tests/test-char.c

   1 #include "qemu/osdep.h"
   2 #include <glib/gstdio.h>
   3
   4 #include "qemu/config-file.h"
   5 #include "qemu/option.h"
   6 #include "qemu/sockets.h"
   7 #include "chardev/char-fe.h"
   8 #include "chardev/char-mux.h"
   9 #include "sysemu/sysemu.h"
  10 #include "qapi/error.h"
  11 #include "qapi/qapi-commands-char.h"
  12 #include "qapi/qmp/qdict.h"
  13 #include "qom/qom-qobject.h"
  14
  15 static bool quit;
  16
  17 typedef struct FeHandler {
  18     int read_count;
  19     int last_event;
  20     char read_buf[128];
  21 } FeHandler;
  22
  23 static void main_loop(void)
  24 {
  25     quit = false;
  26     do {
  27         main_loop_wait(false);
  28     } while (!quit);
  29 }
  30
  31 static int fe_can_read(void *opaque)
  32 {
  33     FeHandler *h = opaque;
  34
  35     return sizeof(h->read_buf) - h->read_count;
  36 }
  37
  38 static void fe_read(void *opaque, const uint8_t *buf, int size)
  39 {
  40     FeHandler *h = opaque;
  41
  42     g_assert_cmpint(size, <=, fe_can_read(opaque));
  43
  44     memcpy(h->read_buf + h->read_count, buf, size);
  45     h->read_count += size;
  46     quit = true;
  47 }
  48
  49 static void fe_event(void *opaque, int event)
  50 {
  51     FeHandler *h = opaque;
  52
  53     h->last_event = event;
  54     if (event != CHR_EVENT_BREAK) {
  55         quit = true;
  56     }
  57 }
  58
  59 #ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
  60 #ifdef _WIN32
  61 static void char_console_test_subprocess(void)
  62 {
  63     QemuOpts *opts;
  64     Chardev *chr;
  65
  66     opts = qemu_opts_create(qemu_find_opts("chardev"), "console-label",
  67                             1, &error_abort);
  68     qemu_opt_set(opts, "backend", "console", &error_abort);
  69
  70     chr = qemu_chr_new_from_opts(opts, NULL);
  71     g_assert_nonnull(chr);
  72
  73     qemu_chr_write_all(chr, (const uint8_t *)"CONSOLE", 7);
  74
  75     qemu_opts_del(opts);
  76     object_unparent(OBJECT(chr));
  77 }
  78
  79 static void char_console_test(void)
  80 {
  81     g_test_trap_subprocess("/char/console/subprocess", 0, 0);
  82     g_test_trap_assert_passed();
  83     g_test_trap_assert_stdout("CONSOLE");
  84 }
  85 #endif
  86 static void char_stdio_test_subprocess(void)
  87 {
  88     Chardev *chr;
  89     CharBackend be;
  90     int ret;
  91
  92     chr = qemu_chr_new("label", "stdio");
  93     g_assert_nonnull(chr);
  94
  95     qemu_chr_fe_init(&be, chr, &error_abort);
  96     qemu_chr_fe_set_open(&be, true);
  97     ret = qemu_chr_fe_write(&be, (void *)"buf", 4);
  98     g_assert_cmpint(ret, ==, 4);
  99
 100     qemu_chr_fe_deinit(&be, true);
 101 }
 102
 103 static void char_stdio_test(void)
 104 {
 105     g_test_trap_subprocess("/char/stdio/subprocess", 0, 0);
 106     g_test_trap_assert_passed();
 107     g_test_trap_assert_stdout("buf");
 108 }
 109 #endif
 110
 111 static void char_ringbuf_test(void)
 112 {
 113     QemuOpts *opts;
 114     Chardev *chr;
 115     CharBackend be;
 116     char *data;
 117     int ret;
 118
 119     opts = qemu_opts_create(qemu_find_opts("chardev"), "ringbuf-label",
 120                             1, &error_abort);
 121     qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
 122
