tt_otype_opnum_callback_add(libraryttc_aoltly)pe_opnum_callback_add(library call)
NAME [Toc] [Back]
tt_otype_opnum_callback_add - return a callback if two opnums are
equal
SYNOPSIS [Toc] [Back]
#include <Tt/tt_c.h>
Tt_status tt_otype_opnum_callback_add(
const char *otid,
int opnum,
Tt_message_callback f);
DESCRIPTION [Toc] [Back]
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 -
Tttt_c(5).
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 [Toc] [Back]
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
correct type for this operation.
TT_ERR_NOMP
The ttsession(1) process is not running and the ToolTalk
service cannot restart it.
APPLICATION USAGE [Toc] [Back]
The tt_otype_opnum_callback_add function will only be called for
messages 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 ALSO [Toc] [Back]
Tt/tt_c.h - Tttt_c(5), tt_message_callback_add(3).
- 1 - Formatted: January 24, 2005 [ Back ] |
