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     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__ */