 123     qemu_opt_set(opts, "size", "5", &error_abort);
 124     chr = qemu_chr_new_from_opts(opts, NULL);
 125     g_assert_null(chr);
 126     qemu_opts_del(opts);
 127
 128     opts = qemu_opts_create(qemu_find_opts("chardev"), "ringbuf-label",
 129                             1, &error_abort);
 130     qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
 131     qemu_opt_set(opts, "size", "2", &error_abort);
 132     chr = qemu_chr_new_from_opts(opts, &error_abort);
 133     g_assert_nonnull(chr);
 134     qemu_opts_del(opts);
 135
 136     qemu_chr_fe_init(&be, chr, &error_abort);
 137     ret = qemu_chr_fe_write(&be, (void *)"buff", 4);
 138     g_assert_cmpint(ret, ==, 4);
 139
 140     data = qmp_ringbuf_read("ringbuf-label", 4, false, 0, &error_abort);
 141     g_assert_cmpstr(data, ==, "ff");
 142     g_free(data);
 143
 144     data = qmp_ringbuf_read("ringbuf-label", 4, false, 0, &error_abort);
 145     g_assert_cmpstr(data, ==, "");
 146     g_free(data);
 147
 148     qemu_chr_fe_deinit(&be, true);
 149
 150     /* check alias */
 151     opts = qemu_opts_create(qemu_find_opts("chardev"), "memory-label",
 152                             1, &error_abort);
 153     qemu_opt_set(opts, "backend", "memory", &error_abort);
 154     qemu_opt_set(opts, "size", "2", &error_abort);
 155     chr = qemu_chr_new_from_opts(opts, NULL);
 156     g_assert_nonnull(chr);
 157     object_unparent(OBJECT(chr));
 158     qemu_opts_del(opts);
 159 }
 160
 161 static void char_mux_test(void)
 162 {
 163     QemuOpts *opts;
 164     Chardev *chr, *base;
 165     char *data;
 166     FeHandler h1 = { 0, }, h2 = { 0, };
 167     CharBackend chr_be1, chr_be2;
 168
 169     muxes_realized = true; /* done after machine init */
 170     opts = qemu_opts_create(qemu_find_opts("chardev"), "mux-label",
 171                             1, &error_abort);
 172     qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
 173     qemu_opt_set(opts, "size", "128", &error_abort);
 174     qemu_opt_set(opts, "mux", "on", &error_abort);
 175     chr = qemu_chr_new_from_opts(opts, &error_abort);
 176     g_assert_nonnull(chr);
 177     qemu_opts_del(opts);
 178
 179     qemu_chr_fe_init(&chr_be1, chr, &error_abort);
 180     qemu_chr_fe_set_handlers(&chr_be1,
 181                              fe_can_read,
 182                              fe_read,
 183                              fe_event,
 184                              NULL,
 185                              &h1,
 186                              NULL, true);
 187
 188     qemu_chr_fe_init(&chr_be2, chr, &error_abort);
 189     qemu_chr_fe_set_handlers(&chr_be2,
 190                              fe_can_read,
 191                              fe_read,
 192                              fe_event,
 193                              NULL,
 194                              &h2,
 195                              NULL, true);
 196     qemu_chr_fe_take_focus(&chr_be2);
 197
 198     base = qemu_chr_find("mux-label-base");
 199     g_assert_cmpint(qemu_chr_be_can_write(base), !=, 0);
 200
 201     qemu_chr_be_write(base, (void *)"hello", 6);
 202     g_assert_cmpint(h1.read_count, ==, 0);
 203     g_assert_cmpint(h2.read_count, ==, 6);
 204     g_assert_cmpstr(h2.read_buf, ==, "hello");
 205     h2.read_count = 0;
