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depmod: prevent module dependency files missing during depmod invocation
[thirdparty/kmod.git] / libkmod / libkmod.h
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1/*
2 * libkmod - interface to kernel module operations
3 *
e6b0e49b 4 * Copyright (C) 2011-2013 ProFUSION embedded systems
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5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
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10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
dea2dfee 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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18 */
19
e8fd8fec 20#pragma once
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21#ifndef _LIBKMOD_H_
22#define _LIBKMOD_H_
586fc304 23
6806a043 24#include <fcntl.h>
586fc304 25#include <stdarg.h>
00178629 26#include <stdbool.h>
5369797d 27#include <inttypes.h>
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28
29#ifdef __cplusplus
30extern "C" {
31#endif
32
33/*
34 * kmod_ctx
35 *
36 * library user context - reads the config and system
37 * environment, user variables, allows custom logging
38 */
39struct kmod_ctx;
6a829211 40struct kmod_ctx *kmod_new(const char *dirname, const char * const *config_paths);
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41struct kmod_ctx *kmod_ref(struct kmod_ctx *ctx);
42struct kmod_ctx *kmod_unref(struct kmod_ctx *ctx);
586fc304 43void kmod_set_log_fn(struct kmod_ctx *ctx,
1bdd951e 44 void (*log_fn)(void *log_data,
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45 int priority, const char *file, int line,
46 const char *fn, const char *format,
47 va_list args),
1bdd951e 48 const void *data);
6d177553 49int kmod_get_log_priority(const struct kmod_ctx *ctx);
586fc304 50void kmod_set_log_priority(struct kmod_ctx *ctx, int priority);
6d177553 51void *kmod_get_userdata(const struct kmod_ctx *ctx);
1ce08a56 52void kmod_set_userdata(struct kmod_ctx *ctx, const void *userdata);
9226ddad 53
b87d01d6 54const char *kmod_get_dirname(const struct kmod_ctx *ctx);
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55
56/*
57 * Management of libkmod's resources
58 */
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59int kmod_load_resources(struct kmod_ctx *ctx);
60void kmod_unload_resources(struct kmod_ctx *ctx);
586fc304 61
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62enum kmod_resources {
63 KMOD_RESOURCES_OK = 0,
64 KMOD_RESOURCES_MUST_RELOAD = 1,
65 KMOD_RESOURCES_MUST_RECREATE = 2,
66};
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67int kmod_validate_resources(struct kmod_ctx *ctx);
68
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69enum kmod_index {
70 KMOD_INDEX_MODULES_DEP = 0,
71 KMOD_INDEX_MODULES_ALIAS,
72 KMOD_INDEX_MODULES_SYMBOL,
3805274b 73 KMOD_INDEX_MODULES_BUILTIN,
b08314f7 74 /* Padding to make sure enum is not mapped to char */
867da6fc 75 _KMOD_INDEX_PAD = 1U << 31,
b08314f7 76};
0224482e 77int kmod_dump_index(struct kmod_ctx *ctx, enum kmod_index type, int fd);
758428a7 78
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79/*
80 * kmod_list
81 *
82 * access to kmod generated lists
83 */
6924e47a 84struct kmod_list;
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85struct kmod_list *kmod_list_next(const struct kmod_list *list,
86 const struct kmod_list *curr);
87struct kmod_list *kmod_list_prev(const struct kmod_list *list,
88 const struct kmod_list *curr);
89struct kmod_list *kmod_list_last(const struct kmod_list *list);
d5ec60bc 90
6924e47a 91#define kmod_list_foreach(list_entry, first_entry) \
586fc304 92 for (list_entry = first_entry; \
e4351b05 93 list_entry != NULL; \
6924e47a 94 list_entry = kmod_list_next(first_entry, list_entry))
586fc304 95
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96#define kmod_list_foreach_reverse(list_entry, first_entry) \
97 for (list_entry = kmod_list_last(first_entry); \
98 list_entry != NULL; \
99 list_entry = kmod_list_prev(first_entry, list_entry))
100
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101/*
