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 struct file *file;
26 int wait;
27 int retval;
28 pid_t pid;
29 int (*init)(struct subprocess_info *info, struct cred *new);
30 void (*cleanup)(struct subprocess_info *info);
31 void *data;
32 } __randomize_layout;
33
34 extern int
35 call_usermodehelper(const char *path, char **argv, char **envp, int wait);
36
37 extern struct subprocess_info *
38 call_usermodehelper_setup(const char *path, char **argv, char **envp,
39 gfp_t gfp_mask,
40 int (*init)(struct subprocess_info *info, struct cred *new),
41 void (*cleanup)(struct subprocess_info *), void *data);
42
43 struct subprocess_info *call_usermodehelper_setup_file(struct file *file,
44 int (*init)(struct subprocess_info *info, struct cred *new),
45 void (*cleanup)(struct subprocess_info *), void *data);
46 struct umh_info {
47 struct file *pipe_to_umh;
48 struct file *pipe_from_umh;
49 pid_t pid;
50 };
51 int fork_usermode_blob(void *data, size_t len, struct umh_info *info);
52
53 extern int
54 call_usermodehelper_exec(struct subprocess_info *info, int wait);
55
56 extern struct ctl_table usermodehelper_table[];
57
58 enum umh_disable_depth {
59 UMH_ENABLED = 0,
60 UMH_FREEZING,
61 UMH_DISABLED,
62 };
63
64 extern int __usermodehelper_disable(enum umh_disable_depth depth);
65 extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
66
usermodehelper_disable(void)67 static inline int usermodehelper_disable(void)
68 {
69 return __usermodehelper_disable(UMH_DISABLED);
70 }
71
usermodehelper_enable(void)72 static inline void usermodehelper_enable(void)
73 {
74 __usermodehelper_set_disable_depth(UMH_ENABLED);
75 }
76
77 extern int usermodehelper_read_trylock(void);
78 extern long usermodehelper_read_lock_wait(long timeout);
79 extern void usermodehelper_read_unlock(void);
80
81 #endif /* __LINUX_UMH_H__ */
82
