1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* kmod-rmmod - remove modules from linux kernel using libkmod.
*
* Copyright (C) 2011-2013 ProFUSION embedded systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <shared/macro.h>
#include <libkmod/libkmod.h>
#include "kmod.h"
#define DEFAULT_VERBOSE LOG_ERR
static int verbose = DEFAULT_VERBOSE;
static int use_syslog;
static const char cmdopts_s[] = "fsvVwh";
static const struct option cmdopts[] = {
{"force", no_argument, 0, 'f'},
{"syslog", no_argument, 0, 's'},
{"verbose", no_argument, 0, 'v'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{NULL, 0, 0, 0}
};
static void help(void)
{
printf("Usage:\n"
"\t%s [options] modulename ...\n"
"Options:\n"
"\t-f, --force forces a module unload and may crash your\n"
"\t machine. This requires Forced Module Removal\n"
"\t option in your kernel. DANGEROUS\n"
"\t-s, --syslog print to syslog, not stderr\n"
"\t-v, --verbose enables more messages\n"
"\t-V, --version show version\n"
"\t-h, --help show this help\n",
program_invocation_short_name);
}
static int check_module_inuse(struct kmod_module *mod) {
struct kmod_list *holders;
int state, ret;
state = kmod_module_get_initstate(mod);
if (state == KMOD_MODULE_BUILTIN) {
ERR("Module %s is builtin.\n", kmod_module_get_name(mod));
return -ENOENT;
} else if (state < 0) {
ERR("Module %s is not currently loaded\n",
kmod_module_get_name(mod));
return -ENOENT;
}
holders = kmod_module_get_holders(mod);
if (holders != NULL) {
struct kmod_list *itr;
ERR("Module %s is in use by:", kmod_module_get_name(mod));
kmod_list_foreach(itr, holders) {
struct kmod_module *hm = kmod_module_get_module(itr);
fprintf(stderr, " %s", kmod_module_get_name(hm));
kmod_module_unref(hm);
}
fputc('\n', stderr);
kmod_module_unref_list(holders);
return -EBUSY;
}
ret = kmod_module_get_refcnt(mod);
if (ret > 0) {
ERR("Module %s is in use\n", kmod_module_get_name(mod));
return -EBUSY;
} else if (ret == -ENOENT) {
ERR("Module unloading is not supported\n");
}
return ret;
}
static int do_rmmod(int argc, char *argv[])
{
struct kmod_ctx *ctx;
const char *null_config = NULL;
int flags = 0;
int i, err, r = 0;
for (;;) {
int c, idx = 0;
c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
if (c == -1)
break;
switch (c) {
case 'f':
flags |= KMOD_REMOVE_FORCE;
break;
case 's':
use_syslog = 1;
break;
case 'v':
verbose++;
break;
case 'h':
help();
return EXIT_SUCCESS;
case 'V':
puts(PACKAGE " version " VERSION);
puts(KMOD_FEATURES);
return EXIT_SUCCESS;
case '?':
return EXIT_FAILURE;
default:
ERR("unexpected getopt_long() value '%c'.\n", c);
return EXIT_FAILURE;
}
}
log_open(use_syslog);
if (optind >= argc) {
ERR("missing module name.\n");
r = EXIT_FAILURE;
goto done;
}
ctx = kmod_new(NULL, &null_config);
if (!ctx) {
ERR("kmod_new() failed!\n");
r = EXIT_FAILURE;
goto done;
}
log_setup_kmod_log(ctx, verbose);
for (i = optind; i < argc; i++) {
struct kmod_module *mod;
const char *arg = argv[i];
struct stat st;
if (stat(arg, &st) == 0)
err = kmod_module_new_from_path(ctx, arg, &mod);
else
err = kmod_module_new_from_name(ctx, arg, &mod);
if (err < 0) {
ERR("could not use module %s: %s\n", arg,
strerror(-err));
break;
}
if (!(flags & KMOD_REMOVE_FORCE) && check_module_inuse(mod) < 0) {
r++;
goto next;
}
err = kmod_module_remove_module(mod, flags);
if (err < 0) {
ERR("could not remove module %s: %s\n", arg,
strerror(-err));
r++;
}
next:
kmod_module_unref(mod);
}
kmod_unref(ctx);
done:
log_close();
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
const struct kmod_cmd kmod_cmd_compat_rmmod = {
.name = "rmmod",
.cmd = do_rmmod,
.help = "compat rmmod command",
};
|
