* Mini rmmod implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2008 Timo Teras <timo.teras@iki.fi>
*
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config RMMOD
+//config: bool "rmmod (3.3 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: rmmod is used to unload specified modules from the kernel.
+
+//applet:IF_RMMOD(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(rmmod, rmmod, BB_DIR_SBIN, BB_SUID_DROP, rmmod)))
-#include <stdio.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <fcntl.h>
-#include <sys/syscall.h>
-#include "busybox.h"
+//kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
+//kbuild:lib-$(CONFIG_RMMOD) += rmmod.o modutils.o
+//kbuild:endif
-extern int rmmod_main(int argc, char **argv)
+//usage:#if !ENABLE_MODPROBE_SMALL
+//usage:#define rmmod_trivial_usage
+//usage: "[-wfa] [MODULE]..."
+//usage:#define rmmod_full_usage "\n\n"
+//usage: "Unload kernel modules\n"
+//usage: "\n -w Wait until the module is no longer used"
+//usage: "\n -f Force unload"
+//usage: "\n -a Remove all unused modules (recursively)"
+//usage:#define rmmod_example_usage
+//usage: "$ rmmod tulip\n"
+//usage:#endif
+
+#include "libbb.h"
+#include "modutils.h"
+
+int rmmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int rmmod_main(int argc UNUSED_PARAM, char **argv)
{
- int n, ret = EXIT_SUCCESS;
- size_t nmod = 0; /* number of modules */
- size_t pnmod = -1; /* previous number of modules */
- unsigned int flags = O_NONBLOCK|O_EXCL;
-#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
- void *buf; /* hold the module names which we ignore but must get */
- size_t bufsize = 0;
-#endif
+ int n, err;
+ unsigned flags = O_NONBLOCK | O_EXCL;
/* Parse command line. */
- while ((n = getopt(argc, argv, "a")) != EOF) {
- switch (n) {
- case 'w': // --wait
- flags &= ~O_NONBLOCK;
- break;
- case 'f': // --force
- flags |= O_TRUNC;
- break;
- case 'a':
- /* Unload _all_ unused modules via NULL delete_module() call */
- /* until the number of modules does not change */
-#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
- buf = xmalloc(bufsize = 256);
-#endif
- while (nmod != pnmod) {
- if (syscall(__NR_delete_module, NULL, flags) < 0) {
- if (errno==EFAULT)
- return(ret);
- bb_perror_msg_and_die("rmmod");
- }
- pnmod = nmod;
-#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
- /* 1 == QM_MODULES */
- if (my_query_module(NULL, 1, &buf, &bufsize, &nmod)) {
- bb_perror_msg_and_die("QM_MODULES");
- }
-#endif
- }
-#if defined CONFIG_FEATURE_CLEAN_UP && CONFIG_FEATURE_QUERY_MODULE_INTERFACE
- free(buf);
-#endif
- return EXIT_SUCCESS;
- default:
- bb_show_usage();
- }
+ n = getopt32(argv, "wfas"); // -s ignored
+ argv += optind;
+ if (n & 1) // --wait
+ flags &= ~O_NONBLOCK;
+ if (n & 2) // --force
+ flags |= O_TRUNC;
+ if (n & 4) {
+ /* Unload _all_ unused modules via NULL delete_module() call */
+ err = bb_delete_module(NULL, flags);
+ if (err && err != EFAULT)
+ bb_perror_msg_and_die("rmmod");
+ return EXIT_SUCCESS;
}
- if (optind == argc)
+ if (!*argv)
bb_show_usage();
- for (n = optind; n < argc; n++) {
- if (syscall(__NR_delete_module, argv[n], flags) < 0) {
- bb_perror_msg("%s", argv[n]);
- ret = EXIT_FAILURE;
- }
+ n = ENABLE_FEATURE_2_4_MODULES && get_linux_version_code() < KERNEL_VERSION(2,6,0);
+ while (*argv) {
+ char modname[MODULE_NAME_LEN];
+ const char *bname;
+
+ bname = bb_basename(*argv++);
+ if (n)
+ safe_strncpy(modname, bname, MODULE_NAME_LEN);
+ else
+ filename2modname(bname, modname);
+ err = bb_delete_module(modname, flags);
+ if (err)
+ bb_perror_msg_and_die("can't unload module '%s'",
+ modname);
}
- return(ret);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff