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_MODULES 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 #define try_then_request_module(x, mod...) ((x) ?: (request_module(mod), (x))) 33 #else 34 static inline int request_module(const char * name, ...) { return -ENOSYS; } 35 #define try_then_request_module(x, mod...) (x) 36 #endif 37 38 39 struct key; 40 struct file; 41 struct subprocess_info; 42 43 /* Allocate a subprocess_info structure */ 44 struct subprocess_info *call_usermodehelper_setup(char *path, 45 char **argv, char **envp); 46 47 /* Set various pieces of state into the subprocess_info structure */ 48 void call_usermodehelper_setkeys(struct subprocess_info *info, 49 struct key *session_keyring); 50 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info, 51 struct file **filp); 52 void call_usermodehelper_setcleanup(struct subprocess_info *info, 53 void (*cleanup)(char **argv, char **envp)); 54 55 enum umh_wait { 56 UMH_NO_WAIT = -1, /* don't wait at all */ 57 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ 58 UMH_WAIT_PROC = 1, /* wait for the process to complete */ 59 }; 60 61 /* Actually execute the sub-process */ 62 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait); 63 64 /* Free the subprocess_info. This is only needed if you're not going 65 to call call_usermodehelper_exec */ 66 void call_usermodehelper_freeinfo(struct subprocess_info *info); 67 68 static inline int 69 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) 70 { 71 struct subprocess_info *info; 72 73 info = call_usermodehelper_setup(path, argv, envp); 74 if (info == NULL) 75 return -ENOMEM; 76 return call_usermodehelper_exec(info, wait); 77 } 78 79 static inline int 80 call_usermodehelper_keys(char *path, char **argv, char **envp, 81 struct key *session_keyring, enum umh_wait wait) 82 { 83 struct subprocess_info *info; 84 85 info = call_usermodehelper_setup(path, argv, envp); 86 if (info == NULL) 87 return -ENOMEM; 88 89 call_usermodehelper_setkeys(info, session_keyring); 90 return call_usermodehelper_exec(info, wait); 91 } 92 93 extern void usermodehelper_init(void); 94 95 struct file; 96 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[], 97 struct file **filp); 98 99 #endif /* __LINUX_KMOD_H__ */ 100