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BYTEORDER(3)                        Linux Programmer's Manual                        BYTEORDER(3)



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 net‐
       work 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.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The htonl(), htons(), ntohl(), and ntohs() functions are thread-safe.

CONFORMING TO
       POSIX.1-2001.

       Some systems require the inclusion of <netinet/in.h> instead of <arpa/inet.h>.

SEE ALSO
       endian(3), gethostbyname(3), getservent(3)

COLOPHON
       This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2014-04-08                               BYTEORDER(3)


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