u-tools/apps/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  * 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, char **argv)
  16 {
  17         struct sysinfo info;
  18         sysinfo(&info);
  19
  20         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  21         if (info.mem_unit == 0) {
  22                 info.mem_unit=1;
  23         }
  24         if (info.mem_unit == 1) {
  25                 info.mem_unit=1024;
  26
  27                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  28                 info.totalram/=info.mem_unit;
  29                 info.freeram/=info.mem_unit;
  30 #ifndef __uClinux__
  31                 info.totalswap/=info.mem_unit;
  32                 info.freeswap/=info.mem_unit;
  33 #endif
  34                 info.sharedram/=info.mem_unit;
  35                 info.bufferram/=info.mem_unit;
  36         } else {
  37                 info.mem_unit/=1024;
  38                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  39                 info.totalram*=info.mem_unit;
  40                 info.freeram*=info.mem_unit;
  41 #ifndef __uClinux__
  42                 info.totalswap*=info.mem_unit;
  43                 info.freeswap*=info.mem_unit;
  44 #endif
  45                 info.sharedram*=info.mem_unit;
  46                 info.bufferram*=info.mem_unit;
  47         }
  48
  49         if (argc > 1 && *argv[1] == '-')
  50                 bb_show_usage();
  51
  52         printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
  53                         "shared", "buffers");
  54
  55         printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
  56                         info.totalram-info.freeram, info.freeram,
  57                         info.sharedram, info.bufferram);
  58
  59 #ifndef __uClinux__
  60         printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
  61                         info.totalswap-info.freeswap, info.freeswap);
  62
  63         printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
  64                         (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
  65                         info.freeram+info.freeswap);
  66 #endif
  67         return EXIT_SUCCESS;
  68 }