inet(3n)                   DG/UX 4.30                    inet(3n)



     NAME
          inet_addr, inet_network, inet_ntoa, inet_makeaddr,
          inet_lnaof, inet_netof - Internet address manipulation
          routines

     SYNOPSIS
          #include <sys/types.h>
          #include <netinet/in.h>
          #include <arpa/inet.h>

          struct inaddr inetaddr(cp)
          char *cp;

          unsigned long inetnetwork(cp)
          char *cp;

          char *inetntoa(in)
          struct inaddr in;

          struct inaddr inetmakeaddr(net, lna)
          int net, lna;

          int inetlnaof(in)
          struct inaddr in;

          int inetnetof(in)
          struct inaddr in;

     DESCRIPTION
          inetaddr, inetnetwork
                    Interpret character strings representing numbers
                    expressed in the Internet standard dot notation,
                    returning numbers suitable for use as Internet
                    addresses and Internet network numbers,
                    respectively.

          inetntoa Takes an Internet address and returns an ASCII
                    string representing the address in dot notation.

          inetmakeaddr
                    Takes an Internet network number and a local
                    network address, and constructs an Internet
                    address from it.

          inetnetof, inetlnaof
                    Break apart Internet host addresses, returning the
                    network number and local network address part,
                    respectively.

          All Internet addresses are returned in network order (bytes
          ordered from left to right).  All network numbers and local
          address parts are returned as machine-format integer values.



     Licensed material--property of copyright holder(s)         Page 1

     inet(3n)                   DG/UX 4.30                    inet(3n)



     INTERNET ADDRESSES
          Values specified using the dot notation take one of the
          following forms:

             a.b.c.d
             a.b.c
             a.b
             a

          When four parts are specified, each is interpreted as a byte
          of data and assigned, from left to right, to the four bytes
          of an Internet address.

          When a three-part address is specified, the last part is
          interpreted as a 16-bit quantity and placed in the rightmost
          two bytes of the network address.  This makes the three-part
          address format convenient for specifying Class B network
          addresses as 128.net.host.

          When a two-part address is supplied, the last part is
          interpreted as a 24-bit quantity and placed in the rightmost
          three bytes of the network address.  This makes the two-part
          address format convenient for specifying Class A network
          addresses as net.host.

          When only one part is given, the value is stored directly in
          the network address without any byte rearrangement.

          All numbers supplied as parts in a dot notation may be
          decimal, octal, or hexadecimal, as specified in the C
          language (i.e., a leading 0x or 0X implies hexadecimal;
          otherwise, a leading 0 implies octal; otherwise, the number
          is interpreted as decimal).

     SEE ALSO
          gethostent(3N), getnetent(3N), hosts(4), networks(4)

     DIAGNOSTICS
          Inetaddr and inetnetwork return the value -1 for malformed
          requests.

     BUGS
          The problem of host byte ordering versus network byte
          ordering is confusing.  There is no simple way to specify
          Class C network addresses, as there is for Classes A and B.
          The string returned by inetntoa resides in a static memory
          area.








     Licensed material--property of copyright holder(s)         Page 2