Name

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>

SEE ALSO

gethostbyname(3), getservent(3)

COLOPHON

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 (davidprism.demon.co.uk)

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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)