tt_pattern_callback_add(3)

tt_pattern_callback_addC3LIBRARY FUNCTItt_pattern_callback_add(3)

NAME
     tt_pattern_callback_add - register	a message-matching  call-
     back function

SYNOPSIS
     #include <Tt/tt_c.h>

     Tt_status tt_pattern_callback_add(Tt_pattern m,
				       Tt_message_callback f);

DESCRIPTION
     The tt_pattern_callback_add() function registers a	 callback
     function	 that	 will	be   automatically   invoked   by
     tt_message_receive(3) whenever a message  matches	the  pat-
     tern.

     The callback is defined in	 <Tt/tt_c.h>.	If  the	 callback
     returns  TT_CALLBACK_CONTINUE,  other callbacks will be run;
     if	   no	  callback     returns	   TT_CALLBACK_PROCESSED,
     tt_message_receive(3)  returns the	message.  If the callback
     returns TT_CALLBACK_PROCESSED, no further callbacks will  be
     invoked  for  this	 event;	 tt_message_receive(3)	does  not
     return the	message.

     The m argument is the opaque handle for the pattern involved
     in	this operation.

     The f argument is the message callback to be run.

RETURN VALUE
     Upon successful  completion,  the	tt_pattern_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_NOMP
		The ttsession(1) process is not	running	 and  the
		ToolTalk service cannot	restart	it.

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

SEE ALSO
     Tttt_c(5),	tt_pattern_register(3),	tt_message_receive(3).

Unix System LaboratorLast change: 11 May 1994			1