#include <sys/syscall.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#define SYS_TASK_INFO          280
#define SYS_HELLOWORLD		     281

FILE *fp = NULL;

typedef struct {
        long state;
        int pid, tgid;
        unsigned long utime, stime;

        int prio, static_prio;
        unsigned long sleep_avg;
        unsigned int time_slice, first_time_slice;
} task_info_struct;

void CPU_burst(int times)
{
	double x = 1, y = 2, z = 1.5; 
	int i, j, k;
	for (i = 0; i < times; i++)
		for (j = 0; j < 10000; j++);
			for (k = 0; k < 10000; k++) {
				x = y*z/x;	
				y = x;
			}
}

void IO_burst(int nblocks)
{	
	char temp[1024];
	int i;
        long file_size, read_pos;

	if (!fp) {
		fp = fopen("test.txt", "r");
		fseek(fp, 0, SEEK_END);
		file_size = ftell(fp);
	}

	for (i = 0; i < nblocks; i++) {
		read_pos = (float)rand()/RAND_MAX*file_size - 1024;
		fseek(fp, read_pos, SEEK_SET);
		fread(temp, 1, 1024, fp);
	}	
}


int main()
{
 	int n = 0;

	task_info_struct task_info;
        int ret;

while(1) {	
	CPU_burst(100);
	IO_burst(100);
        sleep(1);
	ret = syscall(SYS_TASK_INFO, &task_info);
	if (!ret) {
		printf("\n");
        	printf("process [%d : %d] State = %s \n", task_info.pid, task_info.tgid, (task_info.state==0)? "Running" : "Blocked");
        	printf("utime = %ld stime = %ld \n", task_info.utime, task_info.stime);
		printf("prio = %d  static_prio = %d sleep_avg = %ld\n", task_info.prio, task_info.static_prio, task_info.sleep_avg);
	}
}		
        return 0;	
}