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Annotation of cci/usr/src/man/man4/udp.4p, revision 1.1

1.1     ! root        1: .TH UDP 4P "25 March 1982"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: udp \- Internet User Datagram Protocol
        !             5: .SH SYNOPSIS
        !             6: .B #include <sys/socket.h>
        !             7: .br
        !             8: .B #include <netinet/in.h>
        !             9: .PP
        !            10: .B s = socket(AF_INET, SOCK_DGRAM, 0);
        !            11: .SH DESCRIPTION
        !            12: UDP is a simple, unreliable datagram protocol which is used
        !            13: to support the SOCK_DGRAM abstraction for the Internet
        !            14: protocol family.  UDP sockets are connectionless, and are
        !            15: normally used with the
        !            16: .I sendto 
        !            17: and
        !            18: .IR recvfrom 
        !            19: calls, though the
        !            20: .IR connect (2)
        !            21: call may also be used to fix the destination for future
        !            22: packets (in which case the 
        !            23: .IR recv (2)
        !            24: or
        !            25: .IR read (2)
        !            26: and 
        !            27: .IR send (2)
        !            28: or
        !            29: .IR write(2)
        !            30: system calls may be used).
        !            31: .PP
        !            32: UDP address formats are identical to those used by
        !            33: TCP. In particular UDP provides a port identifier in addition
        !            34: to the normal Internet address format.  Note that the UDP port
        !            35: space is separate from the TCP port space (i.e. a UDP port
        !            36: may not be \*(lqconnected\*(rq to a TCP port).  In addition broadcast
        !            37: packets may be sent (assuming the underlying network supports
        !            38: this) by using a reserved \*(lqbroadcast address\*(rq; this address
        !            39: is network interface dependent.
        !            40: .SH DIAGNOSTICS
        !            41: A socket operation may fail with one of the following errors returned:
        !            42: .TP 15
        !            43: [EISCONN]
        !            44: when trying to establish a connection on a socket which
        !            45: already has one, or when trying to send a datagram with the destination
        !            46: address specified and the socket is already connected;
        !            47: .TP 15
        !            48: [ENOTCONN]
        !            49: when trying to send a datagram, but
        !            50: no destination address is specified, and the socket hasn't been
        !            51: connected;
        !            52: .TP 15
        !            53: [ENOBUFS]
        !            54: when the system runs out of memory for
        !            55: an internal data structure;
        !            56: .TP 15
        !            57: [EADDRINUSE]
        !            58: when an attempt
        !            59: is made to create a socket with a port which has already been
        !            60: allocated;
        !            61: .TP 15
        !            62: [EADDRNOTAVAIL]
        !            63: when an attempt is made to create a 
        !            64: socket with a network address for which no network interface
        !            65: exists.
        !            66: .SH SEE ALSO
        !            67: send(2),
        !            68: recv(2),
        !            69: intro(4N),
        !            70: inet(4F)

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