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

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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────────────────────────────┬───────────────┬─────────┐
       │Interface                          Attribute     Value   │
       ├───────────────────────────────────┼───────────────┼─────────┤
       │htonl(), htons(), ntohl(), ntohs() │ Thread safety │ MT-Safe │
       └───────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

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

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 4.08 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/.

GNU                              2016-10-08                     BYTEORDER(3)