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Annotation of researchv10dc/man/man3/internet.3, revision 1.1

1.1     ! root        1: .TH INTERNET 3X
        !             2: .CT 2 comm_mach
        !             3: .SH NAME
        !             4: in_host, in_ntoa, in_address, in_service \- internet networking functions
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .B #include <sys/inet/in.h>
        !             8: .PP
        !             9: .B char *in_host(hostaddr)
        !            10: .B in_addr hostaddr;
        !            11: .PP
        !            12: .B char *in_ntoa(hostaddr)
        !            13: .B in_addr hostaddr;
        !            14: .PP
        !            15: .B in_addr in_address(hostname)
        !            16: .B char *hostname;
        !            17: .PP
        !            18: .B struct in_service *in_service(name, proto, port)
        !            19: .B char *name, *proto;
        !            20: .B unsigned long port;
        !            21: .fi
        !            22: .PP
        !            23: .SH DESCRIPTION
        !            24: These routines are loaded by the
        !            25: .B -lin
        !            26: option of
        !            27: .IR ld (1).
        !            28: .PP
        !            29: Internet addresses, type
        !            30: .I in_addr,
        !            31: are 32-bit quantities global to the network.
        !            32: The
        !            33: .SM ASCII
        !            34: representation of an
        !            35: .I in_addr
        !            36: can be either a host name or of the form
        !            37: .I b1.b2.b3.b4,
        !            38: where each
        !            39: .I `bx'
        !            40: is the value of the
        !            41: .IR x 'th
        !            42: byte of the
        !            43: address in decimal.
        !            44: Since host names are considered local `aliases' for internet
        !            45: addresses, the host-to-address mapping is subjective.
        !            46: .PP
        !            47: .I In_address
        !            48: maps an internet host name to an address
        !            49: and returns 0
        !            50: if the name is not found in the host
        !            51: table.
        !            52: .PP
        !            53: .I In_host
        !            54: maps an internet address into a host name.
        !            55: If the host is not found in the host table, the
        !            56: .SM ASCII
        !            57: representation of the address is returned.
        !            58: .PP
        !            59: .I In_ntoa
        !            60: maps an internet address to its
        !            61: .SM ASCII
        !            62: numeric format.
        !            63: .PP
        !            64: .I In_service
        !            65: returns the closest match to
        !            66: .I name
        !            67: in the services file.
        !            68: If either
        !            69: .I name
        !            70: or
        !            71: .I port
        !            72: are 0,
        !            73: they will match any name or port.
        !            74: If
        !            75: .I proto
        !            76: is
        !            77: .BR "(char *)0" ,
        !            78: the
        !            79: .B tcp
        !            80: protocol is assumed.
        !            81: .SH FILES
        !            82: .nf
        !            83: .ta 32n
        !            84: \fL/usr/inet/lib/hosts\fP      mapping between host names and addresses
        !            85: \fL/usr/inet/lib/networks\fP   mapping between network names and addresses
        !            86: \fL/usr/inet/lib/services\fP   database of services
        !            87: \fL/usr/inet/lib/hosts.equiv\fP        machines with common administration
        !            88: .fi
        !            89: .SH SEE ALSO
        !            90: .IR ipc (3),
        !            91: .IR tcp (3), 
        !            92: .IR udp (3)
        !            93: .SH BUGS
        !            94: .PP
        !            95: The mappings between internet addresses and names is arbitrary at best.
        !            96: The hosts file may contain many addresses for each name and/or many
        !            97: names for each address.
        !            98: .I In_address
        !            99: and
        !           100: .I in_host
        !           101: each start at the beginning of the file and search sequentially for a match.
        !           102: Therefore,
        !           103: .B "in_addr(in_host(addr)) \=\= addr"
        !           104: is not necessarily true.

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