1 /* vi: set sw=4 ts=4: */
3 * Mini free implementation for busybox
5 * Copyright (C) 1999,2000 by Lineo, inc.
6 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 const char free_usage[] =
30 #ifndef BB_FEATURE_TRIVIAL_HELP
31 "\nDisplays the amount of free and used system memory\n"
35 extern int free_main(int argc, char **argv)
39 /* Kernels prior to 2.4.x will return info.mem_unit==0. Kernels after
40 * 2.4.x actually fill this value in */
41 if (info.mem_unit==0) {
42 /* Looks like we have a kernel prior to Linux 2.4.x */
44 info.totalram/=info.mem_unit;
45 info.freeram/=info.mem_unit;
46 info.totalswap/=info.mem_unit;
47 info.freeswap/=info.mem_unit;
48 info.sharedram/=info.mem_unit;
49 info.bufferram/=info.mem_unit;
51 /* Bah. Linux 2.4.x completely changed sysinfo. This can in theory
52 overflow a 32 bit unsigned long, but who puts more then 4GiB ram+swap
53 on an embedded system? */
55 info.totalram*=info.mem_unit;
56 info.freeram*=info.mem_unit;
57 info.totalswap*=info.mem_unit;
58 info.freeswap*=info.mem_unit;
59 info.sharedram*=info.mem_unit;
60 info.bufferram*=info.mem_unit;
62 if (argc > 1 && **(argv + 1) == '-')
65 printf("%6s%13s%13s%13s%13s%13s\n", "", "total", "used", "free",
68 printf("%6s%13ld%13ld%13ld%13ld%13ld\n", "Mem:", info.totalram,
69 info.totalram-info.freeram, info.freeram,
70 info.sharedram, info.bufferram);
72 printf("%6s%13ld%13ld%13ld\n", "Swap:", info.totalswap,
73 info.totalswap-info.freeswap, info.freeswap);
75 printf("%6s%13ld%13ld%13ld\n", "Total:", info.totalram+info.totalswap,
76 (info.totalram-info.freeram)+(info.totalswap-info.freeswap),
77 info.freeram+info.freeswap);