2012-11-15 12:06:41 +01:00
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.\" $NetBSD: byteorder.3,v 1.15 2011/05/03 04:07:39 jruoho Exp $
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2011-02-14 20:36:03 +01:00
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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. 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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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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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2012-11-15 12:06:41 +01:00
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.Dd May 3, 2011
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2011-02-14 20:36:03 +01:00
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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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.In arpa/inet.h
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.Ft uint32_t
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.Fn htonl "uint32_t host32"
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.Ft uint16_t
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.Fn htons "uint16_t host16"
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.Ft uint32_t
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.Fn ntohl "uint32_t net32"
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.Ft uint16_t
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.Fn ntohs "uint16_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.
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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, these routines are defined as macros that expand to the value of
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their argument.
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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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2012-11-15 12:06:41 +01:00
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.Xr bswap 3 ,
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.Xr gethostbyname 3 ,
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.Xr getservent 3
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.Sh STANDARDS
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2012-11-15 12:06:41 +01:00
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The described functions conform to
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.St -p1003.1-2001 .
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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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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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