94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini free implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under the GPL version 2, see the file LICENSE in this tarball.
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*/
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/* getopt not needed */
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#include "libbb.h"
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int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
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{
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struct sysinfo info;
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unsigned mem_unit;
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#if ENABLE_DESKTOP
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if (argv[1] && argv[1][0] == '-')
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bb_show_usage();
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#endif
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sysinfo(&info);
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/* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
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mem_unit = 1;
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if (info.mem_unit != 0) {
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mem_unit = info.mem_unit;
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}
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/* Convert values to kbytes */
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if (mem_unit == 1) {
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info.totalram >>= 10;
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info.freeram >>= 10;
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#if BB_MMU
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info.totalswap >>= 10;
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info.freeswap >>= 10;
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#endif
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info.sharedram >>= 10;
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info.bufferram >>= 10;
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} else {
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mem_unit >>= 10;
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/* TODO: Make all this stuff not overflow when mem >= 4 Tb */
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info.totalram *= mem_unit;
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info.freeram *= mem_unit;
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#if BB_MMU
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info.totalswap *= mem_unit;
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info.freeswap *= mem_unit;
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#endif
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info.sharedram *= mem_unit;
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info.bufferram *= mem_unit;
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}
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printf(" %13s%13s%13s%13s%13s\n",
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"total",
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"used",
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"free",
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"shared", "buffers" /* swap and total don't have these columns */
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/* procps version 3.2.8 also shows "cached" column, but
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* sysinfo() does not provide this value, need to parse
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* /proc/meminfo instead and get "Cached: NNN kB" from there.
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*/
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);
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#define FIELDS_5 "%13lu%13lu%13lu%13lu%13lu\n"
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#define FIELDS_3 (FIELDS_5 + 2*5)
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#define FIELDS_2 (FIELDS_5 + 3*5)
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printf("Mem: ");
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printf(FIELDS_5,
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info.totalram,
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info.totalram - info.freeram,
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info.freeram,
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info.sharedram, info.bufferram
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);
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/* Show alternate, more meaningful busy/free numbers by counting
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* buffer cache as free memory (make it "-/+ buffers/cache"
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* if/when we add support for "cached" column): */
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printf("-/+ buffers: ");
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printf(FIELDS_2,
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info.totalram - info.freeram - info.bufferram,
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info.freeram + info.bufferram
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);
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#if BB_MMU
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printf("Swap:");
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printf(FIELDS_3,
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info.totalswap,
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info.totalswap - info.freeswap,
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info.freeswap
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);
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#endif
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return EXIT_SUCCESS;
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}
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