/* 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. */ /* getopt not needed */ //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" 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 { } while (0) static unsigned long long scale(unsigned long d) { return ((unsigned long long)d * G.mem_unit) >> G_unit_steps; } 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; 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 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); printf(" %13s%13s%13s%13s%13s\n", "total", "used", "free", "shared", "buffers" /* swap and total don't have these columns */ /* procps version 3.2.8 also shows "cached" column, but * sysinfo() does not provide this value, need to parse * /proc/meminfo instead and get "Cached: NNN kB" from there. */ ); #define FIELDS_5 "%13llu%13llu%13llu%13llu%13llu\n" #define FIELDS_3 (FIELDS_5 + 2*6) #define FIELDS_2 (FIELDS_5 + 3*6) printf("Mem: "); printf(FIELDS_5, scale(info.totalram), scale(info.totalram - info.freeram), scale(info.freeram), scale(info.sharedram), scale(info.bufferram) ); /* Show alternate, more meaningful busy/free numbers by counting * buffer cache as free memory (make it "-/+ buffers/cache" * if/when we add support for "cached" column): */ printf("-/+ buffers: "); printf(FIELDS_2, scale(info.totalram - info.freeram - info.bufferram), scale(info.freeram + info.bufferram) ); #if BB_MMU printf("Swap:"); printf(FIELDS_3, scale(info.totalswap), scale(info.totalswap - info.freeswap), scale(info.freeswap) ); #endif return EXIT_SUCCESS; }