| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini free implementation for busybox |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| //config:config FREE |
| //config: bool "free" |
| //config: default y |
| //config: select PLATFORM_LINUX #sysinfo() |
| //config: help |
| //config: free displays the total amount of free and used physical and swap |
| //config: memory in the system, as well as the buffers used by the kernel. |
| //config: The shared memory column should be ignored; it is obsolete. |
| |
| //applet:IF_FREE(APPLET(free, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_FREE) += free.o |
| |
| //usage:#define free_trivial_usage |
| //usage: "" IF_DESKTOP("[-b/k/m/g]") |
| //usage:#define free_full_usage "\n\n" |
| //usage: "Display the amount of free and used system memory" |
| //usage: |
| //usage:#define free_example_usage |
| //usage: "$ free\n" |
| //usage: " total used free shared buffers\n" |
| //usage: " Mem: 257628 248724 8904 59644 93124\n" |
| //usage: " Swap: 128516 8404 120112\n" |
| //usage: "Total: 386144 257128 129016\n" |
| |
| #include "libbb.h" |
| #include "common_bufsiz.h" |
| #ifdef __linux__ |
| # include <sys/sysinfo.h> |
| #endif |
| |
| struct globals { |
| unsigned mem_unit; |
| #if ENABLE_DESKTOP |
| unsigned unit_steps; |
| # define G_unit_steps G.unit_steps |
| #else |
| # define G_unit_steps 10 |
| #endif |
| } FIX_ALIASING; |
| #define G (*(struct globals*)bb_common_bufsiz1) |
| #define INIT_G() do { setup_common_bufsiz(); } while (0) |
| |
| |
| static unsigned long long scale(unsigned long d) |
| { |
| return ((unsigned long long)d * G.mem_unit) >> G_unit_steps; |
| } |
| |
| static unsigned long parse_cached_kb(void) |
| { |
| char buf[60]; /* actual lines we expect are ~30 chars or less */ |
| FILE *fp; |
| unsigned long cached = 0; |
| |
| fp = xfopen_for_read("/proc/meminfo"); |
| while (fgets(buf, sizeof(buf), fp) != NULL) { |
| if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1) |
| break; |
| } |
| if (ENABLE_FEATURE_CLEAN_UP) |
| fclose(fp); |
| |
| return cached; |
| } |
| |
| int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM)) |
| { |
| struct sysinfo info; |
| unsigned long long cached; |
| |
| INIT_G(); |
| |
| #if ENABLE_DESKTOP |
| G.unit_steps = 10; |
| if (argv[1] && argv[1][0] == '-') { |
| switch (argv[1][1]) { |
| case 'b': |
| G.unit_steps = 0; |
| break; |
| case 'k': /* 2^10 */ |
| /* G.unit_steps = 10; - already is */ |
| break; |
| case 'm': /* 2^(2*10) */ |
| G.unit_steps = 20; |
| break; |
| case 'g': /* 2^(3*10) */ |
| G.unit_steps = 30; |
| break; |
| default: |
| bb_show_usage(); |
| } |
| } |
| #endif |
| printf(" %11s%11s%11s%11s%11s%11s\n" |
| "Mem: ", |
| "total", |
| "used", |
| "free", |
| "shared", "buffers", "cached" /* swap and total don't have these columns */ |
| ); |
| |
| sysinfo(&info); |
| /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */ |
| G.mem_unit = (info.mem_unit ? info.mem_unit : 1); |
| /* Extract cached from /proc/meminfo and convert to mem_units */ |
| cached = ((unsigned long long) parse_cached_kb() * 1024) / G.mem_unit; |
| |
| #define FIELDS_6 "%11llu%11llu%11llu%11llu%11llu%11llu\n" |
| #define FIELDS_3 (FIELDS_6 + 3*6) |
| #define FIELDS_2 (FIELDS_6 + 4*6) |
| |
| printf(FIELDS_6, |
| scale(info.totalram), //total |
| scale(info.totalram - info.freeram), //used |
| scale(info.freeram), //free |
| scale(info.sharedram), //shared |
| scale(info.bufferram), //buffers |
| scale(cached) //cached |
| ); |
| /* Show alternate, more meaningful busy/free numbers by counting |
| * buffer cache as free memory. */ |
| printf("-/+ buffers/cache:"); |
| cached += info.freeram; |
| cached += info.bufferram; |
| printf(FIELDS_2, |
| scale(info.totalram - cached), //used |
| scale(cached) //free |
| ); |
| #if BB_MMU |
| printf("Swap: "); |
| printf(FIELDS_3, |
| scale(info.totalswap), //total |
| scale(info.totalswap - info.freeswap), //used |
| scale(info.freeswap) //free |
| ); |
| #endif |
| return EXIT_SUCCESS; |
| } |