char.c (33714B)
1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/cutils.h" 27 #include "monitor/monitor.h" 28 #include "qemu/config-file.h" 29 #include "qemu/error-report.h" 30 #include "qemu/qemu-print.h" 31 #include "chardev/char.h" 32 #include "qapi/error.h" 33 #include "qapi/qapi-commands-char.h" 34 #include "qapi/qmp/qerror.h" 35 #include "sysemu/replay.h" 36 #include "qemu/help_option.h" 37 #include "qemu/module.h" 38 #include "qemu/option.h" 39 #include "qemu/id.h" 40 #include "qemu/coroutine.h" 41 #include "qemu/yank.h" 42 43 #include "chardev-internal.h" 44 45 /***********************************************************/ 46 /* character device */ 47 48 Object *get_chardevs_root(void) 49 { 50 return container_get(object_get_root(), "/chardevs"); 51 } 52 53 static void chr_be_event(Chardev *s, QEMUChrEvent event) 54 { 55 CharBackend *be = s->be; 56 57 if (!be || !be->chr_event) { 58 return; 59 } 60 61 be->chr_event(be->opaque, event); 62 } 63 64 void qemu_chr_be_event(Chardev *s, QEMUChrEvent event) 65 { 66 /* Keep track if the char device is open */ 67 switch (event) { 68 case CHR_EVENT_OPENED: 69 s->be_open = 1; 70 break; 71 case CHR_EVENT_CLOSED: 72 s->be_open = 0; 73 break; 74 case CHR_EVENT_BREAK: 75 case CHR_EVENT_MUX_IN: 76 case CHR_EVENT_MUX_OUT: 77 /* Ignore */ 78 break; 79 } 80 81 CHARDEV_GET_CLASS(s)->chr_be_event(s, event); 82 } 83 84 /* Not reporting errors from writing to logfile, as logs are 85 * defined to be "best effort" only */ 86 static void qemu_chr_write_log(Chardev *s, const uint8_t *buf, size_t len) 87 { 88 size_t done = 0; 89 ssize_t ret; 90 91 if (s->logfd < 0) { 92 return; 93 } 94 95 while (done < len) { 96 retry: 97 ret = write(s->logfd, buf + done, len - done); 98 if (ret == -1 && errno == EAGAIN) { 99 g_usleep(100); 100 goto retry; 101 } 102 103 if (ret <= 0) { 104 return; 105 } 106 done += ret; 107 } 108 } 109 110 static int qemu_chr_write_buffer(Chardev *s, 111 const uint8_t *buf, int len, 112 int *offset, bool write_all) 113 { 114 ChardevClass *cc = CHARDEV_GET_CLASS(s); 115 int res = 0; 116 *offset = 0; 117 118 qemu_mutex_lock(&s->chr_write_lock); 119 while (*offset < len) { 120 retry: 121 res = cc->chr_write(s, buf + *offset, len - *offset); 122 if (res < 0 && errno == EAGAIN && write_all) { 123 if (qemu_in_coroutine()) { 124 qemu_co_sleep_ns(QEMU_CLOCK_REALTIME, 100000); 125 } else { 126 g_usleep(100); 127 } 128 goto retry; 129 } 130 131 if (res <= 0) { 132 break; 133 } 134 135 *offset += res; 136 if (!write_all) { 137 break; 138 } 139 } 140 if (*offset > 0) { 141 /* 142 * If some data was written by backend, we should 143 * only log what was actually written. This method 144 * may be invoked again to write the remaining 145 * method, thus we'll log the remainder at that time. 146 */ 147 qemu_chr_write_log(s, buf, *offset); 148 } else if (res < 0) { 149 /* 150 * If a fatal error was reported by the backend, 151 * assume this method won't be invoked again with 152 * this buffer, so log it all right away. 153 */ 154 qemu_chr_write_log(s, buf, len); 155 } 156 qemu_mutex_unlock(&s->chr_write_lock); 157 158 return res; 159 } 160 161 int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all) 162 { 163 int offset = 0; 164 int res; 165 166 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_PLAY) { 167 replay_char_write_event_load(&res, &offset); 168 assert(offset <= len); 169 qemu_chr_write_buffer(s, buf, offset, &offset, true); 170 return res; 171 } 172 173 res = qemu_chr_write_buffer(s, buf, len, &offset, write_all); 174 175 if (qemu_chr_replay(s) && replay_mode == REPLAY_MODE_RECORD) { 176 replay_char_write_event_save(res, offset); 177 } 178 179 if (res < 0) { 180 return res; 181 } 182 return offset; 183 } 184 185 int qemu_chr_be_can_write(Chardev *s) 186 { 187 CharBackend *be = s->be; 188 189 if (!be || !be->chr_can_read) { 190 return 0; 191 } 192 193 return be->chr_can_read(be->opaque); 194 } 195 196 void qemu_chr_be_write_impl(Chardev *s, const uint8_t *buf, int len) 197 { 198 CharBackend *be = s->be; 199 200 if (be && be->chr_read) { 201 be->chr_read(be->opaque, buf, len); 202 } 203 } 204 205 void qemu_chr_be_write(Chardev *s, const uint8_t *buf, int len) 206 { 207 if (qemu_chr_replay(s)) { 208 if (replay_mode == REPLAY_MODE_PLAY) { 209 return; 210 } 211 replay_chr_be_write(s, buf, len); 212 } else { 213 qemu_chr_be_write_impl(s, buf, len); 214 } 215 } 216 217 void qemu_chr_be_update_read_handlers(Chardev *s, 218 GMainContext *context) 219 { 220 ChardevClass *cc = CHARDEV_GET_CLASS(s); 221 222 assert(qemu_chr_has_feature(s, QEMU_CHAR_FEATURE_GCONTEXT) 223 || !context); 224 s->gcontext = context; 225 if (cc->chr_update_read_handler) { 226 cc->chr_update_read_handler(s); 227 } 228 } 229 230 int qemu_chr_add_client(Chardev *s, int fd) 231 { 232 return CHARDEV_GET_CLASS(s)->chr_add_client ? 233 CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1; 234 } 235 236 static void qemu_char_open(Chardev *chr, ChardevBackend *backend, 237 bool *be_opened, Error **errp) 238 { 239 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 240 /* Any ChardevCommon member would work */ 241 ChardevCommon *common = backend ? backend->u.null.data : NULL; 242 243 if (common && common->has_logfile) { 244 int flags = O_WRONLY; 245 if (common->has_logappend && 246 common->logappend) { 247 flags |= O_APPEND; 248 } else { 249 flags |= O_TRUNC; 250 } 251 chr->logfd = qemu_create(common->logfile, flags, 0666, errp); 252 if (chr->logfd < 0) { 253 return; 254 } 255 } 256 257 if (cc->open) { 258 cc->open(chr, backend, be_opened, errp); 259 } 260 } 261 262 static void char_init(Object *obj) 263 { 264 Chardev *chr = CHARDEV(obj); 265 266 chr->handover_yank_instance = false; 267 chr->logfd = -1; 268 qemu_mutex_init(&chr->chr_write_lock); 269 270 /* 271 * Assume if chr_update_read_handler is implemented it will 272 * take the updated gcontext into account. 273 */ 274 if (CHARDEV_GET_CLASS(chr)->chr_update_read_handler) { 275 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT); 276 } 277 278 } 279 280 static int null_chr_write(Chardev *chr, const uint8_t *buf, int len) 281 { 282 return len; 283 } 284 285 static void char_class_init(ObjectClass *oc, void *data) 286 { 287 ChardevClass *cc = CHARDEV_CLASS(oc); 288 289 cc->chr_write = null_chr_write; 290 cc->chr_be_event = chr_be_event; 291 } 292 293 static void char_finalize(Object *obj) 294 { 295 Chardev *chr = CHARDEV(obj); 296 297 if (chr->be) { 298 chr->be->chr = NULL; 299 } 300 g_free(chr->filename); 301 g_free(chr->label); 302 if (chr->logfd != -1) { 303 close(chr->logfd); 304 } 305 qemu_mutex_destroy(&chr->chr_write_lock); 306 } 307 308 static const TypeInfo char_type_info = { 309 .name = TYPE_CHARDEV, 310 .parent = TYPE_OBJECT, 311 .instance_size = sizeof(Chardev), 312 .instance_init = char_init, 313 .instance_finalize = char_finalize, 314 .abstract = true, 315 .class_size = sizeof(ChardevClass), 316 .class_init = char_class_init, 317 }; 318 319 static bool qemu_chr_is_busy(Chardev *s) 320 { 321 if (CHARDEV_IS_MUX(s)) { 322 MuxChardev *d = MUX_CHARDEV(s); 323 return d->mux_cnt >= 0; 324 } else { 325 return s->be != NULL; 326 } 327 } 328 329 int qemu_chr_wait_connected(Chardev *chr, Error **errp) 330 { 331 ChardevClass *cc = CHARDEV_GET_CLASS(chr); 332 333 if (cc->chr_wait_connected) { 334 return cc->chr_wait_connected(chr, errp); 335 } 336 337 return 0; 338 } 339 340 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename, 341 bool permit_mux_mon) 342 { 343 char host[65], port[33], width[8], height[8]; 344 int pos; 345 const char *p; 346 QemuOpts *opts; 347 Error *local_err = NULL; 348 349 opts = qemu_opts_create(qemu_find_opts("chardev"), label, 1, &local_err); 350 if (local_err) { 351 error_report_err(local_err); 352 return NULL; 353 } 354 355 if (strstart(filename, "mon:", &p)) { 356 if (!permit_mux_mon) { 357 error_report("mon: isn't supported in this context"); 358 return NULL; 359 } 360 filename = p; 361 qemu_opt_set(opts, "mux", "on", &error_abort); 362 if (strcmp(filename, "stdio") == 0) { 363 /* Monitor is muxed to stdio: do not exit on Ctrl+C by default 364 * but pass it to the guest. Handle this only for compat syntax, 365 * for -chardev syntax we have special option for this. 366 * This is what -nographic did, redirecting+muxing serial+monitor 367 * to stdio causing Ctrl+C to be passed to guest. */ 368 qemu_opt_set(opts, "signal", "off", &error_abort); 369 } 370 } 371 372 if (strcmp(filename, "null") == 0 || 373 strcmp(filename, "pty") == 0 || 374 strcmp(filename, "msmouse") == 0 || 375 strcmp(filename, "wctablet") == 0 || 376 strcmp(filename, "braille") == 0 || 377 strcmp(filename, "testdev") == 0 || 378 strcmp(filename, "stdio") == 0) { 379 qemu_opt_set(opts, "backend", filename, &error_abort); 380 return opts; 381 } 382 if (strstart(filename, "vc", &p)) { 383 qemu_opt_set(opts, "backend", "vc", &error_abort); 384 if (*p == ':') { 385 if (sscanf(p+1, "%7[0-9]x%7[0-9]", width, height) == 2) { 386 /* pixels */ 387 qemu_opt_set(opts, "width", width, &error_abort); 388 qemu_opt_set(opts, "height", height, &error_abort); 389 } else if (sscanf(p+1, "%7[0-9]Cx%7[0-9]C", width, height) == 2) { 390 /* chars */ 391 qemu_opt_set(opts, "cols", width, &error_abort); 392 qemu_opt_set(opts, "rows", height, &error_abort); 393 } else { 394 goto fail; 395 } 396 } 397 return opts; 398 } 399 if (strcmp(filename, "con:") == 0) { 400 qemu_opt_set(opts, "backend", "console", &error_abort); 401 return opts; 402 } 403 if (strstart(filename, "COM", NULL)) { 404 qemu_opt_set(opts, "backend", "serial", &error_abort); 405 qemu_opt_set(opts, "path", filename, &error_abort); 406 return opts; 407 } 408 if (strstart(filename, "file:", &p)) { 409 qemu_opt_set(opts, "backend", "file", &error_abort); 410 qemu_opt_set(opts, "path", p, &error_abort); 411 return opts; 412 } 413 if (strstart(filename, "pipe:", &p)) { 414 qemu_opt_set(opts, "backend", "pipe", &error_abort); 415 qemu_opt_set(opts, "path", p, &error_abort); 416 return opts; 417 } 418 if (strstart(filename, "tcp:", &p) || 419 strstart(filename, "telnet:", &p) || 420 strstart(filename, "tn3270:", &p) || 421 strstart(filename, "websocket:", &p)) { 422 if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) { 423 host[0] = 0; 424 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) 425 goto fail; 426 } 427 qemu_opt_set(opts, "backend", "socket", &error_abort); 428 qemu_opt_set(opts, "host", host, &error_abort); 429 qemu_opt_set(opts, "port", port, &error_abort); 430 if (p[pos] == ',') { 431 if (!qemu_opts_do_parse(opts, p + pos + 1, NULL, &local_err)) { 432 error_report_err(local_err); 433 goto fail; 434 } 435 } 436 if (strstart(filename, "telnet:", &p)) { 437 qemu_opt_set(opts, "telnet", "on", &error_abort); 438 } else if (strstart(filename, "tn3270:", &p)) { 439 qemu_opt_set(opts, "tn3270", "on", &error_abort); 440 } else if (strstart(filename, "websocket:", &p)) { 441 qemu_opt_set(opts, "websocket", "on", &error_abort); 442 } 443 return opts; 444 } 445 if (strstart(filename, "udp:", &p)) { 446 qemu_opt_set(opts, "backend", "udp", &error_abort); 447 if (sscanf(p, "%64[^:]:%32[^@,]%n", host, port, &pos) < 2) { 448 host[0] = 0; 449 if (sscanf(p, ":%32[^@,]%n", port, &pos) < 1) { 450 goto fail; 451 } 452 } 453 qemu_opt_set(opts, "host", host, &error_abort); 454 qemu_opt_set(opts, "port", port, &error_abort); 455 if (p[pos] == '@') { 456 p += pos + 1; 457 if (sscanf(p, "%64[^:]:%32[^,]%n", host, port, &pos) < 2) { 458 host[0] = 