DNS resolver
 461  until the connect succeeds.
 462
 463         <li>UNIX sockets ignore the <em>port</em>,
 464  and interpret <em>host</em> as a socket path.
 465
 466 </ul>
 467
 468
 469
 470 <h3>Return value:</h3>
 471 true
 472
 473
 474
 475 </dd>
 476
 477
 478
 479
 480 <dt><a name="Socket.fileno"></a><strong>Socket:fileno</strong>&nbsp;()</dt>
 481 <dd>
 482
 483  Get the number of the filedescriptor.
 484
 485
 486
 487
 488
 489
 490
 491 <h3>Return value:</h3>
 492 file descriptor number
 493
 494
 495
 496 </dd>
 497
 498
 499
 500
 501 <dt><a name="Socket.getopt"></a><strong>Socket:getopt</strong>&nbsp;(level, option)</dt>
 502 <dd>
 503
 504  Get a socket option.
 505
 506
 507 <h3>Parameters</h3>
 508 <ul>
 509
 510         <li>
 511           level: Level ["socket", "tcp", "ip", "ipv6"]
 512         </li>
 513
 514         <li>
 515           option: Option        ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
 516  "priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
 517  "bindtodevice", "error", "oobinline", "cork" (TCP),  "nodelay" (TCP),
 518  "mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
 519  (IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
 520  (IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
 521         </li>
 522
 523 </ul>
 524
 525
 526
 527
 528
 529
 530 <h3>Return value:</h3>
 531 Value
 532
 533
 534
 535 </dd>
 536
 537
 538
 539
 540 <dt><a name="Socket.getpeername"></a><strong>Socket:getpeername</strong>&nbsp;()</dt>
 541 <dd>
 542
 543  Get the peer address of a socket.
 544
 545
 546
 547
 548
 549
 550
 551 <h3>Return values:</h3>
 552 <ol>
 553
 554         <li>IP-Address
 555
 556         <li>Port
 557
 558 </ol>
 559
 560
 561
 562 </dd>
 563
 564
 565
 566
 567 <dt><a name="Socket.getsockname"></a><strong>Socket:getsockname</strong>&nbsp;()</dt>
 568 <dd>
 569
 570  Get the local address of a socket.
 571
 572
 573
 574
 575
 576
 577
 578 <h3>Return values:</h3>
 579 <ol>
 580
 581         <li>IP-Address
 582
 583         <li>Port
 584
 585 </ol>
 586
 587
 588
 589 </dd>
 590
 591
 592
 593
 594 <dt><a name="Socket.listen"></a><strong>Socket:listen</strong>&nbsp;(backlog)</dt>
 595 <dd>
 596
 597  Listen for connections on the socket.
 598
 599
 600 <h3>Parameters</h3>
 601 <ul>
 602
 603         <li>
 604           backlog: Length of queue for pending connections
 605         </li>
 606
 607 </ul>
 608
 609
 610
 611
 612
 613
 614 <h3>Return value:</h3>
 615 true
 616
 617
 618
 619 </dd>
 620
 621
 622
 623
 624 <dt><a name="Socket.read  "></a><strong>Socket:read  </strong>&nbsp;(length)</dt>
 625 <dd>
 626
 627  Receive a message on the socket (This is an alias for recv).
 628  See the recvfrom description for more details.
 629
 630
 631 <h3>Parameters</h3>
 632 <ul>
 633
 634         <li>
 635           length: Amount of data to read (in Bytes).
 636         </li>
 637
 638 </ul>
 639
 640
 641
 642
 643
 644
 645 <h3>Return value:</h3>
 646 buffer containing data successfully read
 647
 648
 649
 650 <h3>See also:</h3>
 651 <ul>
 652
 653         <li><a href="#Socket.recvfrom">
 654                 Socket:recvfrom
 655         </a>
 656
 657 </ul>
 658
 659 </dd>
 660
 661
 662
 663
 664 <dt><a name="Socket.recv  "></a><strong>Socket:recv  </strong>&nbsp;(length)</dt>
 665 <dd>
 666
 667  Receive a message on the socket.
 668  This function is identical to recvfrom except that it does not return
 669  the sender's source address. See the recvfrom description for more details.
