HTON(3) 						     Library Functions Manual							   HTON(3)

NAME

       hton, htons, htonl, ntohs, ntohl - host to network byte order conversion

SYNOPSIS

       #define _MINIX_SOURCE 1
       #include <stddef.h>
       #include <sys/types.h>

       #include <net/hton.h>

       u16_t htons(u16_t host_word)
       u32_t htonl(u32_t host_dword)
       u16_t ntohs(u16_t network_word)
       u32_t ntohl(u32_t network_dword)
       u16_t HTONS(u16_t host_word)
       u32_t HTONL(u32_t host_dword)
       u16_t NTOHS(u16_t network_word)
       u32_t NTOHL(u32_t network_dword)

DESCRIPTION

       These  macros  convert  16-bit  and 32-bit quantities to and from the network byte order used by the TCP/IP protocols.  The function of the
       macros is encoded in their name.  H means host byte order, n means network byte order, s means a 16-bit quantity and l means a 32-bit quan-
       tity.   Thus  htons converts a 16-bit quantity from host byte order to network byte order.  The difference between the lower case and upper
       case variants is that the lower case variants evaluate the argument at most once and the upper case variants can be used for constant fold-
       ing.  That is,

	      htonl(f(x))

       will call f(x) at most once and

	      HTONS(0x10)

       will be equivalent to 0x10 on a big-endian machine and 0x1000 on a little-endian machine.

SEE ALSO

       ip(4).

AUTHOR

       Philip Homburg (philip@cs.vu.nl)

																	   HTON(3)