1 #ifndef QEMU_CHAR_H 2 #define QEMU_CHAR_H 3 4 #include "qapi/qapi-types-char.h" 5 #include "qemu/bitmap.h" 6 #include "qemu/thread.h" 7 #include "qom/object.h" 8 9 #define IAC_EOR 239 10 #define IAC_SE 240 11 #define IAC_NOP 241 12 #define IAC_BREAK 243 13 #define IAC_IP 244 14 #define IAC_SB 250 15 #define IAC 255 16 17 /* character device */ 18 typedef struct CharBackend CharBackend; 19 20 typedef enum { 21 CHR_EVENT_BREAK, /* serial break char */ 22 CHR_EVENT_OPENED, /* new connection established */ 23 CHR_EVENT_MUX_IN, /* mux-focus was set to this terminal */ 24 CHR_EVENT_MUX_OUT, /* mux-focus will move on */ 25 CHR_EVENT_CLOSED /* connection closed. NOTE: currently this event 26 * is only bound to the read port of the chardev. 27 * Normally the read port and write port of a 28 * chardev should be the same, but it can be 29 * different, e.g., for fd chardevs, when the two 30 * fds are different. So when we received the 31 * CLOSED event it's still possible that the out 32 * port is still open. TODO: we should only send 33 * the CLOSED event when both ports are closed. 34 */ 35 } QEMUChrEvent; 36 37 #define CHR_READ_BUF_LEN 4096 38 39 typedef enum { 40 /* Whether the chardev peer is able to close and 41 * reopen the data channel, thus requiring support 42 * for qemu_chr_wait_connected() to wait for a 43 * valid connection */ 44 QEMU_CHAR_FEATURE_RECONNECTABLE, 45 /* Whether it is possible to send/recv file descriptors 46 * over the data channel */ 47 QEMU_CHAR_FEATURE_FD_PASS, 48 /* Whether replay or record mode is enabled */ 49 QEMU_CHAR_FEATURE_REPLAY, 50 /* Whether the gcontext can be changed after calling 51 * qemu_chr_be_update_read_handlers() */ 52 QEMU_CHAR_FEATURE_GCONTEXT, 53 54 QEMU_CHAR_FEATURE_LAST, 55 } ChardevFeature; 56 57 #define qemu_chr_replay(chr) qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_REPLAY) 58 59 struct Chardev { 60 Object parent_obj; 61 62 QemuMutex chr_write_lock; 63 CharBackend *be; 64 char *label; 65 char *filename; 66 int logfd; 67 int be_open; 68 GSource *gsource; 69 GMainContext *gcontext; 70 DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST); 71 }; 72 73 /** 74 * qemu_chr_new_from_opts: 75 * @opts: see qemu-config.c for a list of valid options 76 * @context: the #GMainContext to be used at initialization time 77 * 78 * Create a new character backend from a QemuOpts list. 79 * 80 * Returns: on success: a new character backend 81 * otherwise: NULL; @errp specifies the error 82 * or left untouched in case of help option 83 */ 84 Chardev *qemu_chr_new_from_opts(QemuOpts *opts, 85 GMainContext *context, 86 Error **errp); 87 88 /** 89 * qemu_chr_parse_common: 90 * @opts: the options that still need parsing 91 * @backend: a new backend 92 * 93 * Parse the common options available to all character backends. 94 */ 95 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend); 96 97 /** 98 * qemu_chr_parse_opts: 99 * 100 * Parse the options to the ChardevBackend struct. 101 * 102 * Returns: a new backend or NULL on error 103 */ 104 ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, 105 Error **errp); 106 107 /** 108 * qemu_chr_new: 109 * @label: the name of the backend 110 * @filename: the URI 111 * @context: the #GMainContext to be used at initialization time 112 * 113 * Create a new character backend from a URI. 114 * Do not implicitly initialize a monitor if the chardev is muxed. 115 * 116 * Returns: a new character backend 117 */ 118 Chardev *qemu_chr_new(const char *label, const char *filename, 119 GMainContext *context); 120 121 /** 122 * qemu_chr_new_mux_mon: 123 * @label: the name of the backend 124 * @filename: the URI 125 * @context: the #GMainContext to be used at initialization time 126 * 127 * Create a new character backend from a URI. 128 * Implicitly initialize a monitor if the chardev is muxed. 129 * 130 * Returns: a new character backend 131 */ 132 Chardev *qemu_chr_new_mux_mon(const char *label, const char *filename, 133 GMainContext *context); 134 135 /** 136 * qemu_chr_change: 137 * @opts: the new backend options 138 * 139 * Change an existing character backend 140 */ 141 void qemu_chr_change(QemuOpts *opts, Error **errp); 142 143 /** 144 * qemu_chr_cleanup: 145 * 146 * Delete all chardevs (when leaving qemu) 147 */ 148 void qemu_chr_cleanup(void); 149 150 /** 151 * qemu_chr_new_noreplay: 152 * @label: the name of the backend 153 * @filename: the URI 154 * @permit_mux_mon: if chardev is muxed, initialize a monitor 155 * @context: the #GMainContext to be used at initialization time 156 * 157 * Create a new character backend from a URI. 158 * Character device communications are not written 159 * into the replay log. 160 * 161 * Returns: a new character backend 162 */ 163 Chardev *qemu_chr_new_noreplay(const char *label, const char *filename, 164 bool permit_mux_mon, GMainContext *context); 165 166 /** 167 * qemu_chr_be_can_write: 168 * 169 * Determine how much data the front end can currently accept. This function 170 * returns the number of bytes the front end can accept. If it returns 0, the 171 * front end cannot receive data at the moment. The function must be polled 172 * to determine when data can be received. 