source: npl/mediabox/lcdproc_edwin/src/clients/lcdproc/mem.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef IRIX
#include <strings.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>

#include "../../shared/sockets.h"
#include "../../shared/LL.h"

#include "main.h"
#include "mode.h"
#include "mem.h"

struct meminfo { int total, cache, buffers, free, shared; };

int meminfo_fd = 0;

static void get_mem_info(struct meminfo *result);

static void get_mem_info(struct meminfo *result) 
{
//  int i, res; char *bufptr;

  reread(meminfo_fd, "get_meminfo:");
  result[0].total   = getentry("MemTotal:", buffer);
  result[0].free    = getentry("MemFree:", buffer);
  result[0].shared  = getentry("MemShared:", buffer);
  result[0].buffers = getentry("Buffers:", buffer);
  result[0].cache   = getentry("Cached:", buffer);
  result[1].total   = getentry("SwapTotal:", buffer);
  result[1].free    = getentry("SwapFree:", buffer); 
}


int mem_init()
{
   if(!meminfo_fd)
   {
      meminfo_fd = open("/proc/meminfo",O_RDONLY);
   }

   return 0;
}

int mem_close()
{
   if(meminfo_fd)
      meminfo_fd = open("/proc/meminfo",O_RDONLY);

   meminfo_fd = 0;
   
   return 0;
}


/////////////////////////////////////////////////////////////////////////
// Mem Screen displays info about memory and swap usage...
//
int mem_screen(int rep, int display)
{
  int n;
  struct meminfo mem[2];
  static int first = 1;
  static int which_title=0;
  float value;
  
  if(first)
  {
     first = 0;

     sock_send_string(sock, "screen_add M\n");
     sprintf(buffer, "screen_set M name {Memory & Swap: %s}\n", host);
     sock_send_string(sock, buffer);

     if(lcd_hgt >= 4)
     {
        sock_send_string(sock, "widget_add M title title\n");
        sock_send_string(sock, "widget_set M title { MEM -==- SWAP}\n");
        sock_send_string(sock, "widget_add M totl string\n");
        sock_send_string(sock, "widget_add M used string\n");
        sock_send_string(sock, "widget_set M totl 9 2 Totl\n");
        sock_send_string(sock, "widget_set M used 9 3 Free\n");
        sock_send_string(sock, "widget_add M EF string\n");
        sock_send_string(sock, "widget_set M EF 1 4 {E       F  E       F}\n");
        sock_send_string(sock, "widget_add M memused string\n");
        sock_send_string(sock, "widget_add M swapused string\n");
        //sock_send_string(sock, "widget_set M memgauge 2 4 0\n");
        //sock_send_string(sock, "widget_set M swapgauge 13 4 0\n");
     }
     else
     {
        sock_send_string(sock, "widget_add M m string\n");
        sock_send_string(sock, "widget_add M s string\n");
        if(lcd_wid >= 20)
        {
           sock_send_string(sock, "widget_set M m 1 1 {M     [       ]}\n");
           sock_send_string(sock, "widget_set M s 1 2 {S     [       ]}\n");
        }
        else
        {
           sock_send_string(sock, "widget_set M m 1 1 {M     [   ]}\n");
           sock_send_string(sock, "widget_set M s 1 2 {S     [   ]}\n");
        }
        sock_send_string(sock, "widget_add M mem% string\n");
        sock_send_string(sock, "widget_add M swap% string\n");
        sock_send_string(sock, "widget_set M mem% 16 1 { 0.0%}\n");
        sock_send_string(sock, "widget_set M swap% 16 2 { 0.0%}\n");
        
        //sock_send_string(sock, "widget_set M memgauge 8 1 0\n");
        //sock_send_string(sock, "widget_set M swapgauge 8 2 0\n");
     }

     sock_send_string(sock, "widget_add M memtotl string\n");
     sock_send_string(sock, "widget_add M swaptotl string\n");
     
     sock_send_string(sock, "widget_add M memgauge hbar\n");
     sock_send_string(sock, "widget_add M swapgauge hbar\n");
     
     //sock_send_string(sock, "\n");
  }


  get_mem_info(mem);

  
  // flip the title back and forth...
  if(lcd_hgt >= 4)
  {
     if(which_title & 4)
     {
        sprintf(buffer, "widget_set M title {%s}\n", host);
        sock_send_string(sock, buffer);
     }
     else sock_send_string(sock, "widget_set M title { MEM -==- SWAP}\n");
     which_title = (which_title + 1)&7;


     // Total memory
     sprintf(tmp, "widget_set M memtotl 1 2 {%6dk}\n", mem[0].total);
     if(display) sock_send_string(sock, tmp);

     // Free memory (plus buffers and cache)
     sprintf(tmp, "widget_set M memused 1 3 {%6dk}\n",
             mem[0].free + mem[0].buffers + mem[0].cache);
     if(display) sock_send_string(sock, tmp);

