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/* ccapi/server/ccs_callback.c */
/*
* Copyright 2006 Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "ccs_common.h"
struct ccs_callback_d {
cc_int32 pending;
cc_int32 invalid_object_err;
ccs_pipe_t client_pipe;
ccs_pipe_t reply_pipe;
ccs_callback_owner_t owner; /* pointer to owner */
ccs_callback_owner_invalidate_t owner_invalidate;
};
struct ccs_callback_d ccs_callback_initializer = { 1, 1, CCS_PIPE_NULL, CCS_PIPE_NULL, NULL, NULL };
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_new (ccs_callback_t *out_callback,
cc_int32 in_invalid_object_err,
ccs_pipe_t in_client_pipe,
ccs_pipe_t in_reply_pipe,
ccs_callback_owner_t in_owner,
ccs_callback_owner_invalidate_t in_owner_invalidate_function)
{
cc_int32 err = ccNoError;
ccs_callback_t callback = NULL;
ccs_client_t client = NULL;
if (!out_callback ) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_reply_pipe) ) { err = cci_check_error (ccErrBadParam); }
if (!in_owner ) { err = cci_check_error (ccErrBadParam); }
if (!in_owner_invalidate_function ) { err = cci_check_error (ccErrBadParam); }
if (!err) {
callback = malloc (sizeof (*callback));
if (callback) {
*callback = ccs_callback_initializer;
} else {
err = cci_check_error (ccErrNoMem);
}
}
if (!err) {
err = ccs_server_client_for_pipe (in_client_pipe, &client);
}
if (!err) {
err = ccs_pipe_copy (&callback->client_pipe, in_client_pipe);
}
if (!err) {
err = ccs_pipe_copy (&callback->reply_pipe, in_reply_pipe);
}
if (!err) {
callback->client_pipe = in_client_pipe;
callback->reply_pipe = in_reply_pipe;
callback->invalid_object_err = in_invalid_object_err;
callback->owner = in_owner;
callback->owner_invalidate = in_owner_invalidate_function;
err = ccs_client_add_callback (client, callback);
}
if (!err) {
*out_callback = callback;
callback = NULL;
}
ccs_callback_release (callback);
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_release (ccs_callback_t io_callback)
{
cc_int32 err = ccNoError;
if (!err && io_callback) {
ccs_client_t client = NULL;
if (io_callback->pending) {
err = ccs_server_send_reply (io_callback->reply_pipe,
io_callback->invalid_object_err, NULL);
io_callback->pending = 0;
}
if (!err) {
err = ccs_server_client_for_pipe (io_callback->client_pipe, &client);
}
if (!err && client) {
/* if client object still has a reference to us, remove it */
err = ccs_client_remove_callback (client, io_callback);
}
if (!err) {
ccs_pipe_release (io_callback->client_pipe);
ccs_pipe_release (io_callback->reply_pipe);
free (io_callback);
}
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_invalidate (ccs_callback_t io_callback)
{
cc_int32 err = ccNoError;
if (!io_callback) { err = cci_check_error (ccErrBadParam); }
if (!err) {
io_callback->pending = 0; /* client is dead, don't try to talk to it */
if (io_callback->owner_invalidate) {
err = io_callback->owner_invalidate (io_callback->owner, io_callback);
} else {
cci_debug_printf ("WARNING %s() unable to notify callback owner!",
__FUNCTION__);
}
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_reply_to_client (ccs_callback_t io_callback,
k5_ipc_stream in_stream)
{
cc_int32 err = ccNoError;
if (!io_callback) { err = cci_check_error (ccErrBadParam); }
if (!err) {
if (io_callback->pending) {
cci_debug_printf ("%s: callback %p replying to client.", __FUNCTION__, io_callback);
err = ccs_server_send_reply (io_callback->reply_pipe, err, in_stream);
if (err) {
cci_debug_printf ("WARNING %s() called on a lock belonging to a dead client!",
__FUNCTION__);
}
io_callback->pending = 0;
} else {
cci_debug_printf ("WARNING %s() called on non-pending callback!",
__FUNCTION__);
}
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_uint32 ccs_callback_is_pending (ccs_callback_t in_callback,
cc_uint32 *out_pending)
{
cc_int32 err = ccNoError;
if (!in_callback) { err = cci_check_error (ccErrBadParam); }
if (!out_pending) { err = cci_check_error (ccErrBadParam); }
if (!err) {
*out_pending = in_callback->pending;
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_is_for_client_pipe (ccs_callback_t in_callback,
ccs_pipe_t in_client_pipe,
cc_uint32 *out_is_for_client_pipe)
{
cc_int32 err = ccNoError;
if (!in_callback ) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
if (!out_is_for_client_pipe ) { err = cci_check_error (ccErrBadParam); }
if (!err) {
err = ccs_pipe_compare (in_callback->client_pipe, in_client_pipe,
out_is_for_client_pipe);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_callback_client_pipe (ccs_callback_t in_callback,
ccs_pipe_t *out_client_pipe)
{
cc_int32 err = ccNoError;
if (!in_callback ) { err = cci_check_error (ccErrBadParam); }
if (!out_client_pipe) { err = cci_check_error (ccErrBadParam); }
if (!err) {
*out_client_pipe = in_callback->client_pipe;
}
return cci_check_error (err);
}
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