 206
 207     g_assert_cmpint(h1.last_event, !=, 42); /* should be MUX_OUT or OPENED */
 208     g_assert_cmpint(h2.last_event, !=, 42); /* should be MUX_IN or OPENED */
 209     /* sending event on the base broadcast to all fe, historical reasons? */
 210     qemu_chr_be_event(base, 42);
 211     g_assert_cmpint(h1.last_event, ==, 42);
 212     g_assert_cmpint(h2.last_event, ==, 42);
 213     qemu_chr_be_event(chr, -1);
 214     g_assert_cmpint(h1.last_event, ==, 42);
 215     g_assert_cmpint(h2.last_event, ==, -1);
 216
 217     /* switch focus */
 218     qemu_chr_be_write(base, (void *)"\1c", 2);
 219     g_assert_cmpint(h1.last_event, ==, CHR_EVENT_MUX_IN);
 220     g_assert_cmpint(h2.last_event, ==, CHR_EVENT_MUX_OUT);
 221     qemu_chr_be_event(chr, -1);
 222     g_assert_cmpint(h1.last_event, ==, -1);
 223     g_assert_cmpint(h2.last_event, ==, CHR_EVENT_MUX_OUT);
 224
 225     qemu_chr_be_write(base, (void *)"hello", 6);
 226     g_assert_cmpint(h2.read_count, ==, 0);
 227     g_assert_cmpint(h1.read_count, ==, 6);
 228     g_assert_cmpstr(h1.read_buf, ==, "hello");
 229     h1.read_count = 0;
 230
 231     /* remove first handler */
 232     qemu_chr_fe_set_handlers(&chr_be1, NULL, NULL, NULL, NULL,
 233                              NULL, NULL, true);
 234     qemu_chr_be_write(base, (void *)"hello", 6);
 235     g_assert_cmpint(h1.read_count, ==, 0);
 236     g_assert_cmpint(h2.read_count, ==, 0);
 237
 238     qemu_chr_be_write(base, (void *)"\1c", 2);
 239     qemu_chr_be_write(base, (void *)"hello", 6);
 240     g_assert_cmpint(h1.read_count, ==, 0);
 241     g_assert_cmpint(h2.read_count, ==, 6);
 242     g_assert_cmpstr(h2.read_buf, ==, "hello");
 243     h2.read_count = 0;
 244
 245     /* print help */
 246     qemu_chr_be_write(base, (void *)"\1?", 2);
 247     data = qmp_ringbuf_read("mux-label-base", 128, false, 0, &error_abort);
 248     g_assert_cmpint(strlen(data), !=, 0);
 249     g_free(data);
 250
 251     qemu_chr_fe_deinit(&chr_be1, false);
 252     qemu_chr_fe_deinit(&chr_be2, true);
 253 }
 254
 255 typedef struct SocketIdleData {
 256     GMainLoop *loop;
 257     Chardev *chr;
 258     bool conn_expected;
 259     CharBackend *be;
 260     CharBackend *client_be;
 261 } SocketIdleData;
 262
 263 static gboolean char_socket_test_idle(gpointer user_data)
 264 {
 265     SocketIdleData *data = user_data;
 266
 267     if (object_property_get_bool(OBJECT(data->chr), "connected", NULL)
 268         == data->conn_expected) {
 269         quit = true;
 270         return FALSE;
 271     }
 272
 273     return TRUE;
 274 }
 275
 276 static void socket_read(void *opaque, const uint8_t *buf, int size)
 277 {
 278     SocketIdleData *data = opaque;
 279
 280     g_assert_cmpint(size, ==, 1);
 281     g_assert_cmpint(*buf, ==, 'Z');
 282
 283     size = qemu_chr_fe_write(data->be, (const uint8_t *)"hello", 5);
 284     g_assert_cmpint(size, ==, 5);
 285 }
 286
 287 static int socket_can_read(void *opaque)
 288 {
 289     return 10;
 290 }
 291
 292 static void socket_read_hello(void *opaque, const uint8_t *buf, int size)
 293 {
 294     g_assert_cmpint(size, ==, 5);
 295     g_assert(strncmp((char *)buf, "hello", 5) == 0);
 296
 297     quit = true;
 298 }
 299
 300 static int socket_can_read_hello(void *opaque)
