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 struct ParallelIOArg {
  45     void *buffer;
  46     int count;
  47 };
  48
  49 #define CHR_IOCTL_SERIAL_SET_TIOCM   13
  50 #define CHR_IOCTL_SERIAL_GET_TIOCM   14
  51
  52 #define CHR_TIOCM_CTS   0x020
  53 #define CHR_TIOCM_CAR   0x040
  54 #define CHR_TIOCM_DSR   0x100
  55 #define CHR_TIOCM_RI    0x080
  56 #define CHR_TIOCM_DTR   0x002
  57 #define CHR_TIOCM_RTS   0x004
  58
  59 typedef void IOEventHandler(void *opaque, int event);
  60
  61 struct CharDriverState {
  62     QemuMutex chr_write_lock;
  63     void (*init)(struct CharDriverState *s);
  64     int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
  65     int (*chr_sync_read)(struct CharDriverState *s,
  66                          const uint8_t *buf, int len);
  67     GSource *(*chr_add_watch)(struct CharDriverState *s, GIOCondition cond);
  68     void (*chr_update_read_handler)(struct CharDriverState *s);
  69     int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
  70     int (*get_msgfds)(struct CharDriverState *s, int* fds, int num);
  71     int (*set_msgfds)(struct CharDriverState *s, int *fds, int num);
  72     int (*chr_add_client)(struct CharDriverState *chr, int fd);
  73     IOEventHandler *chr_event;
  74     IOCanReadHandler *chr_can_read;
  75     IOReadHandler *chr_read;
  76     void *handler_opaque;
  77     void (*chr_close)(struct CharDriverState *chr);
  78     void (*chr_accept_input)(struct CharDriverState *chr);
  79     void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
  80     void (*chr_set_fe_open)(struct CharDriverState *chr, int fe_open);
  81     void (*chr_fe_event)(struct CharDriverState *chr, int event);
  82     void *opaque;
  83     char *label;
  84     char *filename;
  85     int logfd;
  86     int be_open;
  87     int fe_open;
  88     int explicit_fe_open;
  89     int explicit_be_open;
  90     int avail_connections;
  91     int is_mux;
  92     guint fd_in_tag;
  93     QemuOpts *opts;
  94     bool replay;
  95     QTAILQ_ENTRY(CharDriverState) next;
  96 };
  97
  98 /**
  99  * qemu_chr_alloc:
 100  * @backend: the common backend config
 101  * @errp: pointer to a NULL-initialized error object
 102  *
 103  * Allocate and initialize a new CharDriverState.
 104  *
 105  * Returns: a newly allocated CharDriverState, or NULL on error.
 106  */
 107 CharDriverState *qemu_chr_alloc(ChardevCommon *backend, Error **errp);
 108
 109 /**
 110  * @qemu_chr_new_from_opts:
 111  *
 112  * Create a new character backend from a QemuOpts list.
 113  *
 114  * @opts see qemu-config.c for a list of valid options
 115  * @init not sure..
 116  *
 117  * Returns: a new character backend
 118  */
 119 CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
 120                                     void (*init)(struct CharDriverState *s),
 121                                     Error **errp);
 122
 123 /**
 124  * @qemu_chr_parse_common:
 125  *
 126  * Parse the common options available to all character backends.
 127  *
 128  * @opts the options that still need parsing
 129  * @backend a new backend
 130  */
 131 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend);
 132
 133 /**
 134  * @qemu_chr_new:
 135  *
 136  * Create a new character backend from a URI.
 137  *
 138  * @label the name of the backend
 139  * @filename the URI
 140  * @init not sure..
 141  *
 142  * Returns: a new character backend
 143  */
 144 CharDriverState *qemu_chr_new(const char *label, const char *filename,
 145                               void (*init)(struct CharDriverState *s));
 146
 147 /**
 148  * @qemu_chr_new_noreplay:
 149  *
 150  * Create a new character backend from a URI.
 151  * Character device communications are not written
 152  * into the replay log.
 153  *
 154  * @label the name of the backend
 155  * @filename the URI
 156  * @init not sure..
 157  *
 158  * Returns: a new character backend
 159  */
 160 CharDriverState *qemu_chr_new_noreplay(const char *label, const char *filename,
 161                                        void (*init)(struct CharDriverState *s));
 162
 163 /**
 164  * @qemu_chr_delete:
 165  *
 166  * Destroy a character backend and remove it from the list of
 167  * identified character backends.