 670
 671
 672 <h3>Parameters</h3>
 673 <ul>
 674
 675         <li>
 676           length: Amount of data to read (in Bytes).
 677         </li>
 678
 679 </ul>
 680
 681
 682
 683
 684
 685
 686 <h3>Return value:</h3>
 687 buffer containing data successfully read
 688
 689
 690
 691 <h3>See also:</h3>
 692 <ul>
 693
 694         <li><a href="#Socket.recvfrom">
 695                 Socket:recvfrom
 696         </a>
 697
 698 </ul>
 699
 700 </dd>
 701
 702
 703
 704
 705 <dt><a name="Socket.recvfrom"></a><strong>Socket:recvfrom</strong>&nbsp;(length)</dt>
 706 <dd>
 707
 708  Receive a message on the socket including the senders source address.
 709
 710
 711 <h3>Parameters</h3>
 712 <ul>
 713
 714         <li>
 715           length: Amount of data to read (in Bytes).
 716         </li>
 717
 718 </ul>
 719
 720
 721
 722
 723 <h3>Usage</h3>
 724 <ul>
 725
 726         <li><strong>Warning:</strong> It is not guaranteed that all requested data
 727  is read at once.
 728  You have to check the return value - the length of the buffer actually read -
 729  or use the safe IO functions in the high-level IO utility module.
 730
 731         <li>The length of the return buffer is limited by the (compile time)
 732  nixio buffersize which is <em>nixio.const.buffersize</em> (8192 by default).
 733  Any read request greater than that will be safely truncated to this value.
 734
 735 </ul>
 736
 737
 738
 739 <h3>Return values:</h3>
 740 <ol>
 741
 742         <li>buffer containing data successfully read
 743
 744         <li>host                IP-Address of the sender
 745
 746         <li>port                Port of the sender
 747
 748 </ol>
 749
 750
 751
 752 </dd>
 753
 754
 755
 756
 757 <dt><a name="Socket.send"></a><strong>Socket:send</strong>&nbsp;(buffer, offset, length)</dt>
 758 <dd>
 759
 760  Send a message on the socket.
 761  This function is identical to sendto except for the missing destination
 762  parameters. See the sendto description for a detailed description.
 763
 764
 765 <h3>Parameters</h3>
 766 <ul>
 767
 768         <li>
 769           buffer: Buffer holding the data to be written.
 770         </li>
 771
 772         <li>
 773           offset: Offset to start reading the buffer from. (optional)
 774         </li>
 775
 776         <li>
 777           length: Length of chunk to read from the buffer. (optional)
 778         </li>
 779
 780 </ul>
 781
 782
 783
 784
 785
 786
 787 <h3>Return value:</h3>
 788 number of bytes written
 789
 790
 791
 792 <h3>See also:</h3>
 793 <ul>
 794
 795         <li><a href="#Socket.sendto">
 796                 Socket:sendto
 797         </a>
 798
 799 </ul>
 800
 801 </dd>
 802
 803
 804
 805
 806 <dt><a name="Socket.sendto"></a><strong>Socket:sendto</strong>&nbsp;(buffer, host, port, offset, length)</dt>
 807 <dd>
 808
 809  Send a message on the socket specifying the destination.
 810
 811
 812 <h3>Parameters</h3>
 813 <ul>
 814
 815         <li>
 816           buffer: Buffer holding the data to be written.
 817         </li>
 818
 819         <li>
 820           host: Target IP-Address
 821         </li>
 822
 823         <li>
 824           port: Target Port
 825         </li>
 826
 827         <li>
 828           offset: Offset to start reading the buffer from. (optional)
 829         </li>
 830
 831         <li>
 832           length: Length of chunk to read from the buffer. (optional)
 833         </li>
 834
 835 </ul>
 836
 837
 838
 839
 840 <h3>Usage</h3>
 841 <ul>
 842
 843         <li><strong>Warning:</strong> It is not guaranteed that all data
 844  in the buffer is written at once.
