linux-user: Add support for a group of btrfs ioctls used for snapshots
[qemu.git] / chardev / chardev-internal.h
1 /*
2 * QEMU Character device internals
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 #ifndef CHARDEV_INTERNAL_H
25 #define CHARDEV_INTERNAL_H
26
27 #include "chardev/char.h"
28 #include "chardev/char-fe.h"
29 #include "qom/object.h"
30
31 #define MAX_MUX 4
32 #define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
33 #define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
34
35 typedef struct MuxChardev {
36 Chardev parent;
37 CharBackend *backends[MAX_MUX];
38 CharBackend chr;
39 int focus;
40 int mux_cnt;
41 int term_got_escape;
42 int max_size;
43 /* Intermediate input buffer catches escape sequences even if the
44 currently active device is not accepting any input - but only until it
45 is full as well. */
46 unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
47 int prod[MAX_MUX];
48 int cons[MAX_MUX];
49 int timestamps;
50
51 /* Protected by the Chardev chr_write_lock. */
52 int linestart;
53 int64_t timestamps_start;
54 } MuxChardev;
55
56 #define MUX_CHARDEV(obj) OBJECT_CHECK(MuxChardev, (obj), TYPE_CHARDEV_MUX)
57 #define CHARDEV_IS_MUX(chr) \
58 object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
59
60 void mux_set_focus(Chardev *chr, int focus);
61 void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
62
63 Object *get_chardevs_root(void);
64
65 #endif /* CHAR_MUX_H */