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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
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20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" References consulted: | |
| 24 | .\" Linux libc source code | |
| 25 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 26 | .\" 386BSD man pages | |
| 27 | .\" Modified Sat Jul 24 21:29:05 1993 by Rik Faith (faith@cs.unc.edu) | |
| 28 | .\" Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aeb@cwi.nl) | |
| 29 | .\" | |
| 30 | .TH BYTEORDER 3 1993-04-15 "BSD" "Linux Programmer's Manual" | |
| 31 | .SH NAME | |
| 32 | htonl, htons, ntohl, ntohs \- convert values between host and network | |
| 33 | byte order | |
| 34 | .SH SYNOPSIS | |
| 35 | .nf | |
| d1a6e6ff | 36 | .B #include <arpa/inet.h> |
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37 | .sp |
| 38 | .BI "uint32_t htonl(uint32_t " hostlong ); | |
| 39 | .sp | |
| 40 | .BI "uint16_t htons(uint16_t " hostshort ); | |
| 41 | .sp | |
| 42 | .BI "uint32_t ntohl(uint32_t " netlong ); | |
| 43 | .sp | |
| 44 | .BI "uint16_t ntohs(uint16_t " netshort ); | |
| 45 | .fi | |
| 46 | .SH DESCRIPTION | |
| 63aa9df0 | 47 | The \fBhtonl\fP() function converts the unsigned integer \fIhostlong\fP |
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48 | from host byte order to network byte order. |
| 49 | .PP | |
| 63aa9df0 | 50 | The \fBhtons\fP() function converts the unsigned short integer \fIhostshort\fP |
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51 | from host byte order to network byte order. |
| 52 | .PP | |
| 63aa9df0 | 53 | The \fBntohl\fP() function converts the unsigned integer \fInetlong\fP |
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54 | from network byte order to host byte order. |
| 55 | .PP | |
| 63aa9df0 | 56 | The \fBntohs\fP() function converts the unsigned short integer \fInetshort\fP |
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57 | from network byte order to host byte order. |
| 58 | .PP | |
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59 | On the i80x86 the host byte order is Least Significant Byte first, |
| 60 | whereas the network byte order, as used on the Internet, is Most | |
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61 | Significant Byte first. |
| 62 | .SH "CONFORMING TO" | |
| 68e1685c | 63 | POSIX.1-2001. |
| d1a6e6ff | 64 | |
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65 | Some systems require the inclusion of |
| 66 | .I <netinet/in.h> | |
| 67 | instead of | |
| d1a6e6ff | 68 | .IR <arpa/inet.h> . |
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69 | .SH "SEE ALSO" |
| 70 | .BR gethostbyname (3), | |
| 71 | .BR getservent (3) |