173 * 174 * Returns: the number of bytes the front end can receive via @qemu_chr_be_write 175 */ 176 int qemu_chr_be_can_write(Chardev *s); 177 178 /** 179 * qemu_chr_be_write: 180 * @buf: a buffer to receive data from the front end 181 * @len: the number of bytes to receive from the front end 182 * 183 * Write data from the back end to the front end. Before issuing this call, 184 * the caller should call @qemu_chr_be_can_write to determine how much data 185 * the front end can currently accept. 186 */ 187 void qemu_chr_be_write(Chardev *s, uint8_t *buf, int len); 188 189 /** 190 * qemu_chr_be_write_impl: 191 * @buf: a buffer to receive data from the front end 192 * @len: the number of bytes to receive from the front end 193 * 194 * Implementation of back end writing. Used by replay module. 195 */ 196 void qemu_chr_be_write_impl(Chardev *s, uint8_t *buf, int len); 197 198 /** 199 * qemu_chr_be_update_read_handlers: 200 * @context: the gcontext that will be used to attach the watch sources 201 * 202 * Invoked when frontend read handlers are setup 203 */ 204 void qemu_chr_be_update_read_handlers(Chardev *s, 205 GMainContext *context); 206 207 /** 208 * qemu_chr_be_event: 209 * @event: the event to send 210 * 211 * Send an event from the back end to the front end. 212 */ 213 void qemu_chr_be_event(Chardev *s, QEMUChrEvent event); 214 215 int qemu_chr_add_client(Chardev *s, int fd); 216 Chardev *qemu_chr_find(const char *name); 217 218 bool qemu_chr_has_feature(Chardev *chr, 219 ChardevFeature feature); 220 void qemu_chr_set_feature(Chardev *chr, 221 ChardevFeature feature); 222 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename, 223 bool permit_mux_mon); 224 int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all); 225 #define qemu_chr_write_all(s, buf, len) qemu_chr_write(s, buf, len, true) 226 int qemu_chr_wait_connected(Chardev *chr, Error **errp); 227 228 #define TYPE_CHARDEV "chardev" 229 OBJECT_DECLARE_TYPE(Chardev, ChardevClass, CHARDEV) 230 231 #define TYPE_CHARDEV_NULL "chardev-null" 232 #define TYPE_CHARDEV_MUX "chardev-mux" 233 #define TYPE_CHARDEV_RINGBUF "chardev-ringbuf" 234 #define TYPE_CHARDEV_PTY "chardev-pty" 235 #define TYPE_CHARDEV_CONSOLE "chardev-console" 236 #define TYPE_CHARDEV_STDIO "chardev-stdio" 237 #define TYPE_CHARDEV_PIPE "chardev-pipe" 238 #define TYPE_CHARDEV_MEMORY "chardev-memory" 239 #define TYPE_CHARDEV_PARALLEL "chardev-parallel" 240 #define TYPE_CHARDEV_FILE "chardev-file" 241 #define TYPE_CHARDEV_SERIAL "chardev-serial" 242 #define TYPE_CHARDEV_SOCKET "chardev-socket" 243 #define TYPE_CHARDEV_UDP "chardev-udp" 244 245 #define CHARDEV_IS_RINGBUF(chr) \ 246 object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_RINGBUF) 247 #define CHARDEV_IS_PTY(chr) \ 248 object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_PTY) 249 250 struct ChardevClass { 251 ObjectClass parent_class; 252 253 bool internal; /* TODO: eventually use TYPE_USER_CREATABLE */ 254 void (*parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp); 255 256 void (*open)(Chardev *chr, ChardevBackend *backend, 257 bool *be_opened, Error **errp); 258 259 int (*chr_write)(Chardev *s, const uint8_t *buf, int len); 260 int (*chr_sync_read)(Chardev *s, const uint8_t *buf, int len); 261 GSource *(*chr_add_watch)(Chardev *s, GIOCondition cond); 262 void (*chr_update_read_handler)(Chardev *s); 263 int (*chr_ioctl)(Chardev *s, int cmd, void *arg); 264 int (*get_msgfds)(Chardev *s, int* fds, int num); 265 int (*set_msgfds)(Chardev *s, int *fds, int num); 266 int (*chr_add_client)(Chardev *chr, int fd); 267 int (*chr_wait_connected)(Chardev *chr, Error **errp); 268 void (*chr_disconnect)(Chardev *chr); 269 void (*chr_accept_input)(Chardev *chr); 270 void (*chr_set_echo)(Chardev *chr, bool echo); 271 void (*chr_set_fe_open)(Chardev *chr, int fe_open); 272 void (*chr_be_event)(Chardev *s, QEMUChrEvent event); 273 /* Return 0 if succeeded, 1 if failed */ 274 int (*chr_machine_done)(Chardev *chr); 275 }; 276 277 Chardev *qemu_chardev_new(const char *id, const char *typename, 278 ChardevBackend *backend, GMainContext *context, 279 Error **errp); 280 281 extern int term_escape_char; 282 283 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms, 284 GSourceFunc func, void *private); 285 286 /* console.c */ 287 void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp); 288 289 #endif 290