102 * kmod_config_iter
103 *
104 * access to configuration lists - it allows to get each configuration's
105 * key/value stored by kmod
106 */
107struct kmod_config_iter;
108struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx);
109struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx);
110struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx);
111struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx);
112struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx);
113struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx);
114const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter);
115const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter);
116bool kmod_config_iter_next(struct kmod_config_iter *iter);
117void kmod_config_iter_free_iter(struct kmod_config_iter *iter);
118
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119/*
120 * kmod_module
121 *
122 * Operate on kernel modules
123 */
124struct kmod_module;
125int kmod_module_new_from_name(struct kmod_ctx *ctx, const char *name,
126 struct kmod_module **mod);
127int kmod_module_new_from_path(struct kmod_ctx *ctx, const char *path,
128 struct kmod_module **mod);
129int kmod_module_new_from_lookup(struct kmod_ctx *ctx, const char *given_alias,
130 struct kmod_list **list);
131int kmod_module_new_from_loaded(struct kmod_ctx *ctx,
132 struct kmod_list **list);
133
134struct kmod_module *kmod_module_ref(struct kmod_module *mod);
135struct kmod_module *kmod_module_unref(struct kmod_module *mod);
136int kmod_module_unref_list(struct kmod_list *list);
137struct kmod_module *kmod_module_get_module(const struct kmod_list *entry);
138
139
f39dc70e 140/* Removal flags */
423f856a 141enum kmod_remove {
6806a043 142 KMOD_REMOVE_FORCE = O_TRUNC,
7ab88044 143 KMOD_REMOVE_NOWAIT = O_NONBLOCK, /* always set */
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144};
145
f39dc70e 146/* Insertion flags */
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147enum kmod_insert {
148 KMOD_INSERT_FORCE_VERMAGIC = 0x1,
149 KMOD_INSERT_FORCE_MODVERSION = 0x2,
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150};
151
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152/* Flags to kmod_module_probe_insert_module() */
153enum kmod_probe {
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154 KMOD_PROBE_FORCE_VERMAGIC = 0x00001,
155 KMOD_PROBE_FORCE_MODVERSION = 0x00002,
156 KMOD_PROBE_IGNORE_COMMAND = 0x00004,
7c10c69c 157 KMOD_PROBE_IGNORE_LOADED = 0x00008,
4c1ffb75 158 KMOD_PROBE_DRY_RUN = 0x00010,
814a57ba 159 KMOD_PROBE_FAIL_ON_LOADED = 0x00020,
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160
161 /* codes below can be used in return value, too */
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162 KMOD_PROBE_APPLY_BLACKLIST_ALL = 0x10000,
163 KMOD_PROBE_APPLY_BLACKLIST = 0x20000,
6882017f 164 KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY = 0x40000,
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165};
166
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167/* Flags to kmod_module_apply_filter() */
168enum kmod_filter {
169 KMOD_FILTER_BLACKLIST = 0x00001,
170 KMOD_FILTER_BUILTIN = 0x00002,
171};
172
8f788d58 173int kmod_module_remove_module(struct kmod_module *mod, unsigned int flags);
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174int kmod_module_insert_module(struct kmod_module *mod, unsigned int flags,
175 const char *options);
ddbda022 176int kmod_module_probe_insert_module(struct kmod_module *mod,
6a829211 177 unsigned int flags, const char *extra_options,
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178 int (*run_install)(struct kmod_module *m,
179 const char *cmdline, void *data),
6bd0713d 180 const void *data,
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181 void (*print_action)(struct kmod_module *m, bool install,
182 const char *options));
183
8f788d58 184
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185const char *kmod_module_get_name(const struct kmod_module *mod);
186const char *kmod_module_get_path(const struct kmod_module *mod);
