free.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini free implementation for busybox
   4  *
   5  * Copyright (C) 1999,2000 by Lineo, inc.
   6  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 #include "busybox.h"
  25 #include <stdio.h>
  26 #include <errno.h>
  27
  28 extern int free_main(int argc, char **argv)
  29 {
  30         struct sysinfo info;
  31         sysinfo(&info);
  32
  33         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  34         if (info.mem_unit==0) {
  35                 info.mem_unit=1;
  36         }
  37         info.mem_unit*=1024;
  38
  39         /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  40         info.totalram/=info.mem_unit;
  41         info.freeram/=info.mem_unit;
  42         info.totalswap/=info.mem_unit;
  43         info.freeswap/=info.mem_unit;
  44         info.sharedram/=info.mem_unit;
  45         info.bufferram/=info.mem_unit;
  46
  47         if (argc > 1 && **(argv + 1) == '-')
  48                 usage(free_usage);
  49
  50         printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
  51                         "shared", "buffers");
  52
  53         printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
  54                         info.totalram-info.freeram, info.freeram,
  55                         info.sharedram, info.bufferram);
  56
  57         printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
  58                         info.totalswap-info.freeswap, info.freeswap);
  59
  60         printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
  61                         (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
  62                         info.freeram+info.freeswap);
  63         return EXIT_SUCCESS;
  64 }
  65
  66