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

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)udp.4p      6.2 (Berkeley) 5/16/86
        !             6: .\"
        !             7: .TH UDP 4P "May 16, 1986"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: udp \- Internet User Datagram Protocol
        !            11: .SH SYNOPSIS
        !            12: .B #include <sys/socket.h>
        !            13: .br
        !            14: .B #include <netinet/in.h>
        !            15: .PP
        !            16: .B s = socket(AF_INET, SOCK_DGRAM, 0);
        !            17: .SH DESCRIPTION
        !            18: UDP is a simple, unreliable datagram protocol which is used
        !            19: to support the SOCK_DGRAM abstraction for the Internet
        !            20: protocol family.  UDP sockets are connectionless, and are
        !            21: normally used with the
        !            22: .I sendto 
        !            23: and
        !            24: .IR recvfrom 
        !            25: calls, though the
        !            26: .IR connect (2)
        !            27: call may also be used to fix the destination for future
        !            28: packets (in which case the 
        !            29: .IR recv (2)
        !            30: or
        !            31: .IR read (2)
        !            32: and 
        !            33: .IR send (2)
        !            34: or
        !            35: .IR write(2)
        !            36: system calls may be used).
        !            37: .PP
        !            38: UDP address formats are identical to those used by
        !            39: TCP. In particular UDP provides a port identifier in addition
        !            40: to the normal Internet address format.  Note that the UDP port
        !            41: space is separate from the TCP port space (i.e. a UDP port
        !            42: may not be \*(lqconnected\*(rq to a TCP port).  In addition broadcast
        !            43: packets may be sent (assuming the underlying network supports
        !            44: this) by using a reserved \*(lqbroadcast address\*(rq; this address
        !            45: is network interface dependent.
        !            46: .PP
        !            47: Options at the IP transport level may be used with UDP; see
        !            48: .IR ip (4P).
        !            49: .SH DIAGNOSTICS
        !            50: A socket operation may fail with one of the following errors returned:
        !            51: .TP 15
        !            52: [EISCONN]
        !            53: when trying to establish a connection on a socket which
        !            54: already has one, or when trying to send a datagram with the destination
        !            55: address specified and the socket is already connected;
        !            56: .TP 15
        !            57: [ENOTCONN]
        !            58: when trying to send a datagram, but
        !            59: no destination address is specified, and the socket hasn't been
        !            60: connected;
        !            61: .TP 15
        !            62: [ENOBUFS]
        !            63: when the system runs out of memory for
        !            64: an internal data structure;
        !            65: .TP 15
        !            66: [EADDRINUSE]
        !            67: when an attempt
        !            68: is made to create a socket with a port which has already been
        !            69: allocated;
        !            70: .TP 15
        !            71: [EADDRNOTAVAIL]
        !            72: when an attempt is made to create a 
        !            73: socket with a network address for which no network interface
        !            74: exists.
        !            75: .SH SEE ALSO
        !            76: getsockopt(2), recv(2), send(2), socket(2), intro(4N), inet(4F), ip(4P)

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