add issetugid function to check for elevated privilege

[musl] / src / legacy / getloadavg.c

#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.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);
        return n;
}