wmmemfree/mem_linux.c

   1 /*
   2  *  mem_linux.c - get memory status
   3  *
   4  *  Copyright (C) 2003 Draghicioiu Mihai <misuceldestept@go.ro>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 long long int mem_total, mem_used, mem_free, mem_shared, mem_buffers, mem_cached;
  25 long long int swp_total, swp_used, swp_free;
  26
  27 void mem_getfree()
  28 {
  29  FILE *file;
  30  int count;
  31
  32  file = fopen("/proc/meminfo", "r");
  33  if(!file)
  34  {
  35   perror("/proc/meminfo");
  36   exit(1);
  37  }
  38  count = fscanf(file, "MemTotal: %lld kB MemFree: %lld kB "
  39                 "MemAvailable: %*d kB Buffers: %lld kB Cached: %lld kB",
  40                 &mem_total, &mem_free, &mem_buffers, &mem_cached);
  41  if (count != 4) {
  42          mem_total = 1;
  43          mem_free = 1;
  44          mem_buffers = 0;
  45          mem_cached = 0;
  46  }
  47  for (int i = 0; i < 10; i++) {
  48          while (fgetc(file) != '\n') {}
  49  }
  50  count = fscanf(file, "SwapTotal: %lld kB SwapFree: %lld kB",
  51                 &swp_total, &swp_free);
  52  if (count != 2) {
  53          swp_total = 1;
  54          swp_free = 1;
  55  }
  56  fclose(file);
  57  mem_used = mem_total - mem_free;
  58  swp_used = swp_total - swp_free;
  59 }