005b6d511f
Frontends can be attached and detached during run-time (although detach is not implemented, but will follow). Counter variable of muxes is not enough for proper attach/detach management, so this patch implements bitset: if bit is set for the `mux_bitset` variable, then frontend device can be found in the `backend` array (yes, huge confusion with backend and frontends names). Signed-off-by: Roman Penyaev <r.peniaev@gmail.com> Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> Cc: qemu-devel@nongnu.org Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-ID: <20241014152408.427700-7-r.peniaev@gmail.com>
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*
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* QEMU Character device internals
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef CHARDEV_INTERNAL_H
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#define CHARDEV_INTERNAL_H
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#include "chardev/char.h"
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#include "chardev/char-fe.h"
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#include "qom/object.h"
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#define MAX_MUX 4
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#define MUX_BUFFER_SIZE 32 /* Must be a power of 2. */
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#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
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struct MuxChardev {
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Chardev parent;
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CharBackend *backends[MAX_MUX];
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CharBackend chr;
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unsigned long mux_bitset;
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int focus;
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bool term_got_escape;
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/* Intermediate input buffer catches escape sequences even if the
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currently active device is not accepting any input - but only until it
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is full as well. */
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unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
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unsigned int prod[MAX_MUX];
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unsigned int cons[MAX_MUX];
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int timestamps;
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/* Protected by the Chardev chr_write_lock. */
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bool linestart;
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int64_t timestamps_start;
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};
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typedef struct MuxChardev MuxChardev;
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DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV,
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TYPE_CHARDEV_MUX)
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#define CHARDEV_IS_MUX(chr) \
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object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
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bool mux_chr_attach_frontend(MuxChardev *d, CharBackend *b,
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unsigned int *tag, Error **errp);
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void mux_set_focus(Chardev *chr, unsigned int focus);
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void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
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Object *get_chardevs_root(void);
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#endif /* CHARDEV_INTERNAL_H */
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