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