htonl, htons, ntohl, ntohs — convert values between host and network byte order
#include <arpa/inet.h>
uint32_t
htonl( |
uint32_t hostlong); |
uint16_t
htons( |
uint16_t hostshort); |
uint32_t
ntohl( |
uint32_t netlong); |
uint16_t
ntohs( |
uint16_t netshort); |
The htonl() function
converts the unsigned integer hostlong from host byte order
to network byte order.
The htons() function
converts the unsigned short integer hostshort from host byte order
to network byte order.
The ntohl() function
converts the unsigned integer netlong from network byte order
to host byte order.
The ntohs() function
converts the unsigned short integer netshort from network byte
order to host byte order.
On the i386 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Significant Byte first.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
htonl(), htons(), ntohl(), ntohs() |
Thread safety | MT-Safe |
POSIX.1-2001, POSIX.1-2008.
Some systems require the inclusion of <netinet/in.h> instead of <arpa/inet.h>
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 1993 David Metcalfe (davidprism.demon.co.uk) %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 21:29:05 1993 by Rik Faith (faithcs.unc.edu) Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aebcwi.nl) |