blob: 0aa6fb6f28b2ac9d3a2a3389c97e287a7c501054 [file] [log] [blame]
/*
* kmod-rmmod - remove modules from linux kernel using libkmod.
*
* Copyright (C) 2011-2012 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 <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <syslog.h>
#include "libkmod.h"
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'},
{"wait", no_argument, 0, 'w'},
{"help", no_argument, 0, 'h'},
{NULL, 0, 0, 0}
};
static void help(const char *progname)
{
fprintf(stderr,
"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-w, --wait begins module removal even if it is used and\n"
"\t will stop new users from accessing it.\n"
"\t-h, --help show this help\n",
progname);
}
static void log_syslog(void *data, int priority, const char *file, int line,
const char *fn, const char *format,
va_list args)
{
char *str, buf[32];
const char *prioname;
switch (priority) {
case LOG_CRIT:
prioname = "FATAL";
break;
case LOG_ERR:
prioname = "ERROR";
break;
case LOG_WARNING:
prioname = "WARNING";
break;
case LOG_NOTICE:
prioname = "NOTICE";
break;
case LOG_INFO:
prioname = "INFO";
break;
case LOG_DEBUG:
prioname = "DEBUG";
break;
default:
snprintf(buf, sizeof(buf), "LOG-%03d", priority);
prioname = buf;
}
if (vasprintf(&str, format, args) < 0)
return;
#ifdef ENABLE_DEBUG
syslog(LOG_NOTICE, "%s: %s:%d %s() %s", prioname, file, line, fn, str);
#else
syslog(LOG_NOTICE, "%s: %s", prioname, str);
#endif
free(str);
(void)data;
}
static int check_module_inuse(struct kmod_module *mod) {
struct kmod_list *holders;
if (kmod_module_get_initstate(mod) == -ENOENT) {
fprintf(stderr, "Error: 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;
fprintf(stderr, "Error: 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;
}
if (kmod_module_get_refcnt(mod) != 0) {
fprintf(stderr, "Error: Module %s is in use\n",
kmod_module_get_name(mod));
return -EBUSY;
}
return 0;
}
static int do_rmmod(int argc, char *argv[])
{
struct kmod_ctx *ctx;
const char *null_config = NULL;
int flags = KMOD_REMOVE_NOWAIT;
int use_syslog = 0;
int verbose = 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 'w':
flags &= ~KMOD_REMOVE_NOWAIT;
break;
case 'h':
help(basename(argv[0]));
return EXIT_SUCCESS;
case 'V':
puts(PACKAGE " version " VERSION);
return EXIT_SUCCESS;
case '?':
return EXIT_FAILURE;
default:
fprintf(stderr,
"Error: unexpected getopt_long() value '%c'.\n",
c);
return EXIT_FAILURE;
}
}
if (optind >= argc) {
fprintf(stderr, "Error: missing module name.\n");
return EXIT_FAILURE;
}
ctx = kmod_new(NULL, &null_config);
if (!ctx) {
fputs("Error: kmod_new() failed!\n", stderr);
return EXIT_FAILURE;
}
kmod_set_log_priority(ctx, kmod_get_log_priority(ctx) + verbose);
if (use_syslog) {
openlog("rmmod", LOG_CONS, LOG_DAEMON);
kmod_set_log_fn(ctx, log_syslog, NULL);
}
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) {
fprintf(stderr, "Error: could not use module %s: %s\n",
arg, strerror(-err));
break;
}
if (!(flags & KMOD_REMOVE_FORCE) && (flags & KMOD_REMOVE_NOWAIT))
if (check_module_inuse(mod) < 0) {
r++;
goto next;
}
err = kmod_module_remove_module(mod, flags);
if (err < 0) {
fprintf(stderr,
"Error: could not remove module %s: %s\n",
arg, strerror(-err));
r++;
}
next:
kmod_module_unref(mod);
}
kmod_unref(ctx);
if (use_syslog)
closelog();
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
#include "kmod.h"
const struct kmod_cmd kmod_cmd_compat_rmmod = {
.name = "rmmod",
.cmd = do_rmmod,
.help = "compat rmmod command",
};