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/* free.c - Display amount of free and used memory in the system.
* Copyright 2012 Elie De Brauwer <>
// Flag order is signifcant: b-t are units in order, FLAG_h-1 is unit mask
USE_FREE(NEWTOY(free, "htgmkb[!htgmkb]", TOYFLAG_USR|TOYFLAG_BIN))
config FREE
bool "free"
default y
usage: free [-bkmgt]
Display the total, free and used amount of physical memory and swap space.
-bkmgt Output units (default is bytes)
-h Human readable
#define FOR_free
#include "toys.h"
unsigned bits;
unsigned long long units;
char *buf;
static char *convert(unsigned long d)
long long ll = d*TT.units;
char *s = TT.buf;
if (toys.optflags & FLAG_h) human_readable(s, ll, 0);
else sprintf(s, "%llu",ll>>TT.bits);
TT.buf += strlen(TT.buf)+1;
return s;
void free_main(void)
struct sysinfo in;
TT.units = in.mem_unit ? in.mem_unit : 1;
while ((toys.optflags&(FLAG_h-1)) && !(toys.optflags&(1<<TT.bits))) TT.bits++;
TT.bits *= 10;
TT.buf = toybuf;
xprintf("\t\ttotal used free shared buffers\n"
"Mem:%17s%12s%12s%12s%12s\n-/+ buffers/cache:%15s%12s\n"
"Swap:%16s%12s%12s\n", convert(in.totalram),
convert(in.totalram-in.freeram), convert(in.freeram), convert(in.sharedram),
convert(in.bufferram), convert(in.totalram - in.freeram - in.bufferram),
convert(in.freeram + in.bufferram), convert(in.totalswap),
convert(in.totalswap - in.freeswap), convert(in.freeswap));