source: branches/3.2/mindi-busybox/procps/free.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 3.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini free implementation for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9
10/* getopt not needed */
11
12//usage:#define free_trivial_usage
13//usage:       "" IF_DESKTOP("[-b/k/m/g]")
14//usage:#define free_full_usage "\n\n"
15//usage:       "Display the amount of free and used system memory"
16//usage:
17//usage:#define free_example_usage
18//usage:       "$ free\n"
19//usage:       "              total         used         free       shared      buffers\n"
20//usage:       "  Mem:       257628       248724         8904        59644        93124\n"
21//usage:       " Swap:       128516         8404       120112\n"
22//usage:       "Total:       386144       257128       129016\n"
23
24#include "libbb.h"
25#ifdef __linux__
26# include <sys/sysinfo.h>
27#endif
28
29struct globals {
30    unsigned mem_unit;
31#if ENABLE_DESKTOP
32    unsigned unit_steps;
33# define G_unit_steps G.unit_steps
34#else
35# define G_unit_steps 10
36#endif
37} FIX_ALIASING;
38#define G (*(struct globals*)&bb_common_bufsiz1)
39#define INIT_G() do { } while (0)
40
41
42static unsigned long long scale(unsigned long d)
43{
44    return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
45}
46
47
48int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
49int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
50{
51    struct sysinfo info;
52
53    INIT_G();
54
55#if ENABLE_DESKTOP
56    G.unit_steps = 10;
57    if (argv[1] && argv[1][0] == '-') {
58        switch (argv[1][1]) {
59        case 'b':
60            G.unit_steps = 0;
61            break;
62        case 'k': /* 2^10 */
63            /* G.unit_steps = 10; - already is */
64            break;
65        case 'm': /* 2^(2*10) */
66            G.unit_steps = 20;
67            break;
68        case 'g': /* 2^(3*10) */
69            G.unit_steps = 30;
70            break;
71        default:
72            bb_show_usage();
73        }
74    }
75#endif
76
77    sysinfo(&info);
78
79    /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
80    G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
81
82    printf("     %13s%13s%13s%13s%13s\n",
83        "total",
84        "used",
85        "free",
86        "shared", "buffers" /* swap and total don't have these columns */
87        /* procps version 3.2.8 also shows "cached" column, but
88         * sysinfo() does not provide this value, need to parse
89         * /proc/meminfo instead and get "Cached: NNN kB" from there.
90         */
91    );
92
93#define FIELDS_5 "%13llu%13llu%13llu%13llu%13llu\n"
94#define FIELDS_3 (FIELDS_5 + 2*6)
95#define FIELDS_2 (FIELDS_5 + 3*6)
96
97    printf("Mem: ");
98    printf(FIELDS_5,
99        scale(info.totalram),
100        scale(info.totalram - info.freeram),
101        scale(info.freeram),
102        scale(info.sharedram),
103        scale(info.bufferram)
104    );
105    /* Show alternate, more meaningful busy/free numbers by counting
106     * buffer cache as free memory (make it "-/+ buffers/cache"
107     * if/when we add support for "cached" column): */
108    printf("-/+ buffers:      ");
109    printf(FIELDS_2,
110        scale(info.totalram - info.freeram - info.bufferram),
111        scale(info.freeram + info.bufferram)
112    );
113#if BB_MMU
114    printf("Swap:");
115    printf(FIELDS_3,
116        scale(info.totalswap),
117        scale(info.totalswap - info.freeswap),
118        scale(info.freeswap)
119    );
120#endif
121    return EXIT_SUCCESS;
122}
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