htonl(3n) bsd man page | unix.com

BYTEORDER(3N)															     BYTEORDER(3N)

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

SYNOPSIS
       #include <sys/types.h>
       #include <netinet/in.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;

DESCRIPTION
       These routines convert 16 and 32 bit quantities between network byte order and host byte order.	On machines such as the SUN these routines
       are defined as null macros in the include file <netinet/in.h>.

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

SEE ALSO
       gethostbyname(3N), getservent(3N)

BUGS
       The VAX handles bytes backwards from most everyone else in the world.  This is not expected to be fixed in the near future.

4.2 Berkeley Distribution					   May 15, 1986 						     BYTEORDER(3N)