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