tt_ptype_opnum_callback_add(3)ToolTalk Functionstt_ptype_opnum_callback_add(3)NAMEtt_ptype_opnum_callback_add - return a callback if two opnums are equal
SYNOPSIS
#include <Tt/tt_c.h>
Tt_status tt_ptype_opnum_callback_add(const char *ptid,
int opnum,
Tt_message_callback f);
DESCRIPTION
The tt_ptype_opnum_callback_add() function returns a callback if the
specified opnums are equal. The callback is defined in <Tt/tt_c.h>.
When a message is delivered because it matched a pattern derived from a
signature in the named ptype with an opnum equal to the specified one,
the given callback is run in the usual ToolTalk way.
The ptid argument is the identifier of the ptype involved in this oper‐
ation. The opnum argument is the opnum of the specified ptype. The f
argument is the message callback to be run.
RETURN VALUE
Upon successful completion, the tt_ptype_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_PTYPE
The specified process type is not the name of an installed
process 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_ptype_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).
ToolTalk 1.3 1 March 1996 tt_ptype_opnum_callback_add(3)
