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/*
* Remove a module from a running kernel.
*
* Original author: Jon Tombs <jon@gtex02.us.es>,
* extended by Bjrn Ekwall <bj0rn@blox.se> in 1994 (C).
* New re-implementation by Bjrn Ekwall <bj0rn@blox.se> February 1999,
* Generic kernel module info based on work by Richard Henderson <rth@tamu.edu>
* Add ksymoops support by Keith Owens <kaos@ocs.com.au> August 1999,
*
* This file is part of the Linux modutils.
*
* 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, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ident "$Id: rmmod.c 1.7 Thu, 13 Apr 2000 18:17:59 +1000 kaos $"
#include <errno.h>
#include <malloc.h>
#include <unistd.h>
#include <getopt.h>
#include "module.h"
#include "version.h"
#include "util.h"
#include "obj.h"
#include "modstat.h"
#define WANT_TO_REMOVE 1
#define CAN_REMOVE 2
#ifdef COMBINE_rmmod
#define main rmmod_main
#endif
void rmmod_usage(void)
{
fputs("Usage:\n"
"rmmod [-arshV] module ...\n"
"\n"
" -a, --all Remove all unused modules\n"
" -r, --stacks Remove stacks, starting at the named module\n"
" -s, --syslog Use syslog for error messages\n"
" -h, --help Print this message\n"
" -V, --version Print the release version number\n"
,stderr);
}
int main(int argc, char **argv)
{
struct module_stat *m;
int i;
int j;
int ret = 0;
int recursive = 0;
size_t n_module_names;
char *module_names = NULL;
struct option long_opts[] = {
{"all", 0, 0, 'a'},
{"stacks", 0, 0, 'r'},
{"syslog", 0, 0, 's'},
{"version", 0, 0, 'V'},
{"help", 0, 0, 'h'},
{0, 0, 0, 0}
};
error_file = "rmmod";
/*
* Collect the loaded modules before deletion. delete_module()
* gives no indication that any modules were deleted so we have to
* do it the hard way.
*/
get_kernel_info(0);
module_names = xmalloc(l_module_name_list);
memcpy(module_names, module_name_list, l_module_name_list);
n_module_names = n_module_stat;
while ((i = getopt_long(argc, argv, "arsVh",
&long_opts[0], NULL)) != EOF)
switch (i) {
case 'a':
/* Remove all unused modules and stacks. */
if (delete_module(NULL)) {
perror("rmmod");
snap_shot(module_names, n_module_names);
free(module_names);
return 1;
}
snap_shot(module_names, n_module_names);
free(module_names);
return 0;
case 'r':
/* Remove stacks, starting at named top module */
recursive = 1;
break;
case 's':
/* Start syslogging. */
setsyslog("rmmod");
break;
case 'V':
fputs("rmmod version " MODUTILS_VERSION "\n", stderr);
break;
case 'h':
rmmod_usage();
return 0;
default:
usage:
rmmod_usage();
return 1;
}
if (optind >= argc)
goto usage;
if (!recursive) {
for (i = optind; i < argc; ++i) {
if (delete_module(argv[i]) < 0) {
++ret;
if (errno == ENOENT)
error("module %s is not loaded", argv[i]);
else
perror(argv[i]);
}
}
snap_shot(module_names, n_module_names);
free(module_names);
return ret ? 1 : 0;
}
/*
* Recursive removal
* Fetch all of the currently loaded modules and their dependencies.
*/
if (!get_kernel_info(K_INFO | K_REFS))
return 1;
/* Find out which ones we want to remove. */
for (i = optind; i < argc; ++i) {
for (m = module_stat, j = 0; j < n_module_stat; ++j, ++m) {
if (strcmp(m->name, argv[i]) == 0) {
m->status = WANT_TO_REMOVE;
break;
}
}
if (j == n_module_stat) {
error("module %s not loaded", argv[i]);
ret = 1;
}
}
/* Remove them if we can. */
for (m = module_stat, i = 0; i < n_module_stat; ++i, ++m) {
struct module_stat **r;
if (m->nrefs || (m->status & WANT_TO_REMOVE))
m->status |= CAN_REMOVE;
for (j = 0, r = m->refs;j < m->nrefs; ++j) {
switch (r[j]->status) {
case CAN_REMOVE:
case WANT_TO_REMOVE | CAN_REMOVE:
break;
case WANT_TO_REMOVE:
if (r[j]->nrefs == 0)
break;
/* else FALLTHRU */
default:
m->status &= ~CAN_REMOVE;
break;
}
}
switch (m->status) {
case CAN_REMOVE:
case WANT_TO_REMOVE | CAN_REMOVE:
if (delete_module(m->name) < 0) {
error("%s: %m", m->name);
ret = 1;
}
break;
case WANT_TO_REMOVE:
error("%s is in use", m->name);
ret = 1;
break;
}
}
snap_shot(module_names, n_module_names);
free(module_names);
return ret;
}
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