monitor.c

EGui是一个开源的图形系统软件,类似于QT/Embedded、GTK-FB、MicroWindow。目标是嵌入式平台整合解 决方案。基于Linux Framebuffer 设备驱动上实现。有完

/********************************************************
 * Egui code,LGPL
 * Function : Test Linux framebuffer 
 * Author: [e-mail]
 * Data : 2005-08-09
 * $Id: monitor.c,v 1.10 2006/04/14 00:53:28 hjs Exp $
 ********************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <ctype.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


#include <Egui.h>

#define MAX 100

int value[MAX];

EGui_FBinfo Efbinfo;
Ecolor fcolor;
Ecolor lcolor;
Ecolor bcolor;



#define NCPUSTATES 4
static char *cpustatenames[NCPUSTATES+1] =
{
    "user", "nice", "system", "idle",
    NULL
};


/*=SYSTEM STATE INFO====================================================*/
    
/* these are for calculating cpu state percentages */

static long cp_time[NCPUSTATES];
static long cp_old[NCPUSTATES];
static long cp_diff[NCPUSTATES];

static int cpu_states[NCPUSTATES];


static inline char *
skip_ws(const char *p)
{   
    while (isspace(*p)) p++;
    return (char *)p;
}   
    
static inline char *
skip_token(const char *p)
{   
    while (isspace(*p)) p++; 
    while (*p && !isspace(*p)) p++;
    return (char *)p;
}


long percentages(cnt, out, new, old, diffs)

int cnt;
int *out;
register long *new;
register long *old;
long *diffs;

{
    register int i;
    register long change;
    register long total_change;
    register long *dp;
    long half_total;
    
    /* initialization */
    total_change = 0;
    dp = diffs;

    /* calculate changes for each state and the overall change */
    for (i = 0; i < cnt; i++)
    {
        if ((change = *new - *old) < 0)
        {
            /* this only happens when the counter wraps */
            change = (int)
                ((unsigned long)*new-(unsigned long)*old);
        }
        total_change += (*dp++ = change);
        *old++ = *new++;
    }

    /* avoid divide by zero potential */
    if (total_change == 0)
    {
        total_change = 1;
    }

    /* calculate percentages based on overall change, rounding up */
    half_total = total_change / 2l;
    for (i = 0; i < cnt; i++)
    {
  
      *out = (int)((*diffs * 1000 + half_total) / total_change);
      out ++;
      diffs ++;
    }

    /* return the total in case the caller wants to use it */
    return(total_change);
}

int 
get_system_info ()
{
  int fd;
  int len;
  char buffer[4096+1];
  char *p;

  fd = open("/proc/stat", O_RDONLY);
  len = read(fd, buffer, sizeof(buffer)-1);
  close(fd);
  buffer[len] = '\0';
  
  p = skip_token(buffer);                 /* "cpu" */
  cp_time[0] = strtoul(p, &p, 0);
  cp_time[1] = strtoul(p, &p, 0);
  cp_time[2] = strtoul(p, &p, 0);
  cp_time[3] = strtoul(p, &p, 0);
  
  /* convert cp_time counts to percentages */
  percentages(4, cpu_states, cp_time, cp_old, cp_diff);
  //  printf ("IDLE=%d\n",cpu_states[3]/10);
  return cpu_states[3] / 10;
  
}

void
display_recall (unsigned int * para)
{
  int i,height,width;
  char cpuinfo[10];
  Efont *font;
  EGui_Window * ewindow;


  ewindow = ( EGui_Window *) (para);
  

  for (i=1;i<MAX;i++)
    value[i-1] = value[i];

  /* get_system_info = IDLE value */
  width = ewindow->frame_w;
  value[MAX-1] = get_system_info();
  for (i=width;i<(MAX+width);i++){
    height = ewindow->frame_w + ewindow->title_h;
    Egui_vline (i,height,i,100 + height-1,&bcolor,ewindow);
    Egui_vline (i,value[i-width]+height-1,i,100+height-1,&lcolor,ewindow);
  }
  sprintf(cpuinfo,"cpu:%02d%%",100-value[MAX-1]);
  Egui_drawstring(30,40,cpuinfo,font,&fcolor,ewindow);

  Egui_timer_insert(1000,display_recall,(unsigned int *)ewindow);
}

int
main ()
{

  int i;
  int height;
  EGui_Window * ewindow;
  Ecolor * color;

  Egui_open (&Efbinfo);

  for (i=0;i<MAX;i++)
    value[i] = 100;

  get_system_info ();

  color = malloc (sizeof ( Ecolor));
  if (color == NULL)
    {
      printf ("malloc color ERROR\n");
      return -1;
    }

  color->r = color->g = color->b = 0xcc;
  /* create window will initial color's pixel. 
   */
  ewindow = Egui_CreateWindow (&Efbinfo,50,50,100,100,color,EGUI_WINDOW_TOP);
  if (ewindow == NULL)
    {
      printf ("New windows failed\n");
      Egui_close ();
      return 1;
    }
 
  Egui_drawwindow(ewindow);

  fcolor.r = fcolor.g = 0;
  fcolor.b = 0xFF;
  color_from_rgb (ewindow,&fcolor);

  lcolor.r = lcolor.b = 0;
  lcolor.g = 0xFF;
  color_from_rgb (ewindow,&lcolor);

  bcolor.r = bcolor.b = 0;
  bcolor.g = 0;
  color_from_rgb (ewindow,&bcolor);

  Egui_timer_insert(1000,display_recall,(unsigned int *)ewindow);

  egui_loop ();

  
  Egui_CloseWindow (ewindow);
  free(color);
  Egui_close ();

}