tt_otype_opnum_callback_add(3)

tt_otype_opnum_callbackCaLIBRARY FUtt_otype_opnum_callback_add(3)

NAME
     tt_otype_opnum_callback_add  -  return  a	callback  if  two
     opnums are	equal

SYNOPSIS
     #include <Tt/tt_c.h>

     Tt_status tt_otype_opnum_callback_add(const char *otid,
					   int opnum,
					   Tt_message_callback f);

DESCRIPTION
     The tt_otype_opnum_callback_add() function	adds  a	 callback
     that  is  automatically  invoked when a message is	delivered
     because it	matched	a pattern derived from a signature in the
     named  otype  with	an opnum equal to the specified	one.  The
     callback is defined in <Tt/tt_c.h>.

     The otid argument is  the	identifier  of	the  object  type
     involved in this operation.  The opnum argument is	the opnum
     of	the specified otype.  The f argument is	the message call-
     back to be	run.

RETURN VALUE
     Upon	   successful		completion,	      the
     tt_otype_opnum_callback_add() function returns the	status of
     the operation as one of the following Tt_status values:

	TT_OK	The operation completed	successfully.

	TT_ERR_OTYPE
		The specified object type is not the name  of  an
		installed object type.

	TT_ERR_POINTER
		The pointer passed does	not point to an	object of
		the correct type for this operation.

	TT_ERR_NOMP
		The ttsession(1) process is not	running	 and  the
		ToolTalk service cannot	restart	it.

APPLICATION USAGE
     The  tt_otype_opnum_callback_add()	 function  will	 only  be
     called  for messages delivered by virtue of matching handler
     signatures.  The callback cannot be called	for observer sig-
     natures  because  the  observer ptype is not recorded in the
     incoming message.

SEE ALSO
     Tttt_c(5),	tt_message_callback_add(3).

Unix System LaboratorLast change: 11 May 1994			1