ptree_register_handler(3PICLTREE)			  PICL Plug-In Library Functions			 ptree_register_handler(3PICLTREE)

NAME

       ptree_register_handler - register a handler for the event

SYNOPSIS

       cc [ flag... ] file... -lpicltree [ library... ]
       #include <picltree.h>

       int ptree_register_handler(const char *ename,
	    void (*evt_handler)(const char *ename, const void *earg,
	    size_t size, void *cookie), void *cookie);

DESCRIPTION

       The  ptree_register_handler() function registers an event handler for a PICL event. The argument ename specifies the name of the PICL event
       for which to register the handler. The argument evt_handler specifies the event handler function. The argument cookie is a pointer to call-
       er-specific data to be passed as an argument to the event handler when it is invoked.

       The event handler function must be defined as

	 void evt_handler(const char *ename, const void *earg, 
		 size_t size, void *cookie)

       where, ename, earg, size, and cookie are the arguments passed to the event handler when it is invoked. The argument ename is the PICL event
       name for which the handler is invoked. The arguments earg and size gives the pointer to the event argument buffer  and  its  size,  respec-
       tively.	The  argument cookie is the pointer to the caller specific data registered with the handler. The arguments ename and earg point to
       buffers that are transient and shall not be modified by the event handler or reused after the event handler finishes execution.

       The PICL framework invokes the event handlers in the order in which they were registered when dispatching an event. If  the  event  handler
       execution order is required to be the same as the plug-in dependency order, then a plug-in should register its handlers from its init func-
       tion. The handlers that do not have any ordering dependencies on other plug-in handlers can be registered at any time.

       The registered handler may be called at any time after this function is called.

RETURN VALUES

       Upon successful completion, 0 is returned. On failure, a non-negative integer is returned to indicate an error and the handler is not  reg-
       istered.

ERRORS

       PICL_INVALIDARG	  Invalid argument

       PICL_FAILURE	  General system failure

ATTRIBUTES

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

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

SEE ALSO

       ptree_unregister_handler(3PICLTREE), attributes(5)

SunOS 5.11							    1 Aug 2000					 ptree_register_handler(3PICLTREE)