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NetBSD 6.1.5 - man page for undelete (netbsd section 2)

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UNDELETE(2)			     BSD System Calls Manual			      UNDELETE(2)

     undelete -- remove whiteout

     Standard C Library (libc, -lc)

     #include <unistd.h>

     undelete(const char *path);

     Currently undelete works only when the named object is a whiteout in a union filesystem.
     The system call removes the whiteout causing any objects in a lower layer of the union stack
     to become visible once more.

     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned
     and errno is set to indicate the error.

     The undelete() succeeds unless:

     [EACCES]	     Search permission is denied for a component of the path prefix, or write
		     permission is denied on the directory containing the name to be undeleted.

     [EEXIST]	     The path does not reference a whiteout.

     [EFAULT]	     path points outside the process's allocated address space.

     [EINVAL]	     The pathname contains a character with the high-order bit set.

     [EIO]	     An I/O error occurred while updating the directory entry.

     [ELOOP]	     Too many symbolic links were encountered in translating the pathname.

     [ENAMETOOLONG]  A component of a pathname exceeded 255 characters, or an entire path name
		     exceeded 1023 characters.

     [ENOENT]	     The named whiteout does not exist.

     [ENOTDIR]	     A component of the path prefix is not a directory.

     [EPERM]	     The directory containing the name is marked sticky, and the containing
		     directory is not owned by the effective user ID.

     [EROFS]	     The name resides on a read-only file system.

     unlink(2), mount_union(8)

     An undelete function call first appeared in 4.4BSD -Lite.

BSD					November 28, 2008				      BSD
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