[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini free implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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| 10 | /* getopt not needed */
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| 11 |
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[3232] | 12 | //usage:#define free_trivial_usage
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| 13 | //usage: "" IF_DESKTOP("[-b/k/m/g]")
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| 14 | //usage:#define free_full_usage "\n\n"
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| 15 | //usage: "Display the amount of free and used system memory"
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| 16 | //usage:
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| 17 | //usage:#define free_example_usage
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| 18 | //usage: "$ free\n"
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| 19 | //usage: " total used free shared buffers\n"
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| 20 | //usage: " Mem: 257628 248724 8904 59644 93124\n"
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| 21 | //usage: " Swap: 128516 8404 120112\n"
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| 22 | //usage: "Total: 386144 257128 129016\n"
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| 23 |
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[1765] | 24 | #include "libbb.h"
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[3621] | 25 | #include "common_bufsiz.h"
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[3232] | 26 | #ifdef __linux__
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| 27 | # include <sys/sysinfo.h>
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| 28 | #endif
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[821] | 29 |
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[2725] | 30 | struct globals {
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| 31 | unsigned mem_unit;
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| 32 | #if ENABLE_DESKTOP
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| 33 | unsigned unit_steps;
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| 34 | # define G_unit_steps G.unit_steps
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| 35 | #else
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| 36 | # define G_unit_steps 10
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| 37 | #endif
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[3232] | 38 | } FIX_ALIASING;
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[3621] | 39 | #define G (*(struct globals*)bb_common_bufsiz1)
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| 40 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
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[2725] | 41 |
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| 42 |
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| 43 | static unsigned long long scale(unsigned long d)
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[821] | 44 | {
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[2725] | 45 | return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
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| 46 | }
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| 47 |
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[3621] | 48 | static unsigned long parse_cached_kb(void)
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| 49 | {
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| 50 | char buf[60]; /* actual lines we expect are ~30 chars or less */
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| 51 | FILE *fp;
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| 52 | unsigned long cached = 0;
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[2725] | 53 |
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[3621] | 54 | fp = xfopen_for_read("/proc/meminfo");
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| 55 | while (fgets(buf, sizeof(buf), fp) != NULL) {
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| 56 | if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1)
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| 57 | break;
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| 58 | }
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| 59 | if (ENABLE_FEATURE_CLEAN_UP)
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| 60 | fclose(fp);
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| 61 |
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| 62 | return cached;
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| 63 | }
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| 64 |
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[2725] | 65 | int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 66 | int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
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| 67 | {
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[821] | 68 | struct sysinfo info;
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[3621] | 69 | unsigned long long cached;
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[821] | 70 |
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[2725] | 71 | INIT_G();
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| 72 |
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| 73 | #if ENABLE_DESKTOP
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| 74 | G.unit_steps = 10;
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| 75 | if (argv[1] && argv[1][0] == '-') {
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| 76 | switch (argv[1][1]) {
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| 77 | case 'b':
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| 78 | G.unit_steps = 0;
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| 79 | break;
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| 80 | case 'k': /* 2^10 */
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| 81 | /* G.unit_steps = 10; - already is */
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| 82 | break;
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| 83 | case 'm': /* 2^(2*10) */
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| 84 | G.unit_steps = 20;
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| 85 | break;
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| 86 | case 'g': /* 2^(3*10) */
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| 87 | G.unit_steps = 30;
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| 88 | break;
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| 89 | default:
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| 90 | bb_show_usage();
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| 91 | }
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[821] | 92 | }
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| 93 | #endif
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[3621] | 94 | printf(" %11s%11s%11s%11s%11s%11s\n"
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| 95 | "Mem: ",
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| 96 | "total",
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| 97 | "used",
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| 98 | "free",
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| 99 | "shared", "buffers", "cached" /* swap and total don't have these columns */
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| 100 | );
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[821] | 101 |
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[2725] | 102 | sysinfo(&info);
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| 103 | /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
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| 104 | G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
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[3621] | 105 | /* Extract cached from /proc/meminfo and convert to mem_units */
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| 106 | cached = ((unsigned long long) parse_cached_kb() * 1024) / G.mem_unit;
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[821] | 107 |
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[3621] | 108 | #define FIELDS_6 "%11llu%11llu%11llu%11llu%11llu%11llu\n"
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| 109 | #define FIELDS_3 (FIELDS_6 + 3*6)
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| 110 | #define FIELDS_2 (FIELDS_6 + 4*6)
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[821] | 111 |
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[3621] | 112 | printf(FIELDS_6,
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| 113 | scale(info.totalram), //total
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| 114 | scale(info.totalram - info.freeram), //used
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| 115 | scale(info.freeram), //free
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| 116 | scale(info.sharedram), //shared
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| 117 | scale(info.bufferram), //buffers
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| 118 | scale(cached) //cached
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[2725] | 119 | );
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| 120 | /* Show alternate, more meaningful busy/free numbers by counting
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[3621] | 121 | * buffer cache as free memory. */
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| 122 | printf("-/+ buffers/cache:");
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| 123 | cached += info.freeram;
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| 124 | cached += info.bufferram;
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[2725] | 125 | printf(FIELDS_2,
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[3621] | 126 | scale(info.totalram - cached), //used
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| 127 | scale(cached) //free
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[2725] | 128 | );
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| 129 | #if BB_MMU
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[3621] | 130 | printf("Swap: ");
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[2725] | 131 | printf(FIELDS_3,
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[3621] | 132 | scale(info.totalswap), //total
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| 133 | scale(info.totalswap - info.freeswap), //used
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| 134 | scale(info.freeswap) //free
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[2725] | 135 | );
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[821] | 136 | #endif
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| 137 | return EXIT_SUCCESS;
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| 138 | }
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