HTONL(P) POSIX Programmer's Manual HTONL(P)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
These functions shall convert 16-bit and 32-bit quantities between net‐
work byte order and host byte order.
On some implementations, these functions are defined as macros.
The uint32_t and uint16_t types are defined in <inttypes.h>.
RETURN VALUE
The htonl() and htons() functions shall return the argument value con‐
verted from host to network byte order.
The ntohl() and ntohs() functions shall return the argument value con‐
verted from network to host byte order.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
These functions are most often used in conjunction with IPv4 addresses
and ports as returned by gethostent() and getservent().
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOendhostent() , endservent() , the Base Definitions volume of
IEEE Std 1003.1-2001, <inttypes.h>, <arpa/inet.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 HTONL(P)
