LXR qemu/include/chardev/char-mux.h

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