byteorder(3): - convert values between host and network byte order

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.

ATTRIBUTES

   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

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

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

COLOPHON

   This page is part of release 4.09 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/.

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