Start 1.33.0 development cycle
[oweals/busybox.git] / modutils / lsmod.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini lsmod implementation for busybox
4  *
5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6  * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7  *
8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9  */
10 //config:config LSMOD
11 //config:       bool "lsmod (1.9 kb)"
12 //config:       default y
13 //config:       select PLATFORM_LINUX
14 //config:       help
15 //config:       lsmod is used to display a list of loaded modules.
16 //config:
17 //config:config FEATURE_LSMOD_PRETTY_2_6_OUTPUT
18 //config:       bool "Pretty output"
19 //config:       default y
20 //config:       depends on LSMOD && !MODPROBE_SMALL
21 //config:       help
22 //config:       This option makes output format of lsmod adjusted to
23 //config:       the format of module-init-tools for Linux kernel 2.6.
24 //config:       Increases size somewhat.
25
26 //applet:IF_LSMOD(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(lsmod, lsmod, BB_DIR_SBIN, BB_SUID_DROP, lsmod)))
27
28 //kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
29 //kbuild:lib-$(CONFIG_LSMOD) += lsmod.o modutils.o
30 //kbuild:endif
31
32 //usage:#if !ENABLE_MODPROBE_SMALL
33 //usage:#define lsmod_trivial_usage
34 //usage:       ""
35 //usage:#define lsmod_full_usage "\n\n"
36 //usage:       "List loaded kernel modules"
37 //usage:#endif
38
39 #include "libbb.h"
40 #include "unicode.h"
41
42 #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
43 enum {
44         TAINT_PROPRIETORY_MODULE = (1 << 0),
45         TAINT_FORCED_MODULE      = (1 << 1),
46         TAINT_UNSAFE_SMP         = (1 << 2),
47 };
48
49 static void check_tainted(void)
50 {
51         int tainted = 0;
52         char *buf = xmalloc_open_read_close("/proc/sys/kernel/tainted", NULL);
53         if (buf) {
54                 tainted = atoi(buf);
55                 if (ENABLE_FEATURE_CLEAN_UP)
56                         free(buf);
57         }
58
59         if (tainted) {
60                 printf("    Tainted: %c%c%c\n",
61                                 tainted & TAINT_PROPRIETORY_MODULE      ? 'P' : 'G',
62                                 tainted & TAINT_FORCED_MODULE           ? 'F' : ' ',
63                                 tainted & TAINT_UNSAFE_SMP              ? 'S' : ' ');
64         } else {
65                 puts("    Not tainted");
66         }
67 }
68 #else
69 static ALWAYS_INLINE void check_tainted(void)
70 {
71         putchar('\n');
72 }
73 #endif
74
75 int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
76 int lsmod_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
77 {
78 #if ENABLE_FEATURE_LSMOD_PRETTY_2_6_OUTPUT
79         char *token[4];
80         parser_t *parser = config_open("/proc/modules");
81         init_unicode();
82
83         printf("%-24sSize  Used by", "Module");
84         check_tainted();
85
86         if (ENABLE_FEATURE_2_4_MODULES
87          && get_linux_version_code() < KERNEL_VERSION(2,6,0)
88         ) {
89                 while (config_read(parser, token, 4, 3, "# \t", PARSE_NORMAL)) {
90                         if (token[3] != NULL && token[3][0] == '[') {
91                                 token[3]++;
92                                 token[3][strlen(token[3])-1] = '\0';
93                         } else
94                                 token[3] = (char *) "";
95 # if ENABLE_UNICODE_SUPPORT
96                         {
97                                 uni_stat_t uni_stat;
98                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
99                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
100                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
101                                 free(uni_name);
102                         }
103 # else
104                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
105 # endif
106                 }
107         } else {
108                 while (config_read(parser, token, 4, 4, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
109                         // N.B. token[3] is either '-' (module is not used by others)
110                         // or comma-separated list ended by comma
111                         // so trimming the trailing char is just what we need!
112                         if (token[3][0])
113                                 token[3][strlen(token[3]) - 1] = '\0';
114 # if ENABLE_UNICODE_SUPPORT
115                         {
116                                 uni_stat_t uni_stat;
117                                 char *uni_name = unicode_conv_to_printable(&uni_stat, token[0]);
118                                 unsigned pad_len = (uni_stat.unicode_width > 19) ? 0 : 19 - uni_stat.unicode_width;
119                                 printf("%s%*s %8s %2s %s\n", uni_name, pad_len, "", token[1], token[2], token[3]);
120                                 free(uni_name);
121                         }
122 # else
123                         printf("%-19s %8s %2s %s\n", token[0], token[1], token[2], token[3]);
124 # endif
125                 }
126         }
127         if (ENABLE_FEATURE_CLEAN_UP)
128                 config_close(parser);
129 #else
130         check_tainted();
131         xprint_and_close_file(xfopen_for_read("/proc/modules"));
132 #endif
133         return EXIT_SUCCESS;
134 }