 168  */
 169 void qemu_chr_delete(CharDriverState *chr);
 170
 171 /**
 172  * @qemu_chr_free:
 173  *
 174  * Destroy a character backend.
 175  */
 176 void qemu_chr_free(CharDriverState *chr);
 177
 178 /**
 179  * @qemu_chr_fe_set_echo:
 180  *
 181  * Ask the backend to override its normal echo setting.  This only really
 182  * applies to the stdio backend and is used by the QMP server such that you
 183  * can see what you type if you try to type QMP commands.
 184  *
 185  * @echo true to enable echo, false to disable echo
 186  */
 187 void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);
 188
 189 /**
 190  * @qemu_chr_fe_set_open:
 191  *
 192  * Set character frontend open status.  This is an indication that the
 193  * front end is ready (or not) to begin doing I/O.
 194  */
 195 void qemu_chr_fe_set_open(struct CharDriverState *chr, int fe_open);
 196
 197 /**
 198  * @qemu_chr_fe_event:
 199  *
 200  * Send an event from the front end to the back end.
 201  *
 202  * @event the event to send
 203  */
 204 void qemu_chr_fe_event(CharDriverState *s, int event);
 205
 206 /**
 207  * @qemu_chr_fe_printf:
 208  *
 209  * Write to a character backend using a printf style interface.
 210  * This function is thread-safe.
 211  *
 212  * @fmt see #printf
 213  */
 214 void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
 215     GCC_FMT_ATTR(2, 3);
 216
 217 int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond,
 218                           GIOFunc func, void *user_data);
 219
 220 /**
 221  * @qemu_chr_fe_write:
 222  *
 223  * Write data to a character backend from the front end.  This function
 224  * will send data from the front end to the back end.  This function
 225  * is thread-safe.
 226  *
 227  * @buf the data
 228  * @len the number of bytes to send
 229  *
 230  * Returns: the number of bytes consumed
 231  */
 232 int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
 233
 234 /**
 235  * @qemu_chr_fe_write_all:
 236  *
 237  * Write data to a character backend from the front end.  This function will
 238  * send data from the front end to the back end.  Unlike @qemu_chr_fe_write,
 239  * this function will block if the back end cannot consume all of the data
 240  * attempted to be written.  This function is thread-safe.
 241  *
 242  * @buf the data
 243  * @len the number of bytes to send
 244  *
 245  * Returns: the number of bytes consumed
 246  */
 247 int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
 248
 249 /**
 250  * @qemu_chr_fe_read_all:
 251  *
 252  * Read data to a buffer from the back end.
 253  *
 254  * @buf the data buffer
 255  * @len the number of bytes to read
 256  *
 257  * Returns: the number of bytes read
 258  */
 259 int qemu_chr_fe_read_all(CharDriverState *s, uint8_t *buf, int len);
 260
 261 /**
 262  * @qemu_chr_fe_ioctl:
 263  *
 264  * Issue a device specific ioctl to a backend.  This function is thread-safe.
 265  *
 266  * @cmd see CHR_IOCTL_*
 267  * @arg the data associated with @cmd
 268  *
 269  * Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
 270  *          return value depends on the semantics of @cmd
 271  */
 272 int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
 273
 274 /**
 275  * @qemu_chr_fe_get_msgfd:
 276  *
 277  * For backends capable of fd passing, return the latest file descriptor passed
 278  * by a client.
 279  *
 280  * Returns: -1 if fd passing isn't supported or there is no pending file
 281  *          descriptor.  If a file descriptor is returned, subsequent calls to
 282  *          this function will return -1 until a client sends a new file
 283  *          descriptor.
 284  */
 285 int qemu_chr_fe_get_msgfd(CharDriverState *s);
 286
 287 /**
 288  * @qemu_chr_fe_get_msgfds:
 289  *
 290  * For backends capable of fd passing, return the number of file received
 291  * descriptors and fills the fds array up to num elements
 292  *
 293  * Returns: -1 if fd passing isn't supported or there are no pending file
 294  *          descriptors.  If file descriptors are returned, subsequent calls to
 295  *          this function will return -1 until a client sends a new set of file
 296  *          descriptors.
