EvmCallback man page on OSF1

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EvmCallback(5)							EvmCallback(5)

NAME
       EvmCallback - Event Management callback function

SYNOPSIS
       void EventCB(
	       EvmConnection_t connection,
	       EvmCallbackArg_t callbackArg,
	       EvmCallbackData_t *callbackData)

DESCRIPTION
       An  EVM	callback function is a function that you provide to allow your
       program to handle messages arriving on an EVM  connection.   Most  mes‐
       sages will be incoming events or responses to requests you have made to
       the EVM daemon, but you may also get a callback for other reasons.

       You specify the name (EventCB) of the callback function in the callback
       parameter  when	you  create  an EVM connection with a response mode of
       callback.

       Your callback function is invoked by EvmConnDispatch(), which you  must
       call whenever you detect activity pending on the connection.

       An EVM callback function must conform to the prototype shown.

   Callback function parameters:
       The  connection parameter contains the connection context pertaining to
       this callback.  This value was returned	by  EvmConnCreate()  when  the
       connection  was	created.  If  you have one callback function servicing
       multiple connections, you might test this to determine which connection
       a  particular  invocation  is handling.	The callbackArg parameter con‐
       tains the value you specified as the callbackArg parameter  to  EvmCon‐
       nCreate()  when	you created the connection. For example, you might use
       it to hold a pointer to your own context data for the connection.   The
       callbackData  parameter points to a structure containing the details of
       the callback.  The structure includes a callback reason code, an event,
       and  a  union  containing  data	specific to each possible reason.  The
       event member may contain NULL if it is not applicable  to  the  reason.
       You may get these reasons: This callback reason indicates that the dae‐
       mon was unable to deliver one or	 more  events,	probably  because  the
       client  process had not finished processing earlier events, causing the
       connection buffer to overflow.  If necessary, you can  use  EvmConnCon‐
       trol(3) to increase the size of the receive buffer.  This callback rea‐
       son indicates that an EVM event has been received from the daemon.  The
       event  is  available  in	 the  callbackData  structure.	 You  must use
       EvmEventDestroy(3) to free the event when you have  finished  with  it.
       This  callback  reason  indicates  that a prior EvmEventPost() call has
       completed, usually with a response from the daemon if the  responseMode
       was  specified as EvmRESPONSE_CALLBACK when the connection was created.
       The posting status is available in the  callbackData  structure.	  This
       callback	 reason indicates that a requested template has been delivered
       in response  to	an  EvmConnRegistrationGet()  request.	You  must  use
       EvmEventDestroy(3) to free the template when you have finished with it.
       This callback reason indicates that a  prior  EvmEventSubscribe()  call
       has  completed, usually with a response from the daemon.	 This callback
       reason indicates that event template information has been delivered  in
       response	 to  an EvmConnTemplateScan() request.	The template is avail‐
       able in the callbackData structure. You must use EvmEventDestroy(3)  to
       free the template when you have finished with it.

       See  the Common Desktop Environment: Programmer's Guide for examples of
       callback functions.

FILES
       Header file that contains the event declaration, structures, and proto‐
       type for the callback function

SEE ALSO
       Routines:   EvmConnCreate(3),   EvmConnCheck(3),	  EvmConnSubscribe(3),
       EvmEventPost(3)

       Event Management: EVM(5)

       Event Connection: EvmConnection(5)

       EVM Events: EvmEvent(5)

       Programmer's Guide

								EvmCallback(5)
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