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/* vi: set sw=4 ts=4: */
/*
* Mini free implementation for busybox
*
* Copyright (C) 1999,2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <stdio.h>
#include <errno.h>
const char free_usage[] =
"free\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nDisplays the amount of free and used system memory\n"
#endif
;
extern int free_main(int argc, char **argv)
{
struct sysinfo info;
sysinfo(&info);
/* Kernels prior to 2.4.x will return info.mem_unit==0. Kernels after
* 2.4.x actually fill this value in */
if (info.mem_unit==0) {
/* Looks like we have a kernel prior to Linux 2.4.x */
info.mem_unit=1024;
info.totalram/=info.mem_unit;
info.freeram/=info.mem_unit;
info.totalswap/=info.mem_unit;
info.freeswap/=info.mem_unit;
info.sharedram/=info.mem_unit;
info.bufferram/=info.mem_unit;
} else {
/* Bah. Linux 2.4.x completely changed sysinfo. This can in theory
overflow a 32 bit unsigned long, but who puts more then 4GiB ram+swap
on an embedded system? */
info.mem_unit/=1024;
info.totalram*=info.mem_unit;
info.freeram*=info.mem_unit;
info.totalswap*=info.mem_unit;
info.freeswap*=info.mem_unit;
info.sharedram*=info.mem_unit;
info.bufferram*=info.mem_unit;
}
if (argc > 1 && **(argv + 1) == '-')
usage(free_usage);
printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
"shared", "buffers");
printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
info.totalram-info.freeram, info.freeram,
info.sharedram, info.bufferram);
printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
info.totalswap-info.freeswap, info.freeswap);
printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
(info.totalram-info.freeram)+(info.totalswap-info.freeswap),
info.freeram+info.freeswap);
return(TRUE);
}
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