NAME
htonl, htons,
ntohl, ntohs —
convert values between host and network
byte order
LIBRARY
library “libc”
SYNOPSIS
#include
<arpa/inet.h>
uint32_t
htonl(uint32_t
host32);
uint16_t
htons(uint16_t
host16);
uint32_t
ntohl(uint32_t
net32);
uint16_t
ntohs(uint16_t
net16);
DESCRIPTION
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, these routines are defined as macros that expand to the value of their argument.
These routines are most often used in conjunction with Internet addresses and ports as returned by gethostbyname(3) and getservent(3).
SEE ALSO
STANDARDS
The described functions conform to IEEE Std 1003.1-2001 (“POSIX.1”).
HISTORY
The byteorder functions appeared in
4.2BSD.
BUGS
The `l' and `s' suffixes in the names are not meaningful in machines where long integers are not 32 bits.