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getloadavg: use sysinfo() instead of /proc/loadavg 

Based on a patch by Szabolcs Nagy.
This commit is contained in:
Alexander Monakov 2015-02-24 21:44:07 +03:00 committed by Rich Felker
parent 2de85a9856
commit 20cbd60775
1 changed files with 7 additions and 11 deletions
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18
src/legacy/getloadavg.c
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@ -1,18 +1,14 @@
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/sysinfo.h>
int getloadavg(double *a, int n)
{
int i;
double b[3];
FILE *f = fopen("/proc/loadavg", "rbe");
if (!f) return -1;
i = fscanf(f, "%lf %lf %lf", b, b+1, b+2);
fclose(f);
if (n > i) n = i;
if (n < 0) return -1;
memcpy(a, b, n * sizeof *a);
struct sysinfo si;
if (n <= 0) return n ? -1 : 0;
sysinfo(&si);
if (n > 3) n = 3;
for (int i=0; i<n; i++)
a[i] = 1.0/(1<<SI_LOAD_SHIFT) * si.loads[i];
return n;
}