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