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03761881 CMOF |
1 | /* |
2 | * kmod-remove - remove modules from the kernel. | |
3 | * | |
4 | * Copyright (C) 2015 Intel Corporation. All rights reserved. | |
5 | * Copyright (C) 2011-2013 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 <errno.h> | |
22 | #include <getopt.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | ||
26 | #include <libkmod/libkmod.h> | |
27 | ||
28 | #include "kmod.h" | |
29 | ||
30 | static const char cmdopts_s[] = "h"; | |
31 | static const struct option cmdopts[] = { | |
32 | {"help", no_argument, 0, 'h'}, | |
33 | { } | |
34 | }; | |
35 | ||
36 | static void help(void) | |
37 | { | |
38 | printf("Usage:\n" | |
39 | "\t%s remove [options] module\n" | |
40 | "Options:\n" | |
41 | "\t-h, --help show this help\n", | |
42 | program_invocation_short_name); | |
43 | } | |
44 | ||
45 | static int check_module_inuse(struct kmod_module *mod) { | |
46 | struct kmod_list *holders; | |
ea3e508f | 47 | int state, ret; |
03761881 CMOF |
48 | |
49 | state = kmod_module_get_initstate(mod); | |
50 | ||
51 | if (state == KMOD_MODULE_BUILTIN) { | |
52 | ERR("Module %s is builtin.\n", kmod_module_get_name(mod)); | |
53 | return -ENOENT; | |
54 | } else if (state < 0) { | |
55 | ERR("Module %s is not currently loaded\n", | |
56 | kmod_module_get_name(mod)); | |
57 | return -ENOENT; | |
58 | } | |
59 | ||
60 | holders = kmod_module_get_holders(mod); | |
61 | if (holders != NULL) { | |
62 | struct kmod_list *itr; | |
63 | ||
64 | ERR("Module %s is in use by:", kmod_module_get_name(mod)); | |
65 | ||
66 | kmod_list_foreach(itr, holders) { | |
67 | struct kmod_module *hm = kmod_module_get_module(itr); | |
68 | fprintf(stderr, " %s", kmod_module_get_name(hm)); | |
69 | kmod_module_unref(hm); | |
70 | } | |
71 | fputc('\n', stderr); | |
72 | ||
73 | kmod_module_unref_list(holders); | |
74 | return -EBUSY; | |
75 | } | |
76 | ||
ea3e508f EG |
77 | ret = kmod_module_get_refcnt(mod); |
78 | if (ret > 0) { | |
03761881 CMOF |
79 | ERR("Module %s is in use\n", kmod_module_get_name(mod)); |
80 | return -EBUSY; | |
ea3e508f EG |
81 | } else if (ret == -ENOENT) { |
82 | ERR("Module unloading is not supported\n"); | |
03761881 CMOF |
83 | } |
84 | ||
ea3e508f | 85 | return ret; |
03761881 CMOF |
86 | } |
87 | ||
88 | static int do_remove(int argc, char *argv[]) | |
89 | { | |
90 | struct kmod_ctx *ctx; | |
91 | struct kmod_module *mod; | |
92 | const char *name; | |
93 | int err, r = EXIT_SUCCESS; | |
94 | ||
95 | for (;;) { | |
96 | int c, idx =0; | |
97 | c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx); | |
98 | if (c == -1) | |
99 | break; | |
100 | switch (c) { | |
101 | case 'h': | |
102 | help(); | |
103 | return EXIT_SUCCESS; | |
104 | ||
105 | default: | |
106 | ERR("Unexpected getopt_long() value '%c'.\n", c); | |
107 | return EXIT_FAILURE; | |
108 | } | |
109 | } | |
110 | ||
111 | if (optind >= argc) { | |
112 | ERR("Missing module name\n"); | |
113 | return EXIT_FAILURE; | |
114 | } | |
115 | ||
116 | ctx = kmod_new(NULL, NULL); | |
117 | if (!ctx) { | |
118 | ERR("kmod_new() failed!\n"); | |
119 | return EXIT_FAILURE; | |
120 | } | |
121 | ||
122 | name = argv[optind]; | |
123 | err = kmod_module_new_from_name(ctx, name, &mod); | |
124 | if (err < 0) { | |
125 | ERR("Could not remove module %s: %s\n", name, strerror(-err)); | |
126 | goto end; | |
127 | } | |
128 | ||
129 | err = check_module_inuse(mod); | |
130 | if (err < 0) | |
131 | goto unref; | |
132 | ||
133 | err = kmod_module_remove_module(mod, 0); | |
134 | if (err < 0) | |
135 | goto unref; | |
136 | ||
137 | unref: | |
138 | kmod_module_unref(mod); | |
139 | ||
140 | end: | |
141 | kmod_unref(ctx); | |
142 | if (err < 0) { | |
143 | r = EXIT_FAILURE; | |
144 | ERR("Could not remove module %s: %s\n", name, strerror(-err)); | |
145 | } | |
146 | return r; | |
147 | } | |
148 | ||
149 | const struct kmod_cmd kmod_cmd_remove = { | |
150 | .name = "remove", | |
151 | .cmd = do_remove, | |
152 | .help = "remove module from kernel", | |
153 | }; |