di_child_node(3DEVINFO) 			       Device Information Library Functions				   di_child_node(3DEVINFO)

NAME

       di_child_node, di_parent_node, di_sibling_node, di_drv_first_node, di_drv_next_node - libdevinfo node traversal functions

SYNOPSIS

       cc [ flag... ] file... -ldevinfo [ library... ]
       #include <libdevinfo.h>

       di_node_t di_child_node(di_node_t node);

       di_node_t di_parent_node(di_node_t node);

       di_node_t di_sibling_node(di_node_t node);

       di_node_t di_drv_first_node(const char *drv_name, di_node_t root);

       di_node_t di_drv_next_node(di_node_t node);

PARAMETERS

       drv_name        The name of the driver of interest.

       node	       A  handle to any node in the snapshot.

       root	       The handle of the root node for the snapshot returned by di_init(3DEVINFO).

DESCRIPTION

       The  kernel  device  configuration  data  may be viewed in two ways, either as a tree of device	configuration nodes or as a  list of nodes
       associated with each driver. In the tree view, each node may contain references to  its parent, the next sibling in a list of siblings, and
       the  first  child  of  a list of children. In the per-driver view, each node contains a reference to the next node associated with the same
       driver. Both views are captured in the snapshot, and the interfaces are provided for node  access.

       The di_child_node() function obtains a handle to the first child of node. If no child node exists in the snapshot, DI_NODE_NIL is  returned
       and errno is set to ENXIO or ENOTSUP.

       The  di_parent_node()  function	obtains  a  handle  to	the  parent node of node. If no parent node exists in the snapshot, DI_NODE_NIL is
       returned and errno is set to ENXIO or ENOTSUP.

       The di_sibling_node() function obtains a handle to the next sibling node of node.  If  no  next	sibling   node	exists	in  the  snapshot,
       DI_NODE_NIL is returned and errno is set to ENXIO or ENOTSUP.

       The  di_drv_first_node()  function obtains a handle to the first node associated with the driver specified by drv_name. If there is no such
       driver, DI_NODE_NIL is returned with errno is set to EINVAL.  If the driver exists but there  is  no  node  associated  with  this  driver,
       DI_NODE_NIL is  returned and errno is set to ENXIO or ENOTSUP.

       The  di_drv_next_node()	function  returns  a  handle  to  the  next  node bound to the same driver. If no more nodes exist, DI_NODE_NIL is
       returned.

RETURN VALUES

       Upon successful completion, a handle is returned. Otherwise,  DI_NODE_NIL is returned and errno is set to indicate the error.

ERRORS

       These functions will fail if:

       EINVAL	       The argument is invalid.

       ENXIO	       The requested node does not exist.

       ENOTSUP	       The node was not found in the snapshot, but it may exist in the kernel. This error may occur if	the  snapshot  contains  a
		       partial device tree.

ATTRIBUTES

       See attributes(5)  for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       di_init(3DEVINFO), libdevinfo(3LIB), attributes(5)

       Writing Device Drivers

SunOS 5.10							    1 Dec 1998						   di_child_node(3DEVINFO)