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
help(void)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
check_module_inuse(struct kmod_module * mod)45 static int check_module_inuse(struct kmod_module *mod) {
46 struct kmod_list *holders;
47 int state, ret;
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
77 ret = kmod_module_get_refcnt(mod);
78 if (ret > 0) {
79 ERR("Module %s is in use\n", kmod_module_get_name(mod));
80 return -EBUSY;
81 } else if (ret == -ENOENT) {
82 ERR("Module unloading is not supported\n");
83 }
84
85 return ret;
86 }
87
do_remove(int argc,char * argv[])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 };
154