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Annotation of 43BSDReno/share/man/man4/udp.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"    @(#)udp.4       6.4 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH UDP 4 "June 23, 1990"
        !            21: .UC 5
        !            22: .SH NAME
        !            23: udp \- Internet User Datagram Protocol
        !            24: .SH SYNOPSIS
        !            25: .B #include <sys/socket.h>
        !            26: .br
        !            27: .B #include <netinet/in.h>
        !            28: .PP
        !            29: .B s = socket(AF_INET, SOCK_DGRAM, 0);
        !            30: .SH DESCRIPTION
        !            31: UDP is a simple, unreliable datagram protocol which is used
        !            32: to support the SOCK_DGRAM abstraction for the Internet
        !            33: protocol family.  UDP sockets are connectionless, and are
        !            34: normally used with the
        !            35: .I sendto 
        !            36: and
        !            37: .IR recvfrom 
        !            38: calls, though the
        !            39: .IR connect (2)
        !            40: call may also be used to fix the destination for future
        !            41: packets (in which case the 
        !            42: .IR recv (2)
        !            43: or
        !            44: .IR read (2)
        !            45: and 
        !            46: .IR send (2)
        !            47: or
        !            48: .IR write(2)
        !            49: system calls may be used).
        !            50: .PP
        !            51: UDP address formats are identical to those used by
        !            52: TCP. In particular UDP provides a port identifier in addition
        !            53: to the normal Internet address format.  Note that the UDP port
        !            54: space is separate from the TCP port space (i.e. a UDP port
        !            55: may not be \*(lqconnected\*(rq to a TCP port).  In addition broadcast
        !            56: packets may be sent (assuming the underlying network supports
        !            57: this) by using a reserved \*(lqbroadcast address\*(rq; this address
        !            58: is network interface dependent.
        !            59: .PP
        !            60: Options at the IP transport level may be used with UDP; see
        !            61: .IR ip (4).
        !            62: .SH DIAGNOSTICS
        !            63: A socket operation may fail with one of the following errors returned:
        !            64: .TP 15
        !            65: [EISCONN]
        !            66: when trying to establish a connection on a socket which
        !            67: already has one, or when trying to send a datagram with the destination
        !            68: address specified and the socket is already connected;
        !            69: .TP 15
        !            70: [ENOTCONN]
        !            71: when trying to send a datagram, but
        !            72: no destination address is specified, and the socket hasn't been
        !            73: connected;
        !            74: .TP 15
        !            75: [ENOBUFS]
        !            76: when the system runs out of memory for
        !            77: an internal data structure;
        !            78: .TP 15
        !            79: [EADDRINUSE]
        !            80: when an attempt
        !            81: is made to create a socket with a port which has already been
        !            82: allocated;
        !            83: .TP 15
        !            84: [EADDRNOTAVAIL]
        !            85: when an attempt is made to create a 
        !            86: socket with a network address for which no network interface
        !            87: exists.
        !            88: .SH SEE ALSO
        !            89: getsockopt(2), recv(2), send(2), socket(2), intro(4), inet(4), ip(4)

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