90 lines
3.0 KiB
Groff
90 lines
3.0 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)byteorder.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd May 11, 2002
|
|
.Dt BYTEORDER 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm htonl ,
|
|
.Nm htons ,
|
|
.Nm ntohl ,
|
|
.Nm ntohs
|
|
.Nd convert values between host and network byte order
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In arpa/inet.h
|
|
.Pp
|
|
or
|
|
.Pp
|
|
.In netinet/in.h
|
|
.Ft uint32_t
|
|
.Fn htonl "uint32_t hostlong"
|
|
.Ft uint16_t
|
|
.Fn htons "uint16_t hostshort"
|
|
.Ft uint32_t
|
|
.Fn ntohl "uint32_t netlong"
|
|
.Ft uint16_t
|
|
.Fn ntohs "uint16_t netshort"
|
|
.Sh 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.
|
|
.Pp
|
|
These routines are most often used in conjunction with Internet
|
|
addresses and ports as returned by
|
|
.Xr gethostbyname 3
|
|
and
|
|
.Xr getservent 3 .
|
|
.Sh SEE ALSO
|
|
.Xr gethostbyname 3 ,
|
|
.Xr getservent 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm byteorder
|
|
functions conform to
|
|
.St -p1003.1-2001 .
|
|
.Sh HISTORY
|
|
The
|
|
.Nm byteorder
|
|
functions appeared in
|
|
.Bx 4.2 .
|
|
.Sh BUGS
|
|
On the
|
|
.Tn VAX
|
|
bytes are handled backwards from most everyone else in
|
|
the world.
|
|
This is not expected to be fixed in the near future.
|