494 lines
14 KiB
C
494 lines
14 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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#include "qemu/bitmap.h"
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/* character device */
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typedef enum {
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CHR_EVENT_BREAK, /* serial break char */
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CHR_EVENT_OPENED, /* new connection established */
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CHR_EVENT_MUX_IN, /* mux-focus was set to this terminal */
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CHR_EVENT_MUX_OUT, /* mux-focus will move on */
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CHR_EVENT_CLOSED /* connection closed */
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} QEMUChrEvent;
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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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struct ParallelIOArg {
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void *buffer;
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int count;
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};
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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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typedef enum {
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/* Whether the chardev peer is able to close and
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* reopen the data channel, thus requiring support
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* for qemu_chr_wait_connected() to wait for a
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* valid connection */
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QEMU_CHAR_FEATURE_RECONNECTABLE,
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/* Whether it is possible to send/recv file descriptors
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* over the data channel */
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QEMU_CHAR_FEATURE_FD_PASS,
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QEMU_CHAR_FEATURE_LAST,
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} CharDriverFeature;
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/* This is the backend as seen by frontend, the actual backend is
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* CharDriverState */
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typedef struct CharBackend {
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CharDriverState *chr;
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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 *opaque;
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int tag;
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int fe_open;
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} CharBackend;
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struct CharDriverState {
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QemuMutex chr_write_lock;
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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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GMainContext *context);
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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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int (*chr_wait_connected)(struct CharDriverState *chr, Error **errp);
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void (*chr_free)(struct CharDriverState *chr);
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void (*chr_disconnect)(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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CharBackend *be;
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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 is_mux;
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guint fd_in_tag;
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bool replay;
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DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST);
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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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*
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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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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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*
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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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/**
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* @qemu_chr_fe_disconnect:
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*
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* Close a fd accpeted by character backend.
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* Without associated CharDriver, do nothing.
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*/
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void qemu_chr_fe_disconnect(CharBackend *be);
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/**
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* @qemu_chr_cleanup:
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*
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* Delete all chardevs (when leaving qemu)
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*/
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void qemu_chr_cleanup(void);
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/**
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* @qemu_chr_fe_wait_connected:
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*
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* Wait for characted backend to be connected, return < 0 on error or
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* if no assicated CharDriver.
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*/
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int qemu_chr_fe_wait_connected(CharBackend *be, Error **errp);
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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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*
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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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/**
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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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* Without associated CharDriver, do nothing.
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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(CharBackend *be, 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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* Without associated CharDriver, do nothing.
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*/
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void qemu_chr_fe_set_open(CharBackend *be, int fe_open);
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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. This
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* function is thread-safe. It does nothing without associated
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* CharDriver.
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*
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* @fmt see #printf
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*/
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void qemu_chr_fe_printf(CharBackend *be, const char *fmt, ...)
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GCC_FMT_ATTR(2, 3);
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/**
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* @qemu_chr_fe_add_watch:
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*
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* If the backend is connected, create and add a #GSource that fires
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* when the given condition (typically G_IO_OUT|G_IO_HUP or G_IO_HUP)
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* is active; return the #GSource's tag. If it is disconnected,
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* or without associated CharDriver, return 0.
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*
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* @cond the condition to poll for
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* @func the function to call when the condition happens
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* @user_data the opaque pointer to pass to @func
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*/
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guint qemu_chr_fe_add_watch(CharBackend *be, 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 (0 if no assicated CharDriver)
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*/
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int qemu_chr_fe_write(CharBackend *be, 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 (0 if no assicated CharDriver)
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*/
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int qemu_chr_fe_write_all(CharBackend *be, 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 (0 if no assicated CharDriver)
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*/
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int qemu_chr_fe_read_all(CharBackend *be, 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 or there is no
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* associated CharDriver, -ENOTSUP, otherwise the return
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* value depends on the semantics of @cmd
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*/
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int qemu_chr_fe_ioctl(CharBackend *be, 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(CharBackend *be);
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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(CharBackend *be, 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 or no associated CharDriver.
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*/
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int qemu_chr_fe_set_msgfds(CharBackend *be, int *fds, int num);
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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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/**
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* @qemu_chr_fe_init:
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*
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* Initializes a front end for the given CharBackend and
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* CharDriver. Call qemu_chr_fe_deinit() to remove the association and
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* release the driver.
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*
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* Returns: false on error.
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*/
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bool qemu_chr_fe_init(CharBackend *b, CharDriverState *s, Error **errp);
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/**
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* @qemu_chr_fe_get_driver:
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*
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* Returns the driver associated with a CharBackend or NULL if no
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* associated CharDriver.
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*/
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CharDriverState *qemu_chr_fe_get_driver(CharBackend *be);
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/**
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* @qemu_chr_fe_deinit:
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*
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* Dissociate the CharBackend from the CharDriver.
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*
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* Safe to call without associated CharDriver.
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*/
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void qemu_chr_fe_deinit(CharBackend *b);
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/**
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* @qemu_chr_fe_set_handlers:
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* @b: a CharBackend
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* @fd_can_read: callback to get the amount of data the frontend may
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* receive
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* @fd_read: callback to receive data from char
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* @fd_event: event callback
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* @opaque: an opaque pointer for the callbacks
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* @context: a main loop context or NULL for the default
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* @set_open: whether to call qemu_chr_fe_set_open() implicitely when
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* any of the handler is non-NULL
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*
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* Set the front end char handlers. The front end takes the focus if
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* any of the handler is non-NULL.
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*
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* Without associated CharDriver, nothing is changed.
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*/
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void qemu_chr_fe_set_handlers(CharBackend *b,
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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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GMainContext *context,
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bool set_open);
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/**
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* @qemu_chr_fe_take_focus:
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*
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* Take the focus (if the front end is muxed).
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*
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* Without associated CharDriver, nothing is changed.
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*/
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void qemu_chr_fe_take_focus(CharBackend *b);
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void qemu_chr_be_generic_open(CharDriverState *s);
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void qemu_chr_fe_accept_input(CharBackend *be);
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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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bool qemu_chr_has_feature(CharDriverState *chr,
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CharDriverFeature feature);
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void qemu_chr_set_feature(CharDriverState *chr,
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CharDriverFeature feature);
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QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
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typedef void CharDriverParse(QemuOpts *opts, ChardevBackend *backend,
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Error **errp);
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typedef CharDriverState *CharDriverCreate(const char *id,
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ChardevBackend *backend,
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ChardevReturn *ret, bool *be_opened,
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Error **errp);
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void register_char_driver(const char *name, ChardevBackendKind kind,
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CharDriverParse *parse, CharDriverCreate *create);
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extern int term_escape_char;
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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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