userapps/opensource/busybox/procps/free.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini free implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  */
  22
  23 /* getopt not needed */
  24
  25 #include <stdio.h>
  26 #include <errno.h>
  27 #include <stdlib.h>
  28 #include "busybox.h"
  29
  30 extern int free_main(int argc, char **argv)
  31 {
  32         struct sysinfo info;
  33         sysinfo(&info);
  34
  35         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  36         if (info.mem_unit==0) {
  37                 info.mem_unit=1;
  38         }
  39         if ( info.mem_unit == 1 ) {
  40                 info.mem_unit=1024;
  41
  42                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  43                 info.totalram/=info.mem_unit;
  44                 info.freeram/=info.mem_unit;
  45 #ifndef __uClinux__
  46                 info.totalswap/=info.mem_unit;
  47                 info.freeswap/=info.mem_unit;
  48 #endif
  49                 info.sharedram/=info.mem_unit;
  50                 info.bufferram/=info.mem_unit;
  51         } else {
  52                 info.mem_unit/=1024;
  53                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  54                 info.totalram*=info.mem_unit;
  55                 info.freeram*=info.mem_unit;
  56 #ifndef __uClinux__
  57                 info.totalswap*=info.mem_unit;
  58                 info.freeswap*=info.mem_unit;
  59 #endif
  60                 info.sharedram*=info.mem_unit;
  61                 info.bufferram*=info.mem_unit;
  62         }
  63
  64         if (argc > 1 && **(argv + 1) == '-')
  65                 bb_show_usage();
  66
  67         printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
  68                         "shared", "buffers");
  69
  70         printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
  71                         info.totalram-info.freeram, info.freeram,
  72                         info.sharedram, info.bufferram);
  73
  74 #ifndef __uClinux__
  75         printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
  76                         info.totalswap-info.freeswap, info.freeswap);
  77
  78         printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
  79                         (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
  80                         info.freeram+info.freeswap);
  81 #endif
  82         return EXIT_SUCCESS;
  83 }
  84