0; 459 if (sscanf(p, ":%32[^,]%n", port, &pos) < 1) { 460 goto fail; 461 } 462 } 463 qemu_opt_set(opts, "localaddr", host, &error_abort); 464 qemu_opt_set(opts, "localport", port, &error_abort); 465 } 466 return opts; 467 } 468 if (strstart(filename, "unix:", &p)) { 469 qemu_opt_set(opts, "backend", "socket", &error_abort); 470 if (!qemu_opts_do_parse(opts, p, "path", &local_err)) { 471 error_report_err(local_err); 472 goto fail; 473 } 474 return opts; 475 } 476 if (strstart(filename, "/dev/parport", NULL) || 477 strstart(filename, "/dev/ppi", NULL)) { 478 qemu_opt_set(opts, "backend", "parallel", &error_abort); 479 qemu_opt_set(opts, "path", filename, &error_abort); 480 return opts; 481 } 482 if (strstart(filename, "/dev/", NULL)) { 483 qemu_opt_set(opts, "backend", "serial", &error_abort); 484 qemu_opt_set(opts, "path", filename, &error_abort); 485 return opts; 486 } 487 488 error_report("'%s' is not a valid char driver", filename); 489 490 fail: 491 qemu_opts_del(opts); 492 return NULL; 493 } 494 495 void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend) 496 { 497 const char *logfile = qemu_opt_get(opts, "logfile"); 498 499 backend->has_logfile = logfile != NULL; 500 backend->logfile = g_strdup(logfile); 501 502 backend->has_logappend = true; 503 backend->logappend = qemu_opt_get_bool(opts, "logappend", false); 504 } 505 506 static const ChardevClass *char_get_class(const char *driver, Error **errp) 507 { 508 ObjectClass *oc; 509 const ChardevClass *cc; 510 char *typename = g_strdup_printf("chardev-%s", driver); 511 512 oc = module_object_class_by_name(typename); 513 g_free(typename); 514 515 if (!object_class_dynamic_cast(oc, TYPE_CHARDEV)) { 516 error_setg(errp, "'%s' is not a valid char driver name", driver); 517 return NULL; 518 } 519 520 if (object_class_is_abstract(oc)) { 521 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver", 522 "an abstract device type"); 523 return NULL; 524 } 525 526 cc = CHARDEV_CLASS(oc); 527 if (cc->internal) { 528 error_setg(errp, "'%s' is not a valid char driver name", driver); 529 return NULL; 530 } 531 532 return cc; 533 } 534 535 static struct ChardevAlias { 536 const char *typename; 537 const char *alias; 538 bool deprecation_warning_printed; 539 } chardev_alias_table[] = { 540 #ifdef HAVE_CHARDEV_PARPORT 541 { "parallel", "parport" }, 542 #endif 543 #ifdef HAVE_CHARDEV_SERIAL 544 { "serial", "tty" }, 545 #endif 546 }; 547 548 typedef struct ChadevClassFE { 549 void (*fn)(const char *name, void *opaque); 550 void *opaque; 551 } ChadevClassFE; 552 553 static void 554 chardev_class_foreach(ObjectClass *klass, void *opaque) 555 { 556 ChadevClassFE *fe = opaque; 557 558 assert(g_str_has_prefix(object_class_get_name(klass), "chardev-")); 559 if (CHARDEV_CLASS(klass)->internal) { 560 return; 561 } 562 563 fe->fn(object_class_get_name(klass) + 8, fe->opaque); 564 } 565 566 static void 567 chardev_name_foreach(void (*fn)(const char *name, void *opaque), 568 void *opaque) 569 { 570 ChadevClassFE fe = { .fn = fn, .opaque = opaque }; 571 572 object_class_foreach(chardev_class_foreach, TYPE_CHARDEV, false, &fe); 573 } 574 575 static void 576 help_string_append(const char *name, void *opaque) 577 { 578 GString *str = opaque; 579 580 g_string_append_printf(str, "\n %s", name); 581 } 582 583 static const char *chardev_alias_translate(const char *name) 584 { 585 int i; 586 for (i = 0; i < (int)ARRAY_SIZE(chardev_alias_table); i++) { 587 if (g_strcmp0(chardev_alias_table[i].alias, name) == 0) { 588 if (!chardev_alias_table[i].deprecation_warning_printed) { 589 warn_report("The alias '%s' is deprecated, use '%s' instead", 590 name, chardev_alias_table[i].typename); 591 chardev_alias_table[i].deprecation_warning_printed = true; 592 } 593 return chardev_alias_table[i].typename; 594 } 595 } 596 return name; 597 } 598 