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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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* getopt not needed */
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11 |
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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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24 | #include "libbb.h"
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25 | #ifdef __linux__
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26 | # include <sys/sysinfo.h>
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27 | #endif
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28 |
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29 | struct globals {
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30 | unsigned mem_unit;
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31 | #if ENABLE_DESKTOP
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32 | unsigned unit_steps;
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33 | # define G_unit_steps G.unit_steps
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34 | #else
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35 | # define G_unit_steps 10
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36 | #endif
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37 | } FIX_ALIASING;
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38 | #define G (*(struct globals*)&bb_common_bufsiz1)
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39 | #define INIT_G() do { } while (0)
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40 |
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41 |
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42 | static unsigned long long scale(unsigned long d)
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43 | {
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44 | return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
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45 | }
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46 |
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47 |
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48 | int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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49 | int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
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50 | {
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51 | struct sysinfo info;
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52 |
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53 | INIT_G();
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54 |
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55 | #if ENABLE_DESKTOP
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56 | G.unit_steps = 10;
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57 | if (argv[1] && argv[1][0] == '-') {
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58 | switch (argv[1][1]) {
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59 | case 'b':
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60 | G.unit_steps = 0;
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61 | break;
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62 | case 'k': /* 2^10 */
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63 | /* G.unit_steps = 10; - already is */
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64 | break;
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65 | case 'm': /* 2^(2*10) */
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66 | G.unit_steps = 20;
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67 | break;
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68 | case 'g': /* 2^(3*10) */
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69 | G.unit_steps = 30;
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70 | break;
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71 | default:
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72 | bb_show_usage();
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73 | }
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74 | }
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75 | #endif
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76 |
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77 | sysinfo(&info);
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78 |
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79 | /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
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80 | G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
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81 |
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82 | printf(" %13s%13s%13s%13s%13s\n",
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83 | "total",
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84 | "used",
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85 | "free",
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86 | "shared", "buffers" /* swap and total don't have these columns */
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87 | /* procps version 3.2.8 also shows "cached" column, but
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88 | * sysinfo() does not provide this value, need to parse
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89 | * /proc/meminfo instead and get "Cached: NNN kB" from there.
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90 | */
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91 | );
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92 |
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93 | #define FIELDS_5 "%13llu%13llu%13llu%13llu%13llu\n"
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94 | #define FIELDS_3 (FIELDS_5 + 2*6)
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95 | #define FIELDS_2 (FIELDS_5 + 3*6)
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96 |
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97 | printf("Mem: ");
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98 | printf(FIELDS_5,
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99 | scale(info.totalram),
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100 | scale(info.totalram - info.freeram),
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101 | scale(info.freeram),
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102 | scale(info.sharedram),
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103 | scale(info.bufferram)
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104 | );
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105 | /* Show alternate, more meaningful busy/free numbers by counting
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106 | * buffer cache as free memory (make it "-/+ buffers/cache"
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107 | * if/when we add support for "cached" column): */
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108 | printf("-/+ buffers: ");
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109 | printf(FIELDS_2,
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110 | scale(info.totalram - info.freeram - info.bufferram),
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111 | scale(info.freeram + info.bufferram)
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112 | );
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113 | #if BB_MMU
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114 | printf("Swap:");
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115 | printf(FIELDS_3,
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116 | scale(info.totalswap),
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117 | scale(info.totalswap - info.freeswap),
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118 | scale(info.freeswap)
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119 | );
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120 | #endif
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121 | return EXIT_SUCCESS;
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122 | }
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