LXR toybox/toys/other/free.c

   1/* free.c - Display amount of free and used memory in the system.
   2 *
   3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
   4
   5// Flag order is signifcant: b-g are units in order, FLAG_h-1 is unit mask
   6USE_FREE(NEWTOY(free, "hgmkb[!hgmkb]", TOYFLAG_USR|TOYFLAG_BIN))
   7
   8config FREE
   9  bool "free"
  10  default y
  11  help
  12    usage: free [-bkmgt]
  13
  14    Display the total, free and used amount of physical memory and swap space.
  15
  16    -bkmg       Output units (default is bytes)
  17    -h  Human readable (K=1024)
  18*/
  19
  20#define FOR_free
  21#include "toys.h"
  22
  23GLOBALS(
  24  unsigned bits;
  25  unsigned long long units;
  26  char *buf;
  27)
  28
  29static char *convert(unsigned long d)
  30{
  31  long long ll = d*TT.units;
  32  char *s = TT.buf;
  33
  34  if (FLAG(h)) human_readable(s, ll, 0);
  35  else sprintf(s, "%llu",ll>>TT.bits);
  36  TT.buf += strlen(TT.buf)+1;
  37
  38  return s;
  39}
  40
  41void free_main(void)
  42{
  43  struct sysinfo in;
  44
  45  sysinfo(&in);
  46  TT.units = in.mem_unit ? in.mem_unit : 1;
  47  while ((toys.optflags&(FLAG_h-1)) && !(toys.optflags&(1<<TT.bits))) TT.bits++;
  48  TT.bits *= 10;
  49  TT.buf = toybuf;
  50
  51  xprintf("\t\ttotal        used        free      shared     buffers\n"
  52    "Mem:%17s%12s%12s%12s%12s\n-/+ buffers/cache:%15s%12s\n"
  53    "Swap:%16s%12s%12s\n", convert(in.totalram),
  54    convert(in.totalram-in.freeram), convert(in.freeram), convert(in.sharedram),
  55    convert(in.bufferram), convert(in.totalram - in.freeram - in.bufferram),
  56    convert(in.freeram + in.bufferram), convert(in.totalswap),
  57    convert(in.totalswap - in.freeswap), convert(in.freeswap));
  58}
  59