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__ */ 99