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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
25 | .\" References consulted: | |
26 | .\" Linux libc source code | |
27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
28 | .\" 386BSD man pages | |
29 | .\" Modified Sat Jul 24 21:29:05 1993 by Rik Faith (faith@cs.unc.edu) | |
30 | .\" Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aeb@cwi.nl) | |
31 | .\" | |
4b8c67d9 | 32 | .TH BYTEORDER 3 2017-09-15 "GNU" "Linux Programmer's Manual" |
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33 | .SH NAME |
34 | htonl, htons, ntohl, ntohs \- convert values between host and network | |
35 | byte order | |
36 | .SH SYNOPSIS | |
37 | .nf | |
d1a6e6ff | 38 | .B #include <arpa/inet.h> |
68e4db0a | 39 | .PP |
fea681da | 40 | .BI "uint32_t htonl(uint32_t " hostlong ); |
68e4db0a | 41 | .PP |
fea681da | 42 | .BI "uint16_t htons(uint16_t " hostshort ); |
68e4db0a | 43 | .PP |
fea681da | 44 | .BI "uint32_t ntohl(uint32_t " netlong ); |
68e4db0a | 45 | .PP |
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46 | .BI "uint16_t ntohs(uint16_t " netshort ); |
47 | .fi | |
48 | .SH DESCRIPTION | |
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49 | The |
50 | .BR htonl () | |
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51 | function converts the unsigned integer |
52 | .I hostlong | |
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53 | from host byte order to network byte order. |
54 | .PP | |
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55 | The |
56 | .BR htons () | |
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57 | function converts the unsigned short integer |
58 | .I hostshort | |
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59 | from host byte order to network byte order. |
60 | .PP | |
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61 | The |
62 | .BR ntohl () | |
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63 | function converts the unsigned integer |
64 | .I netlong | |
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65 | from network byte order to host byte order. |
66 | .PP | |
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67 | The |
68 | .BR ntohs () | |
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69 | function converts the unsigned short integer |
70 | .I netshort | |
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71 | from network byte order to host byte order. |
72 | .PP | |
34ccb744 | 73 | On the i386 the host byte order is Least Significant Byte first, |
c13182ef | 74 | whereas the network byte order, as used on the Internet, is Most |
fea681da | 75 | Significant Byte first. |
7998494a | 76 | .SH ATTRIBUTES |
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77 | For an explanation of the terms used in this section, see |
78 | .BR attributes (7). | |
79 | .TS | |
80 | allbox; | |
81 | lbw34 lb lb | |
82 | l l l. | |
83 | Interface Attribute Value | |
84 | T{ | |
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85 | .BR htonl (), |
86 | .BR htons (), | |
87 | .BR ntohl (), | |
7998494a | 88 | .BR ntohs () |
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89 | T} Thread safety MT-Safe |
90 | .TE | |
47297adb | 91 | .SH CONFORMING TO |
855dcf18 | 92 | POSIX.1-2001, POSIX.1-2008. |
847e0d88 | 93 | .PP |
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94 | Some systems require the inclusion of |
95 | .I <netinet/in.h> | |
96 | instead of | |
d1a6e6ff | 97 | .IR <arpa/inet.h> . |
47297adb | 98 | .SH SEE ALSO |
b1bc4fd1 | 99 | .BR bswap (3), |
095fdaea | 100 | .BR endian (3), |
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101 | .BR gethostbyname (3), |
102 | .BR getservent (3) |