 301 {
 302     return 10;
 303 }
 304
 305 static void char_socket_test_common(Chardev *chr)
 306 {
 307     Chardev *chr_client;
 308     QObject *addr;
 309     QDict *qdict;
 310     const char *port;
 311     SocketIdleData d = { .chr = chr };
 312     CharBackend be;
 313     CharBackend client_be;
 314     char *tmp;
 315
 316     d.be = &be;
 317     d.client_be = &be;
 318
 319     g_assert_nonnull(chr);
 320     g_assert(!object_property_get_bool(OBJECT(chr), "connected", &error_abort));
 321
 322     addr = object_property_get_qobject(OBJECT(chr), "addr", &error_abort);
 323     qdict = qobject_to_qdict(addr);
 324     port = qdict_get_str(qdict, "port");
 325     tmp = g_strdup_printf("tcp:127.0.0.1:%s", port);
 326     QDECREF(qdict);
 327
 328     qemu_chr_fe_init(&be, chr, &error_abort);
 329     qemu_chr_fe_set_handlers(&be, socket_can_read, socket_read,
 330                              NULL, NULL, &d, NULL, true);
 331
 332     chr_client = qemu_chr_new("client", tmp);
 333     qemu_chr_fe_init(&client_be, chr_client, &error_abort);
 334     qemu_chr_fe_set_handlers(&client_be, socket_can_read_hello,
 335                              socket_read_hello,
 336                              NULL, NULL, &d, NULL, true);
 337     g_free(tmp);
 338
 339     d.conn_expected = true;
 340     guint id = g_idle_add(char_socket_test_idle, &d);
 341     g_source_set_name_by_id(id, "test-idle");
 342     g_assert_cmpint(id, >, 0);
 343     main_loop();
 344
 345     g_assert(object_property_get_bool(OBJECT(chr), "connected", &error_abort));
 346     g_assert(object_property_get_bool(OBJECT(chr_client),
 347                                       "connected", &error_abort));
 348
 349     qemu_chr_write_all(chr_client, (const uint8_t *)"Z", 1);
 350     main_loop();
 351
 352     object_unparent(OBJECT(chr_client));
 353
 354     d.conn_expected = false;
 355     g_idle_add(char_socket_test_idle, &d);
 356     main_loop();
 357
 358     object_unparent(OBJECT(chr));
 359 }
 360
 361
 362 static void char_socket_basic_test(void)
 363 {
 364     Chardev *chr = qemu_chr_new("server", "tcp:127.0.0.1:0,server,nowait");
 365
 366     char_socket_test_common(chr);
 367 }
 368
 369
 370 static void char_socket_fdpass_test(void)
 371 {
 372     Chardev *chr;
 373     char *optstr;
 374     QemuOpts *opts;
 375     int fd;
 376     SocketAddress *addr = g_new0(SocketAddress, 1);
 377
 378     addr->type = SOCKET_ADDRESS_TYPE_INET;
 379     addr->u.inet.host = g_strdup("127.0.0.1");
 380     addr->u.inet.port = g_strdup("0");
 381
 382     fd = socket_listen(addr, &error_abort);
 383     g_assert(fd >= 0);
 384
 385     qapi_free_SocketAddress(addr);
 386
 387     optstr = g_strdup_printf("socket,id=cdev,fd=%d,server,nowait", fd);
 388
 389     opts = qemu_opts_parse_noisily(qemu_find_opts("chardev"),
 390                                    optstr, true);
 391     g_free(optstr);
 392     g_assert_nonnull(opts);
 393
 394     chr = qemu_chr_new_from_opts(opts, &error_abort);
 395
 396     qemu_opts_del(opts);
 397
 398     char_socket_test_common(chr);
 399 }
 400
 401
 402 #ifndef _WIN32
 403 static void char_pipe_test(void)
 404 {
 405     gchar *tmp_path = g_dir_make_tmp("qemu-test-char.XXXXXX", NULL);
