LXR 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
  14int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  15int 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}
  69