//-------------------------------------------------------------------
//	int0x80.cpp
//
//	This program will invoke system calls via the interrupt-0x80 
//	interface at regular periodic intervals, allowing us to view
//	the counting of their occurrences in our dynamic display. 
//
//		to compile:  $ g++ int0x80.cpp -o int0x80
//		to execute:  $ ./int0x80
//
//	programmer: ALLAN CRUSE
//	written on: 01 SEP 2009
//-------------------------------------------------------------------

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


char buf = 'A';		// this is 'global' to simplify 'asm' 

int main( int argc, char **argv )
{
	// slowly draw each of the letters of the alphabet 
	for (int i = 0; i < 26; i++)
		{
		asm(	" mov  $4, %eax \n"\
			" mov  $1, %ebx \n"\
			" lea  buf, %ecx \n"\
			" mov  $1, %edx \n"\
			" int  $0x80 " );
		sleep( 1 );
		++buf;
		}
	printf( "\n" );
}