     // Total swap
     sprintf(tmp, "widget_set M swaptotl 14 2 {%6dk}\n", mem[1].total);
     if(display) sock_send_string(sock, tmp);

     // Free swap
     sprintf(tmp, "widget_set M swapused 14 3 {%6dk}\n", mem[1].free);
     if(display) sock_send_string(sock, tmp);


     // Free memory graph
     n = (int)(35.0 -
               ((float)mem[0].free + (float)mem[0].buffers + (float)mem[0].cache)
               / (float)mem[0].total
               * 35.0);
     sprintf(tmp, "widget_set M memgauge 2 4 %i\n", n);
     if(display) sock_send_string(sock, tmp);
     
     // Free swap graph
     n = (int)(35.0 -
               (float)mem[1].free / (float)mem[1].total
               * 35.0);
     sprintf(tmp, "widget_set M swapgauge 13 4 %i\n", n);
     if(display) sock_send_string(sock, tmp);
  }
  else
  {
     // Total memory
     sprintf(tmp, "widget_set M memtotl 2 1 {%4dM}\n",
             (int)(mem[0].total / 1024.0));
     if(display) sock_send_string(sock, tmp);

     // Total swap
     sprintf(tmp, "widget_set M swaptotl 2 2 {%4dM}\n",
             (int)(mem[1].total / 1024.0));
     if(display) sock_send_string(sock, tmp);


     // Free memory graph
     value = ((float)mem[0].free + (float)mem[0].buffers + (float)mem[0].cache)
        / (float)mem[0].total;
     value = 1.0 - value;
     n = (int)((lcd_cellwid * (float)(lcd_wid-13))*(value));
     sprintf(tmp, "widget_set M memgauge 8 1 %i\n", n);
     if(display) sock_send_string(sock, tmp);

     value *= 100.0;
     if (value >= 99.9) { sprintf(buffer, "100%%"); } 
     else { sprintf(buffer, "%4.1f%%", value); }
     sprintf(tmp, "widget_set M mem%% %i 1 {%s}\n", lcd_wid-4, buffer);
     if(display) sock_send_string(sock, tmp);

     // Free swap graph
     value = ((float)mem[1].free / (float)mem[1].total);
     value = 1.0 - value;
     n = (int)((lcd_cellwid * (float)(lcd_wid-13))*(value));
     sprintf(tmp, "widget_set M swapgauge 8 2 %i\n", n);
     if(display) sock_send_string(sock, tmp);

     value *= 100.0;
     if (value >= 99.9) { sprintf(buffer, "100%%"); } 
     else { sprintf(buffer, "%4.1f%%", value); }
     sprintf(tmp, "widget_set M swap%% %i 2 {%s}\n", lcd_wid-4, buffer);
     if(display) sock_send_string(sock, tmp);


  }
  


  return 0;
} // End mem_screen()



typedef struct proc_mem_info
{
      char name[16];  // Is this really long enough?
      // Size isn't used any more...
      // Totl stores the "size" of the program now...
      int size, totl;
      int number;
} proc_mem_info;


static int sort_procs(void *a, void *b)
{
   proc_mem_info *one, *two;
   
   if(!a) return 0;
   if(!b) return 0;

   one = (proc_mem_info *)a;
   two = (proc_mem_info *)b;

   return (two->totl > one->totl);
}

   
int mem_top_screen(int rep, int display)
{
   // Much of this code was ripped from "gmemusage"
   char buf[128];   

   DIR *proc;
   FILE *StatusFile;
   struct dirent * procdir;
   
   char procName[16];
   int
      procSize ,
      procRSS ,
      procData ,
      procStk ,
      procExe ;
   const char
      *NameLine = "Name:" ,
      *VmSizeLine = "VmSize:" ,
      *VmRSSLine = "VmRSS" ,
      *VmDataLine = "VmData" ,
      *VmStkLine = "VmStk" ,
      *VmExeLine = "VmExe" ;
   const int
      NameLineLen = strlen ( NameLine ) ,
      VmSizeLineLen = strlen ( VmSizeLine ) ,
      VmDataLineLen = strlen ( VmDataLine ) ,
      VmStkLineLen = strlen ( VmStkLine ) ,
      VmExeLineLen = strlen ( VmExeLine ) ,
      VmRSSLineLen = strlen ( VmRSSLine ) ;

   
   int threshold = 400, unique;
   int i;
   proc_mem_info *p;
   LL * procs;
   static int first = 1;

   if(first)
   {
      first = 0;

      sock_send_string(sock, "screen_add S\n");
      sprintf(buffer, "screen_set S name {Top Memory Use: %s}\n", host);
      sock_send_string(sock, buffer);
      sock_send_string(sock, "widget_add S title title\n");
      sprintf(buffer, "widget_set S title {TOP MEM: %s}\n", host);
      sock_send_string(sock, buffer);
      sock_send_string(sock, "widget_add S f frame\n");
      if(lcd_hgt >= 4)
         sock_send_string(sock, "widget_set S f 1 2 20 4 20 5 v 8\n");
      else
         sock_send_string(sock, "widget_set S f 1 2 20 2 20 5 v 16\n");
      for(i=1; i<=5; i++)
      {
         sprintf(buffer, "widget_add S %i string -in f\n", i);
         sock_send_string(sock, buffer);
      }
      sock_send_string(sock, "widget_set S 1 1 1 Checking...\n");
   }
   

