Contents of /tags/mkinitrd-6_1_1/busybox/modutils/depmod.c
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 5726 byte(s)
tagged 'mkinitrd-6_1_1'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
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 |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
9 | */ |
10 | |
11 | #undef _GNU_SOURCE |
12 | #define _GNU_SOURCE |
13 | #include <libbb.h> |
14 | #include <sys/utsname.h> /* uname() */ |
15 | #include "modutils.h" |
16 | |
17 | /* |
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 |
22 | */ |
23 | |
24 | typedef struct module_info { |
25 | struct module_info *next; |
26 | char *name, *modname; |
27 | llist_t *dependencies; |
28 | llist_t *aliases; |
29 | llist_t *symbols; |
30 | struct module_info *dnext, *dprev; |
31 | } module_info; |
32 | |
33 | enum { |
34 | ARG_a = (1<<0), /* All modules, ignore mods in argv */ |
35 | ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */ |
36 | ARG_b = (1<<2), /* base directory when modules are in staging area */ |
37 | ARG_e = (1<<3), /* with -F, print unresolved symbols */ |
38 | ARG_F = (1<<4), /* System.map that contains the symbols */ |
39 | ARG_n = (1<<5) /* dry-run, print to stdout only */ |
40 | }; |
41 | |
42 | static int FAST_FUNC parse_module(const char *fname, struct stat *sb, |
43 | void *data, int UNUSED_PARAM depth) |
44 | { |
45 | module_info **first = (module_info **) data; |
46 | char *image, *ptr; |
47 | module_info *info; |
48 | size_t len = sb->st_size; |
49 | |
50 | if (strrstr(fname, ".ko") == NULL) |
51 | return TRUE; |
52 | |
53 | image = xmalloc_open_zipped_read_close(fname, &len); |
54 | info = xzalloc(sizeof(module_info)); |
55 | |
56 | info->next = *first; |
57 | *first = info; |
58 | |
59 | info->dnext = info->dprev = info; |
60 | info->name = xasprintf("/%s", fname); |
61 | info->modname = filename2modname(fname, NULL); |
62 | for (ptr = image; ptr < image + len - 10; ptr++) { |
63 | if (strncmp(ptr, "depends=", 8) == 0) { |
64 | char *u; |
65 | |
66 | ptr += 8; |
67 | for (u = ptr; *u; u++) |
68 | if (*u == '-') |
69 | *u = '_'; |
70 | ptr += string_to_llist(ptr, &info->dependencies, ","); |
71 | } else if (ENABLE_FEATURE_MODUTILS_ALIAS && |
72 | strncmp(ptr, "alias=", 6) == 0) { |
73 | llist_add_to(&info->aliases, xstrdup(ptr + 6)); |
74 | ptr += strlen(ptr); |
75 | } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS && |
76 | strncmp(ptr, "__ksymtab_", 10) == 0) { |
77 | ptr += 10; |
78 | if (strncmp(ptr, "gpl", 3) == 0 || |
79 | strcmp(ptr, "strings") == 0) |
80 | continue; |
81 | llist_add_to(&info->symbols, xstrdup(ptr)); |
82 | ptr += strlen(ptr); |
83 | } |
84 | } |
85 | free(image); |
86 | |
87 | return TRUE; |
88 | } |
89 | |
90 | static module_info *find_module(module_info *modules, const char *modname) |
91 | { |
92 | module_info *m; |
93 | |
94 | for (m = modules; m != NULL; m = m->next) |
95 | if (strcmp(m->modname, modname) == 0) |
96 | return m; |
97 | return NULL; |
98 | } |
99 | |
100 | static void order_dep_list(module_info *modules, module_info *start, |
101 | llist_t *add) |
102 | { |
103 | module_info *m; |
104 | llist_t *n; |
105 | |
106 | for (n = add; n != NULL; n = n->link) { |
107 | m = find_module(modules, n->data); |
108 | if (m == NULL) |
109 | continue; |
110 | |
111 | /* unlink current entry */ |
112 | m->dnext->dprev = m->dprev; |
113 | m->dprev->dnext = m->dnext; |
114 | |
115 | /* and add it to tail */ |
