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loadavg.c
83 lines (74 loc) · 1.6 KB
/
loadavg.c
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#include <stdio.h>
#include <stdlib.h>
#include "activity.h"
#include "loadavg.h"
#define LOAD_FILE "/proc/loadavg"
#define LOAD_UPDATE (60*INTERVAL_SECOND)
#define LOAD_WHICH 1
loadavg_t Loadavg[3];
static loadavg_t load_read(char **s)
{
unsigned long x;
x = strtoul(*s, s, 10);
if (**s != '.')
{
*s = NULL;
return 0;
}
(*s)++;
x *= 100;
if (!(**s >= '0' && **s <= '9'))
return x;
x += 10*(*(*s)++-'0');
if (!(**s >= '0' && **s <= '9'))
return x;
x += *(*s)++-'0';
while (**s >= '0' && **s <= '9')
(*s)++;
return x;
}
static void load_update(struct activity *a, enum led led)
{
FILE *f = fopen(LOAD_FILE, "r");
if (f)
{
char buf[256];
size_t r = fread(buf, 1, sizeof(buf)-1, f);
fclose(f);
buf[r] = 0;
char *p = buf;
unsigned i;
for (i = 0; *p && i < sizeof(Loadavg)/sizeof(*Loadavg); i++)
Loadavg[i] = load_read(&p);
}
activity_add(a, led);
}
static struct activity Load_update = {
{ .len = LOAD_UPDATE },
.fun = &load_update
};
static void load_blink(struct activity *a, enum led led)
{
loadavg_t l = Loadavg[LOAD_WHICH];
enum led led_start = a->led_start;
a->led_start = a->led_end;
a->led_end = led_start;
if (l > 4*INTERVAL_SECOND*100/LOAD_UPDATE)
a->seg.len = MAX(4*INTERVAL_SECOND*100/l, INTERVAL_SECOND/2);
else
a->seg.len = LOAD_UPDATE;
activity_add(a, led);
}
static struct activity Load_blink = {
{ .len = LOAD_UPDATE },
.led_start = LED_LOAD_1,
.led_end = LED_LOAD_0,
.fun = &load_blink
};
void loadavg_init()
{
color_t c = { 0, COLOR_MAX/2, COLOR_MAX/2 };
base_set(c, LED_LOAD_1);
load_update(&Load_update, 0);
load_blink(&Load_blink, 0);
}