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 28 #define KMOD_PATH_LEN 256 29 30 #ifdef CONFIG_MODULES 31 extern char modprobe_path[]; /* for sysctl */ 32 /* modprobe exit status on success, -ve on error. Return value 33 * usually useless though. */ 34 extern int __request_module(bool wait, const char *name, ...) \ 35 __attribute__((format(printf, 2, 3))); 36 #define request_module(mod...) __request_module(true, mod) 37 #define request_module_nowait(mod...) __request_module(false, mod) 38 #define try_then_request_module(x, mod...) \ 39 ((x) ?: (__request_module(true, mod), (x))) 40 #else 41 static inline int request_module(const char *name, ...) { return -ENOSYS; } 42 static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; } 43 #define try_then_request_module(x, mod...) (x) 44 #endif 45 46 47 struct key; 48 struct file; 49 50 enum umh_wait { 51 UMH_NO_WAIT = -1, /* don't wait at all */ 52 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ 53 UMH_WAIT_PROC = 1, /* wait for the process to complete */ 54 }; 55 56 struct subprocess_info { 57 struct work_struct work; 58 struct completion *complete; 59 char *path; 60 char **argv; 61 char **envp; 62 enum umh_wait wait; 63 int retval; 64 int (*init)(struct subprocess_info *info); 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), 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, enum umh_wait 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, 88 enum umh_wait wait, 89 int (*init)(struct subprocess_info *info), 90 void (*cleanup)(struct subprocess_info *), void *data) 91 { 92 struct subprocess_info *info; 93 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 94 95 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 96 97 if (info == NULL) 98 return -ENOMEM; 99 100 call_usermodehelper_setfns(info, init, cleanup, data); 101 102 return call_usermodehelper_exec(info, wait); 103 } 104 105 static inline int 106 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) 107 { 108 return call_usermodehelper_fns(path, argv, envp, wait, 109 NULL, NULL, NULL); 110 } 111 112 extern void usermodehelper_init(void); 113 114 extern int usermodehelper_disable(void); 115 extern void usermodehelper_enable(void); 116 117 #endif /* __LINUX_KMOD_H__ */ 118