inet_addr(3XNET)				   X/Open Networking Services Library Functions 				  inet_addr(3XNET)

NAME

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

SYNOPSIS

       cc [ flag ... ] file ... -lxnet [ library ... ]
       #include <arpa/inet.h>

       in_addr_t inet_addr(const char *cp);

       in_addr_t inet_lnaof(struct in_addr in);

       struct in_addr inet_makeaddr(in_addr_t net, in_addr_t lna);

       in_addr_t inet_netof(struct in_addr in);

       in_addr_t inet_network(const char *cp);

       char *inet_ntoa(struct in_addr in);

DESCRIPTION

       The  inet_addr() function converts the string pointed to by cp, in the Internet standard dot notation, to an integer value suitable for use
       as an Internet address.

       The inet_lnaof() function takes an Internet host address specified by in and extracts the local network address part, in host byte order.

       The inet_makeaddr() function takes the Internet network number specified by net and the local network address specified	by  lna,  both	in
       host byte order, and constructs an Internet address from them.

       The inet_netof() function takes an Internet host address specified by in and extracts the network number part, in host byte order.

       The  inet_network()  function converts the string pointed to by cp, in the Internet standard dot notation, to an integer value suitable for
       use as an Internet network number.

       The inet_ntoa() function converts the Internet host address specified by in to a string in the Internet standard dot notation.

       All Internet addresses are returned in network order (bytes ordered from left to right).

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

       a.b.c.d	  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.

       a.b.c	  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.

       a.b	  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.

       a	  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 dot notation may be decimal, octal, or hexadecimal, that is, a leading 0x or 0X  implies  hexadecimal,	as
       specified in the ISO C standard; otherwise, a leading 0 implies octal; otherwise, the number is interpreted as decimal.

USAGE

       The return value of inet_ntoa() may point to static data that may be overwritten by subsequent calls to inet_ntoa().

RETURN VALUES

       Upon successful completion, inet_addr() returns the Internet address. Otherwise, it returns (in_addr_t)(-1).

       Upon successful completion, inet_network() returns the converted Internet network number. Otherwise, it returns (in_addr_t)(-1).

       The inet_makeaddr() function returns the constructed Internet address.

       The inet_lnaof() function returns the local network address part.

       The inet_netof() function returns the network number.

       The inet_ntoa() function returns a pointer to the network address in Internet-standard dot notation.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       endhostent(3XNET), endnetent(3XNET), attributes(5), standards(5)

SunOS 5.11							    10 Jun 2002 						  inet_addr(3XNET)