NAME

byteorder, htonl, htons, ntohl, ntohs − convert values between host and network byte order

SYNOPSIS

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

ulong htonl(u_long hostlong);

u_short htons(u_short hostshort);

u_long ntohl(u_long netlong);

u_short ntohs(u_short netshort);

MT-LEVEL

Unsafe

DESCRIPTION

These routines convert 16 and 32 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, if their host byte order is different from network byte order, these routines are functional. 

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

SEE ALSO

gethostbyname(3N), getservbyname(3N)

NOTES

These interfaces are unsafe in multithreaded applications.  Unsafe interfaces should be called only from the main thread. 
 

SunOS 5.2  —  Last change: 22 Jan 1993