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FreeBSD/Linux Kernel Cross Reference
sys/net/byteorder.3

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    1 .\" 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 .\" 4. Neither the name of the University nor the names of its contributors
   13 .\"    may be used to endorse or promote products derived from this software
   14 .\"    without specific prior written permission.
   15 .\"
   16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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   21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26 .\" SUCH DAMAGE.
   27 .\"
   28 .\"     @(#)byteorder.3 8.1 (Berkeley) 6/4/93
   29 .\" $FreeBSD: head/lib/libc/net/byteorder.3 165903 2007-01-09 00:28:16Z imp $
   30 .\"
   31 .Dd March 20, 2005
   32 .Dt BYTEORDER 3
   33 .Os
   34 .Sh NAME
   35 .Nm htonl ,
   36 .Nm htons ,
   37 .Nm ntohl ,
   38 .Nm ntohs
   39 .Nd convert values between host and network byte order
   40 .Sh LIBRARY
   41 .Lb libc
   42 .Sh SYNOPSIS
   43 .In arpa/inet.h
   44 .Pp
   45 or
   46 .Pp
   47 .In netinet/in.h
   48 .Ft uint32_t
   49 .Fn htonl "uint32_t hostlong"
   50 .Ft uint16_t
   51 .Fn htons "uint16_t hostshort"
   52 .Ft uint32_t
   53 .Fn ntohl "uint32_t netlong"
   54 .Ft uint16_t
   55 .Fn ntohs "uint16_t netshort"
   56 .Sh DESCRIPTION
   57 These routines convert 16 and 32 bit quantities between network
   58 byte order and host byte order.
   59 On machines which have a byte order which is the same as the network
   60 order, routines are defined as null macros.
   61 .Pp
   62 These routines are most often used in conjunction with Internet
   63 addresses and ports as returned by
   64 .Xr gethostbyname 3
   65 and
   66 .Xr getservent 3 .
   67 .Sh SEE ALSO
   68 .Xr gethostbyname 3 ,
   69 .Xr getservent 3 ,
   70 .Xr byteorder 9
   71 .Sh STANDARDS
   72 The
   73 .Nm byteorder
   74 functions conform to
   75 .St -p1003.1-2001 .
   76 .Sh HISTORY
   77 The
   78 .Nm byteorder
   79 functions appeared in
   80 .Bx 4.2 .
   81 .Sh BUGS
   82 On the
   83 .Tn VAX
   84 bytes are handled backwards from most everyone else in
   85 the world.
   86 This is not expected to be fixed in the near future.

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