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 | #include "common_bufsiz.h"
|
---|
26 | #ifdef __linux__
|
---|
27 | # include <sys/sysinfo.h>
|
---|
28 | #endif
|
---|
29 |
|
---|
30 | struct globals {
|
---|
31 | unsigned mem_unit;
|
---|
32 | #if ENABLE_DESKTOP
|
---|
33 | unsigned unit_steps;
|
---|
34 | # define G_unit_steps G.unit_steps
|
---|
35 | #else
|
---|
36 | # define G_unit_steps 10
|
---|
37 | #endif
|
---|
38 | } FIX_ALIASING;
|
---|
39 | #define G (*(struct globals*)bb_common_bufsiz1)
|
---|
40 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
|
---|
41 |
|
---|
42 |
|
---|
43 | static unsigned long long scale(unsigned long d)
|
---|
44 | {
|
---|
45 | return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
|
---|
46 | }
|
---|
47 |
|
---|
48 | static unsigned long parse_cached_kb(void)
|
---|
49 | {
|
---|
50 | char buf[60]; /* actual lines we expect are ~30 chars or less */
|
---|
51 | FILE *fp;
|
---|
52 | unsigned long cached = 0;
|
---|
53 |
|
---|
54 | fp = xfopen_for_read("/proc/meminfo");
|
---|
55 | while (fgets(buf, sizeof(buf), fp) != NULL) {
|
---|
56 | if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1)
|
---|
57 | break;
|
---|
58 | }
|
---|
59 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
60 | fclose(fp);
|
---|
61 |
|
---|
62 | return cached;
|
---|
63 | }
|
---|
64 |
|
---|
65 | int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
66 | int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
|
---|
67 | {
|
---|
68 | struct sysinfo info;
|
---|
69 | unsigned long long cached;
|
---|
70 |
|
---|
71 | INIT_G();
|
---|
72 |
|
---|
73 | #if ENABLE_DESKTOP
|
---|
74 | G.unit_steps = 10;
|
---|
75 | if (argv[1] && argv[1][0] == '-') {
|
---|
76 | switch (argv[1][1]) {
|
---|
77 | case 'b':
|
---|
78 | G.unit_steps = 0;
|
---|
79 | break;
|
---|
80 | case 'k': /* 2^10 */
|
---|
81 | /* G.unit_steps = 10; - already is */
|
---|
82 | break;
|
---|
83 | case 'm': /* 2^(2*10) */
|
---|
84 | G.unit_steps = 20;
|
---|
85 | break;
|
---|
86 | case 'g': /* 2^(3*10) */
|
---|
87 | G.unit_steps = 30;
|
---|
88 | break;
|
---|
89 | default:
|
---|
90 | bb_show_usage();
|
---|
91 | }
|
---|
92 | }
|
---|
93 | #endif
|
---|
94 | printf(" %11s%11s%11s%11s%11s%11s\n"
|
---|
95 | "Mem: ",
|
---|
96 | "total",
|
---|
97 | "used",
|
---|
98 | "free",
|
---|
99 | "shared", "buffers", "cached" /* swap and total don't have these columns */
|
---|
100 | );
|
---|
101 |
|
---|
102 | sysinfo(&info);
|
---|
103 | /* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
|
---|
104 | G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
|
---|
105 | /* Extract cached from /proc/meminfo and convert to mem_units */
|
---|
106 | cached = ((unsigned long long) parse_cached_kb() * 1024) / G.mem_unit;
|
---|
107 |
|
---|
108 | #define FIELDS_6 "%11llu%11llu%11llu%11llu%11llu%11llu\n"
|
---|
109 | #define FIELDS_3 (FIELDS_6 + 3*6)
|
---|
110 | #define FIELDS_2 (FIELDS_6 + 4*6)
|
---|
111 |
|
---|
112 | printf(FIELDS_6,
|
---|
113 | scale(info.totalram), //total
|
---|
114 | scale(info.totalram - info.freeram), //used
|
---|
115 | scale(info.freeram), //free
|
---|
116 | scale(info.sharedram), //shared
|
---|
117 | scale(info.bufferram), //buffers
|
---|
118 | scale(cached) //cached
|
---|
119 | );
|
---|
120 | /* Show alternate, more meaningful busy/free numbers by counting
|
---|
121 | * buffer cache as free memory. */
|
---|
122 | printf("-/+ buffers/cache:");
|
---|
123 | cached += info.freeram;
|
---|
124 | cached += info.bufferram;
|
---|
125 | printf(FIELDS_2,
|
---|
126 | scale(info.totalram - cached), //used
|
---|
127 | scale(cached) //free
|
---|
128 | );
|
---|
129 | #if BB_MMU
|
---|
130 | printf("Swap: ");
|
---|
131 | printf(FIELDS_3,
|
---|
132 | scale(info.totalswap), //total
|
---|
133 | scale(info.totalswap - info.freeswap), //used
|
---|
134 | scale(info.freeswap) //free
|
---|
135 | );
|
---|
136 | #endif
|
---|
137 | return EXIT_SUCCESS;
|
---|
138 | }
|
---|