clients/vfdload.c

   1 // ****************************************************************************
   2 //  vfdload.c                        (C) 1992-2003 Christophe de Dinechin (ddd)
   3 //                                                            Activity project
   4 // ****************************************************************************
   5 //
   6 //   File Description:
   7 //
   8 //     Display the current load using a bar graph
   9 //
  10 //
  11 //
  12 //
  13 //
  14 //
  15 //
  16 //
  17 // ****************************************************************************
  18 // This document is confidential.
  19 // Do not redistribute without written permission
  20 // ****************************************************************************
  21 // * File       : $RCSFile$
  22 // * Revision   : $Revision$
  23 // * Date       : $Date$
  24 // ****************************************************************************
  25
  26 #define VFDCLIENT               "vfdload"
  27 #define VFDOPTIONS              "vfdload.tbl"
  28 #define VFDCONFIG               "load"
  29 long refresh_rate = 100000;
  30
  31 #include "vfdclient.h"
  32
  33 typedef struct load
  34 // ----------------------------------------------------------------------------
  35 //   Information about system load
  36 // ----------------------------------------------------------------------------
  37 {
  38     unsigned long       user, sys, nice, idle, total;
  39 } load_t;
  40
  41
  42 int main(int argc, char *argv[])
  43 // ----------------------------------------------------------------------------
  44 //   Main entry point
  45 // ----------------------------------------------------------------------------
  46 {
  47      int vfd;
  48      vfd_configuration cf;
  49      int x, y, w, h;
  50      float load1, load2, load3;
  51      int h1, h2, h3;
  52      int by;
  53      load_t cur, prev, diff;
  54      int user[256], sys[256];
  55      int index = 0;
  56      int i;
  57
  58      vfd_options(argc, argv);
  59      vfd = vfd_open(server, port);
  60
  61      // Use configuration
  62      cf = vfd_configure(vfd, cfg);
  63      x = cf.x; y = cf.y; w = cf.w; h = cf.h;
  64      by = y + h - 1;
  65
  66      while (1)
  67      {
  68          FILE *f = fopen ("/proc/stat", "r");
  69          fscanf(f, "cpu %lu %lu %lu %lu",
  70                 &cur.user, &cur.nice, &cur.sys, &cur.idle);
  71          fclose(f);
  72          cur.total = cur.user + cur.nice + cur.sys + cur.idle;
  73
  74          diff.user = cur.user - prev.user;
  75          diff.sys  = cur.sys - prev.sys;
  76          diff.nice = cur.nice - prev.nice;
  77          diff.idle = cur.idle - prev.idle;
  78          diff.total = cur.total - prev.total;
  79
  80          prev = cur;
  81
  82          if (!diff.total)
  83              continue;
  84
  85          user[index] = (h -2) * (diff.user + diff.nice) / diff.total;
  86          sys[index] = (h - 2) * diff.sys / diff.total;
  87
  88          vfd_clear(vfd);
  89          vfd_rectangle(vfd, x, y, w, h);
  90          for (i = 0; i < w; i++)
  91          {
  92              int user_h = user[(index-i) & 255];
  93              int sys_h = sys[(index - i) & 255];
  94              vfd_fill_rectangle(vfd,
  95                                 x + w - 1 - i, by - user_h,
  96                                 1, user_h);
  97              vfd_fill_rectangle(vfd,
  98                                 x + w - 1 - i, y,
  99                                 1, sys_h);
 100          }
 101          vfd_update(vfd);
 102
 103          index = (index + 1) & 255;
 104          usleep(refresh_rate);
 105      }
 106      return 0;
 107 }
 108