NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

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

NAME         top

       htonl,  htons,  ntohl,  ntohs  -  convert values between host and network byte
       order

SYNOPSIS         top

       #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         top

       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         top

       POSIX.1-2001.

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

SEE ALSO         top

       endian(3), gethostbyname(3), getservent(3)

COLOPHON         top

       This page is part of release 3.32 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/.

GNU                                   2009-01-15                         BYTEORDER(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface