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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <parportled.h>
/* Get the current statistics on the cpu */
int cpu(FILE *pstat)
{
int nidle, nnice, nsystem, nuser;
int total;
int user, nice, system, idle;
static int last_user, last_nice, last_system, last_idle;
char dummy[1024];
rewind(pstat);
fscanf(pstat,"%s %d %d %d %d", dummy, &user, &nice, &system, &idle);
fflush(pstat);
nidle = idle-last_idle;
nuser = user-last_user;
nsystem = system-last_system;
nnice = nice-last_nice;
total = nnice + nsystem + nuser + nidle;
last_nice = nice;
last_user = user;
last_system=system;
last_idle=idle;
return(total-nidle);
}
int loop(void)
{
FILE *pstat;
int load;
int lights[MAXLED];
int blink=0;
if(!(pstat = fopen("/proc/stat", "r")))
{
fprintf(stderr, "Unable to open /proc/stat\n");
exit(EXIT_FAILURE);
}
/* Call cpu() a first time to init counters */
cpu(pstat);
led_off_all();
while(1)
{
blink++;
for(load = 0; load < MAXLED; load++)
lights[load] = 0;
load = cpu(pstat) / 1.5; //(12 / (MAXLED - 1));
while(load > 6) load--;
for(; load >= 0; load--)
lights[load] = 1;
if(blink == 10) { lights[MAXLED-1] = 1; blink = 0; }
led_off_all();
led_set_on(lights);
usleep(100000);
}
fclose(pstat);
return(0);
}
int main(int argc, char **argv)
{
pid_t id;
if((id=fork()) != -1)
{
if(id == 0)
{
if(led_setperm())
{
fprintf(stderr,"Cannot open device, ioperm error.\n");
exit(EXIT_FAILURE);
}
setsid();
loop();
}
}
else { printf("Could not fork!\n"); exit(EXIT_FAILURE); }
return(EXIT_SUCCESS);
}
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