htonl, htons, ntohl, ntohs - convert values between host and network byte order
Standard C library (
libc,
-lc)
#include <arpa/inet.h>
uint32_t htonl(uint32_t hostlong);
uint16_t htons(uint16_t hostshort);
uint32_t ntohl(uint32_t netlong);
uint16_t ntohs(uint16_t netshort);
The
htonl() function converts the unsigned integer
hostlong from
host byte order to network byte order.
The
htons() function converts the unsigned short integer
hostshort
from host byte order to network byte order.
The
ntohl() function converts the unsigned integer
netlong from
network byte order to host byte order.
The
ntohs() function converts the unsigned short integer
netshort
from network byte order to host byte order.
On the i386 the host byte order is Least Significant Byte first, whereas the
network byte order, as used on the Internet, is Most Significant Byte first.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
htonl (), htons (), ntohl (), ntohs () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008.
bswap(3),
endian(3),
gethostbyname(3),
getservent(3)