procps/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. and Erik Andersen
   6  * Copyright (C) 1999,2000,2001 by Erik Andersen <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 /* getopt not needed */
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <stdlib.h>
  29 #include "busybox.h"
  30
  31 extern int free_main(int argc, char **argv)
  32 {
  33         struct sysinfo info;
  34         sysinfo(&info);
  35
  36         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  37         if (info.mem_unit==0) {
  38                 info.mem_unit=1;
  39         }
  40         if ( info.mem_unit == 1 ) {
  41                 info.mem_unit=1024;
  42
  43                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  44                 info.totalram/=info.mem_unit;
  45                 info.freeram/=info.mem_unit;
  46 #ifndef __uClinux__
  47                 info.totalswap/=info.mem_unit;
  48                 info.freeswap/=info.mem_unit;
  49 #endif
  50                 info.sharedram/=info.mem_unit;
  51                 info.bufferram/=info.mem_unit;
  52         } else {
  53                 info.mem_unit/=1024;
  54                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  55                 info.totalram*=info.mem_unit;
  56                 info.freeram*=info.mem_unit;
  57 #ifndef __uClinux__
  58                 info.totalswap*=info.mem_unit;
  59                 info.freeswap*=info.mem_unit;
  60 #endif
  61                 info.sharedram*=info.mem_unit;
  62                 info.bufferram*=info.mem_unit;
  63         }
  64
  65         if (argc > 1 && **(argv + 1) == '-')
  66                 bb_show_usage();
  67
  68         printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
  69                         "shared", "buffers");
  70
  71         printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
  72                         info.totalram-info.freeram, info.freeram,
  73                         info.sharedram, info.bufferram);
  74
  75 #ifndef __uClinux__
  76         printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
  77                         info.totalswap-info.freeswap, info.freeswap);
  78
  79         printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
  80                         (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
  81                         info.freeram+info.freeswap);
  82 #endif
  83         return EXIT_SUCCESS;
  84 }
  85