116 | m->dnext = start; |
117 | m->dprev = start->dprev; |
118 | start->dprev->dnext = m; |
119 | start->dprev = m; |
120 | |
121 | /* recurse */ |
122 | order_dep_list(modules, start, m->dependencies); |
123 | } |
124 | } |
125 | |
126 | static void xfreopen_write(const char *file, FILE *f) |
127 | { |
128 | if (freopen(file, "w", f) == NULL) |
129 | bb_perror_msg_and_die("can't open '%s'", file); |
130 | } |
131 | |
132 | int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
133 | int depmod_main(int argc UNUSED_PARAM, char **argv) |
134 | { |
135 | module_info *modules = NULL, *m, *dep; |
136 | const char *moddir_base = "/"; |
137 | char *moddir, *version; |
138 | struct utsname uts; |
139 | int tmp; |
140 | |
141 | getopt32(argv, "aAb:eF:n", &moddir_base, NULL); |
142 | argv += optind; |
143 | |
144 | /* goto modules location */ |
145 | xchdir(moddir_base); |
146 | |
147 | /* If a version is provided, then that kernel version's module directory |
148 | * is used, rather than the current kernel version (as returned by |
149 | * "uname -r"). */ |
150 | if (*argv && sscanf(*argv, "%d.%d.%d", &tmp, &tmp, &tmp) == 3) { |
151 | version = *argv++; |
152 | } else { |
153 | uname(&uts); |
154 | version = uts.release; |
155 | } |
156 | moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version); |
157 | |
158 | /* Scan modules */ |
159 | if (*argv) { |
160 | char *modfile; |
161 | struct stat sb; |
162 | do { |
163 | modfile = concat_path_file(moddir, *argv); |
164 | xstat(modfile, &sb); |
165 | parse_module(modfile, &sb, &modules, 0); |
166 | free(modfile); |
167 | } while (*(++argv)); |
168 | } else { |
169 | recursive_action(moddir, ACTION_RECURSE, |
170 | parse_module, NULL, &modules, 0); |
171 | } |
172 | |
173 | /* Prepare for writing out the dep files */ |
174 | xchdir(moddir); |
175 | if (ENABLE_FEATURE_CLEAN_UP) |
176 | free(moddir); |
177 | |
178 | /* Generate dependency and alias files */ |
179 | if (!(option_mask32 & ARG_n)) |
180 | xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout); |
181 | for (m = modules; m != NULL; m = m->next) { |
182 | printf("%s:", m->name); |
183 | |
184 | order_dep_list(modules, m, m->dependencies); |
185 | while (m->dnext != m) { |
186 | dep = m->dnext; |
187 | printf(" %s", dep->name); |
188 | |
189 | /* unlink current entry */ |
190 | dep->dnext->dprev = dep->dprev; |
191 | dep->dprev->dnext = dep->dnext; |
192 | dep->dnext = dep->dprev = dep; |
193 | } |
194 | bb_putchar('\n'); |
195 | } |
196 | |
197 | #if ENABLE_FEATURE_MODUTILS_ALIAS |
198 | if (!(option_mask32 & ARG_n)) |
199 | xfreopen_write("modules.alias", stdout); |
200 | for (m = modules; m != NULL; m = m->next) { |
201 | while (m->aliases) { |
202 | printf("alias %s %s\n", |
203 | (char*)llist_pop(&m->aliases), |
204 | m->modname); |
205 | } |
206 | } |
207 | #endif |
208 | #if ENABLE_FEATURE_MODUTILS_SYMBOLS |
209 | if (!(option_mask32 & ARG_n)) |
210 | xfreopen_write("modules.symbols", stdout); |
211 | for (m = modules; m != NULL; m = m->next) { |
212 | while (m->symbols) { |
213 | printf("alias symbol:%s %s\n", |
214 | (char*)llist_pop(&m->symbols), |
215 | m->modname); |
216 | } |
217 | } |
218 | #endif |
219 | |
220 | if (ENABLE_FEATURE_CLEAN_UP) { |
221 | while (modules) { |
222 | module_info *old = modules; |
223 | modules = modules->next; |
224 | free(old->name); |
225 | free(old->modname); |
226 | free(old); |
227 | } |
228 | } |
229 | |
230 | return EXIT_SUCCESS; |
231 | } |