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Annotation of 43BSDTahoe/man/man3/inet.3, 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: .\"    @(#)inet.3      6.6 (Berkeley) 10/1/87
        !             6: .\"
        !             7: .TH INET 3N "October 1, 1987"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof \- Internet address manipulation routines
        !            11: .SH SYNOPSIS
        !            12: .nf
        !            13: .B "#include <sys/socket.h>
        !            14: .B "#include <netinet/in.h>
        !            15: .B "#include <arpa/inet.h>
        !            16: .PP
        !            17: .B "unsigned long inet_addr(cp)
        !            18: .B "char *cp;
        !            19: .PP
        !            20: .B "unsigned long inet_network(cp)
        !            21: .B "char *cp;
        !            22: .PP
        !            23: .B "char *inet_ntoa(in)
        !            24: .B "struct in_addr in;
        !            25: .PP
        !            26: .B "struct in_addr inet_makeaddr(net, lna)
        !            27: .B "int net, lna;
        !            28: .PP
        !            29: .B "unsigned long inet_lnaof(in)
        !            30: .B "struct in_addr in;
        !            31: .PP
        !            32: .B "unsigned long inet_netof(in)
        !            33: .B "struct in_addr in;
        !            34: .fi
        !            35: .SH DESCRIPTION
        !            36: The routines
        !            37: .I inet_addr
        !            38: and
        !            39: .I inet_network
        !            40: each interpret character strings representing
        !            41: numbers expressed in the Internet standard \*(lq.\*(rq
        !            42: notation, returning numbers suitable for use
        !            43: as Internet addresses and Internet network
        !            44: numbers, respectively.  The routine
        !            45: .I inet_ntoa
        !            46: takes an Internet address and returns an ASCII
        !            47: string representing the address in \*(lq.\*(rq
        !            48: notation.  The routine
        !            49: .I inet_makeaddr
        !            50: takes an Internet network number and a local
        !            51: network address and constructs an Internet address
        !            52: from it.  The routines
        !            53: .I inet_netof
        !            54: and
        !            55: .I inet_lnaof
        !            56: break apart Internet host addresses, returning
        !            57: the network number and local network address part,
        !            58: respectively.
        !            59: .PP
        !            60: All Internet address are returned in network
        !            61: order (bytes ordered from left to right).
        !            62: All network numbers and local address parts are
        !            63: returned as machine format integer values.
        !            64: .SH "INTERNET ADDRESSES"
        !            65: Values specified using the \*(lq.\*(rq notation take one
        !            66: of the following forms:
        !            67: .RS
        !            68: .nf
        !            69: a.b.c.d
        !            70: a.b.c
        !            71: a.b
        !            72: a
        !            73: .RE
        !            74: .fi
        !            75: When four parts are specified, each is interpreted
        !            76: as a byte of data and assigned, from left to right,
        !            77: to the four bytes of an Internet address.  Note
        !            78: that when an Internet address is viewed as a 32-bit
        !            79: integer quantity on the VAX the bytes referred to
        !            80: above appear as \*(lqd.c.b.a\*(rq.  That is, VAX bytes are
        !            81: ordered from right to left.
        !            82: .PP
        !            83: When a three part address is specified, the last
        !            84: part is interpreted as a 16-bit quantity and placed
        !            85: in the right most two bytes of the network address.
        !            86: This makes the three part address format convenient
        !            87: for specifying Class B network addresses as
        !            88: \*(lq128.net.host\*(rq.
        !            89: .PP
        !            90: When a two part address is supplied, the last part
        !            91: is interpreted as a 24-bit quantity and placed in
        !            92: the right most three bytes of the network address.
        !            93: This makes the two part address format convenient
        !            94: for specifying Class A network addresses as
        !            95: \*(lqnet.host\*(rq.
        !            96: .PP
        !            97: When only one part is given, the value is stored
        !            98: directly in the network address without any byte
        !            99: rearrangement.
        !           100: .PP
        !           101: All numbers supplied as \*(lqparts\*(rq in a \*(lq.\*(rq notation
        !           102: may be decimal, octal, or hexadecimal, as specified
        !           103: in the C language (i.e., a leading 0x or 0X implies
        !           104: hexadecimal; otherwise, a leading 0 implies octal;
        !           105: otherwise, the number is interpreted as decimal).
        !           106: .SH "SEE ALSO"
        !           107: gethostbyname(3N), getnetent(3N), hosts(5), networks(5),
        !           108: .SH DIAGNOSTICS
        !           109: The constant \fBINADDR_NONE\fP is returned by
        !           110: .I inet_addr
        !           111: and
        !           112: .I inet_network
        !           113: for malformed requests.
        !           114: .SH BUGS
        !           115: The problem of host byte ordering versus network byte ordering is
        !           116: confusing.  A simple way to specify Class C network addresses in a manner
        !           117: similar to that for Class B and Class A is needed.
        !           118: The string returned by
        !           119: .I inet_ntoa
        !           120: resides in a static memory area.
        !           121: .br
        !           122: Inet_addr should return a struct in_addr.

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