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