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  * Licensed under the GPL version 2, see the file LICENSE in this tarball.
   8  */
   9
  10 /* getopt not needed */
  11
  12 #include "libbb.h"
  13
  14 int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  15 int free_main(int argc UNUSED_PARAM, char **argv)
  16 {
  17         struct sysinfo info;
  18         unsigned mem_unit;
  19
  20 #if ENABLE_DESKTOP
  21         if (argv[1] && argv[1][0] == '-')
  22                 bb_show_usage();
  23 #endif
  24
  25         sysinfo(&info);
  26
  27         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  28         mem_unit = 1;
  29         if (info.mem_unit != 0) {
  30                 mem_unit = info.mem_unit;
  31         }
  32
  33         /* Convert values to kbytes */
  34         if (mem_unit == 1) {
  35                 info.totalram >>= 10;
  36                 info.freeram >>= 10;
  37 #if BB_MMU
  38                 info.totalswap >>= 10;
  39                 info.freeswap >>= 10;
  40 #endif
  41                 info.sharedram >>= 10;
  42                 info.bufferram >>= 10;
  43         } else {
  44                 mem_unit >>= 10;
  45                 /* TODO:  Make all this stuff not overflow when mem >= 4 Tb */
  46                 info.totalram *= mem_unit;
  47                 info.freeram *= mem_unit;
  48 #if BB_MMU
  49                 info.totalswap *= mem_unit;
  50                 info.freeswap *= mem_unit;
  51 #endif
  52                 info.sharedram *= mem_unit;
  53                 info.bufferram *= mem_unit;
  54         }
  55
  56         printf("      %13s%13s%13s%13s%13s\n",
  57                 "total",
  58                 "used",
  59                 "free",
  60                 "shared", "buffers" /* swap and total don't have these columns */
  61         );
  62         printf("%6s%13lu%13lu%13lu%13lu%13lu\n", "Mem:",
  63                 info.totalram,
  64                 info.totalram - info.freeram,
  65                 info.freeram,
  66                 info.sharedram, info.bufferram
  67         );
  68 #if BB_MMU
  69         printf("%6s%13lu%13lu%13lu\n", "Swap:",
  70                 info.totalswap,
  71                 info.totalswap - info.freeswap,
  72                 info.freeswap
  73         );
  74         printf("%6s%13lu%13lu%13lu\n", "Total:",
  75                 info.totalram + info.totalswap,
  76                 (info.totalram - info.freeram) + (info.totalswap - info.freeswap),
  77                 info.freeram + info.freeswap
  78         );
  79 #endif
  80         return EXIT_SUCCESS;
  81 }