33577b47c6
This patch implements record and replay of character devices. It records chardevs communication in replay mode. Recorded information include data read from backend and counter of bytes written from frontend to backend to preserve frontend internal state. If character device was configured through the command line in record mode, then in replay mode it should be also added to command line. Backend of the character device could be changed in replay mode. Replaying of devices that perform ioctl and get_msgfd operations is not supported. gdbstub which also acts as a backend is not recorded to allow controlling the replaying through gdb. Monitor backends are also not recorded. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20160314074436.4980.83856.stgit@PASHA-ISP> [Add stubs. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
408 lines
12 KiB
C
408 lines
12 KiB
C
#ifndef QEMU_CHAR_H
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#define QEMU_CHAR_H
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#include "qemu-common.h"
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#include "qemu/queue.h"
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include "block/aio.h"
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#include "qapi/qmp/qobject.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/main-loop.h"
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/* character device */
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#define CHR_EVENT_BREAK 0 /* serial break char */
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#define CHR_EVENT_FOCUS 1 /* focus to this terminal (modal input needed) */
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#define CHR_EVENT_OPENED 2 /* new connection established */
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#define CHR_EVENT_MUX_IN 3 /* mux-focus was set to this terminal */
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#define CHR_EVENT_MUX_OUT 4 /* mux-focus will move on */
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#define CHR_EVENT_CLOSED 5 /* connection closed */
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#define CHR_IOCTL_SERIAL_SET_PARAMS 1
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typedef struct {
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int speed;
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int parity;
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int data_bits;
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int stop_bits;
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} QEMUSerialSetParams;
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#define CHR_IOCTL_SERIAL_SET_BREAK 2
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#define CHR_IOCTL_PP_READ_DATA 3
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#define CHR_IOCTL_PP_WRITE_DATA 4
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#define CHR_IOCTL_PP_READ_CONTROL 5
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#define CHR_IOCTL_PP_WRITE_CONTROL 6
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#define CHR_IOCTL_PP_READ_STATUS 7
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#define CHR_IOCTL_PP_EPP_READ_ADDR 8
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#define CHR_IOCTL_PP_EPP_READ 9
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#define CHR_IOCTL_PP_EPP_WRITE_ADDR 10
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#define CHR_IOCTL_PP_EPP_WRITE 11
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#define CHR_IOCTL_PP_DATA_DIR 12
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#define CHR_IOCTL_SERIAL_SET_TIOCM 13
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#define CHR_IOCTL_SERIAL_GET_TIOCM 14
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#define CHR_TIOCM_CTS 0x020
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#define CHR_TIOCM_CAR 0x040
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#define CHR_TIOCM_DSR 0x100
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#define CHR_TIOCM_RI 0x080
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#define CHR_TIOCM_DTR 0x002
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#define CHR_TIOCM_RTS 0x004
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typedef void IOEventHandler(void *opaque, int event);
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struct CharDriverState {
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QemuMutex chr_write_lock;
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void (*init)(struct CharDriverState *s);
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int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
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int (*chr_sync_read)(struct CharDriverState *s,
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const uint8_t *buf, int len);
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GSource *(*chr_add_watch)(struct CharDriverState *s, GIOCondition cond);
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void (*chr_update_read_handler)(struct CharDriverState *s);
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int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
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int (*get_msgfds)(struct CharDriverState *s, int* fds, int num);
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int (*set_msgfds)(struct CharDriverState *s, int *fds, int num);
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int (*chr_add_client)(struct CharDriverState *chr, int fd);
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IOEventHandler *chr_event;
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IOCanReadHandler *chr_can_read;
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IOReadHandler *chr_read;
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void *handler_opaque;
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void (*chr_close)(struct CharDriverState *chr);
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void (*chr_accept_input)(struct CharDriverState *chr);
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void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
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void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
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void (*chr_fe_event)(struct CharDriverState *chr, int event);
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void *opaque;
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char *label;
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char *filename;
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int logfd;
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int be_open;
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int fe_open;
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int explicit_fe_open;
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int explicit_be_open;
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int avail_connections;
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int is_mux;
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guint fd_in_tag;
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QemuOpts *opts;
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bool replay;
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QTAILQ_ENTRY(CharDriverState) next;
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};
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/**
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* qemu_chr_alloc:
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* @backend: the common backend config
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* @errp: pointer to a NULL-initialized error object
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*
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* Allocate and initialize a new CharDriverState.
