tt_pattern_callback_add(library call) tt_pattern_callback_add(library call)
NAMEtt_pattern_callback_add — register a message-matching callback 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 mes‐
sage 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 call‐
back 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 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)
