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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
request_module(const char * name,...)42 static inline int request_module(const char *name, ...) { return -ENOSYS; }
request_module_nowait(const char * name,...)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 extern int
70 call_usermodehelper(char *path, char **argv, char **envp, int wait);
71 
72 extern struct subprocess_info *
73 call_usermodehelper_setup(char *path, char **argv, char **envp, gfp_t gfp_mask,
74 			  int (*init)(struct subprocess_info *info, struct cred *new),
75 			  void (*cleanup)(struct subprocess_info *), void *data);
76 
77 extern int
78 call_usermodehelper_exec(struct subprocess_info *info, int wait);
79 
80 extern struct ctl_table usermodehelper_table[];
81 
82 enum umh_disable_depth {
83 	UMH_ENABLED = 0,
84 	UMH_FREEZING,
85 	UMH_DISABLED,
86 };
87 
88 extern void usermodehelper_init(void);
89 
90 extern int __usermodehelper_disable(enum umh_disable_depth depth);
91 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
92 
usermodehelper_disable(void)93 static inline int usermodehelper_disable(void)
94 {
95 	return __usermodehelper_disable(UMH_DISABLED);
96 }
97 
usermodehelper_enable(void)98 static inline void usermodehelper_enable(void)
99 {
100 	__usermodehelper_set_disable_depth(UMH_ENABLED);
101 }
102 
103 extern int usermodehelper_read_trylock(void);
104 extern long usermodehelper_read_lock_wait(long timeout);
105 extern void usermodehelper_read_unlock(void);
106 
107 #endif /* __LINUX_KMOD_H__ */
108