1 /* vi: set sw=4 ts=4: */
3 * depmod - generate modules.dep
4 * Copyright (c) 2008 Bernhard Reutner-Fischer
5 * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
6 * Copyright (c) 2008 Vladimir Dronnikov
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //config:config DEPMOD
11 //config: bool "depmod"
13 //config: select PLATFORM_LINUX
15 //config: depmod generates modules.dep (and potentially modules.alias
16 //config: and modules.symbols) that contain dependency information
17 //config: for modprobe.
19 //applet:IF_DEPMOD(IF_NOT_MODPROBE_SMALL(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP)))
21 //kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
22 //kbuild:lib-$(CONFIG_DEPMOD) += depmod.o modutils.o
27 #include <sys/utsname.h> /* uname() */
30 * Theory of operation:
31 * - iterate over all modules and record their full path
32 * - iterate over all modules looking for "depends=" entries
33 * for each depends, look through our list of full paths and emit if found
36 static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
37 void *data, int depth UNUSED_PARAM)
39 module_db *modules = data;
43 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
44 size_t len = (64*1024*1024 - 4096);
46 if (strrstr(fname, ".ko") == NULL)
49 image = xmalloc_open_zipped_read_close(fname, &len);
51 e = moddb_get_or_create(modules, bb_get_last_path_component_nostrip(fname));
52 e->name = xstrdup(fname + 2); /* skip "./" */
54 for (ptr = image; ptr < image + len - 10; ptr++) {
55 if (is_prefixed_with(ptr, "depends=")) {
59 for (u = ptr; *u; u++)
62 ptr += string_to_llist(ptr, &e->deps, ",");
63 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
64 && is_prefixed_with(ptr, "alias=")
66 llist_add_to(&e->aliases, xstrdup(ptr + 6));
68 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
69 && is_prefixed_with(ptr, "__ksymtab_")
72 if (is_prefixed_with(ptr, "gpl")
73 || strcmp(ptr, "strings") == 0
77 llist_add_to(&e->symbols, xstrdup(ptr));
86 static void order_dep_list(module_db *modules, module_entry *start, llist_t *add)
91 for (n = add; n != NULL; n = n->link) {
92 m = moddb_get(modules, n->data);
96 /* unlink current entry */
97 m->dnext->dprev = m->dprev;
98 m->dprev->dnext = m->dnext;
100 /* and add it to tail */
102 m->dprev = start->dprev;
103 start->dprev->dnext = m;
107 order_dep_list(modules, start, m->deps);
111 static void xfreopen_write(const char *file, FILE *f)
113 if (freopen(file, "w", f) == NULL)
114 bb_perror_msg_and_die("can't open '%s'", file);
117 //usage:#if !ENABLE_MODPROBE_SMALL
118 //usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
119 //usage:#define depmod_full_usage "\n\n"
120 //usage: "Generate modules.dep, alias, and symbols files"
122 //usage: "\n -b BASE Use BASE/lib/modules/VERSION"
123 //usage: "\n -n Dry run: print files to stdout"
127 * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
129 * Probe all modules. Default if no MODFILES.
131 * Check modules.dep's mtime against module files' mtimes.
133 * Use $BASE/lib/modules/VERSION
134 * -C --config FILE or DIR
135 * Path to /etc/depmod.conf or /etc/depmod.d/
137 * When combined with the -F option, this reports any symbols
138 * which are not supplied by other modules or kernel.
139 * -F --filesyms System.map
141 * Print modules.dep etc to standard output
143 * Print to stdout all the symbols each module depends on
144 * and the module's file name which provides that symbol.
149 * So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]...
150 * Accepted but ignored:
158 //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
159 //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
160 OPT_b = (1 << 2), /* base directory when modules are in staging area */
161 //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
162 //OPT_F = (1 << 4), /* System.map that contains the symbols */
163 OPT_n = (1 << 5), /* dry-run, print to stdout only */
164 OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
165 OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
166 OPT_q = (1 << 8), /* -q,--quiet: ignored */
167 OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
170 int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
171 int depmod_main(int argc UNUSED_PARAM, char **argv)
174 module_entry *m, *dep;
175 const char *moddir_base = "/";
176 char *moddir, *version;
181 getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
184 /* goto modules location */
187 /* If a version is provided, then that kernel version's module directory
188 * is used, rather than the current kernel version (as returned by
190 if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
194 version = uts.release;
196 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
198 if (ENABLE_FEATURE_CLEAN_UP)
202 memset(&modules, 0, sizeof(modules));
205 parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
208 recursive_action(".", ACTION_RECURSE,
209 parse_module, NULL, &modules, 0);
212 /* Generate dependency and alias files */
213 if (!(option_mask32 & OPT_n))
214 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
216 moddb_foreach_module(&modules, m, i) {
217 printf("%s:", m->name);
219 order_dep_list(&modules, m, m->deps);
220 while (m->dnext != m) {
222 printf(" %s", dep->name);
224 /* unlink current entry */
225 dep->dnext->dprev = dep->dprev;
226 dep->dprev->dnext = dep->dnext;
227 dep->dnext = dep->dprev = dep;
232 #if ENABLE_FEATURE_MODUTILS_ALIAS
233 if (!(option_mask32 & OPT_n))
234 xfreopen_write("modules.alias", stdout);
235 moddb_foreach_module(&modules, m, i) {
238 * Last word used to be a basename
239 * (filename with path and .ko.* stripped)
240 * at the time of module-init-tools 3.4.
241 * kmod v.12 uses module name, i.e., s/-/_/g.
243 printf("alias %s %s\n",
244 (char*)llist_pop(&m->aliases),
249 #if ENABLE_FEATURE_MODUTILS_SYMBOLS
250 if (!(option_mask32 & OPT_n))
251 xfreopen_write("modules.symbols", stdout);
252 moddb_foreach_module(&modules, m, i) {
254 printf("alias symbol:%s %s\n",
255 (char*)llist_pop(&m->symbols),
261 if (ENABLE_FEATURE_CLEAN_UP)
262 moddb_free(&modules);