1 #ifndef __LINUX_KMOD_H__

     2 #define __LINUX_KMOD_H__

     3 

     4 /*

     5  *	include/linux/kmod.h

     6  *

     7  *      This program is free software; you can redistribute it and/or modify

     8  *      it under the terms of the GNU General Public License as published by

     9  *      the Free Software Foundation; either version 2 of the License, or

    10  *      (at your option) any later version.

    11  *

    12  *      This program is distributed in the hope that it will be useful,

    13  *      but WITHOUT ANY WARRANTY; without even the implied warranty of

    14  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15  *      GNU General Public License for more details.

    16  *

    17  *      You should have received a copy of the GNU General Public License

    18  *      along with this program; if not, write to the Free Software

    19  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    20  */

    21 

    22 #include <linux/gfp.h>

    23 #include <linux/stddef.h>

    24 #include <linux/errno.h>

    25 #include <linux/compiler.h>

    26 

    27 #define KMOD_PATH_LEN 256

    28 

    29 #ifdef CONFIG_MODULES

    30 /* modprobe exit status on success, -ve on error.  Return value

    31  * usually useless though. */

    32 extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));

    33 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))

    34 #else

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

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

    37 #endif

    38 

    39 

    40 struct key;

    41 struct file;

    42 struct subprocess_info;

    43 

    44 /* Allocate a subprocess_info structure */

    45 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,

    46 						  char **envp, gfp_t gfp_mask);

    47 

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

    49 void call_usermodehelper_setkeys(struct subprocess_info *info,

    50 				 struct key *session_keyring);

    51 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,

    52 				  struct file **filp);

    53 void call_usermodehelper_setcleanup(struct subprocess_info *info,

    54 				    void (*cleanup)(char **argv, char **envp));

    55 

    56 enum umh_wait {

    57 	UMH_NO_WAIT = -1,	/* don't wait at all */

    58 	UMH_WAIT_EXEC = 0,	/* wait for the exec, but not the process */

    59 	UMH_WAIT_PROC = 1,	/* wait for the process to complete */

    60 };

    61 

    62 /* Actually execute the sub-process */

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

    64 

    65 /* Free the subprocess_info. This is only needed if you're not going

    66    to call call_usermodehelper_exec */

    67 void call_usermodehelper_freeinfo(struct subprocess_info *info);

    68 

    69 static inline int

    70 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)

    71 {

    72 	struct subprocess_info *info;

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

    74 

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

    76 	if (info == NULL)

    77 		return -ENOMEM;

    78 	return call_usermodehelper_exec(info, wait);

    79 }

    80 

    81 static inline int

    82 call_usermodehelper_keys(char *path, char **argv, char **envp,

    83 			 struct key *session_keyring, enum umh_wait wait)

    84 {

    85 	struct subprocess_info *info;

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

    87 

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

    89 	if (info == NULL)

    90 		return -ENOMEM;

    91 

    92 	call_usermodehelper_setkeys(info, session_keyring);

    93 	return call_usermodehelper_exec(info, wait);

    94 }

    95 

    96 extern void usermodehelper_init(void);

    97 

    98 struct file;

    99 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],

   100 				    struct file **filp);

   101 

   102 extern int usermodehelper_disable(void);

   103 extern void usermodehelper_enable(void);

   104 

   105 #endif /* __LINUX_KMOD_H__ */