ntohl(9r)ntohl(9r)NAME
ntohl, ntohs - General: Convert longword and word values from network-to-host byte order
SYNOPSIS
#include <sys/param.h>
unsigned int ntohl(
unsigned int longword ); unsigned short ntohs(
unsigned short word );
ARGUMENTS
Specifies a 32-bit value to be conditionally byte swapped. Specifies a 16-bit value to be conditionally byte swapped.
DESCRIPTION
The ntohl routine converts the specified longword value from network-to-host byte order. The ntohs routine converts the specified word
value from network-to-host byte order.
The TCP/IP protocols specify the canonical network byte order, which is big endian (meaning that the most significant byte is leftmost in
memory).
RETURN VALUES
Upon successful completion, the ntohl routine returns the converted longword value in host byte order. Similarly, upon successful comple-
tion, the ntohs routine returns the converted word value in host byte order.
SEE ALSO
Routines: htonl(9r)ntohl(9r)
Check Out this Related Man Page
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 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 Signifi-
cant 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>.
SEE ALSO bswap(3), endian(3), gethostbyname(3), getservent(3)COLOPHON
This page is part of release 4.15 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 2017-09-15 BYTEORDER(3)