INET(3)             Linux Programmer's Manual             INET(3)


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

SYNOPSIS
       #include (lt)sys/socket.h(gt)
       #include (lt)netinet/in.h(gt)
       #include (lt)arpa/inet.h(gt)

       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 network 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       described immediately above; it is obsolete because -1  is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
       network 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 subse-
       quent 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



BSD                     September 3, 1995                       1





INET(3)             Linux Programmer's Manual             INET(3)


       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 Sig-
       nificant 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), networks(5)

































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