//-------------------------------------------------------------------
//	printmac.cpp
//
//	This application prints the unique hardware address of this
//	workstation's RealTek 8139 Network Interface Controller, if
//	the kernel's 'sys_call_table[]' has been patched with a new
//	system-call which implements that functionality in place of
//	the unimplemented system-call for the obsolete 'sys_break'.
//
//	programmer: ALLAN CRUSE
//	written on: 15 MAY 2005
//-------------------------------------------------------------------

#include <stdio.h>	// for printf() 
#include <asm/unistd.h>	// for __NR_break

int get_mac_address( unsigned char *addrbuf )
{
	int	retval = 0;

	asm(" movl %0, %%eax " : : "i" (__NR_break) );
	asm(" movl %0, %%ebx " : : "m" (addrbuf) );
	asm(" int $0x80 ");
	asm(" movl %%eax, %0 " : "=m" (retval) );

	return	retval;
}


int main( void )
{
	unsigned char	hwaddr[ 6 ] = {0};

	get_mac_address( hwaddr );

	printf( "\nnetwork interface address: " );
	for (int i = 0; i < 6; i++)
		{
		printf( "%02X", hwaddr[ i ] );
		if ( i < 5 ) printf( ":" );
		}
	printf( "\n\n" );
}