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 static inline int 83 call_usermodehelper_fns(char *path, char **argv, char **envp, int wait, 84 int (*init)(struct subprocess_info *info, struct cred *new), 85 void (*cleanup)(struct subprocess_info *), void *data) 86 { 87 struct subprocess_info *info; 88 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 89 90 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 91 92 if (info == NULL) 93 return -ENOMEM; 94 95 call_usermodehelper_setfns(info, init, cleanup, data); 96 97 return call_usermodehelper_exec(info, wait); 98 } 99 100 static inline int 101 call_usermodehelper(char *path, char **argv, char **envp, int wait) 102 { 103 return call_usermodehelper_fns(path, argv, envp, wait, 104 NULL, NULL, NULL); 105 } 106 107 extern struct ctl_table usermodehelper_table[]; 108 109 enum umh_disable_depth { 110 UMH_ENABLED = 0, 111 UMH_FREEZING, 112 UMH_DISABLED, 113 }; 114 115 extern void usermodehelper_init(void); 116 117 extern int __usermodehelper_disable(enum umh_disable_depth depth); 118 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth); 119 120 static inline int usermodehelper_disable(void) 121 { 122 return __usermodehelper_disable(UMH_DISABLED); 123 } 124 125 static inline void usermodehelper_enable(void) 126 { 127 __usermodehelper_set_disable_depth(UMH_ENABLED); 128 } 129 130 extern int usermodehelper_read_trylock(void); 131 extern long usermodehelper_read_lock_wait(long timeout); 132 extern void usermodehelper_read_unlock(void); 133 134 #endif /* __LINUX_KMOD_H__ */ 135