LXR toybox/toys/other/rmmod.c

   1/* rmmod.c - Remove a module from the Linux kernel.
   2 *
   3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
   4
   5USE_RMMOD(NEWTOY(rmmod, "<1wf", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
   6
   7config RMMOD
   8  bool "rmmod"
   9  default y
  10  help
  11    usage: rmmod [-wf] [MODULE]
  12
  13    Unload the module named MODULE from the Linux kernel.
  14    -f  Force unload of a module
  15    -w  Wait until the module is no longer used
  16
  17*/
  18
  19#define FOR_rmmod
  20#include "toys.h"
  21
  22#include <sys/syscall.h>
  23#define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
  24
  25void rmmod_main(void)
  26{
  27  unsigned int flags = O_NONBLOCK|O_EXCL;
  28  char * mod_name;
  29  int len;
  30
  31  // Basename
  32  mod_name = basename(*toys.optargs);
  33
  34  // Remove .ko if present
  35  len = strlen(mod_name);
  36  if (len > 3 && !strcmp(&mod_name[len-3], ".ko" )) mod_name[len-3] = 0;
  37
  38  if (toys.optflags & FLAG_f) flags |= O_TRUNC;
  39  if (toys.optflags & FLAG_w) flags &= ~O_NONBLOCK;
  40
  41  if (delete_module(mod_name, flags))
  42    perror_exit("failed to unload %s", mod_name);
  43}
  44