lib/libc/gen/minix/getloadavg.c

   1 #include <sys/cdefs.h>
   2 #include "namespace.h"
   3
   4 #include <sys/types.h>
   5 #include <paths.h>
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <lib.h>
  10
  11 #ifdef __weak_alias
  12 __weak_alias(getloadavg, _getloadavg)
  13 #endif
  14
  15 /* Retrieve system load average information. */
  16 int getloadavg(double *loadavg, int nelem)
  17 {
  18   FILE *fp;
  19   int i;
  20
  21   if(nelem < 1) {
  22         errno = ENOSPC;
  23         return -1;
  24   }
  25
  26   if((fp = fopen(_PATH_PROC "loadavg", "r")) == NULL)
  27         return -1;
  28
  29   for(i = 0; i < nelem; i++)
  30         if(fscanf(fp, "%lf", &loadavg[i]) != 1)
  31                 break;
  32
  33   fclose(fp);
  34
  35   if (i == 0) {
  36         errno = ENOENT;
  37         return -1;
  38   }
  39
  40   return i;
  41 }