1 #ifndef __LINUX_UMH_H__
2 #define __LINUX_UMH_H__
3 
4 #include <linux/gfp.h>
5 #include <linux/stddef.h>
6 #include <linux/errno.h>
7 #include <linux/compiler.h>
8 #include <linux/workqueue.h>
9 #include <linux/sysctl.h>
10 
11 struct cred;
12 struct file;
13 
14 #define UMH_NO_WAIT	0	/* don't wait at all */
15 #define UMH_WAIT_EXEC	1	/* wait for the exec, but not the process */
16 #define UMH_WAIT_PROC	2	/* wait for the process to complete */
17 #define UMH_KILLABLE	4	/* wait for EXEC/PROC killable */
18 
19 struct subprocess_info {
20 	struct work_struct work;
21 	struct completion *complete;
22 	const char *path;
23 	char **argv;
24 	char **envp;
25 	int wait;
26 	int retval;
27 	int (*init)(struct subprocess_info *info, struct cred *new);
28 	void (*cleanup)(struct subprocess_info *info);
29 	void *data;
30 } __randomize_layout;
31 
32 extern int
33 call_usermodehelper(const char *path, char **argv, char **envp, int wait);
34 
35 extern struct subprocess_info *
36 call_usermodehelper_setup(const char *path, char **argv, char **envp,
37 			  gfp_t gfp_mask,
38 			  int (*init)(struct subprocess_info *info, struct cred *new),
39 			  void (*cleanup)(struct subprocess_info *), void *data);
40 
41 extern int
42 call_usermodehelper_exec(struct subprocess_info *info, int wait);
43 
44 extern struct ctl_table usermodehelper_table[];
45 
46 enum umh_disable_depth {
47 	UMH_ENABLED = 0,
48 	UMH_FREEZING,
49 	UMH_DISABLED,
50 };
51 
52 extern int __usermodehelper_disable(enum umh_disable_depth depth);
53 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
54 
usermodehelper_disable(void)55 static inline int usermodehelper_disable(void)
56 {
57 	return __usermodehelper_disable(UMH_DISABLED);
58 }
59 
usermodehelper_enable(void)60 static inline void usermodehelper_enable(void)
61 {
62 	__usermodehelper_set_disable_depth(UMH_ENABLED);
63 }
64 
65 extern int usermodehelper_read_trylock(void);
66 extern long usermodehelper_read_lock_wait(long timeout);
67 extern void usermodehelper_read_unlock(void);
68 
69 #endif /* __LINUX_UMH_H__ */
70