include/sysemu/char.h

   1 #ifndef QEMU_CHAR_H
   2 #define QEMU_CHAR_H
   3
   4 #include "qemu-common.h"
   5 #include "qemu/queue.h"
   6 #include "qemu/option.h"
   7 #include "qemu/config-file.h"
   8 #include "block/aio.h"
   9 #include "qapi/qmp/qobject.h"
  10 #include "qapi/qmp/qstring.h"
  11 #include "qemu/main-loop.h"
  12
  13 /* character device */
  14
  15 #define CHR_EVENT_BREAK   0 /* serial break char */
  16 #define CHR_EVENT_FOCUS   1 /* focus to this terminal (modal input needed) */
  17 #define CHR_EVENT_OPENED  2 /* new connection established */
  18 #define CHR_EVENT_MUX_IN  3 /* mux-focus was set to this terminal */
  19 #define CHR_EVENT_MUX_OUT 4 /* mux-focus will move on */
  20 #define CHR_EVENT_CLOSED  5 /* connection closed */
  21
  22
  23 #define CHR_IOCTL_SERIAL_SET_PARAMS   1
  24 typedef struct {
  25     int speed;
  26     int parity;
  27     int data_bits;
  28     int stop_bits;
  29 } QEMUSerialSetParams;
  30
  31 #define CHR_IOCTL_SERIAL_SET_BREAK    2
  32
  33 #define CHR_IOCTL_PP_READ_DATA        3
  34 #define CHR_IOCTL_PP_WRITE_DATA       4
  35 #define CHR_IOCTL_PP_READ_CONTROL     5
  36 #define CHR_IOCTL_PP_WRITE_CONTROL    6
  37 #define CHR_IOCTL_PP_READ_STATUS      7
  38 #define CHR_IOCTL_PP_EPP_READ_ADDR    8
  39 #define CHR_IOCTL_PP_EPP_READ         9
  40 #define CHR_IOCTL_PP_EPP_WRITE_ADDR  10
  41 #define CHR_IOCTL_PP_EPP_WRITE       11
  42 #define CHR_IOCTL_PP_DATA_DIR        12
  43
  44 #define CHR_IOCTL_SERIAL_SET_TIOCM   13
  45 #define CHR_IOCTL_SERIAL_GET_TIOCM   14
  46
  47 #define CHR_TIOCM_CTS   0x020
  48 #define CHR_TIOCM_CAR   0x040
  49 #define CHR_TIOCM_DSR   0x100
  50 #define CHR_TIOCM_RI    0x080
  51 #define CHR_TIOCM_DTR   0x002
  52 #define CHR_TIOCM_RTS   0x004
  53
  54 typedef void IOEventHandler(void *opaque, int event);
  55
  56 struct CharDriverState {
  57     void (*init)(struct CharDriverState *s);
  58     int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
  59     GSource *(*chr_add_watch)(struct CharDriverState *s, GIOCondition cond);
  60     void (*chr_update_read_handler)(struct CharDriverState *s);
  61     int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
  62     int (*get_msgfd)(struct CharDriverState *s);
  63     int (*chr_add_client)(struct CharDriverState *chr, int fd);
  64     IOEventHandler *chr_event;
  65     IOCanReadHandler *chr_can_read;
  66     IOReadHandler *chr_read;
  67     void *handler_opaque;
  68     void (*chr_close)(struct CharDriverState *chr);
  69     void (*chr_accept_input)(struct CharDriverState *chr);
  70     void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
  71     void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
  72     void *opaque;
  73     int idle_tag;
  74     char *label;
  75     char *filename;
  76     int be_open;
  77     int fe_open;
  78     int explicit_fe_open;
  79     int avail_connections;
  80     QemuOpts *opts;
  81     QTAILQ_ENTRY(CharDriverState) next;
  82 };
  83
  84 /**
  85  * @qemu_chr_new_from_opts:
  86  *
  87  * Create a new character backend from a QemuOpts list.
  88  *
  89  * @opts see qemu-config.c for a list of valid options
  90  * @init not sure..
  91  *
  92  * Returns: a new character backend
  93  */
  94 CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
  95                                     void (*init)(struct CharDriverState *s),
  96                                     Error **errp);
  97
  98 /**
  99  * @qemu_chr_new:
 100  *
 101  * Create a new character backend from a URI.
 102  *
 103  * @label the name of the backend
 104  * @filename the URI
 105  * @init not sure..
 106  *
 107  * Returns: a new character backend
 108  */
 109 CharDriverState *qemu_chr_new(const char *label, const char *filename,
 110                               void (*init)(struct CharDriverState *s));
 111
 112 /**
 113  * @qemu_chr_delete:
 114  *
 115  * Destroy a character backend.
 116  */
 117 void qemu_chr_delete(CharDriverState *chr);
 118
 119 /**
 120  * @qemu_chr_fe_set_echo:
 121  *
 122  * Ask the backend to override its normal echo setting.  This only really
 123  * applies to the stdio backend and is used by the QMP server such that you
 124  * can see what you type if you try to type QMP commands.
 125  *
 126  * @echo true to enable echo, false to disable echo
 127  */
 128 void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);
 129
 130 /**
 131  * @qemu_chr_fe_set_open:
 132  *
 133  * Set character frontend open status.  This is an indication that the
 134  * front end is ready (or not) to begin doing I/O.
 135  */
 136 void qemu_chr_fe_set_open(struct CharDriverState *chr, int fe_open);
 137
 138 /**
 139  * @qemu_chr_fe_printf:
 140  *
 141  * Write to a character backend using a printf style interface.