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*
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* Returns: a newly allocated CharDriverState, or NULL on error.
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*/
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CharDriverState *qemu_chr_alloc(ChardevCommon *backend, Error **errp);
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/**
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* @qemu_chr_new_from_opts:
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*
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* Create a new character backend from a QemuOpts list.
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*
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* @opts see qemu-config.c for a list of valid options
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* @init not sure..
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*
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* Returns: a new character backend
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*/
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CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
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void (*init)(struct CharDriverState *s),
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Error **errp);
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/**
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* @qemu_chr_parse_common:
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*
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* Parse the common options available to all character backends.
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*
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* @opts the options that still need parsing
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* @backend a new backend
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*/
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void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend);
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/**
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* @qemu_chr_new:
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*
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* Create a new character backend from a URI.
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*
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* @label the name of the backend
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* @filename the URI
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* @init not sure..
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*
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* Returns: a new character backend
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*/
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CharDriverState *qemu_chr_new(const char *label, const char *filename,
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void (*init)(struct CharDriverState *s));
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/**
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* @qemu_chr_new_noreplay:
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*
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* Create a new character backend from a URI.
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* Character device communications are not written
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* into the replay log.
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*
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* @label the name of the backend
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* @filename the URI
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* @init not sure..
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*
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* Returns: a new character backend
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*/
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CharDriverState *qemu_chr_new_noreplay(const char *label, const char *filename,
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void (*init)(struct CharDriverState *s));
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/**
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* @qemu_chr_delete:
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*
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* Destroy a character backend and remove it from the list of
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* identified character backends.
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*/
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void qemu_chr_delete(CharDriverState *chr);
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/**
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* @qemu_chr_free:
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*
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* Destroy a character backend.
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*/
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void qemu_chr_free(CharDriverState *chr);
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/**
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* @qemu_chr_fe_set_echo:
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*
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* Ask the backend to override its normal echo setting. This only really
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* applies to the stdio backend and is used by the QMP server such that you
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* can see what you type if you try to type QMP commands.
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*
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* @echo true to enable echo, false to disable echo
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*/
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void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);
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/**
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* @qemu_chr_fe_set_open:
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*
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* Set character frontend open status. This is an indication that the
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* front end is ready (or not) to begin doing I/O.
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*/
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void qemu_chr_fe_set_open(struct CharDriverState *chr, int fe_open);
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/**
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* @qemu_chr_fe_event:
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*
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* Send an event from the front end to the back end.
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*
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* @event the event to send
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*/
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void qemu_chr_fe_event(CharDriverState *s, int event);
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/**
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* @qemu_chr_fe_printf:
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*
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* Write to a character backend using a printf style interface.
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* This function is thread-safe.
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*
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* @fmt see #printf
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*/
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void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
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GCC_FMT_ATTR(2, 3);
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int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond,
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GIOFunc func, void *user_data);
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/**
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* @qemu_chr_fe_write:
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*
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* Write data to a character backend from the front end. This function
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* will send data from the front end to the back end. This function
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* is thread-safe.
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*
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* @buf the data
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* @len the number of bytes to send
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*
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* Returns: the number of bytes consumed
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*/
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int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
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/**
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* @qemu_chr_fe_write_all:
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*
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* Write data to a character backend from the front end. This function will
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* send data from the front end to the back end. Unlike @qemu_chr_fe_write,
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* this function will block if the back end cannot consume all of the data
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* attempted to be written. This function is thread-safe.
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*
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* @buf the data
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* @len the number of bytes to send
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*
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* Returns: the number of bytes consumed
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*/
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int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
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/**
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* @qemu_chr_fe_read_all:
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*
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* Read data to a buffer from the back end.
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*
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* @buf the data buffer
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* @len the number of bytes to read
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*
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* Returns: the number of bytes read
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*/
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int qemu_chr_fe_read_all(CharDriverState *s, uint8_t *buf, int len);
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/**
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* @qemu_chr_fe_ioctl:
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*
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* Issue a device specific ioctl to a backend. This function is thread-safe.
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*
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* @cmd see CHR_IOCTL_*
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* @arg the data associated with @cmd
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*
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* Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
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* return value depends on the semantics of @cmd
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*/
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int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
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/**
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* @qemu_chr_fe_get_msgfd:
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*
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* For backends capable of fd passing, return the latest file descriptor passed
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* by a client.
