view toys/other/free.c @ 674:7e846e281e38

New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author Rob Landley <>
date Mon, 08 Oct 2012 00:02:30 -0500
parents 6df4ccc0acbe
children 786841fdb1e0
line wrap: on
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/* vi: set sw=4 ts=4:
 * free.c - Display amount of free and used memory in the system.
 * Copyright 2012 Elie De Brauwer <>


config FREE
	bool "free"
	default y
	  usage: free [-bkmg]

	  Display the total, free and used amount of physical memory and
	  swap space.

	  -bkmg    Output in bytes (default), KB, MB or GB

#define FOR_free
#include "toys.h"

static unsigned long long convert(unsigned long d, unsigned int iscale,
				unsigned int oscale)
	return ((unsigned long long)d*iscale)>>oscale;

void free_main(void)
	struct sysinfo info;
	unsigned int iscale = 1;
	unsigned int oscale = 0;

	if (info.mem_unit) iscale = info.mem_unit;
	if (toys.optflags & FLAG_b) oscale = 0;
	if (toys.optflags & FLAG_k) oscale = 10;
	if (toys.optflags & FLAG_m) oscale = 20;
	if (toys.optflags & FLAG_g) oscale = 30;

	xprintf("\t\ttotal        used        free      shared     buffers\n");
		convert(info.totalram, iscale, oscale),
		convert(info.totalram-info.freeram, iscale, oscale),
		convert(info.freeram, iscale, oscale),
		convert(info.sharedram, iscale, oscale),
		convert(info.bufferram, iscale, oscale));

	xprintf("-/+ buffers/cache:%15llu%12llu\n",
		convert(info.totalram - info.freeram - info.bufferram, iscale, oscale),
		convert(info.freeram + info.bufferram, iscale, oscale));

		convert(info.totalswap, iscale, oscale),
		convert(info.totalswap - info.freeswap, iscale, oscale),
		convert(info.freeswap, iscale, oscale));