sanity checks

LoadAverageMeter.c

@@ -20,12 +20,15 @@ int LoadMeter_attributes[] = { LOAD };
 
 static inline void LoadAverageMeter_scan(double* one, double* five, double* fifteen) {
    int activeProcs, totalProcs, lastProc;
+   *one = 0; *five = 0; *fifteen = 0;
    FILE *fd = fopen(PROCDIR "/loadavg", "r");
-   int total = fscanf(fd, "%lf %lf %lf %d/%d %d", one, five, fifteen,
-      &activeProcs, &totalProcs, &lastProc);
-   (void) total;
-   assert(total == 6);
-   fclose(fd);
+   if (fd) {
+      int total = fscanf(fd, "%lf %lf %lf %d/%d %d", one, five, fifteen,
+         &activeProcs, &totalProcs, &lastProc);
+      (void) total;
+      assert(total == 6);
+      fclose(fd);
+   }
 }
 
 static void LoadAverageMeter_setValues(Meter* this, char* buffer, int size) {

UptimeMeter.c

@@ -21,8 +21,10 @@ int UptimeMeter_attributes[] = {
 static void UptimeMeter_setValues(Meter* this, char* buffer, int len) {
    double uptime = 0;
    FILE* fd = fopen(PROCDIR "/uptime", "r");
-   fscanf(fd, "%lf", &uptime);
-   fclose(fd);
+   if (fd) {
+      fscanf(fd, "%lf", &uptime);
+      fclose(fd);
+   }
    int totalseconds = (int) ceil(uptime);
    int seconds = totalseconds % 60;
    int minutes = (totalseconds/60) % 60;