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 extern char modprobe_path[]; /* for sysctl */ 31 /* modprobe exit status on success, -ve on error. Return value 32 * usually useless though. */ 33 extern int __request_module(bool wait, const char *name, ...) \ 34 __attribute__((format(printf, 2, 3))); 35 #define request_module(mod...) __request_module(true, mod) 36 #define request_module_nowait(mod...) __request_module(false, mod) 37 #define try_then_request_module(x, mod...) \ 38 ((x) ?: (__request_module(true, mod), (x))) 39 #else 40 static inline int request_module(const char *name, ...) { return -ENOSYS; } 41 static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; } 42 #define try_then_request_module(x, mod...) (x) 43 #endif 44 45 46 struct key; 47 struct file; 48 struct subprocess_info; 49 50 /* Allocate a subprocess_info structure */ 51 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, 52 char **envp, gfp_t gfp_mask); 53 54 /* Set various pieces of state into the subprocess_info structure */ 55 void call_usermodehelper_setkeys(struct subprocess_info *info, 56 struct key *session_keyring); 57 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info, 58 struct file **filp); 59 void call_usermodehelper_setcleanup(struct subprocess_info *info, 60 void (*cleanup)(char **argv, char **envp)); 61 62 enum umh_wait { 63 UMH_NO_WAIT = -1, /* don't wait at all */ 64 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ 65 UMH_WAIT_PROC = 1, /* wait for the process to complete */ 66 }; 67 68 /* Actually execute the sub-process */ 69 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait); 70 71 /* Free the subprocess_info. This is only needed if you're not going 72 to call call_usermodehelper_exec */ 73 void call_usermodehelper_freeinfo(struct subprocess_info *info); 74 75 static inline int 76 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) 77 { 78 struct subprocess_info *info; 79 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 80 81 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 82 if (info == NULL) 83 return -ENOMEM; 84 return call_usermodehelper_exec(info, wait); 85 } 86 87 static inline int 88 call_usermodehelper_keys(char *path, char **argv, char **envp, 89 struct key *session_keyring, enum umh_wait wait) 90 { 91 struct subprocess_info *info; 92 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 93 94 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 95 if (info == NULL) 96 return -ENOMEM; 97 98 call_usermodehelper_setkeys(info, session_keyring); 99 return call_usermodehelper_exec(info, wait); 100 } 101 102 extern void usermodehelper_init(void); 103 104 struct file; 105 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[], 106 struct file **filp); 107 108 extern int usermodehelper_disable(void); 109 extern void usermodehelper_enable(void); 110 111 #endif /* __LINUX_KMOD_H__ */ 112