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 #include <linux/workqueue.h> 27 #include <linux/sysctl.h> 28 29 #define KMOD_PATH_LEN 256 30 31 #ifdef CONFIG_MODULES 32 extern char modprobe_path[]; /* for sysctl */ 33 /* modprobe exit status on success, -ve on error. Return value 34 * usually useless though. */ 35 extern __printf(2, 3) 36 int __request_module(bool wait, const char *name, ...); 37 #define request_module(mod...) __request_module(true, mod) 38 #define request_module_nowait(mod...) __request_module(false, mod) 39 #define try_then_request_module(x, mod...) \ 40 ((x) ?: (__request_module(true, mod), (x))) 41 #else 42 static inline int request_module(const char *name, ...) { return -ENOSYS; } 43 static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; } 44 #define try_then_request_module(x, mod...) (x) 45 #endif 46 47 48 struct cred; 49 struct file; 50 51 #define UMH_NO_WAIT 0 /* don't wait at all */ 52 #define UMH_WAIT_EXEC 1 /* wait for the exec, but not the process */ 53 #define UMH_WAIT_PROC 2 /* wait for the process to complete */ 54 #define UMH_KILLABLE 4 /* wait for EXEC/PROC killable */ 55 56 struct subprocess_info { 57 struct work_struct work; 58 struct completion *complete; 59 char *path; 60 char **argv; 61 char **envp; 62 int wait; 63 int retval; 64 int (*init)(struct subprocess_info *info, struct cred *new); 65 void (*cleanup)(struct subprocess_info *info); 66 void *data; 67 }; 68 69 /* Allocate a subprocess_info structure */ 70 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, 71 char **envp, gfp_t gfp_mask); 72 73 /* Set various pieces of state into the subprocess_info structure */ 74 void call_usermodehelper_setfns(struct subprocess_info *info, 75 int (*init)(struct subprocess_info *info, struct cred *new), 76 void (*cleanup)(struct subprocess_info *info), 77 void *data); 78 79 /* Actually execute the sub-process */ 80 int call_usermodehelper_exec(struct subprocess_info *info, int wait); 81 82 /* Free the subprocess_info. This is only needed if you're not going 83 to call call_usermodehelper_exec */ 84 void call_usermodehelper_freeinfo(struct subprocess_info *info); 85 86 static inline int 87 call_usermodehelper_fns(char *path, char **argv, char **envp, int wait, 88 int (*init)(struct subprocess_info *info, struct cred *new), 89 void (*cleanup)(struct subprocess_info *), void *data) 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 96 if (info == NULL) 97 return -ENOMEM; 98 99 call_usermodehelper_setfns(info, init, cleanup, data); 100 101 return call_usermodehelper_exec(info, wait); 102 } 103 104 static inline int 105 call_usermodehelper(char *path, char **argv, char **envp, int wait) 106 { 107 return call_usermodehelper_fns(path, argv, envp, wait, 108 NULL, NULL, NULL); 109 } 110 111 extern struct ctl_table usermodehelper_table[]; 112 113 enum umh_disable_depth { 114 UMH_ENABLED = 0, 115 UMH_FREEZING, 116 UMH_DISABLED, 117 }; 118 119 extern void usermodehelper_init(void); 120 121 extern int __usermodehelper_disable(enum umh_disable_depth depth); 122 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth); 123 124 static inline int usermodehelper_disable(void) 125 { 126 return __usermodehelper_disable(UMH_DISABLED); 127 } 128 129 static inline void usermodehelper_enable(void) 130 { 131 __usermodehelper_set_disable_depth(UMH_ENABLED); 132 } 133 134 extern int usermodehelper_read_trylock(void); 135 extern long usermodehelper_read_lock_wait(long timeout); 136 extern void usermodehelper_read_unlock(void); 137 138 #endif /* __LINUX_KMOD_H__ */ 139