include/linux/kmod.h

   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/stddef.h>
  23 #include <linux/errno.h>
  24 #include <linux/compiler.h>
  25
  26 #define KMOD_PATH_LEN 256
  27
  28 #ifdef CONFIG_KMOD
  29 /* modprobe exit status on success, -ve on error.  Return value
  30  * usually useless though. */
  31 extern int request_module(const char * name, ...) __attribute__ ((format (printf, 1, 2)));
  32 #else
  33 static inline int request_module(const char * name, ...) { return -ENOSYS; }
  34 #endif
  35
  36 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x)))
  37
  38 struct key;
  39 struct file;
  40 struct subprocess_info;
  41
  42 /* Allocate a subprocess_info structure */
  43 struct subprocess_info *call_usermodehelper_setup(char *path,
  44                                                   char **argv, char **envp);
  45
  46 /* Set various pieces of state into the subprocess_info structure */
  47 void call_usermodehelper_setkeys(struct subprocess_info *info,
  48                                  struct key *session_keyring);
  49 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
  50                                   struct file **filp);
  51 void call_usermodehelper_setcleanup(struct subprocess_info *info,
  52                                     void (*cleanup)(char **argv, char **envp));
  53
  54 enum umh_wait {
  55         UMH_NO_WAIT = -1,       /* don't wait at all */
  56         UMH_WAIT_EXEC = 0,      /* wait for the exec, but not the process */
  57         UMH_WAIT_PROC = 1,      /* wait for the process to complete */
  58 };
  59
  60 /* Actually execute the sub-process */
  61 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
  62
  63 /* Free the subprocess_info. This is only needed if you're not going
  64    to call call_usermodehelper_exec */
  65 void call_usermodehelper_freeinfo(struct subprocess_info *info);
  66
  67 static inline int
  68 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
  69 {
  70         struct subprocess_info *info;
  71
  72         info = call_usermodehelper_setup(path, argv, envp);
  73         if (info == NULL)
  74                 return -ENOMEM;
  75         return call_usermodehelper_exec(info, wait);
  76 }
  77
  78 static inline int
  79 call_usermodehelper_keys(char *path, char **argv, char **envp,
  80                          struct key *session_keyring, enum umh_wait wait)
  81 {
  82         struct subprocess_info *info;
  83
  84         info = call_usermodehelper_setup(path, argv, envp);
  85         if (info == NULL)
  86                 return -ENOMEM;
  87
  88         call_usermodehelper_setkeys(info, session_keyring);
  89         return call_usermodehelper_exec(info, wait);
  90 }
  91
  92 extern void usermodehelper_init(void);
  93
  94 struct file;
  95 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
  96                                     struct file **filp);
  97
  98 #endif /* __LINUX_KMOD_H__ */