tt_pattern_callback_add(library call) tt_pattern_callback_add(library call)
NAME [Toc] [Back]
tt_pattern_callback_add - register a message-matching callback
function
SYNOPSIS [Toc] [Back]
#include <Tt/tt_c.h>
Tt_status tt_pattern_callback_add(
Tt_pattern m,
Tt_message_callback f);
DESCRIPTION [Toc] [Back]
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 pattern.
The callback is defined in Tt/tt_c.h - Tttt_c(5). 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 [Toc] [Back]
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 [Toc] [Back]
Tt/tt_c.h - Tttt_c(5), tt_pattern_register(3), tt_message_receive(3).
- 1 - Formatted: January 24, 2005 [ Back ] |
