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tt_pattern_callback_add(library	call)	 tt_pattern_callback_add(library call)

NAME
       tt_pattern_callback_add	--  register a message-matching	callback func-
       tion

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 mes-
       sage matches the	pattern.

       The callback is defined in Tt/tt_c.h - Tttt_c(5). If the	 callback  re-
       turns TT_CALLBACK_CONTINUE, other callbacks will	be run;	if no callback
       returns TT_CALLBACK_PROCESSED, tt_message_receive(3) returns  the  mes-
       sage.   If the callback returns TT_CALLBACK_PROCESSED, no further call-
       backs 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  re-
       turns  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 ser-
		 vice cannot restart it.

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

SEE ALSO
       Tt/tt_c.h - Tttt_c(5), tt_pattern_register(3), tt_message_receive(3).

					 tt_pattern_callback_add(library call)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO

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