599 ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, Error **errp) 600 { 601 Error *local_err = NULL; 602 const ChardevClass *cc; 603 ChardevBackend *backend = NULL; 604 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 605 606 if (name == NULL) { 607 error_setg(errp, "chardev: \"%s\" missing backend", 608 qemu_opts_id(opts)); 609 return NULL; 610 } 611 612 cc = char_get_class(name, errp); 613 if (cc == NULL) { 614 return NULL; 615 } 616 617 backend = g_new0(ChardevBackend, 1); 618 backend->type = CHARDEV_BACKEND_KIND_NULL; 619 620 if (cc->parse) { 621 cc->parse(opts, backend, &local_err); 622 if (local_err) { 623 error_propagate(errp, local_err); 624 qapi_free_ChardevBackend(backend); 625 return NULL; 626 } 627 } else { 628 ChardevCommon *ccom = g_new0(ChardevCommon, 1); 629 qemu_chr_parse_common(opts, ccom); 630 backend->u.null.data = ccom; /* Any ChardevCommon member would work */ 631 } 632 633 return backend; 634 } 635 636 Chardev *qemu_chr_new_from_opts(QemuOpts *opts, GMainContext *context, 637 Error **errp) 638 { 639 const ChardevClass *cc; 640 Chardev *chr = NULL; 641 ChardevBackend *backend = NULL; 642 const char *name = chardev_alias_translate(qemu_opt_get(opts, "backend")); 643 const char *id = qemu_opts_id(opts); 644 char *bid = NULL; 645 646 if (name && is_help_option(name)) { 647 GString *str = g_string_new(""); 648 649 chardev_name_foreach(help_string_append, str); 650 651 qemu_printf("Available chardev backend types: %s\n", str->str); 652 g_string_free(str, true); 653 return NULL; 654 } 655 656 if (id == NULL) { 657 error_setg(errp, "chardev: no id specified"); 658 return NULL; 659 } 660 661 backend = qemu_chr_parse_opts(opts, errp); 662 if (backend == NULL) { 663 return NULL; 664 } 665 666 cc = char_get_class(name, errp); 667 if (cc == NULL) { 668 goto out; 669 } 670 671 if (qemu_opt_get_bool(opts, "mux", 0)) { 672 bid = g_strdup_printf("%s-base", id); 673 } 674 675 chr = qemu_chardev_new(bid ? bid : id, 676 object_class_get_name(OBJECT_CLASS(cc)), 677 backend, context, errp); 678 679 if (chr == NULL) { 680 goto out; 681 } 682 683 if (bid) { 684 Chardev *mux; 685 qapi_free_ChardevBackend(backend); 686 backend = g_new0(ChardevBackend, 1); 687 backend->type = CHARDEV_BACKEND_KIND_MUX; 688 backend->u.mux.data = g_new0(ChardevMux, 1); 689 backend->u.mux.data->chardev = g_strdup(bid); 690 mux = qemu_chardev_new(id, TYPE_CHARDEV_MUX, backend, context, errp); 691 if (mux == NULL) { 692 object_unparent(OBJECT(chr)); 693 chr = NULL; 694 goto out; 695 } 696 chr = mux; 697 } 698 699 out: 700 qapi_free_ChardevBackend(backend); 701 g_free(bid); 702 return chr; 703 } 704 705 Chardev *qemu_chr_new_noreplay(const char *label, const char *filename, 706 bool permit_mux_mon, GMainContext *context) 707 { 708 const char *p; 709 Chardev *chr; 710 QemuOpts *opts; 711 Error *err = NULL; 712 713 if (strstart(filename, "chardev:", &p)) { 714 return qemu_chr_find(p); 715 } 716 717 opts = qemu_chr_parse_compat(label, filename, permit_mux_mon); 718 if (!opts) 719 return NULL; 720 721 chr = qemu_chr_new_from_opts(opts, context, &err); 722 if (!chr) { 723 error_report_err(err); 724 goto out; 725 } 726 727 if (qemu_opt_get_bool(opts, "mux", 0)) { 728 assert(permit_mux_mon); 729 monitor_init_hmp(chr, true, &err); 730 if (err) { 731 error_report_err(err); 732 object_unparent(OBJECT(chr)); 733 chr = NULL; 734 goto out; 735 } 736 } 737 738 out: 739 qemu_opts_del(opts); 740 return chr; 741 } 742 743 static Chardev *qemu_chr_new_permit_mux_mon(const char *label, 744 const char *filename, 745 bool permit_mux_mon, 746 GMainContext *context) 747 { 748 Chardev *chr; 749 chr = qemu_chr_new_noreplay(label, filename, permit_mux_mon, context); 750 if (chr) { 751 if (replay_mode != REPLAY_MODE_NONE) { 752 qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_REPLAY); 