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