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;
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 if (kmod_module_get_refcnt(mod) != 0) {
78 ERR("Module %s is in use\n", kmod_module_get_name(mod));
79 return -EBUSY;
80 }
81
82 return 0;
83 }
84
do_remove(int argc,char * argv[])85 static int do_remove(int argc, char *argv[])
86 {
87 struct kmod_ctx *ctx;
88 struct kmod_module *mod;
89 const char *name;
90 int err, r = EXIT_SUCCESS;
91
92 for (;;) {
93 int c, idx =0;
94 c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
95 if (c == -1)
96 break;
97 switch (c) {
98 case 'h':
99 help();
100 return EXIT_SUCCESS;
101
102 default:
103 ERR("Unexpected getopt_long() value '%c'.\n", c);
104 return EXIT_FAILURE;
105 }
106 }
107
108 if (optind >= argc) {
109 ERR("Missing module name\n");
110 return EXIT_FAILURE;
111 }
112
113 ctx = kmod_new(NULL, NULL);
114 if (!ctx) {
115 ERR("kmod_new() failed!\n");
116 return EXIT_FAILURE;
117 }
118
119 name = argv[optind];
120 err = kmod_module_new_from_name(ctx, name, &mod);
121 if (err < 0) {
122 ERR("Could not remove module %s: %s\n", name, strerror(-err));
123 goto end;
124 }
125
126 err = check_module_inuse(mod);
127 if (err < 0)
128 goto unref;
129
130 err = kmod_module_remove_module(mod, 0);
131 if (err < 0)
132 goto unref;
133
134 unref:
135 kmod_module_unref(mod);
136
137 end:
138 kmod_unref(ctx);
139 if (err < 0) {
140 r = EXIT_FAILURE;
141 ERR("Could not remove module %s: %s\n", name, strerror(-err));
142 }
143 return r;
144 }
145
146 const struct kmod_cmd kmod_cmd_remove = {
147 .name = "remove",
148 .cmd = do_remove,
149 .help = "remove module from kernel",
150 };
151