753 } 754 if (qemu_chr_replay(chr) && CHARDEV_GET_CLASS(chr)->chr_ioctl) { 755 error_report("Replay: ioctl is not supported " 756 "for serial devices yet"); 757 } 758 replay_register_char_driver(chr); 759 } 760 return chr; 761 } 762 763 Chardev *qemu_chr_new(const char *label, const char *filename, 764 GMainContext *context) 765 { 766 return qemu_chr_new_permit_mux_mon(label, filename, false, context); 767 } 768 769 Chardev *qemu_chr_new_mux_mon(const char *label, const char *filename, 770 GMainContext *context) 771 { 772 return qemu_chr_new_permit_mux_mon(label, filename, true, context); 773 } 774 775 static int qmp_query_chardev_foreach(Object *obj, void *data) 776 { 777 Chardev *chr = CHARDEV(obj); 778 ChardevInfoList **list = data; 779 ChardevInfo *value = g_malloc0(sizeof(*value)); 780 781 value->label = g_strdup(chr->label); 782 value->filename = g_strdup(chr->filename); 783 value->frontend_open = chr->be && chr->be->fe_open; 784 785 QAPI_LIST_PREPEND(*list, value); 786 787 return 0; 788 } 789 790 ChardevInfoList *qmp_query_chardev(Error **errp) 791 { 792 ChardevInfoList *chr_list = NULL; 793 794 object_child_foreach(get_chardevs_root(), 795 qmp_query_chardev_foreach, &chr_list); 796 797 return chr_list; 798 } 799 800 static void 801 qmp_prepend_backend(const char *name, void *opaque) 802 { 803 ChardevBackendInfoList **list = opaque; 804 ChardevBackendInfo *value; 805 806 value = g_new0(ChardevBackendInfo, 1); 807 value->name = g_strdup(name); 808 QAPI_LIST_PREPEND(*list, value); 809 } 810 811 ChardevBackendInfoList *qmp_query_chardev_backends(Error **errp) 812 { 813 ChardevBackendInfoList *backend_list = NULL; 814 815 chardev_name_foreach(qmp_prepend_backend, &backend_list); 816 817 return backend_list; 818 } 819 820 Chardev *qemu_chr_find(const char *name) 821 { 822 Object *obj = object_resolve_path_component(get_chardevs_root(), name); 823 824 return obj ? CHARDEV(obj) : NULL; 825 } 826 827 QemuOptsList qemu_chardev_opts = { 828 .name = "chardev", 829 .implied_opt_name = "backend", 830 .head = QTAILQ_HEAD_INITIALIZER(qemu_chardev_opts.head), 831 .desc = { 832 { 833 .name = "backend", 834 .type = QEMU_OPT_STRING, 835 },{ 836 .name = "path", 837 .type = QEMU_OPT_STRING, 838 },{ 839 .name = "host", 840 .type = QEMU_OPT_STRING, 841 },{ 842 .name = "port", 843 .type = QEMU_OPT_STRING, 844 },{ 845 .name = "fd", 846 .type = QEMU_OPT_STRING, 847 },{ 848 .name = "localaddr", 849 .type = QEMU_OPT_STRING, 850 },{ 851 .name = "localport", 852 .type = QEMU_OPT_STRING, 853 },{ 854 .name = "to", 855 .type = QEMU_OPT_NUMBER, 856 },{ 857 .name = "ipv4", 858 .type = QEMU_OPT_BOOL, 859 },{ 860 .name = "ipv6", 861 .type = QEMU_OPT_BOOL, 862 },{ 863 .name = "wait", 864 .type = QEMU_OPT_BOOL, 865 },{ 866 .name = "server", 867 .type = QEMU_OPT_BOOL, 868 },{ 869 .name = "delay", 870 .type = QEMU_OPT_BOOL, 871 },{ 872 .name = "nodelay", 873 .type = QEMU_OPT_BOOL, 874 },{ 875 .name = "reconnect", 876 .type = QEMU_OPT_NUMBER, 877 },{ 878 .name = "telnet", 879 .type = QEMU_OPT_BOOL, 880 },{ 881 .name = "tn3270", 882 .type = QEMU_OPT_BOOL, 883 },{ 884 .name = "tls-creds", 885 .type = QEMU_OPT_STRING, 886 },{ 887 .name = "tls-authz", 888 .type = QEMU_OPT_STRING, 889 },{ 890 .name = "websocket", 891 .type = QEMU_OPT_BOOL, 892 },{ 893 .name = "width", 894 .type = QEMU_OPT_NUMBER, 895 },{ 896 .name = "height", 897 .type = QEMU_OPT_NUMBER, 898 },{ 899 .name = "cols", 900 .type = QEMU_OPT_NUMBER, 901 },{ 902 .name = "rows", 903 .type = QEMU_OPT_NUMBER, 904 },{ 905 .name = "mux", 906 .type = QEMU_OPT_BOOL, 907 },{ 908 .name = "signal", 909 .type = QEMU_OPT_BOOL, 910 },{ 911 .name = "name", 912 .type = QEMU_OPT_STRING, 913 },{ 914 .name = "debug", 915 .type = QEMU_OPT_NUMBER, 916 },{ 917 .name = "size", 918 .type = QEMU_OPT_SIZE, 919 },{ 920 .name = "chardev", 921 .type = QEMU_OPT_STRING, 922 },{ 923 .name = "append", 924 .type = QEMU_OPT_BOOL, 925 },{ 926 .name = "logfile", 927 .type = QEMU_OPT_STRING, 928 },{ 929 .name = "logappend", 930 .type = QEMU_OPT_BOOL, 931 },{ 932 .name = "mouse", 933 .type = QEMU_OPT_BOOL, 934 },{ 935 .name = "clipboard", 936 .type = QEMU_OPT_BOOL, 937 #ifdef CONFIG_LINUX 938 },{ 939 .name = "tight", 940 .type = QEMU_OPT_BOOL, 941 .def_value_str = "on", 942 },{ 943 .name = "abstract", 944 .type = QEMU_OPT_BOOL, 945 #endif 946 }, 947 { /* end of list */ } 948 }, 949 }; 950 951 bool qemu_chr_has_feature(Chardev *chr, 952 ChardevFeature feature) 953 { 954 return test_bit(feature, chr->features); 955 } 956 957 void qemu_chr_set_feature(Chardev *chr, 958 ChardevFeature feature) 959 { 960 return set_bit(feature, chr->features); 961 } 962 963 static Chardev *chardev_new(const char *id, const char *typename, 964 ChardevBackend *backend, 965 GMainContext *gcontext, 966 bool handover_yank_instance, 967 Error **errp) 968 { 969 Object *obj; 970 Chardev *chr = NULL; 971 Error *local_err = NULL; 972 bool be_opened = true; 973 974 assert(g_str_has_prefix(typename, "chardev-")); 975 assert(id); 976 977 obj = object_new(typename); 978 chr = CHARDEV(obj); 979 chr->handover_yank_instance = handover_yank_instance; 980 chr->label = g_strdup(id); 981 chr->gcontext = gcontext; 982 983 qemu_char_open(chr, backend, &be_opened, &local_err); 984 if (local_err) { 985 error_propagate(errp, local_err); 986 object_unref(obj); 987 return NULL; 988 } 989 990 if (!chr->filename) { 991 chr->filename = g_strdup(typename + 8); 992 } 993 if (be_opened) { 994 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 995 } 996 997 return chr; 998 } 999 1000 Chardev *qemu_chardev_new(const char *id, const char *typename, 1001 ChardevBackend *backend, 1002 GMainContext *gcontext, 1003 Error **errp) 1004 { 1005 Chardev *chr; 1006 g_autofree char *genid = NULL; 1007 1008 if (!id) { 1009 genid = id_generate(ID_CHR); 1010 id = genid; 1011 } 1012 1013 chr = chardev_new(id, typename, backend, gcontext, false, errp); 1014 if (!chr) { 1015 return NULL; 1016 } 1017 1018 if (!object_property_try_add_child(get_chardevs_root(), id, OBJECT(chr), 1019 errp)) { 1020 object_unref(OBJECT(chr)); 1021 return NULL; 1022 } 1023 object_unref(OBJECT(chr)); 1024 1025 return chr; 1026 } 1027 1028 ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, 1029 Error **errp) 1030 { 1031 ERRP_GUARD(); 1032 const ChardevClass *cc; 1033 ChardevReturn *ret; 1034 g_autoptr(Chardev) chr = NULL; 1035 1036 if (qemu_chr_find(id)) { 1037 error_setg(errp, "Chardev with id '%s' already exists", id); 1038 return NULL; 1039 } 1040 1041 cc = char_get_class(ChardevBackendKind_str(backend->type), errp); 1042 if (!cc) { 1043 goto err; 1044 } 1045 1046 chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)), 1047 backend, NULL, false, errp); 1048 if (!chr) { 1049 goto err; 1050 } 1051 1052 if (!object_property_try_add_child(get_chardevs_root(), id, OBJECT(chr), 1053 errp)) { 1054 goto err; 1055 } 1056 1057 ret = g_new0(ChardevReturn, 1); 1058 if (CHARDEV_IS_PTY(chr)) { 1059 ret->pty = g_strdup(chr->filename + 4); 1060 ret->has_pty = true; 1061 } 1062 1063 return ret; 1064 1065 err: 1066 error_prepend(errp, "Failed to add chardev '%s': ", id); 1067 return NULL; 1068 } 1069 1070 ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, 1071 Error **errp) 1072 { 1073 CharBackend *be; 1074 const ChardevClass *cc, *cc_new; 1075 Chardev *chr, *chr_new; 1076 bool closed_sent = false; 1077 bool handover_yank_instance; 1078 ChardevReturn *ret; 1079 1080 chr = qemu_chr_find(id); 1081 if (!chr) { 1082 error_setg(errp, "Chardev '%s' does not exist", id); 1083 return NULL; 1084 } 1085 1086 if (CHARDEV_IS_MUX(chr)) { 1087 error_setg(errp, "Mux device hotswap not supported yet"); 1088 return NULL; 1089 } 1090 1091 if (qemu_chr_replay(chr)) { 1092 error_setg(errp, 1093 "Chardev '%s' cannot be changed in record/replay mode", id); 1094 return NULL; 1095 } 1096 1097 be = chr->be; 1098 if (!be) { 1099 /* easy case */ 1100 object_unparent(OBJECT(chr)); 1101 return qmp_chardev_add(id, backend, errp); 1102 } 1103 1104 if (!be->chr_be_change) { 1105 error_setg(errp, "Chardev user does not support chardev hotswap"); 1106 return NULL; 1107 } 1108 1109 cc = CHARDEV_GET_CLASS(chr); 1110 cc_new = char_get_class(ChardevBackendKind_str(backend->type), errp); 1111 if (!cc_new) { 1112 return NULL; 1113 } 1114 1115 /* 1116 * The new chardev should not register a yank instance if the current 1117 * chardev has registered one already. 1118 */ 1119 handover_yank_instance = cc->supports_yank && cc_new->supports_yank; 1120 1121 chr_new = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc_new)), 1122 backend, chr->gcontext, handover_yank_instance, errp); 1123 if (!chr_new) { 1124 return NULL; 1125 } 1126 1127 if (chr->be_open && !chr_new->be_open) { 1128 qemu_chr_be_event(chr, CHR_EVENT_CLOSED); 1129 closed_sent = true; 1130 } 1131 1132 chr->be = NULL; 1133 qemu_chr_fe_init(be, chr_new, &error_abort); 1134 1135 if (be->chr_be_change(be->opaque) < 0) { 1136 error_setg(errp, "Chardev '%s' change failed", chr_new->label); 1137 chr_new->be = NULL; 1138 qemu_chr_fe_init(be, chr, &error_abort); 1139 if (closed_sent) { 1140 qemu_chr_be_event(chr, CHR_EVENT_OPENED); 1141 } 1142 object_unref(OBJECT(chr_new)); 1143 return NULL; 1144 } 1145 1146 /* change successfull, clean up */ 1147 chr_new->handover_yank_instance = false; 1148 1149 /* 1150 * When the old chardev is freed, it should not unregister the yank 1151 * instance if the new chardev needs it. 1152 */ 1153 chr->handover_yank_instance = handover_yank_instance; 1154 1155 object_unparent(OBJECT(chr)); 1156 object_property_add_child(get_chardevs_root(), chr_new->label, 1157 OBJECT(chr_new)); 1158 object_unref(OBJECT(chr_new)); 1159 1160 ret = g_new0(ChardevReturn, 1); 1161 if (CHARDEV_IS_PTY(chr_new)) { 1162 ret->pty = g_strdup(chr_new->filename + 4); 1163 ret->has_pty = true; 1164 } 1165 1166 return ret; 1167 } 1168 1169 void qmp_chardev_remove(const char *id, Error **errp) 1170 { 1171 Chardev *chr; 1172 1173 chr = qemu_chr_find(id); 1174 if (chr == NULL) { 1175 error_setg(errp, "Chardev '%s' not found", id); 1176 return; 1177 } 1178 if (qemu_chr_is_busy(chr)) { 1179 error_setg(errp, "Chardev '%s' is busy", id); 1180 return; 1181 } 1182 if (qemu_chr_replay(chr)) { 1183 error_setg(errp, 1184 "Chardev '%s' cannot be unplugged in record/replay mode", id); 1185 return; 1186 } 1187 object_unparent(OBJECT(chr)); 1188 } 1189 1190 void qmp_chardev_send_break(const char *id, Error **errp) 1191 { 1192 Chardev *chr; 1193 1194 chr = qemu_chr_find(id); 1195 if (chr == NULL) { 1196 error_setg(errp, "Chardev '%s' not found", id); 1197 return; 1198 } 1199 qemu_chr_be_event(chr, CHR_EVENT_BREAK); 1200 } 1201 1202 /* 1203 * Add a timeout callback for the chardev (in milliseconds), return 1204 * the GSource object created. Please use this to add timeout hook for 1205 * chardev instead of g_timeout_add() and g_timeout_add_seconds(), to 1206 * make sure the gcontext that the task bound to is correct. 1207 */ 1208 GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms, 1209 GSourceFunc func, void *private) 1210 { 1211 GSource *source = g_timeout_source_new(ms); 1212 1213 assert(func); 1214 g_source_set_callback(source, func, private, NULL); 1215 g_source_attach(source, chr->gcontext); 1216 1217 return source; 1218 } 1219 1220 void qemu_chr_cleanup(void) 1221 { 1222 object_unparent(get_chardevs_root()); 1223 } 1224 1225 static void register_types(void) 1226 { 1227 type_register_static(&char_type_info); 1228 } 1229 1230 type_init(register_types);