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.
11 //applet:IF_DEPMOD(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP))
15 #include <sys/utsname.h> /* uname() */
18 * Theory of operation:
19 * - iterate over all modules and record their full path
20 * - iterate over all modules looking for "depends=" entries
21 * for each depends, look through our list of full paths and emit if found
24 static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
25 void *data, int depth UNUSED_PARAM)
27 module_db *modules = data;
31 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
32 size_t len = (64*1024*1024 - 4096);
34 if (strrstr(fname, ".ko") == NULL)
37 image = xmalloc_open_zipped_read_close(fname, &len);
39 e = moddb_get_or_create(modules, bb_get_last_path_component_nostrip(fname));
40 e->name = xstrdup(fname + 2); /* skip "./" */
42 for (ptr = image; ptr < image + len - 10; ptr++) {
43 if (is_prefixed_with(ptr, "depends=")) {
47 for (u = ptr; *u; u++)
50 ptr += string_to_llist(ptr, &e->deps, ",");
51 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
52 && is_prefixed_with(ptr, "alias=")
54 llist_add_to(&e->aliases, xstrdup(ptr + 6));
56 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
57 && is_prefixed_with(ptr, "__ksymtab_")
60 if (is_prefixed_with(ptr, "gpl")
61 || strcmp(ptr, "strings") == 0
65 llist_add_to(&e->symbols, xstrdup(ptr));
74 static void order_dep_list(module_db *modules, module_entry *start, llist_t *add)
79 for (n = add; n != NULL; n = n->link) {
80 m = moddb_get(modules, n->data);
84 /* unlink current entry */
85 m->dnext->dprev = m->dprev;
86 m->dprev->dnext = m->dnext;
88 /* and add it to tail */
90 m->dprev = start->dprev;
91 start->dprev->dnext = m;
95 order_dep_list(modules, start, m->deps);
99 static void xfreopen_write(const char *file, FILE *f)
101 if (freopen(file, "w", f) == NULL)
102 bb_perror_msg_and_die("can't open '%s'", file);
105 //usage:#if !ENABLE_MODPROBE_SMALL
106 //usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
107 //usage:#define depmod_full_usage "\n\n"
108 //usage: "Generate modules.dep, alias, and symbols files"
110 //usage: "\n -b BASE Use BASE/lib/modules/VERSION"
111 //usage: "\n -n Dry run: print files to stdout"
115 * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
117 * Probe all modules. Default if no MODFILES.
119 * Check modules.dep's mtime against module files' mtimes.
121 * Use $BASE/lib/modules/VERSION
122 * -C --config FILE or DIR
123 * Path to /etc/depmod.conf or /etc/depmod.d/
125 * When combined with the -F option, this reports any symbols
126 * which are not supplied by other modules or kernel.
127 * -F --filesyms System.map
129 * Print modules.dep etc to standard output
131 * Print to stdout all the symbols each module depends on
132 * and the module's file name which provides that symbol.
137 * So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]...
138 * Accepted but ignored:
146 //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
147 //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
148 OPT_b = (1 << 2), /* base directory when modules are in staging area */
149 //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
150 //OPT_F = (1 << 4), /* System.map that contains the symbols */
151 OPT_n = (1 << 5), /* dry-run, print to stdout only */
152 OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
153 OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
154 OPT_q = (1 << 8), /* -q,--quiet: ignored */
155 OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
158 int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
159 int depmod_main(int argc UNUSED_PARAM, char **argv)
162 module_entry *m, *dep;
163 const char *moddir_base = "/";
164 char *moddir, *version;
169 getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
172 /* goto modules location */
175 /* If a version is provided, then that kernel version's module directory
176 * is used, rather than the current kernel version (as returned by
178 if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
182 version = uts.release;
184 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
186 if (ENABLE_FEATURE_CLEAN_UP)
190 memset(&modules, 0, sizeof(modules));
193 parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
196 recursive_action(".", ACTION_RECURSE,
197 parse_module, NULL, &modules, 0);
200 /* Generate dependency and alias files */
201 if (!(option_mask32 & OPT_n))
202 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
204 moddb_foreach_module(&modules, m, i) {
205 printf("%s:", m->name);
207 order_dep_list(&modules, m, m->deps);
208 while (m->dnext != m) {
210 printf(" %s", dep->name);
212 /* unlink current entry */
213 dep->dnext->dprev = dep->dprev;
214 dep->dprev->dnext = dep->dnext;
215 dep->dnext = dep->dprev = dep;
220 #if ENABLE_FEATURE_MODUTILS_ALIAS
221 if (!(option_mask32 & OPT_n))
222 xfreopen_write("modules.alias", stdout);
223 moddb_foreach_module(&modules, m, i) {
226 * Last word used to be a basename
227 * (filename with path and .ko.* stripped)
228 * at the time of module-init-tools 3.4.
229 * kmod v.12 uses module name, i.e., s/-/_/g.
231 printf("alias %s %s\n",
232 (char*)llist_pop(&m->aliases),
237 #if ENABLE_FEATURE_MODUTILS_SYMBOLS
238 if (!(option_mask32 & OPT_n))
239 xfreopen_write("modules.symbols", stdout);
240 moddb_foreach_module(&modules, m, i) {
242 printf("alias symbol:%s %s\n",
243 (char*)llist_pop(&m->symbols),
249 if (ENABLE_FEATURE_CLEAN_UP)
250 moddb_free(&modules);