/* 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 */ #include "libbb.h" 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 mem_unit; #if ENABLE_DESKTOP if (argv[1] && argv[1][0] == '-') bb_show_usage(); #endif sysinfo(&info); /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */ mem_unit = 1; if (info.mem_unit != 0) { mem_unit = info.mem_unit; } /* Convert values to kbytes */ if (mem_unit == 1) { info.totalram >>= 10; info.freeram >>= 10; #if BB_MMU info.totalswap >>= 10; info.freeswap >>= 10; #endif info.sharedram >>= 10; info.bufferram >>= 10; } else { mem_unit >>= 10; /* TODO: Make all this stuff not overflow when mem >= 4 Tb */ info.totalram *= mem_unit; info.freeram *= mem_unit; #if BB_MMU info.totalswap *= mem_unit; info.freeswap *= mem_unit; #endif info.sharedram *= mem_unit; info.bufferram *= mem_unit; } 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 "%13lu%13lu%13lu%13lu%13lu\n" #define FIELDS_3 (FIELDS_5 + 2*5) #define FIELDS_2 (FIELDS_5 + 3*5) printf("Mem: "); printf(FIELDS_5, info.totalram, info.totalram - info.freeram, info.freeram, info.sharedram, 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, info.totalram - info.freeram - info.bufferram, info.freeram + info.bufferram ); #if BB_MMU printf("Swap:"); printf(FIELDS_3, info.totalswap, info.totalswap - info.freeswap, info.freeswap ); #endif return EXIT_SUCCESS; }