include/linux/umh.h

   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
  55 static inline int usermodehelper_disable(void)
  56 {
  57         return __usermodehelper_disable(UMH_DISABLED);
  58 }
  59
  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__ */