NAME

byteorder, htonl, htonll, htons, ntohl, ntohll, ntohs — convert values between host and network byte order

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/types.h>
#include <netinet/in.h>
#include <inttypes.h>

uint32_t
htonl(uint32_t hostlong);

uint64_t
htonll(uint64_t hostlonglong);

uint16_t
htons(uint16_t hostshort);

uint32_t
ntohl(uint32_t netlong);

uint64_t
ntohll(uint64_t netlonglong);

uint16_t
ntohs(uint16_t netshort);

DESCRIPTION

These functions convert 16-bit, 32-bit, and 64-bit quantities between network byte order and host byte order. On some architectures these routines are defined as NULL macros in the include file <netinet/in.h>. On other architectures, the routines are functional when the host byte order is different from network byte order.

These functions are most often used in conjunction with Internet addresses and ports as returned by gethostent(3NSL) and getservent(3SOCKET).

MT-LEVEL

Safe

SEE ALSO

inet.h(3HEAD), gethostent(3NSL), getservent(3SOCKET), attributes(7), byteorder(7)