toys/other/rmmod.c

/* rmmod.c - Remove a module from the Linux kernel.
 *
 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>

USE_RMMOD(NEWTOY(rmmod, "<1wf", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))

config RMMOD
  bool "rmmod"
  default y
  help
    usage: rmmod [-wf] [MODULE]

    Unload the module named MODULE from the Linux kernel.
    -f	Force unload of a module
    -w	Wait until the module is no longer used.

*/

#define FOR_rmmod
#include "toys.h"

#include <sys/syscall.h>
#define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)

void rmmod_main(void)
{
  unsigned int flags = O_NONBLOCK|O_EXCL;
  char * mod_name;
  int len;

  // Basename
  mod_name = basename(*toys.optargs);

  // Remove .ko if present
  len = strlen(mod_name);
  if (len > 3 && !strcmp(&mod_name[len-3], ".ko" )) mod_name[len-3] = 0;

  if (toys.optflags & FLAG_f) flags |= O_TRUNC;
  if (toys.optflags & FLAG_w) flags &= ~O_NONBLOCK;

  if (delete_module(mod_name, flags))
    perror_exit("failed to unload %s", mod_name);
}