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 v2 or later, see the file LICENSE in this tarball.
   8  */
   9
  10 /* getopt not needed */
  11
  12 #include "busybox.h"
  13 #include <stdio.h>
  14 #include <errno.h>
  15 #include <stdlib.h>
  16
  17 int free_main(int argc, char **argv)
  18 {
  19         struct sysinfo info;
  20         sysinfo(&info);
  21
  22         /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
  23         if (info.mem_unit==0) {
  24                 info.mem_unit=1;
  25         }
  26         if ( info.mem_unit == 1 ) {
  27                 info.mem_unit=1024;
  28
  29                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  30                 info.totalram/=info.mem_unit;
  31                 info.freeram/=info.mem_unit;
  32 #ifndef __uClinux__
  33                 info.totalswap/=info.mem_unit;
  34                 info.freeswap/=info.mem_unit;
  35 #endif
  36                 info.sharedram/=info.mem_unit;
  37                 info.bufferram/=info.mem_unit;
  38         } else {
  39                 info.mem_unit/=1024;
  40                 /* TODO:  Make all this stuff not overflow when mem >= 4 Gib */
  41                 info.totalram*=info.mem_unit;
  42                 info.freeram*=info.mem_unit;
  43 #ifndef __uClinux__
  44                 info.totalswap*=info.mem_unit;
  45                 info.freeswap*=info.mem_unit;
  46 #endif
  47                 info.sharedram*=info.mem_unit;
  48                 info.bufferram*=info.mem_unit;
  49         }
  50
  51         if (argc > 1 && **(argv + 1) == '-')
  52                 bb_show_usage();
  53
  54         printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
  55                         "shared", "buffers");
  56
  57         printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
  58                         info.totalram-info.freeram, info.freeram,
  59                         info.sharedram, info.bufferram);
  60
  61 #ifndef __uClinux__
  62         printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
  63                         info.totalswap-info.freeswap, info.freeswap);
  64
  65         printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
  66                         (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
  67                         info.freeram+info.freeswap);
  68 #endif
  69         return EXIT_SUCCESS;
  70 }
  71