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 0x00 /* don't wait at all */
15 #define UMH_WAIT_EXEC 0x01 /* wait for the exec, but not the process */
16 #define UMH_WAIT_PROC 0x02 /* wait for the process to complete */
17 #define UMH_KILLABLE 0x04 /* wait for EXEC/PROC killable */
18 #define UMH_FREEZABLE 0x08 /* wait for EXEC/PROC freezable */
19
20 struct subprocess_info {
21 struct work_struct work;
22 struct completion *complete;
23 const char *path;
24 char **argv;
25 char **envp;
26 int wait;
27 int retval;
28 int (*init)(struct subprocess_info *info, struct cred *new);
29 void (*cleanup)(struct subprocess_info *info);
30 void *data;
31 } __randomize_layout;
32
33 extern int
34 call_usermodehelper(const char *path, char **argv, char **envp, int wait);
35
36 extern struct subprocess_info *
37 call_usermodehelper_setup(const char *path, char **argv, char **envp,
38 gfp_t gfp_mask,
39 int (*init)(struct subprocess_info *info, struct cred *new),
40 void (*cleanup)(struct subprocess_info *), void *data);
41
42 extern int
43 call_usermodehelper_exec(struct subprocess_info *info, int wait);
44
45 enum umh_disable_depth {
46 UMH_ENABLED = 0,
47 UMH_FREEZING,
48 UMH_DISABLED,
49 };
50
51 extern int __usermodehelper_disable(enum umh_disable_depth depth);
52 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
53
54 static inline int usermodehelper_disable(void)
55 {
56 return __usermodehelper_disable(UMH_DISABLED);
57 }
58
59 static inline void usermodehelper_enable(void)
60 {
61 __usermodehelper_set_disable_depth(UMH_ENABLED);
62 }
63
64 extern int usermodehelper_read_trylock(void);
65 extern long usermodehelper_read_lock_wait(long timeout);
66 extern void usermodehelper_read_unlock(void);
67
68 #endif /* __LINUX_UMH_H__ */
69
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