inet_lnaof Subroutine
Purpose
Returns the host ID of an Internet address.
Library
Standard C Library (libc.a)
Syntax
#include <sys/socket.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>int inet_Inaof ( InternetAddr)
struct in_addr InternetAddr;
struct in_addr InternetAddr;
Description
The inet_lnaof subroutine masks off the host ID of an Internet address based on the Internet address class. The calling application must enter the Internet address as an unsigned long value.
All applications containing the inet_lnaof subroutine must be compiled with the _BSD macro set to a specific value. Acceptable values are 43 and 44. In addition, all socket applications must include the BSD libbsd.a library.
Note: The
application must verify that the network and host IDs for the Internet
address conform to either a Class A, B, or C Internet address. The inet_lnaof subroutine
processes any other number as a Class C address.
Parameters
| Item | Description |
|---|---|
| InternetAddr | Specifies the Internet address to separate. |
Return Values
The return values of the inet_lnaof subroutine depend on the class of Internet address the application provides:
| Value | Description |
|---|---|
| Class A | The logical product of the Internet address and 0x00FFFFFF. |
| Class B | The logical product of the Internet address and 0x0000FFFF. |
| Class C | The logical product of the Internet address and 0x000000FF. |
Files
| Item | Description |
|---|---|
| /etc/hosts | Contains host names. |