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*
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* Returns: -1 if fd passing isn't supported or there is no pending file
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* descriptor. If a file descriptor is returned, subsequent calls to
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* this function will return -1 until a client sends a new file
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* descriptor.
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*/
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int qemu_chr_fe_get_msgfd(CharDriverState *s);
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/**
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* @qemu_chr_fe_get_msgfds:
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*
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* For backends capable of fd passing, return the number of file received
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* descriptors and fills the fds array up to num elements
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*
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* Returns: -1 if fd passing isn't supported or there are no pending file
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* descriptors. If file descriptors are returned, subsequent calls to
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* this function will return -1 until a client sends a new set of file
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* descriptors.
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*/
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int qemu_chr_fe_get_msgfds(CharDriverState *s, int *fds, int num);
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/**
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* @qemu_chr_fe_set_msgfds:
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*
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* For backends capable of fd passing, set an array of fds to be passed with
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* the next send operation.
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* A subsequent call to this function before calling a write function will
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* result in overwriting the fd array with the new value without being send.
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* Upon writing the message the fd array is freed.
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*
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* Returns: -1 if fd passing isn't supported.
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*/
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int qemu_chr_fe_set_msgfds(CharDriverState *s, int *fds, int num);
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/**
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* @qemu_chr_fe_claim:
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*
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* Claim a backend before using it, should be called before calling
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* qemu_chr_add_handlers().
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*
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* Returns: -1 if the backend is already in use by another frontend, 0 on
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* success.
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*/
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int qemu_chr_fe_claim(CharDriverState *s);
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/**
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* @qemu_chr_fe_claim_no_fail:
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*
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* Like qemu_chr_fe_claim, but will exit qemu with an error when the
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* backend is already in use.
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*/
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void qemu_chr_fe_claim_no_fail(CharDriverState *s);
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/**
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* @qemu_chr_fe_claim:
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*
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* Release a backend for use by another frontend.
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*
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* Returns: -1 if the backend is already in use by another frontend, 0 on
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* success.
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*/
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void qemu_chr_fe_release(CharDriverState *s);
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/**
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* @qemu_chr_be_can_write:
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*
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* Determine how much data the front end can currently accept. This function
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* returns the number of bytes the front end can accept. If it returns 0, the
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* front end cannot receive data at the moment. The function must be polled
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* to determine when data can be received.
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*
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* Returns: the number of bytes the front end can receive via @qemu_chr_be_write
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*/
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int qemu_chr_be_can_write(CharDriverState *s);
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/**
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* @qemu_chr_be_write:
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*
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* Write data from the back end to the front end. Before issuing this call,
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* the caller should call @qemu_chr_be_can_write to determine how much data
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* the front end can currently accept.
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*
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* @buf a buffer to receive data from the front end
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* @len the number of bytes to receive from the front end
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*/
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void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
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/**
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* @qemu_chr_be_write_impl:
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*
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* Implementation of back end writing. Used by replay module.
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*
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* @buf a buffer to receive data from the front end
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* @len the number of bytes to receive from the front end
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*/
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void qemu_chr_be_write_impl(CharDriverState *s, uint8_t *buf, int len);
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/**
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* @qemu_chr_be_event:
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*
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* Send an event from the back end to the front end.
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*
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* @event the event to send
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*/
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void qemu_chr_be_event(CharDriverState *s, int event);
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void qemu_chr_add_handlers(CharDriverState *s,
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IOCanReadHandler *fd_can_read,
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IOReadHandler *fd_read,
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IOEventHandler *fd_event,
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void *opaque);
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void qemu_chr_be_generic_open(CharDriverState *s);
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void qemu_chr_accept_input(CharDriverState *s);
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int qemu_chr_add_client(CharDriverState *s, int fd);
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CharDriverState *qemu_chr_find(const char *name);
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bool chr_is_ringbuf(const CharDriverState *chr);
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QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
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void register_char_driver(const char *name, ChardevBackendKind kind,
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void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp),
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CharDriverState *(*create)(const char *id, ChardevBackend *backend,
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ChardevReturn *ret, Error **errp));
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extern int term_escape_char;
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CharDriverState *qemu_char_get_next_serial(void);
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/* console.c */
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typedef CharDriverState *(VcHandler)(ChardevVC *vc, Error **errp);
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void register_vc_handler(VcHandler *handler);
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#endif
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