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tt_pattern_callback_add(3)


CDE




NAME

  tt_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_receive3 whenever a message
  matches the pattern.

  The callback is defined in Tt/tt_c.h5.  If the callback returns
  TT_CALLBACK_CONTINUE, other callbacks will be run; if no callback returns
  TT_CALLBACK_PROCESSED, tt_message_receive3 returns the message.  If the
  callback returns TT_CALLBACK_PROCESSED, no further callbacks will be
  invoked for this event; tt_message_receive3 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: The
  operation completed successfully.
  The ttsession1 process is not running and the ToolTalk service cannot
  restart it.
  The pointer passed does not point to an object of the correct type for this
  operation.


SEE ALSO

  Tt/tt_c.h5, tt_pattern_register3, tt_message_receive3.