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 typedef struct module_info {
25 struct module_info *next;
27 llist_t *dependencies;
30 struct module_info *dnext, *dprev;
33 static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
34 void *data, int depth UNUSED_PARAM)
36 char modname[MODULE_NAME_LEN];
37 module_info **first = (module_info **) data;
40 /* Arbitrary. Was sb->st_size, but that breaks .gz etc */
41 size_t len = (64*1024*1024 - 4096);
43 if (strrstr(fname, ".ko") == NULL)
46 image = xmalloc_open_zipped_read_close(fname, &len);
47 info = xzalloc(sizeof(*info));
52 info->dnext = info->dprev = info;
53 info->name = xstrdup(fname + 2); /* skip "./" */
54 info->modname = xstrdup(filename2modname(fname, modname));
55 for (ptr = image; ptr < image + len - 10; ptr++) {
56 if (strncmp(ptr, "depends=", 8) == 0) {
60 for (u = ptr; *u; u++)
63 ptr += string_to_llist(ptr, &info->dependencies, ",");
64 } else if (ENABLE_FEATURE_MODUTILS_ALIAS
65 && strncmp(ptr, "alias=", 6) == 0
67 llist_add_to(&info->aliases, xstrdup(ptr + 6));
69 } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS
70 && strncmp(ptr, "__ksymtab_", 10) == 0
73 if (strncmp(ptr, "gpl", 3) == 0
74 || strcmp(ptr, "strings") == 0
78 llist_add_to(&info->symbols, xstrdup(ptr));
87 static module_info *find_module(module_info *modules, const char *modname)
91 for (m = modules; m != NULL; m = m->next)
92 if (strcmp(m->modname, modname) == 0)
97 static void order_dep_list(module_info *modules, module_info *start,
103 for (n = add; n != NULL; n = n->link) {
104 m = find_module(modules, n->data);
108 /* unlink current entry */
109 m->dnext->dprev = m->dprev;
110 m->dprev->dnext = m->dnext;
112 /* and add it to tail */
114 m->dprev = start->dprev;
115 start->dprev->dnext = m;
119 order_dep_list(modules, start, m->dependencies);
123 static void xfreopen_write(const char *file, FILE *f)
125 if (freopen(file, "w", f) == NULL)
126 bb_perror_msg_and_die("can't open '%s'", file);
130 * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
132 * Probe all modules. Default if no MODFILES.
134 * Check modules.dep's mtime against module files' mtimes.
136 * Use $BASE/lib/modules/VERSION
137 * -C --config FILE or DIR
138 * Path to /etc/depmod.conf or /etc/depmod.d/
140 * When combined with the -F option, this reports any symbols which
141 * which are not supplied by other modules or kernel.
142 * -F --filesyms System.map
144 * Print modules.dep etc to standard output
146 * Print to stdout all the symbols each module depends on
147 * and the module's file name which provides that symbol.
150 * So far we only support: [-rn] [-b BASE] [VERSION] [MODFILES]...
151 * -aAeF are accepted but ignored. -vC are not accepted.
154 //OPT_a = (1 << 0), /* All modules, ignore mods in argv */
155 //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
156 OPT_b = (1 << 2), /* base directory when modules are in staging area */
157 //OPT_e = (1 << 3), /* with -F, print unresolved symbols */
158 //OPT_F = (1 << 4), /* System.map that contains the symbols */
159 OPT_n = (1 << 5), /* dry-run, print to stdout only */
160 OPT_r = (1 << 6) /* Compat dummy. Linux Makefile uses it */
163 int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
164 int depmod_main(int argc UNUSED_PARAM, char **argv)
166 module_info *modules, *m, *dep;
167 const char *moddir_base = "/";
168 char *moddir, *version;
172 getopt32(argv, "aAb:eF:nr", &moddir_base, NULL);
175 /* goto modules location */
178 /* If a version is provided, then that kernel version's module directory
179 * is used, rather than the current kernel version (as returned by
181 if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
185 version = uts.release;
187 moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
189 if (ENABLE_FEATURE_CLEAN_UP)
196 parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
199 recursive_action(".", ACTION_RECURSE,
200 parse_module, NULL, &modules, 0);
203 /* Generate dependency and alias files */
204 if (!(option_mask32 & OPT_n))
205 xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout);
206 for (m = modules; m != NULL; m = m->next) {
207 printf("%s:", m->name);
209 order_dep_list(modules, m, m->dependencies);
210 while (m->dnext != m) {
212 printf(" %s", dep->name);
214 /* unlink current entry */
215 dep->dnext->dprev = dep->dprev;
216 dep->dprev->dnext = dep->dnext;
217 dep->dnext = dep->dprev = dep;
222 #if ENABLE_FEATURE_MODUTILS_ALIAS
223 if (!(option_mask32 & OPT_n))
224 xfreopen_write("modules.alias", stdout);
225 for (m = modules; m != NULL; m = m->next) {
226 const char *fname = bb_basename(m->name);
227 int fnlen = strchrnul(fname, '.') - fname;
229 /* Last word can well be m->modname instead,
230 * but depmod from module-init-tools 3.4
231 * uses module basename, i.e., no s/-/_/g.
232 * (pathname and .ko.* are still stripped)
233 * Mimicking that... */
234 printf("alias %s %.*s\n",
235 (char*)llist_pop(&m->aliases),
240 #if ENABLE_FEATURE_MODUTILS_SYMBOLS
241 if (!(option_mask32 & OPT_n))
242 xfreopen_write("modules.symbols", stdout);
243 for (m = modules; m != NULL; m = m->next) {
244 const char *fname = bb_basename(m->name);
245 int fnlen = strchrnul(fname, '.') - fname;
247 printf("alias symbol:%s %.*s\n",
248 (char*)llist_pop(&m->symbols),
254 if (ENABLE_FEATURE_CLEAN_UP) {
256 module_info *old = modules;
257 modules = modules->next;