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 (3.3 kb)"
  12//config:       default y
  13//config:       help
  14//config:       rmmod is used to unload specified modules from the kernel.
  15
  16//applet:IF_RMMOD(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(rmmod, rmmod, BB_DIR_SBIN, BB_SUID_DROP, rmmod)))
  17
  18//kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
  19//kbuild:lib-$(CONFIG_RMMOD) += rmmod.o modutils.o
  20//kbuild:endif
  21
  22//usage:#if !ENABLE_MODPROBE_SMALL
  23//usage:#define rmmod_trivial_usage
  24//usage:       "[-wfa] [MODULE]..."
  25//usage:#define rmmod_full_usage "\n\n"
  26//usage:       "Unload kernel modules\n"
  27//usage:     "\n        -w      Wait until the module is no longer used"
  28//usage:     "\n        -f      Force unload"
  29//usage:     "\n        -a      Remove all unused modules (recursively)"
  30//usage:#define rmmod_example_usage
  31//usage:       "$ rmmod tulip\n"
  32//usage:#endif
  33
  34#include "libbb.h"
  35#include "modutils.h"
  36
  37int rmmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  38int rmmod_main(int argc UNUSED_PARAM, char **argv)
  39{
  40        int n, err;
  41        unsigned flags = O_NONBLOCK | O_EXCL;
  42
  43        /* Parse command line. */
  44        n = getopt32(argv, "wfas"); // -s ignored
  45        argv += optind;
  46        if (n & 1)  // --wait
  47                flags &= ~O_NONBLOCK;
  48        if (n & 2)  // --force
  49                flags |= O_TRUNC;
  50        if (n & 4) {
  51                /* Unload _all_ unused modules via NULL delete_module() call */
  52                err = bb_delete_module(NULL, flags);
  53                if (err && err != EFAULT)
  54                        bb_simple_perror_msg_and_die("rmmod");
  55                return EXIT_SUCCESS;
  56        }
  57
  58        if (!*argv)
  59                bb_show_usage();
  60
  61        n = ENABLE_FEATURE_2_4_MODULES && get_linux_version_code() < KERNEL_VERSION(2,6,0);
  62        while (*argv) {
  63                char modname[MODULE_NAME_LEN];
  64                const char *bname;
  65
  66                bname = bb_basename(*argv++);
  67                if (n)
  68                        safe_strncpy(modname, bname, MODULE_NAME_LEN);
  69                else
  70                        filename2modname(bname, modname);
  71                err = bb_delete_module(modname, flags);
  72                if (err)
  73                        bb_perror_msg_and_die("can't unload module '%s'",
  74                                        modname);
  75        }
  76
  77        return EXIT_SUCCESS;
  78}
  79