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[thirdparty/systemd.git] / src / udev / udev-builtin-kmod.c
1 /*
2 * load kernel modules
3 *
4 * Copyright (C) 2011-2012 Kay Sievers <kay.sievers@vrfy.org>
5 * Copyright (C) 2011 ProFUSION embedded systems
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stdarg.h>
24 #include <unistd.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <sys/stat.h>
29 #include <sys/wait.h>
30 #include <libkmod.h>
31
32 #include "udev.h"
33
34 static struct kmod_ctx *ctx;
35
36 static int load_module(struct udev *udev, const char *alias)
37 {
38 struct kmod_list *list = NULL;
39 struct kmod_list *l;
40 int err;
41
42 err = kmod_module_new_from_lookup(ctx, alias, &list);
43 if (err < 0)
44 return err;
45
46 if (list == NULL)
47 log_debug("no module matches '%s'\n", alias);
48
49 kmod_list_foreach(l, list) {
50 struct kmod_module *mod = kmod_module_get_module(l);
51
52 err = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
53 if (err == KMOD_PROBE_APPLY_BLACKLIST)
54 log_debug("module '%s' is blacklisted\n", kmod_module_get_name(mod));
55 else if (err == 0)
56 log_debug("inserted '%s'\n", kmod_module_get_name(mod));
57 else
58 log_debug("failed to insert '%s'\n", kmod_module_get_name(mod));
59
60 kmod_module_unref(mod);
61 }
62
63 kmod_module_unref_list(list);
64 return err;
65 }
66
67 static void udev_kmod_log(void *data, int priority, const char *file, int line,
68 const char *fn, const char *format, va_list args)
69 {
70 udev_main_log(data, priority, file, line, fn, format, args);
71 }
72
73 static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool test)
74 {
75 struct udev *udev = udev_device_get_udev(dev);
76 int i;
77
78 if (ctx)
79 return 0;
80
81 if (argc < 3 || strcmp(argv[1], "load")) {
82 log_error("expect: %s load <module>\n", argv[0]);
83 return EXIT_FAILURE;
84 }
85
86 for (i = 2; argv[i]; i++) {
87 log_debug("execute '%s' '%s'\n", argv[1], argv[i]);
88 load_module(udev, argv[i]);
89 }
90
91 return EXIT_SUCCESS;
92 }
93
94 /* called at udev startup and reload */
95 static int builtin_kmod_init(struct udev *udev)
96 {
97 if (ctx)
98 return 0;
99
100 ctx = kmod_new(NULL, NULL);
101 if (!ctx)
102 return -ENOMEM;
103
104 log_debug("load module index\n");
105 kmod_set_log_fn(ctx, udev_kmod_log, udev);
106 kmod_load_resources(ctx);
107 return 0;
108 }
109
110 /* called on udev shutdown and reload request */
111 static void builtin_kmod_exit(struct udev *udev)
112 {
113 log_debug("unload module index\n");
114 ctx = kmod_unref(ctx);
115 }
116
117 /* called every couple of seconds during event activity; 'true' if config has changed */
118 static bool builtin_kmod_validate(struct udev *udev)
119 {
120 log_debug("validate module index\n");
121 if (!ctx)
122 return false;
123 return (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK);
124 }
125
126 const struct udev_builtin udev_builtin_kmod = {
127 .name = "kmod",
128 .cmd = builtin_kmod,
129 .init = builtin_kmod_init,
130 .exit = builtin_kmod_exit,
131 .validate = builtin_kmod_validate,
132 .help = "kernel module loader",
133 .run_once = false,
134 };