1 /* vi: set sw=4 ts=4: */
3 * modinfo - retrieve module info
4 * Copyright (c) 2008 Pascal Bellard
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 //config:config MODINFO
9 //config: bool "modinfo"
11 //config: select PLATFORM_LINUX
13 //config: Show information about a Linux Kernel module
15 //applet:IF_MODINFO(APPLET(modinfo, BB_DIR_SBIN, BB_SUID_DROP))
17 //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
20 #include <sys/utsname.h> /* uname() */
24 static const char *const shortcuts[] = {
30 "version", // the rest has no shortcut options
41 OPT_0 = (1 << 0), /* \0 as separator */
42 OPT_F = (1 << 1), /* field name */
43 /* first bits are for -nadlp options, the rest are for
44 * fields not selectable with "shortcut" options
47 OPT_TAGS = ((1 << ARRAY_SIZE(shortcuts)) - 1) << 2,
50 static void display(const char *data, const char *pattern)
52 int flag = option_mask32 >> 1; /* shift out -0 bit */
53 if (flag & (flag-1)) {
54 /* more than one field to show: print "FIELD:" pfx */
55 int n = printf("%s:", pattern);
59 printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
62 static void modinfo(const char *path, const char *version,
67 char *ptr, *the_module;
69 int tags = option_mask32;
72 len = MAXINT(ssize_t);
73 the_module = xmalloc_open_zipped_read_close(path, &len);
77 /* Newer depmod puts relative paths in modules.dep */
78 path = allocated = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
79 the_module = xmalloc_open_zipped_read_close(path, &len);
81 bb_error_msg("module '%s' not found", path);
86 for (j = 1; (1<<j) & (OPT_TAGS|OPT_F); j++) {
93 if ((1<<j) & OPT_TAGS)
94 pattern = shortcuts[j-2];
96 if (strcmp(pattern, shortcuts[0]) == 0) {
97 /* "-n" or "-F filename" */
98 display(path, shortcuts[0]);
106 ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
107 if (ptr == NULL) /* no occurance left, done */
109 after_pattern = is_prefixed_with(ptr, pattern);
110 if (after_pattern && *after_pattern == '=') {
111 /* field prefixes are 0x80 or 0x00 */
112 if ((ptr[-1] & 0x7F) == 0x00) {
113 ptr = after_pattern + 1;
114 display(ptr, pattern);
126 //usage:#define modinfo_trivial_usage
127 //usage: "[-adlpn0] [-F keyword] MODULE"
128 //usage:#define modinfo_full_usage "\n\n"
129 //usage: " -a Shortcut for '-F author'"
130 //usage: "\n -d Shortcut for '-F description'"
131 //usage: "\n -l Shortcut for '-F license'"
132 //usage: "\n -p Shortcut for '-F parm'"
133 ////usage: "\n -n Shortcut for '-F filename'"
134 //usage: "\n -F keyword Keyword to look for"
135 //usage: "\n -0 Separate output with NULs"
136 //usage:#define modinfo_example_usage
137 //usage: "$ modinfo -F vermagic loop\n"
139 int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
140 int modinfo_main(int argc UNUSED_PARAM, char **argv)
143 char name[MODULE_NAME_LEN];
146 char *colon, *tokens[2];
151 opt_complementary = "-1"; /* minimum one param */
152 opts = getopt32(argv, "0F:nadlp", &field);
153 /* If no field selected, show all */
154 if (!(opts & (OPT_TAGS|OPT_F)))
155 option_mask32 |= OPT_TAGS;
159 parser = config_open2(
160 xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
164 while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
165 colon = last_char_is(tokens[0], ':');
169 filename2modname(bb_basename(tokens[0]), name);
170 for (i = 0; argv[i]; i++) {
171 if (fnmatch(argv[i], name, 0) == 0) {
172 modinfo(tokens[0], uts.release, field);
173 argv[i] = (char *) "";
177 if (ENABLE_FEATURE_CLEAN_UP)
178 config_close(parser);
180 for (i = 0; argv[i]; i++) {
182 modinfo(argv[i], uts.release, field);