 297  */
 298 int qemu_chr_fe_get_msgfds(CharDriverState *s, int *fds, int num);
 299
 300 /**
 301  * @qemu_chr_fe_set_msgfds:
 302  *
 303  * For backends capable of fd passing, set an array of fds to be passed with
 304  * the next send operation.
 305  * A subsequent call to this function before calling a write function will
 306  * result in overwriting the fd array with the new value without being send.
 307  * Upon writing the message the fd array is freed.
 308  *
 309  * Returns: -1 if fd passing isn't supported.
 310  */
 311 int qemu_chr_fe_set_msgfds(CharDriverState *s, int *fds, int num);
 312
 313 /**
 314  * @qemu_chr_fe_claim:
 315  *
 316  * Claim a backend before using it, should be called before calling
 317  * qemu_chr_add_handlers().
 318  *
 319  * Returns: -1 if the backend is already in use by another frontend, 0 on
 320  *          success.
 321  */
 322 int qemu_chr_fe_claim(CharDriverState *s);
 323
 324 /**
 325  * @qemu_chr_fe_claim_no_fail:
 326  *
 327  * Like qemu_chr_fe_claim, but will exit qemu with an error when the
 328  * backend is already in use.
 329  */
 330 void qemu_chr_fe_claim_no_fail(CharDriverState *s);
 331
 332 /**
 333  * @qemu_chr_fe_claim:
 334  *
 335  * Release a backend for use by another frontend.
 336  *
 337  * Returns: -1 if the backend is already in use by another frontend, 0 on
 338  *          success.
 339  */
 340 void qemu_chr_fe_release(CharDriverState *s);
 341
 342 /**
 343  * @qemu_chr_be_can_write:
 344  *
 345  * Determine how much data the front end can currently accept.  This function
 346  * returns the number of bytes the front end can accept.  If it returns 0, the
 347  * front end cannot receive data at the moment.  The function must be polled
 348  * to determine when data can be received.
 349  *
 350  * Returns: the number of bytes the front end can receive via @qemu_chr_be_write
 351  */
 352 int qemu_chr_be_can_write(CharDriverState *s);
 353
 354 /**
 355  * @qemu_chr_be_write:
 356  *
 357  * Write data from the back end to the front end.  Before issuing this call,
 358  * the caller should call @qemu_chr_be_can_write to determine how much data
 359  * the front end can currently accept.
 360  *
 361  * @buf a buffer to receive data from the front end
 362  * @len the number of bytes to receive from the front end
 363  */
 364 void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
 365
 366 /**
 367  * @qemu_chr_be_write_impl:
 368  *
 369  * Implementation of back end writing. Used by replay module.
 370  *
 371  * @buf a buffer to receive data from the front end
 372  * @len the number of bytes to receive from the front end
 373  */
 374 void qemu_chr_be_write_impl(CharDriverState *s, uint8_t *buf, int len);
 375
 376 /**
 377  * @qemu_chr_be_event:
 378  *
 379  * Send an event from the back end to the front end.
 380  *
 381  * @event the event to send
 382  */
 383 void qemu_chr_be_event(CharDriverState *s, int event);
 384
 385 void qemu_chr_add_handlers(CharDriverState *s,
 386                            IOCanReadHandler *fd_can_read,
 387                            IOReadHandler *fd_read,
 388                            IOEventHandler *fd_event,
 389                            void *opaque);
 390
 391 void qemu_chr_be_generic_open(CharDriverState *s);
 392 void qemu_chr_accept_input(CharDriverState *s);
 393 int qemu_chr_add_client(CharDriverState *s, int fd);
 394 CharDriverState *qemu_chr_find(const char *name);
 395 bool chr_is_ringbuf(const CharDriverState *chr);
 396
 397 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
 398
 399 void register_char_driver(const char *name, ChardevBackendKind kind,
 400         void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp),
 401         CharDriverState *(*create)(const char *id, ChardevBackend *backend,
 402                                    ChardevReturn *ret, Error **errp));
 403
 404 extern int term_escape_char;
 405
 406
 407 /* console.c */
 408 typedef CharDriverState *(VcHandler)(ChardevVC *vc, Error **errp);
 409 void register_vc_handler(VcHandler *handler);
 410
 411 #endif