Copyright (c) 1983 The Regents of the University of California.
All rights reserved.

%sccs.include.redist.man%

@(#)byteorder.3 6.6 (Berkeley) 02/21/91

C 5 htonl, htons, ntohl, ntohs - convert values between host and network byte order

 #include <sys/param.h> 

 netlong = htonl(hostlong);  u_long netlong, hostlong; 

 netshort = htons(hostshort);  u_short netshort, hostshort; 

 hostlong = ntohl(netlong);  u_long hostlong, netlong; 

 hostshort = ntohs(netshort);  u_short hostshort, netshort; 

These routines convert 16 and 32 bit quantities between network byte order and host byte order. On machines which have a byte order which is the same as the network order, routines are defined as null macros.

These routines are most often used in conjunction with Internet addresses and ports as returned by gethostbyname (3) and getservent (3).

gethostbyname(3), getservent(3) The VAX handles bytes backwards from most everyone else in the world. This is not expected to be fixed in the near future.