LXR busybox/modutils/rmmod.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini rmmod implementation for busybox
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 * Copyright (C) 2008 Timo Teras <timo.teras@iki.fi>
   7 *
   8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9 */
  10//config:config RMMOD
  11//config:       bool "rmmod (3.6 kb)"
  12//config:       default y
  13//config:       select PLATFORM_LINUX
  14//config:       help
  15//config:       rmmod is used to unload specified modules from the kernel.
  16
  17//applet:IF_RMMOD(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(rmmod, rmmod, BB_DIR_SBIN, BB_SUID_DROP, rmmod)))
  18
  19//kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
  20//kbuild:lib-$(CONFIG_RMMOD) += rmmod.o modutils.o
  21//kbuild:endif
  22
  23//usage:#if !ENABLE_MODPROBE_SMALL
  24//usage:#define rmmod_trivial_usage
  25//usage:       "[-wfa] [MODULE]..."
  26//usage:#define rmmod_full_usage "\n\n"
  27//usage:       "Unload kernel modules\n"
  28//usage:     "\n        -w      Wait until the module is no longer used"
  29//usage:     "\n        -f      Force unload"
  30//usage:     "\n        -a      Remove all unused modules (recursively)"
  31//usage:#define rmmod_example_usage
  32//usage:       "$ rmmod tulip\n"
  33//usage:#endif
  34
  35#include "libbb.h"
  36#include "modutils.h"
  37
  38int rmmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  39int rmmod_main(int argc UNUSED_PARAM, char **argv)
  40{
  41        int n, err;
  42        unsigned flags = O_NONBLOCK | O_EXCL;
  43
  44        /* Parse command line. */
  45        n = getopt32(argv, "wfas"); // -s ignored
  46        argv += optind;
  47        if (n & 1)  // --wait
  48                flags &= ~O_NONBLOCK;
  49        if (n & 2)  // --force
  50                flags |= O_TRUNC;
  51        if (n & 4) {
  52                /* Unload _all_ unused modules via NULL delete_module() call */
  53                err = bb_delete_module(NULL, flags);
  54                if (err && err != EFAULT)
  55                        bb_perror_msg_and_die("rmmod");
  56                return EXIT_SUCCESS;
  57        }
  58
  59        if (!*argv)
  60                bb_show_usage();
  61
  62        n = ENABLE_FEATURE_2_4_MODULES && get_linux_version_code() < KERNEL_VERSION(2,6,0);
  63        while (*argv) {
  64                char modname[MODULE_NAME_LEN];
  65                const char *bname;
  66
  67                bname = bb_basename(*argv++);
  68                if (n)
  69                        safe_strncpy(modname, bname, MODULE_NAME_LEN);
  70                else
  71                        filename2modname(bname, modname);
  72                err = bb_delete_module(modname, flags);
  73                if (err)
  74                        bb_perror_msg_and_die("can't unload module '%s'",
  75                                        modname);
  76        }
  77
  78        return EXIT_SUCCESS;
  79}
  80