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Man Pages


Manual Reference Pages  -  HTONL (3)

NAME

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

CONTENTS

Library
Synopsis
Description
See Also
Standards
History
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In arpa/inet.h

or


.In netinet/in.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

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, routines are defined as null macros.

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

SEE ALSO

gethostbyname(3), getservent(3), byteorder(9)

STANDARDS

The byteorder functions conform to -p1003.1-2001.

HISTORY

The byteorder functions appeared in BSD 4.2 .

BUGS

On the VAX bytes are handled backwards from most everyone else in the world. This is not expected to be fixed in the near future.
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