tt_otype_opnum_callback_add(3)ToolTalk Functionstt_otype_opnum_callback_add(3)NAMEtt_otype_opnum_callback_add - return a callback if two opnums are equal
SYNOPSIS
#include <Tt/tt_c.h>
Tt_status tt_otype_opnum_callback_add(const char *otid,
int opnum,
Tt_message_callback f);
DESCRIPTION
The tt_otype_opnum_callback_add() function adds a callback that is
automatically invoked when a message is delivered because it matched a
pattern derived from a signature in the named otype with an opnum equal
to the specified one. The callback is defined in <Tt/tt_c.h>.
The otid argument is the identifier of the object type involved in this
operation. The opnum argument is the opnum of the specified otype.
The f argument is the message callback to be run.
RETURN VALUE
Upon successful completion, the tt_otype_opnum_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_OTYPE
The specified object type is not the name of an installed
object type.
TT_ERR_POINTER
The pointer passed does not point to an object of the cor‐
rect type for this operation.
TT_ERR_NOMP
The ttsession(1) process is not running and the ToolTalk
service cannot restart it.
APPLICATION USAGE
The tt_otype_opnum_callback_add() function will only be called for mes‐
sages delivered by virtue of matching handler signatures. The callback
cannot be called for observer signatures because the observer ptype is
not recorded in the incoming message.
SEE ALSOtt_c(5), tt_message_callback_add(3).
ToolTalk 1.3 1 March 1996 tt_otype_opnum_callback_add(3)
