93 lines
3.2 KiB
Groff
93 lines
3.2 KiB
Groff
.\" $NetBSD: byteorder.3,v 1.6 1999/03/22 19:44:49 garbled Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)byteorder.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt BYTEORDER 3
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.Os
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.Sh NAME
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.Nm htonl ,
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.Nm htons ,
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.Nm ntohl ,
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.Nm ntohs
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.Nd convert values between host and network byte order
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Ft in_addr_t
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.Fn htonl "in_addr_t host32"
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.Ft in_port_t
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.Fn htons "in_port_t host16"
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.Ft in_addr_t
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.Fn ntohl "in_addr_t net32"
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.Ft in_port_t
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.Fn ntohs "in_port_t net16"
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.Sh DESCRIPTION
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These routines convert 16 and 32 bit quantities between network
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byte order and host byte order. The types
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.Ft in_addr_t
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and
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.Ft in_port_t
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are defined by X/Open as:
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.Bd -literal -offset indent
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typedef u_int32_t in_addr_t;
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typedef u_int16_t in_port_t;
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.Ed
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.Pp
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On machines which have a byte order which is the same as the network
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order, routines are defined as null macros.
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.Pp
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These routines are most often used in conjunction with Internet
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addresses and ports as returned by
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.Xr gethostbyname 3
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and
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.Xr getservent 3 .
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.Sh SEE ALSO
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.Xr gethostbyname 3 ,
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.Xr getservent 3
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.Sh HISTORY
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The
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.Nm byteorder
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functions appeared in
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.Bx 4.2 .
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.Sh BUGS
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On the
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.Tn VAX
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bytes are handled backwards from most everyone else in
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the world. This is not expected to be fixed in the near future.
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.Pp
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The `l' and `s' suffixes in the names are not meaningful in machines
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where long integers are not 32 bits.
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