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187const char *kmod_module_get_options(const struct kmod_module *mod);
188const char *kmod_module_get_install_commands(const struct kmod_module *mod);
189const char *kmod_module_get_remove_commands(const struct kmod_module *mod);
190struct kmod_list *kmod_module_get_dependencies(const struct kmod_module *mod);
191int kmod_module_get_softdeps(const struct kmod_module *mod,
192 struct kmod_list **pre, struct kmod_list **post);
193int kmod_module_get_filtered_blacklist(const struct kmod_ctx *ctx,
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194 const struct kmod_list *input,
195 struct kmod_list **output) __attribute__ ((deprecated));
196int kmod_module_apply_filter(const struct kmod_ctx *ctx,
197 enum kmod_filter filter_type,
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198 const struct kmod_list *input,
199 struct kmod_list **output);
200
201
202
203/*
204 * Information regarding "live information" from module's state, as returned
205 * by kernel
206 */
6e869df7 207
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208enum kmod_module_initstate {
209 KMOD_MODULE_BUILTIN = 0,
210 KMOD_MODULE_LIVE,
211 KMOD_MODULE_COMING,
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212 KMOD_MODULE_GOING,
213 /* Padding to make sure enum is not mapped to char */
867da6fc 214 _KMOD_MODULE_PAD = 1U << 31,
f12ae3c4 215};
6a829211 216const char *kmod_module_initstate_str(enum kmod_module_initstate state);
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217int kmod_module_get_initstate(const struct kmod_module *mod);
218int kmod_module_get_refcnt(const struct kmod_module *mod);
219struct kmod_list *kmod_module_get_holders(const struct kmod_module *mod);
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220struct kmod_list *kmod_module_get_sections(const struct kmod_module *mod);
221const char *kmod_module_section_get_name(const struct kmod_list *entry);
222unsigned long kmod_module_section_get_address(const struct kmod_list *entry);
223void kmod_module_section_free_list(struct kmod_list *list);
69f9dd43 224long kmod_module_get_size(const struct kmod_module *mod);
f12ae3c4 225
bd3f5535 226
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227
228/*
229 * Information retrieved from ELF headers and sections
230 */
1c522600 231
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232int kmod_module_get_info(const struct kmod_module *mod, struct kmod_list **list);
233const char *kmod_module_info_get_key(const struct kmod_list *entry);
234const char *kmod_module_info_get_value(const struct kmod_list *entry);
235void kmod_module_info_free_list(struct kmod_list *list);
236
237int kmod_module_get_versions(const struct kmod_module *mod, struct kmod_list **list);
238const char *kmod_module_version_get_symbol(const struct kmod_list *entry);
239uint64_t kmod_module_version_get_crc(const struct kmod_list *entry);
240void kmod_module_versions_free_list(struct kmod_list *list);
241
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242int kmod_module_get_symbols(const struct kmod_module *mod, struct kmod_list **list);
243const char *kmod_module_symbol_get_symbol(const struct kmod_list *entry);
244uint64_t kmod_module_symbol_get_crc(const struct kmod_list *entry);
245void kmod_module_symbols_free_list(struct kmod_list *list);
246
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247enum kmod_symbol_bind {
248 KMOD_SYMBOL_NONE = '\0',
249 KMOD_SYMBOL_LOCAL = 'L',
250 KMOD_SYMBOL_GLOBAL = 'G',
251 KMOD_SYMBOL_WEAK = 'W',
252 KMOD_SYMBOL_UNDEF = 'U'
253};
254
255int kmod_module_get_dependency_symbols(const struct kmod_module *mod, struct kmod_list **list);
256const char *kmod_module_dependency_symbol_get_symbol(const struct kmod_list *entry);
257int kmod_module_dependency_symbol_get_bind(const struct kmod_list *entry);
258uint64_t kmod_module_dependency_symbol_get_crc(const struct kmod_list *entry);
259void kmod_module_dependency_symbols_free_list(struct kmod_list *list);
260
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261#ifdef __cplusplus
262} /* extern "C" */
263#endif
586fc304 264#endif