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inet(3N)							      inet(3N)

NAME
       inet:   inet_addr(),   inet_lnaof(),   inet_makeaddr(),	 inet_netof(),
       inet_network(), inet_ntoa(), inet_ntoa_r() - Internet address manipula‐
       tion routines

SYNOPSIS
   Remarks
       The routine is described in the section below.

DESCRIPTION
       Interpret character strings representing numbers
			   expressed in the Internet standard "dot" notation.

			   returns   numbers  suitable	for  use  as  Internet
			   addresses.

			   returns numbers suitable for use as	Internet  net‐
			   work numbers.

			   Return  values  can be assigned to a (defined in by
			   using a technique similar to the following:

       Take an Internet address and return an
			   ASCII string representing the address in dot	 nota‐
			   tion.

       Take an Internet network number and a local network address
			   and construct an Internet address from it.

       Break apart Internet host addresses,
			   returning the network number part.

       Break apart Internet host addresses,
			   returning the local network address part.

       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.  Bytes in HP-UX systems are
       ordered from left to right.

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

       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 right-most two bytes of the network
       address.	 This makes the three-part address format convenient for spec‐
       ifying Class B network addresses, as in

       When  a two-part address is supplied, the last part is interpreted as a
       24-bit quantity and placed in the right-most three bytes of the network
       address.	  This makes the two-part address format convenient for speci‐
       fying Class A network addresses as in

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

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

       In a multithreaded application, uses thread-specific  storage  that  is
       re-used	in  each call.	The return value, the character string, should
       be unique for each thread and should be saved, if desired,  before  the
       thread makes the next call.

   Obsolescent Interfaces
       The following reentrant interface has been moved from to

       It is included to support existing applications and may be removed in a
       future release.	New multithreaded applications should use the  regular
       API (those without the suffix.)

       The  reentrant  interface  functions  the same as the regular interface
       without the suffix.  However, expects to be passed  the	address	 of  a
       character  buffer  and  will store the result at the supplied location.
       If the buffer is of insufficient length, is returned.  If the operation
       is  successful, the length of the result string (not including the ter‐
       minating null character) is returned.

RETURN VALUE
       The routines return values as described in the section.	and return for
       malformed requests.

WARNINGS
       The return value from the function cannot distinguish between a failure
       (and a local broadcast address (255.255.255.255).  This can be  handled
       by using the function instead of the function.

AUTHOR
       The routines were developed by the University of California, Berkeley.

SEE ALSO
       gethostent(3N),	 getnetent(3N),	  inet6(3N),   hosts(4),  networks(4),
       thread_safety(5).

								      inet(3N)
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