#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/stddef.h>

  #include <linux/errno.h>
  #include <linux/compiler.h>
  
  #define KMOD_PATH_LEN 256
  
  #ifdef CONFIG_KMOD
  /* modprobe exit status on success, -ve on error.  Return value
   * usually useless though. */
  extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
  #else
  static inline int request_module(const char * name, ...) { return -ENOSYS; }
  #endif
  
  #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))

  
  struct key;

  struct file;
  struct subprocess_info;
  
  /* Allocate a subprocess_info structure */
  struct subprocess_info *call_usermodehelper_setup(char *path,
  						  char **argv, char **envp);
  
  /* Set various pieces of state into the subprocess_info structure */
  void call_usermodehelper_setkeys(struct subprocess_info *info,
  				 struct key *session_keyring);
  int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
  				  struct file **filp);
  void call_usermodehelper_setcleanup(struct subprocess_info *info,
  				    void (*cleanup)(char **argv, char **envp));

  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 */
  };

  /* 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(char *path, char **argv, char **envp, enum umh_wait wait)

  {

  	struct subprocess_info *info;
  
  	info = call_usermodehelper_setup(path, argv, envp);
  	if (info == NULL)
  		return -ENOMEM;
  	return call_usermodehelper_exec(info, wait);
  }
  
  static inline int
  call_usermodehelper_keys(char *path, char **argv, char **envp,

  			 struct key *session_keyring, enum umh_wait wait)

  {
  	struct subprocess_info *info;
  
  	info = call_usermodehelper_setup(path, argv, envp);
  	if (info == NULL)
  		return -ENOMEM;
  
  	call_usermodehelper_setkeys(info, session_keyring);
  	return call_usermodehelper_exec(info, wait);

  }

  extern void usermodehelper_init(void);

  struct file;
  extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
  				    struct file **filp);

  #endif /* __LINUX_KMOD_H__ */