PICL Plug-In Library Functions  ptreeregisterhandler(3PICLTRE)



NAME
     ptreeregisterhandler - register a handler for the event

SYNOPSIS
     cc [ flag... ] file... -lpicltree [ library... ]
     #include 

     int ptreeregisterhandler(const char *ename,
          void (*evthandler)(const char *ename, const void *earg,
          sizet size, void *cookie), void *cookie);


DESCRIPTION
     The ptreeregisterhandler()  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  evthandler specifies the event handler func-
     tion. The argument cookie is a  pointer  to  caller-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 evthandler(const char *ename, const void *earg, \
               sizet 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,  respectively.  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 modi-
     fied 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 function.  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.



SunOS 5.11           Last change: 1 Aug 2000                    1






PICL Plug-In Library Functions  ptreeregisterhandler(3PICLTRE)



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 registered.

ERORS
     PICLINVALIDARG    Invalid argument


     PICLFAILURE       General system failure


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Evolving                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     ptreeunregisterhandler(3PICLTRE), attributes(5)


























SunOS 5.11           Last change: 1 Aug 2000                    2