#ifndef __LINUX_KMOD_H__
  #define __LINUX_KMOD_H__
  
  /*
   *	include/linux/kmod.h
   *
   *      This program is free software; you can redistribute it and/or modify
   *      it under the terms of the GNU General Public License as published by
   *      the Free Software Foundation; either version 2 of the License, or
   *      (at your option) any later version.
   *
   *      This program is distributed in the hope that it will be useful,
   *      but WITHOUT ANY WARRANTY; without even the implied warranty of
   *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *      GNU General Public License for more details.
   *
   *      You should have received a copy of the GNU General Public License
   *      along with this program; if not, write to the Free Software
   *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */

  #include <linux/gfp.h>

  #include <linux/stddef.h>

  #include <linux/errno.h>
  #include <linux/compiler.h>

  #include <linux/workqueue.h>

  #include <linux/sysctl.h>

  
  #define KMOD_PATH_LEN 256

  #ifdef CONFIG_MODULES

  extern char modprobe_path[]; /* for sysctl */

  /* modprobe exit status on success, -ve on error.  Return value
   * usually useless though. */

  extern __printf(2, 3)
  int __request_module(bool wait, const char *name, ...);

  #define request_module(mod...) __request_module(true, mod)
  #define request_module_nowait(mod...) __request_module(false, mod)
  #define try_then_request_module(x, mod...) \

  	((x) ?: (__request_module(true, mod), (x)))

  #else

  static inline int request_module(const char *name, ...) { return -ENOSYS; }
  static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }

  #define try_then_request_module(x, mod...) (x)

  #endif

  struct cred;

  struct file;

  
  enum umh_wait {
  	UMH_NO_WAIT = -1,	/* don't wait at all */
  	UMH_WAIT_EXEC = 0,	/* wait for the exec, but not the process */
  	UMH_WAIT_PROC = 1,	/* wait for the process to complete */
  };
  
  struct subprocess_info {
  	struct work_struct work;
  	struct completion *complete;

  	char *path;
  	char **argv;
  	char **envp;
  	enum umh_wait wait;
  	int retval;

  	int (*init)(struct subprocess_info *info, struct cred *new);

  	void (*cleanup)(struct subprocess_info *info);
  	void *data;
  };

  
  /* Allocate a subprocess_info structure */

  struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
  						  char **envp, gfp_t gfp_mask);

  
  /* Set various pieces of state into the subprocess_info structure */

  void call_usermodehelper_setfns(struct subprocess_info *info,

  		    int (*init)(struct subprocess_info *info, struct cred *new),

  		    void (*cleanup)(struct subprocess_info *info),
  		    void *data);

  /* Actually execute the sub-process */

  int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);

  
  /* Free the subprocess_info. This is only needed if you're not going
     to call call_usermodehelper_exec */
  void call_usermodehelper_freeinfo(struct subprocess_info *info);

  
  static inline int

  call_usermodehelper_fns(char *path, char **argv, char **envp,
  			enum umh_wait wait,

  			int (*init)(struct subprocess_info *info, struct cred *new),

  			void (*cleanup)(struct subprocess_info *), void *data)

  {

  	struct subprocess_info *info;

  	gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;

  	info = call_usermodehelper_setup(path, argv, envp, gfp_mask);

  	if (info == NULL)
  		return -ENOMEM;

  
  	call_usermodehelper_setfns(info, init, cleanup, data);

  	return call_usermodehelper_exec(info, wait);
  }
  
  static inline int

  call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
  {
  	return call_usermodehelper_fns(path, argv, envp, wait,
  				       NULL, NULL, NULL);
  }

  extern struct ctl_table usermodehelper_table[];

  extern void usermodehelper_init(void);

  extern int usermodehelper_disable(void);
  extern void usermodehelper_enable(void);

  extern bool usermodehelper_is_disabled(void);

  extern void read_lock_usermodehelper(void);
  extern void read_unlock_usermodehelper(void);

  #endif /* __LINUX_KMOD_H__ */