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#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__ */