source3/lib/smbd_tevent_queue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async requests
   4    Copyright (C) Volker Lendecke 2008
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7      ** NOTE! The following LGPL license applies to the tevent
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 3 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 /* Back-port of missing API from 4.2.x for tevent_queues. */
  26
  27 #include "replace.h"
  28 #include <tevent.h>
  29 #include "source3/lib/smbd_tevent_queue.h"
  30
  31 struct tevent_queue_wait_state {
  32         uint8_t dummy;
  33 };
  34
  35 static void tevent_queue_wait_trigger(struct tevent_req *req,
  36                                       void *private_data);
  37
  38 struct tevent_req *smbd_tevent_queue_wait_send(TALLOC_CTX *mem_ctx,
  39                                           struct tevent_context *ev,
  40                                           struct tevent_queue *queue)
  41 {
  42         struct tevent_req *req;
  43         struct tevent_queue_wait_state *state;
  44         bool ok;
  45
  46         req = tevent_req_create(mem_ctx, &state,
  47                                 struct tevent_queue_wait_state);
  48         if (req == NULL) {
  49                 return NULL;
  50         }
  51
  52         ok = tevent_queue_add(queue, ev, req,
  53                               tevent_queue_wait_trigger,
  54                               NULL);
  55         if (!ok) {
  56                 tevent_req_oom(req);
  57                 return tevent_req_post(req, ev);
  58         }
  59
  60         return req;
  61 }
  62
  63 static void tevent_queue_wait_trigger(struct tevent_req *req,
  64                                          void *private_data)
  65 {
  66         tevent_req_done(req);
  67 }
  68
  69 bool smbd_tevent_queue_wait_recv(struct tevent_req *req)
  70 {
  71         enum tevent_req_state state;
  72         uint64_t err;
  73
  74         if (tevent_req_is_error(req, &state, &err)) {
  75                 tevent_req_received(req);
  76                 return false;
  77         }
  78
  79         tevent_req_received(req);
  80         return true;
  81 }