htonl(3XNET) X/Open Networking Services Library Functions htonl(3XNET)NAME
htonl, htons, ntohl, ntohs - convert values between host and network byte order
SYNOPSIS
cc [ flag ... ] file ... -lxnet [ library ... ]
#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
These functions convert 16-bit and 32-bit quantities between network byte order and host byte order.
The uint32_t and uint16_t types are made available by inclusion of <inttypes.h>.
USAGE
These functions are most often used in conjunction with Internet addresses and ports as returned by gethostent(3XNET) and getser-
vent(3XNET).
On some architectures these functions are defined as macros that expand to the value of their argument.
RETURN VALUES
The htonl() and htons() functions return the argument value converted from host to network byte order.
The ntohl() and ntohs() functions return the argument value converted from network to host byte order.
ERRORS
No errors are defined.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO endhostent(3XNET), endservent(3XNET), attributes(5), standards(5)SunOS 5.10 10 Jun 2002 htonl(3XNET)
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)