include/char/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_guest_open)(struct CharDriverState *chr);
  72     void (*chr_guest_close)(struct CharDriverState *chr);
  73     void *opaque;
  74     int idle_tag;
  75     char *label;
  76     char *filename;
  77     int be_open;
  78     int avail_connections;
  79     QemuOpts *opts;
  80     QTAILQ_ENTRY(CharDriverState) next;
  81 };
  82
  83 /**
  84  * @qemu_chr_new_from_opts:
  85  *
  86  * Create a new character backend from a QemuOpts list.
  87  *
  88  * @opts see qemu-config.c for a list of valid options
  89  * @init not sure..
  90  *
  91  * Returns: a new character backend
  92  */
  93 CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
  94                                     void (*init)(struct CharDriverState *s),
  95                                     Error **errp);
  96
  97 /**
  98  * @qemu_chr_new:
  99  *
 100  * Create a new character backend from a URI.
 101  *
 102  * @label the name of the backend
 103  * @filename the URI
 104  * @init not sure..
 105  *
 106  * Returns: a new character backend
 107  */
 108 CharDriverState *qemu_chr_new(const char *label, const char *filename,
 109                               void (*init)(struct CharDriverState *s));
 110
 111 /**
 112  * @qemu_chr_delete:
 113  *
 114  * Destroy a character backend.
 115  */
 116 void qemu_chr_delete(CharDriverState *chr);
 117
 118 /**
 119  * @qemu_chr_fe_set_echo:
 120  *
 121  * Ask the backend to override its normal echo setting.  This only really
 122  * applies to the stdio backend and is used by the QMP server such that you
 123  * can see what you type if you try to type QMP commands.
 124  *
 125  * @echo true to enable echo, false to disable echo
 126  */
 127 void qemu_chr_fe_set_echo(struct CharDriverState *chr, bool echo);
 128
 129 /**
 130  * @qemu_chr_fe_open:
 131  *
 132  * Open a character backend.  This function call is an indication that the
 133  * front end is ready to begin doing I/O.
 134  */
 135 void qemu_chr_fe_open(struct CharDriverState *chr);
 136
 137 /**
 138  * @qemu_chr_fe_close:
 139  *
 140  * Close a character backend.  This function call indicates that the front end
 141  * no longer is able to process I/O.  To process I/O again, the front end will
 142  * call @qemu_chr_fe_open.
 143  */
 144 void qemu_chr_fe_close(struct CharDriverState *chr);
 145
 146 /**
 147  * @qemu_chr_fe_printf:
 148  *
 149  * Write to a character backend using a printf style interface.
 150  *
 151  * @fmt see #printf
 152  */
 153 void qemu_chr_fe_printf(CharDriverState *s, const char *fmt, ...)
 154     GCC_FMT_ATTR(2, 3);
 155
 156 int qemu_chr_fe_add_watch(CharDriverState *s, GIOCondition cond,
 157                           GIOFunc func, void *user_data);
 158
 159 /**
 160  * @qemu_chr_fe_write:
 161  *
 162  * Write data to a character backend from the front end.  This function will
 163  * send data from the front end to the back end.
 164  *
 165  * @buf the data
 166  * @len the number of bytes to send
 167  *
 168  * Returns: the number of bytes consumed
 169  */
 170 int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
 171
 172 /**
 173  * @qemu_chr_fe_write_all:
 174  *
 175  * Write data to a character backend from the front end.  This function will
 176  * send data from the front end to the back end.  Unlike @qemu_chr_fe_write,
 177  * this function will block if the back end cannot consume all of the data
 178  * attempted to be written.
 179  *
 180  * @buf the data
 181  * @len the number of bytes to send
 182  *
 183  * Returns: the number of bytes consumed
 184  */
 185 int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
 186
 187 /**
 188  * @qemu_chr_fe_ioctl:
 189  *
 190  * Issue a device specific ioctl to a backend.
 191  *
 192  * @cmd see CHR_IOCTL_*
 193  * @arg the data associated with @cmd
 194  *
 195  * Returns: if @cmd is not supported by the backend, -ENOTSUP, otherwise the
 196  *          return value depends on the semantics of @cmd
 197  */
 198 int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg);
 199
 200 /**
 201  * @qemu_chr_fe_get_msgfd:
 202  *
 203  * For backends capable of fd passing, return the latest file descriptor passed
 204  * by a client.
 205  *
 206  * Returns: -1 if fd passing isn't supported or there is no pending file
 207  *          descriptor.  If a file descriptor is returned, subsequent calls to
 208  *          this function will return -1 until a client sends a new file
 209  *          descriptor.
 210  */
 211 int qemu_chr_fe_get_msgfd(CharDriverState *s);
 212
 213 /**
 214  * @qemu_chr_be_can_write:
 215  *
 216  * Determine how much data the front end can currently accept.  This function
 217  * returns the number of bytes the front end can accept.  If it returns 0, the
 218  * front end cannot receive data at the moment.  The function must be polled
 219  * to determine when data can be received.
 220  *
 221  * Returns: the number of bytes the front end can receive via @qemu_chr_be_write
 222  */
 223 int qemu_chr_be_can_write(CharDriverState *s);
 224
 225 /**
 226  * @qemu_chr_be_write:
 227  *
 228  * Write data from the back end to the front end.  Before issuing this call,
 229  * the caller should call @qemu_chr_be_can_write to determine how much data
 230  * the front end can currently accept.
 231  *
 232  * @buf a buffer to receive data from the front end
 233  * @len the number of bytes to receive from the front end
 234  */
 235 void qemu_chr_be_write(CharDriverState *s, uint8_t *buf, int len);
 236
 237
 238 /**
 239  * @qemu_chr_be_event:
 240  *
 241  * Send an event from the back end to the front end.
 242  *
 243  * @event the event to send
 244  */
 245 void qemu_chr_be_event(CharDriverState *s, int event);
 246
 247 void qemu_chr_add_handlers(CharDriverState *s,
 248                            IOCanReadHandler *fd_can_read,
 249                            IOReadHandler *fd_read,
 250                            IOEventHandler *fd_event,
 251                            void *opaque);
 252
 253 void qemu_chr_be_generic_open(CharDriverState *s);
 254 void qemu_chr_accept_input(CharDriverState *s);
 255 int qemu_chr_add_client(CharDriverState *s, int fd);
 256 void qemu_chr_info_print(Monitor *mon, const QObject *ret_data);
 257 void qemu_chr_info(Monitor *mon, QObject **ret_data);
 258 CharDriverState *qemu_chr_find(const char *name);
 259
 260 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
 261
 262 void register_char_driver(const char *name, CharDriverState *(*open)(QemuOpts *));
 263 void register_char_driver_qapi(const char *name, int kind,
 264         void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp));
 265
 266 /* add an eventfd to the qemu devices that are polled */
 267 CharDriverState *qemu_chr_open_eventfd(int eventfd);
 268
 269 extern int term_escape_char;
 270
 271 /* memory chardev */
 272 void qemu_chr_init_mem(CharDriverState *chr);
 273 void qemu_chr_close_mem(CharDriverState *chr);
 274 QString *qemu_chr_mem_to_qs(CharDriverState *chr);
 275 size_t qemu_chr_mem_osize(const CharDriverState *chr);
 276
 277 CharDriverState *qemu_char_get_next_serial(void);
 278
 279 /* msmouse */
 280 CharDriverState *qemu_chr_open_msmouse(void);
 281
 282 /* baum.c */
 283 CharDriverState *chr_baum_init(void);
 284
 285 #endif