149 lines
4.0 KiB
C
149 lines
4.0 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 GPLv2, see file LICENSE in this source tree.
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*/
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//config:config FREE
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//config: bool "free (2.4 kb)"
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//config: default y
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//config: select PLATFORM_LINUX #sysinfo()
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//config: help
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//config: free displays the total amount of free and used physical and swap
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//config: memory in the system, as well as the buffers used by the kernel.
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//config: The shared memory column should be ignored; it is obsolete.
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//applet:IF_FREE(APPLET(free, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_FREE) += free.o
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//usage:#define free_trivial_usage
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//usage: "" IF_DESKTOP("[-b/k/m/g]")
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//usage:#define free_full_usage "\n\n"
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//usage: "Display the amount of free and used system memory"
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//usage:
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//usage:#define free_example_usage
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//usage: "$ free\n"
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//usage: " total used free shared buffers\n"
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//usage: " Mem: 257628 248724 8904 59644 93124\n"
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//usage: " Swap: 128516 8404 120112\n"
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//usage: "Total: 386144 257128 129016\n"
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#include "libbb.h"
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#include "common_bufsiz.h"
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#ifdef __linux__
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# include <sys/sysinfo.h>
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#endif
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struct globals {
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unsigned mem_unit;
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#if ENABLE_DESKTOP
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unsigned unit_steps;
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# define G_unit_steps G.unit_steps
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#else
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# define G_unit_steps 10
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#endif
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} FIX_ALIASING;
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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static unsigned long long scale(unsigned long d)
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{
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return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
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}
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static unsigned long parse_cached_kb(void)
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{
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char buf[60]; /* actual lines we expect are ~30 chars or less */
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FILE *fp;
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unsigned long cached = 0;
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fp = xfopen_for_read("/proc/meminfo");
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1)
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break;
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(fp);
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return cached;
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}
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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 long long cached;
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INIT_G();
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#if ENABLE_DESKTOP
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G.unit_steps = 10;
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if (argv[1] && argv[1][0] == '-') {
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switch (argv[1][1]) {
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case 'b':
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G.unit_steps = 0;
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break;
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case 'k': /* 2^10 */
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/* G.unit_steps = 10; - already is */
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break;
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case 'm': /* 2^(2*10) */
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G.unit_steps = 20;
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break;
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case 'g': /* 2^(3*10) */
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G.unit_steps = 30;
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break;
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default:
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bb_show_usage();
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}
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}
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#endif
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printf(" %11s%11s%11s%11s%11s%11s\n"
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"Mem: ",
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"total",
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"used",
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"free",
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"shared", "buffers", "cached" /* swap and total don't have these columns */
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);
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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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G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
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/* Extract cached from /proc/meminfo and convert to mem_units */
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cached = ((unsigned long long) parse_cached_kb() * 1024) / G.mem_unit;
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#define FIELDS_6 "%11llu%11llu%11llu%11llu%11llu%11llu\n"
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#define FIELDS_3 (FIELDS_6 + 3*6)
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#define FIELDS_2 (FIELDS_6 + 4*6)
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printf(FIELDS_6,
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scale(info.totalram), //total
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scale(info.totalram - info.freeram), //used
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scale(info.freeram), //free
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scale(info.sharedram), //shared
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scale(info.bufferram), //buffers
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scale(cached) //cached
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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. */
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printf("-/+ buffers/cache:");
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cached += info.freeram;
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cached += info.bufferram;
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printf(FIELDS_2,
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scale(info.totalram - cached), //used
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scale(cached) //free
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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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scale(info.totalswap), //total
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scale(info.totalswap - info.freeswap), //used
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scale(info.freeswap) //free
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);
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#endif
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return EXIT_SUCCESS;
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}
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