htonl, htons, ntohl, ntohs — convert values between
host and network byte order
Synopsis
#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);
DESCRIPTION
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.
CONFORMING TO
POSIX.1-2001.
Some systems require the inclusion of <netinet/in.h> instead of <arpa/inet.h>
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.
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Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
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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
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Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
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 (faith@cs.unc.edu)
Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aeb@cwi.nl)