chardev/char-null.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "chardev/char.h"
  27 #include "qemu/module.h"
  28
  29 static void null_chr_open(Chardev *chr,
  30                           ChardevBackend *backend,
  31                           bool *be_opened,
  32                           Error **errp)
  33 {
  34     *be_opened = false;
  35 }
  36
  37 static void char_null_class_init(ObjectClass *oc, void *data)
  38 {
  39     ChardevClass *cc = CHARDEV_CLASS(oc);
  40
  41     cc->open = null_chr_open;
  42 }
  43
  44 static const TypeInfo char_null_type_info = {
  45     .name = TYPE_CHARDEV_NULL,
  46     .parent = TYPE_CHARDEV,
  47     .instance_size = sizeof(Chardev),
  48     .class_init = char_null_class_init,
  49 };
  50
  51 static void register_types(void)
  52 {
  53     type_register_static(&char_null_type_info);
  54 }
  55
  56 type_init(register_types);