Quit(4) Desktop Services Message Sets Quit(4)NAMEQuit - terminate an operation or an entire tool
SYNOPSIS
Quit(in boolean silent,
in boolean force
[in messageID operation2Quit]);
DESCRIPTION
The Quit request terminates an operation or an entire tool. Without
the optional operation2Quit argument, this request asks the handling
procid to quit. If the request succeeds, one or more ToolTalk procids
should call tt_close(3), and zero or more processes should exit.
With the optional operation2Quit argument, this request asks the han‐
dler to terminate the indicated request. (Whether the terminated
request must therefore be failed depends on its semantics. Often, ter‐
mination can be considered to mean that the requested operation has
been carried out to the requester's satisfaction.)
The Quit request should be failed (and the status code set appropri‐
ately) when the termination is not performed—for example, because the
silent argument was false and the user canceled the quit.
The silent argument affects user notification of termination. If
silent is True, the handler is not allowed to block on user input
before terminating itself (or the indicated operation). If it is
False, however, the handler may seek such input.
The force argument is a Boolean value indicating whether the handler
should terminate itself (or the indicated operation) even if circum‐
stances are such that the tool ordinarily would not perform the termi‐
nation.
For example, a tool might have a policy of not quitting with unsaved
changes unless the user has been asked whether the changes should be
saved. When force is true, such a tool should terminate even when
doing so would lose changes that the user has not been asked by the
tool about saving.
The operation2Quit argument is the request that should be terminated.
For a request to be terminable, the handler must have sent a Status
notice back to the requester (thus identifying itself to the
requester).
ERRORS
The ToolTalk service may return one of the following errors in process‐
ing the Quit request:
TT_DESKTOP_ECANCELED
The user overrode the Quit request.
TT_DESKTOP_ENOMSG
The operation2Quit argument does not refer to any message cur‐
rently known by the handler.
APPLICATION USAGE
The ttdt_session_join(3), and ttdt_message_accept(3), functions can be
used to register for, and help process, the Quit request.
In the successful case, ``zero or more'' procids are cited because a
single process can instantiate multiple independent procids, and a sin‐
gle procid can conceivably be implemented by a set of cooperating pro‐
cesses.
EXAMPLES
The Quit request can be sent as in the following example:
Tt_message msg = tttk_message_create(0, TT_REQUEST, TT_SESSION,
the_recipient_procid, TTDT_QUIT,
my_callback);
tt_message_iarg_add(msg, TT_IN, Tttk_boolean, 0);
tt_message_iarg_add(msg, TT_IN, Tttk_boolean, 0);
tt_message_send(msg);
WARNINGSQuit can also be sent as a multicast notice, as an edict to all tools
in the scope of the message. The consequences of doing so can be
severe and unexpected.
BUGS
The silent argument should have its polarity reversed, to be like the
inquisitive argument of several of the Media messages.
SEE ALSOtt_close(3), tt_message_iarg_add(3), tt_message_send(3), ttdt_mes‐
sage_accept(3), ttdt_session_join(3).
ToolTalk 1.3 1 March 1996 Quit(4)