 845  You have to check the return value - the number of bytes actually written -
 846  or use the safe IO functions in the high-level IO utility module.
 847
 848         <li>Unlike standard Lua indexing the lowest offset and default is 0.
 849
 850 </ul>
 851
 852
 853
 854 <h3>Return value:</h3>
 855 number of bytes written
 856
 857
 858
 859 </dd>
 860
 861
 862
 863
 864 <dt><a name="Socket.setblocking"></a><strong>Socket:setblocking</strong>&nbsp;(blocking)</dt>
 865 <dd>
 866
 867  Set the blocking mode of the socket.
 868
 869
 870 <h3>Parameters</h3>
 871 <ul>
 872
 873         <li>
 874           blocking: (boolean)
 875         </li>
 876
 877 </ul>
 878
 879
 880
 881
 882
 883
 884 <h3>Return value:</h3>
 885 true
 886
 887
 888
 889 </dd>
 890
 891
 892
 893
 894 <dt><a name="Socket.setopt"></a><strong>Socket:setopt</strong>&nbsp;(level, option, value)</dt>
 895 <dd>
 896
 897  Set a socket option.
 898
 899
 900 <h3>Parameters</h3>
 901 <ul>
 902
 903         <li>
 904           level: Level ["socket", "tcp", "ip", "ipv6"]
 905         </li>
 906
 907         <li>
 908           option: Option        ["keepalive", "reuseaddr", "sndbuf", "rcvbuf",
 909  "priority", "broadcast", "linger", "sndtimeo", "rcvtimeo", "dontroute",
 910  "bindtodevice", "error", "oobinline", "cork" (TCP),  "nodelay" (TCP),
 911  "mtu" (IP, IPv6), "hdrincl" (IP), "multicast_ttl" (IP), "multicast_loop"
 912  (IP, IPv6), "multicast_if" (IP, IPv6), "v6only" (IPv6), "multicast_hops"
 913  (IPv6), "add_membership" (IP, IPv6), "drop_membership" (IP, IPv6)]
 914         </li>
 915
 916         <li>
 917           value: Value
 918         </li>
 919
 920 </ul>
 921
 922
 923
 924
 925
 926
 927 <h3>Return value:</h3>
 928 true
 929
 930
 931
 932 </dd>
 933
 934
 935
 936
 937 <dt><a name="Socket.shutdown"></a><strong>Socket:shutdown</strong>&nbsp;(how)</dt>
 938 <dd>
 939
 940  Shut down part of a full-duplex connection.
 941
 942
 943 <h3>Parameters</h3>
 944 <ul>
 945
 946         <li>
 947           how: (optional, default: rdwr) ["rdwr", "rd", "wr"]
 948         </li>
 949
 950 </ul>
 951
 952
 953
 954
 955
 956
 957 <h3>Return value:</h3>
 958 true
 959
 960
 961
 962 </dd>
 963
 964
 965
 966
 967 <dt><a name="Socket.write"></a><strong>Socket:write</strong>&nbsp;(buffer, offset, length)</dt>
 968 <dd>
 969
 970  Send a message on the socket (This is an alias for send).
 971  See the sendto description for a detailed description.
 972
 973
 974 <h3>Parameters</h3>
 975 <ul>
 976
 977         <li>
 978           buffer: Buffer holding the data to be written.
 979         </li>
 980
 981         <li>
 982           offset: Offset to start reading the buffer from. (optional)
 983         </li>
 984
 985         <li>
 986           length: Length of chunk to read from the buffer. (optional)
 987         </li>
 988
 989 </ul>
 990
 991
 992
 993
 994
 995
 996 <h3>Return value:</h3>
 997 number of bytes written
 998
 999
1000
1001 <h3>See also:</h3>
1002 <ul>
1003
1004         <li><a href="#Socket.sendto">
1005                 Socket:sendto
1006         </a>
1007
1008 </ul>
1009
1010 </dd>
1011
1012
1013 </dl>
1014
1015
1016
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