NAME

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

SYNOPSIS

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

     int inet_aton(const char *cp, struct in_addr *inp));

     unsigned long int inet_addr(const char *cp));

     unsigned long int inet_network(const char *cp));

     char *inet_ntoa(struct in_addr in));

     struct in_addr inet_makeaddr(int net, int host));

     unsigned long int inet_lnaof(struct in_addr in));

     unsigned long int inet_netof(struct in_addr in));

DESCRIPTION

     inet_aton() converts the Internet host address cp  from  the
     standard  numbers-and-dots  notation  into  binary  data and
     stores it in the structure that  inp  points  to.  inet_aton
     returns nonzero if the address is valid, zero if not.

     The inet_addr() function converts the Internet host  address
     cp  from  numbers-and-dots notation into binary data in net-
     work byte order.  If the input is invalid, -1  is  returned.
     This  is  an  obsolete  interface  to  inet_aton,  described
     immediately above; it is obsolete  because  -1  is  a  valid
     address  (255.255.255.255), and inet_aton provides a cleaner
     way to indicate error return.

     The inet_network() function extracts the network  number  in
     host  byte  order  from  the  address cp in numbers-and-dots
     notation.  If the input is invalid, -1 is returned.

     The inet_ntoa() function converts the Internet host  address
     in  given  in  network  byte  order  to a string in standard
     numbers-and-dots notation.  The  string  is  returned  in  a
     statically  allocated  buffer,  which  subsequent calls will
     overwrite.

     The inet_makeaddr() function makes an Internet host  address
     in  network  byte  order by combining the network number net
     with the local address host in network net,  both  in  local
     host byte order.
     The inet_lnaof() function returns  the  local  host  address
     part  of the Internet address in.  The local host address is
     returned in local host byte order.

     The inet_netof() function returns the network number part of
     the  Internet Address in.  The network number is returned in
     local host byte order.

     The   structure   in_addr   as    used    in    inet_ntoa(),
     inet_makeaddr(), inet_lnoaf() and inet_netof() is defined in
     netinet/in.h as:

          struct in_addr {
                  unsigned long int s_addr;
          }

     Note that on the i80x86 the host byte order is Least  Signi-
     ficant  Byte  first, whereas the network byte order, as used
     on the Internet, is Most Significant Byte first.

CONFORMING TO

     BSD 4.3

SEE ALSO

     gethostbyname(3), getnetent(3), hosts(5),