get_futex_key man page on OpenSuSE

get_futex_key man page on OpenSuSE

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GET_FUTEX_KEY(9)	      Futex API reference	      GET_FUTEX_KEY(9)

NAME
       get_futex_key - Get parameters which are the keys for a futex

SYNOPSIS
       int get_futex_key(u32 __user * uaddr, int fshared,
			 union futex_key * key, int rw);

ARGUMENTS
       uaddr
	   virtual address of the futex

       fshared
	   0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED

       key
	   address where result is stored.

       rw
	   mapping needs to be read/write (values: VERIFY_READ, VERIFY_WRITE)

RETURN
       a negative error code or 0

       The key words are stored in *key on success.

       For shared mappings, it's (page->index, file_inode(vma->vm_file),
       offset_within_page). For private mappings, it's (uaddr, current->mm).
       We can usually work out the index without swapping in the page.

       lock_page might sleep, the caller should not hold a spinlock.

AUTHOR
       Rusty Russell <rusty@rustcorp.com.au>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.11	 November 2013		      GET_FUTEX_KEY(9)

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