   procs = LL_new();
   if(!procs)
   {
      fprintf(stderr, "mem_top_screen: Error allocating list\n");
      return -1;
   }

   
   if ( ( proc = opendir ( "/proc" ) ) == NULL )
   {
      fprintf ( stderr , "mem_top_screen: unable to open /proc" ) ;
      perror ( "" ) ;
      return -1;
   }

   while ( (procdir = readdir ( proc )) )
   {
      if ( !index ( "1234567890" , procdir -> d_name [0] ) )
      {
         continue ;
      }
      sprintf ( buf , "/proc/%s/status" , procdir -> d_name ) ;
      if ( ( StatusFile = fopen ( buf , "r" ) ) == NULL )
      {
         // Not a serious error; process has finished before we could
         // examine it:
         //fprintf ( stderr , "mem_top_screen: cannot open %s for reading" ,
         //          buf ) ;
         //perror ( "" ) ;
         continue ;
      }
      procRSS = procSize = procData = procStk = procExe = 0 ;
      while ( fgets ( buf , sizeof ( buf ) , StatusFile ) )
      {
         if ( !strncmp ( buf , NameLine , NameLineLen ) )
         {
            /* Name: procName */
            sscanf ( buf , "%*s %s" , procName ) ;
         }
         else if ( !strncmp ( buf , VmSizeLine , VmSizeLineLen ) )
         {
            /* VmSize: procSize kB */
            sscanf ( buf , "%*s %d" , &procSize ) ;
         }
         else if ( !strncmp ( buf , VmRSSLine , VmRSSLineLen ) )
         {
            /* VmRSS: procRSS kB */
            sscanf ( buf , "%*s %d" , &procRSS ) ;
         }
         else if ( !strncmp ( buf , VmDataLine , VmDataLineLen ) )
         {
            /* VmData: procData kB */
            sscanf ( buf , "%*s %d" , &procData ) ;
         }
         else if ( !strncmp ( buf , VmStkLine , VmStkLineLen ) )
         {
            /* VmStk: procStk kB */
            sscanf ( buf , "%*s %d" , &procStk ) ;
         }
         else if ( !strncmp ( buf , VmExeLine , VmExeLineLen ) )
         {
            /* VmExe: procExe kB */
            sscanf ( buf , "%*s %d" , &procExe ) ;
         }
      }
      fclose ( StatusFile ) ;
      if(procSize > threshold)
      {
         // Figure out if it's sharing any memory...
         unique = 1;
         LL_Rewind(procs);
         do {
            p = LL_Get(procs);
            if(p)
            {
               if(0 == strcmp(p->name, procName))
               {
                  unique = 0;
                  p->number ++;
                  p->totl += procData + procStk + procExe;
               }
            }
         } while(LL_Next(procs) == 0);

         // If this is the first one by this name...
         if(unique)
         {
            p = malloc(sizeof(proc_mem_info));
            if(!p)
            {
               fprintf(stderr,
                       "mem_top_screen: Error allocating process entry\n");
               goto end;  // Ack!  I hate goto's!
            }
            strcpy(p->name, procName);
            p->size = procSize;
            p->totl = procData + procStk + procExe;
            p->number = 1;
            // TODO:  Check for errors here?
            LL_Push(procs, (void *)p);
         }
      }
         
   }
   closedir ( proc ) ;


   // Now, print some info...
   LL_Rewind(procs);
   LL_Sort(procs, sort_procs);
   LL_Rewind(procs);
   for(i=1; i<=5; i++)
   {
      p = LL_Get(procs);
      if(p)
      {
         //printf("Mem hog: %s: %ik\n", p->name, p->size);
         if(p->number > 1)
            sprintf(buffer, "widget_set S %i 1 %i {%i%6ik %s(%i)}\n", i, i, i,
                    p->totl, p->name, p->number);
         else
            sprintf(buffer, "widget_set S %i 1 %i {%i%6ik %s}\n", i, i, i,
                    p->totl, p->name);
         if(display) sock_send_string(sock, buffer);
      }
      else
      {
         //printf("Mem hog: none?\n");
         sprintf(buffer, "widget_set S %i 1 %i {}\n", i, i);
         if(display) sock_send_string(sock, buffer);
      }

      LL_Next(procs);
   }

   
   

  end:   // Ack!  I hate using labels!  
   // Now clean it all up...
   LL_Rewind(procs);
   do {
      p = (proc_mem_info *)LL_Get(procs);
      if(p)
      {
         //printf("Proc: %6ik %s\n", p->size, p->name);
         free(p);
      }
   } while(LL_Next(procs) == 0);
   LL_Destroy(procs);


   return 0;
   
} // End mem_top_screen()