 142  *
 143  * @fmt see #printf
 144  */
 145 void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
 146     GCC_FMT_ATTR(2, 3);
 147
 148 int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond,
 149                           GIOFunc func, void *user_data);
 150
 151 /**
 152  * @qemu_chr_fe_write:
 153  *
 154  * Write data to a character backend from the front end.  This function will
 155  * send data from the front end to the back end.
 156  *
 157  * @buf the data
 158  * @len the number of bytes to send
 159  *
 160  * Returns: the number of bytes consumed
 161  */
 162 int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
 163
 164 /**
 165  * @qemu_chr_fe_write_all:
 166  *
 167  * Write data to a character backend from the front end.  This function will
 168  * send data from the front end to the back end.  Unlike @qemu_chr_fe_write,
 169  * this function will block if the back end cannot consume all of the data
 170  * attempted to be written.
 171  *
 172  * @buf the data
 173  * @len the number of bytes to send
 174  *
 175  * Returns: the number of bytes consumed
 176  */
 177 int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
 178
 179 /**
 180  * @qemu_chr_fe_ioctl:
 181  *
 182  * Issue a device specific ioctl to a backend.
 183  *
 184  * @cmd see CHR_IOCTL_*
 185  * @arg the data associated with @cmd
 186  *
 187  * Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
 188  *          return value depends on the semantics of @cmd
 189  */
 190 int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
 191
 192 /**
 193  * @qemu_chr_fe_get_msgfd:
 194  *
 195  * For backends capable of fd passing, return the latest file descriptor passed
 196  * by a client.
 197  *
 198  * Returns: -1 if fd passing isn't supported or there is no pending file
 199  *          descriptor.  If a file descriptor is returned, subsequent calls to
 200  *          this function will return -1 until a client sends a new file
 201  *          descriptor.
 202  */
 203 int qemu_chr_fe_get_msgfd(CharDriverState *s);
 204
 205 /**
 206  * @qemu_chr_fe_claim:
 207  *
 208  * Claim a backend before using it, should be called before calling
 209  * qemu_chr_add_handlers().
 210  *
 211  * Returns: -1 if the backend is already in use by another frontend, 0 on
 212  *          success.
 213  */
 214 int qemu_chr_fe_claim(CharDriverState *s);
 215
 216 /**
 217  * @qemu_chr_fe_claim_no_fail:
 218  *
 219  * Like qemu_chr_fe_claim, but will exit qemu with an error when the
 220  * backend is already in use.
 221  */
 222 void qemu_chr_fe_claim_no_fail(CharDriverState *s);
 223
 224 /**
 225  * @qemu_chr_fe_claim:
 226  *
 227  * Release a backend for use by another frontend.
 228  *
 229  * Returns: -1 if the backend is already in use by another frontend, 0 on
 230  *          success.
 231  */
 232 void qemu_chr_fe_release(CharDriverState *s);
 233
 234 /**
 235  * @qemu_chr_be_can_write:
 236  *
 237  * Determine how much data the front end can currently accept.  This function
 238  * returns the number of bytes the front end can accept.  If it returns 0, the
 239  * front end cannot receive data at the moment.  The function must be polled
 240  * to determine when data can be received.
 241  *
 242  * Returns: the number of bytes the front end can receive via @qemu_chr_be_write
 243  */
 244 int qemu_chr_be_can_write(CharDriverState *s);
 245
 246 /**
 247  * @qemu_chr_be_write:
 248  *
 249  * Write data from the back end to the front end.  Before issuing this call,
 250  * the caller should call @qemu_chr_be_can_write to determine how much data
 251  * the front end can currently accept.
 252  *
 253  * @buf a buffer to receive data from the front end
 254  * @len the number of bytes to receive from the front end
 255  */
 256 void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
 257
 258
 259 /**
 260  * @qemu_chr_be_event:
 261  *
 262  * Send an event from the back end to the front end.
 263  *
 264  * @event the event to send
 265  */
 266 void qemu_chr_be_event(CharDriverState *s, int event);
 267
 268 void qemu_chr_add_handlers(CharDriverState *s,
 269                            IOCanReadHandler *fd_can_read,
 270                            IOReadHandler *fd_read,
 271                            IOEventHandler *fd_event,
 272                            void *opaque);
 273
 274 void qemu_chr_be_generic_open(CharDriverState *s);
 275 void qemu_chr_accept_input(CharDriverState *s);
 276 int qemu_chr_add_client(CharDriverState *s, int fd);
 277 void qemu_chr_info_print(Monitor *mon, const QObject *ret_data);
 278 void qemu_chr_info(Monitor *mon, QObject **ret_data);
 279 CharDriverState *qemu_chr_find(const char *name);
 280
 281 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
 282
 283 void register_char_driver(const char *name, CharDriverState *(*open)(QemuOpts *));
 284 void register_char_driver_qapi(const char *name, int kind,
 285         void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp));
 286
 287 /* add an eventfd to the qemu devices that are polled */
 288 CharDriverState *qemu_chr_open_eventfd(int eventfd);
 289
 290 extern int term_escape_char;
 291
 292 CharDriverState *qemu_char_get_next_serial(void);
 293
 294 /* msmouse */
 295 CharDriverState *qemu_chr_open_msmouse(void);
 296
 297 /* baum.c */
 298 CharDriverState *chr_baum_init(void);
 299
 300 #endif