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/*
* kmod-remove - remove modules from the kernel.
*
* Copyright (C) 2015 Intel Corporation. All rights reserved.
* 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 <stdlib.h>
#include <string.h>
#include <libkmod/libkmod.h>
#include "kmod.h"
static const char cmdopts_s[] = "h";
static const struct option cmdopts[] = {
{"help", no_argument, 0, 'h'},
{ }
};
static void help(void)
{
printf("Usage:\n"
"\t%s remove [options] module\n"
"Options:\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_remove(int argc, char *argv[])
{
struct kmod_ctx *ctx;
struct kmod_module *mod;
const char *name;
int err, r = EXIT_SUCCESS;
for (;;) {
int c, idx =0;
c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
if (c == -1)
break;
switch (c) {
case 'h':
help();
return EXIT_SUCCESS;
default:
ERR("Unexpected getopt_long() value '%c'.\n", c);
return EXIT_FAILURE;
}
}
if (optind >= argc) {
ERR("Missing module name\n");
return EXIT_FAILURE;
}
ctx = kmod_new(NULL, NULL);
if (!ctx) {
ERR("kmod_new() failed!\n");
return EXIT_FAILURE;
}
name = argv[optind];
err = kmod_module_new_from_name(ctx, name, &mod);
if (err < 0) {
ERR("Could not remove module %s: %s\n", name, strerror(-err));
goto end;
}
err = check_module_inuse(mod);
if (err < 0)
goto unref;
err = kmod_module_remove_module(mod, 0);
if (err < 0)
goto unref;
unref:
kmod_module_unref(mod);
end:
kmod_unref(ctx);
if (err < 0) {
r = EXIT_FAILURE;
ERR("Could not remove module %s: %s\n", name, strerror(-err));
}
return r;
}
const struct kmod_cmd kmod_cmd_remove = {
.name = "remove",
.cmd = do_remove,
.help = "remove module from kernel",
};
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