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