| 1 |
30 |
unneback |
.\" Copyright (c) 1983, 1991, 1993
|
| 2 |
|
|
.\" The Regents of the University of California. All rights reserved.
|
| 3 |
|
|
.\"
|
| 4 |
|
|
.\" Redistribution and use in source and binary forms, with or without
|
| 5 |
|
|
.\" modification, are permitted provided that the following conditions
|
| 6 |
|
|
.\" are met:
|
| 7 |
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
| 8 |
|
|
.\" notice, this list of conditions and the following disclaimer.
|
| 9 |
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
| 10 |
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
| 11 |
|
|
.\" documentation and/or other materials provided with the distribution.
|
| 12 |
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
| 13 |
|
|
.\" must display the following acknowledgement:
|
| 14 |
|
|
.\" This product includes software developed by the University of
|
| 15 |
|
|
.\" California, Berkeley and its contributors.
|
| 16 |
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
| 17 |
|
|
.\" may be used to endorse or promote products derived from this software
|
| 18 |
|
|
.\" without specific prior written permission.
|
| 19 |
|
|
.\"
|
| 20 |
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
| 21 |
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 22 |
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 23 |
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
| 24 |
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
| 25 |
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
| 26 |
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
| 27 |
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
| 28 |
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
| 29 |
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
| 30 |
|
|
.\" SUCH DAMAGE.
|
| 31 |
|
|
.\"
|
| 32 |
|
|
.\" @(#)byteorder.3 8.1 (Berkeley) 6/4/93
|
| 33 |
|
|
.\" $Id: byteorder.3,v 1.2 2001-09-27 12:01:53 chris Exp $
|
| 34 |
|
|
.\"
|
| 35 |
|
|
.Dd June 4, 1993
|
| 36 |
|
|
.Dt BYTEORDER 3
|
| 37 |
|
|
.Os BSD 4.2
|
| 38 |
|
|
.Sh NAME
|
| 39 |
|
|
.Nm htonl ,
|
| 40 |
|
|
.Nm htons ,
|
| 41 |
|
|
.Nm ntohl ,
|
| 42 |
|
|
.Nm ntohs
|
| 43 |
|
|
.Nd convert values between host and network byte order
|
| 44 |
|
|
.Sh SYNOPSIS
|
| 45 |
|
|
.Fd #include
|
| 46 |
|
|
.Ft u_long
|
| 47 |
|
|
.Fn htonl "u_long hostlong"
|
| 48 |
|
|
.Ft u_short
|
| 49 |
|
|
.Fn htons "u_short hostshort"
|
| 50 |
|
|
.Ft u_long
|
| 51 |
|
|
.Fn ntohl "u_long netlong"
|
| 52 |
|
|
.Ft u_short
|
| 53 |
|
|
.Fn ntohs "u_short netshort"
|
| 54 |
|
|
.Sh DESCRIPTION
|
| 55 |
|
|
These routines convert 16 and 32 bit quantities between network
|
| 56 |
|
|
byte order and host byte order.
|
| 57 |
|
|
On machines which have a byte order which is the same as the network
|
| 58 |
|
|
order, routines are defined as null macros.
|
| 59 |
|
|
.Pp
|
| 60 |
|
|
These routines are most often used in conjunction with Internet
|
| 61 |
|
|
addresses and ports as returned by
|
| 62 |
|
|
.Xr gethostbyname 3
|
| 63 |
|
|
and
|
| 64 |
|
|
.Xr getservent 3 .
|
| 65 |
|
|
.Sh SEE ALSO
|
| 66 |
|
|
.Xr gethostbyname 3 ,
|
| 67 |
|
|
.Xr getservent 3
|
| 68 |
|
|
.Sh HISTORY
|
| 69 |
|
|
The
|
| 70 |
|
|
.Nm byteorder
|
| 71 |
|
|
functions appeared in
|
| 72 |
|
|
.Bx 4.2 .
|
| 73 |
|
|
.Sh BUGS
|
| 74 |
|
|
On the
|
| 75 |
|
|
.Tn VAX
|
| 76 |
|
|
bytes are handled backwards from most everyone else in
|
| 77 |
|
|
the world. This is not expected to be fixed in the near future.
|
