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 #include "qemu/osdep.h"
  25 #include "sysemu/char.h"
  26
  27 static void null_chr_open(Chardev *chr,
  28                           ChardevBackend *backend,
  29                           bool *be_opened,
  30                           Error **errp)
  31 {
  32     *be_opened = false;
  33 }
  34
  35 static void char_null_class_init(ObjectClass *oc, void *data)
  36 {
  37     ChardevClass *cc = CHARDEV_CLASS(oc);
  38
  39     cc->open = null_chr_open;
  40 }
  41
  42 static const TypeInfo char_null_type_info = {
  43     .name = TYPE_CHARDEV_NULL,
  44     .parent = TYPE_CHARDEV,
  45     .instance_size = sizeof(Chardev),
  46     .class_init = char_null_class_init,
  47 };
  48
  49 static void register_types(void)
  50 {
  51     type_register_static(&char_null_type_info);
  52 }
  53
  54 type_init(register_types);