 406     gchar *tmp, *in, *out, *pipe = g_build_filename(tmp_path, "pipe", NULL);
 407     Chardev *chr;
 408     CharBackend be;
 409     int ret, fd;
 410     char buf[10];
 411     FeHandler fe = { 0, };
 412
 413     in = g_strdup_printf("%s.in", pipe);
 414     if (mkfifo(in, 0600) < 0) {
 415         abort();
 416     }
 417     out = g_strdup_printf("%s.out", pipe);
 418     if (mkfifo(out, 0600) < 0) {
 419         abort();
 420     }
 421
 422     tmp = g_strdup_printf("pipe:%s", pipe);
 423     chr = qemu_chr_new("pipe", tmp);
 424     g_assert_nonnull(chr);
 425     g_free(tmp);
 426
 427     qemu_chr_fe_init(&be, chr, &error_abort);
 428
 429     ret = qemu_chr_fe_write(&be, (void *)"pipe-out", 9);
 430     g_assert_cmpint(ret, ==, 9);
 431
 432     fd = open(out, O_RDWR);
 433     ret = read(fd, buf, sizeof(buf));
 434     g_assert_cmpint(ret, ==, 9);
 435     g_assert_cmpstr(buf, ==, "pipe-out");
 436     close(fd);
 437
 438     fd = open(in, O_WRONLY);
 439     ret = write(fd, "pipe-in", 8);
 440     g_assert_cmpint(ret, ==, 8);
 441     close(fd);
 442
 443     qemu_chr_fe_set_handlers(&be,
 444                              fe_can_read,
 445                              fe_read,
 446                              fe_event,
 447                              NULL,
 448                              &fe,
 449                              NULL, true);
 450
 451     main_loop();
 452
 453     g_assert_cmpint(fe.read_count, ==, 8);
 454     g_assert_cmpstr(fe.read_buf, ==, "pipe-in");
 455
 456     qemu_chr_fe_deinit(&be, true);
 457
 458     g_assert(g_unlink(in) == 0);
 459     g_assert(g_unlink(out) == 0);
 460     g_assert(g_rmdir(tmp_path) == 0);
 461     g_free(in);
 462     g_free(out);
 463     g_free(tmp_path);
 464     g_free(pipe);
 465 }
 466 #endif
 467
 468 static int make_udp_socket(int *port)
 469 {
 470     struct sockaddr_in addr = { 0, };
 471     socklen_t alen = sizeof(addr);
 472     int ret, sock = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 473
 474     g_assert_cmpint(sock, >, 0);
 475     addr.sin_family = AF_INET ;
 476     addr.sin_addr.s_addr = htonl(INADDR_ANY);
 477     addr.sin_port = 0;
 478     ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
 479     g_assert_cmpint(ret, ==, 0);
 480     ret = getsockname(sock, (struct sockaddr *)&addr, &alen);
 481     g_assert_cmpint(ret, ==, 0);
 482
 483     *port = ntohs(addr.sin_port);
 484     return sock;
 485 }
 486
 487 static void char_udp_test_internal(Chardev *reuse_chr, int sock)
 488 {
 489     struct sockaddr_in other;
 490     SocketIdleData d = { 0, };
 491     Chardev *chr;
 492     CharBackend *be;
 493     socklen_t alen = sizeof(other);
 494     int ret;
 495     char buf[10];
 496     char *tmp = NULL;
 497
 498     if (reuse_chr) {
 499         chr = reuse_chr;
 500         be = chr->be;
 501     } else {
 502         int port;
 503         sock = make_udp_socket(&port);
 504         tmp = g_strdup_printf("udp:127.0.0.1:%d", port);
 505         chr = qemu_chr_new("client", tmp);
 506         g_assert_nonnull(chr);
 507
 508         be = g_alloca(sizeof(CharBackend));
 509         qemu_chr_fe_init(be, chr, &error_abort);
 510     }
 511
 512     d.chr = chr;
 513     qemu_chr_fe_set_handlers(be, socket_can_read_hello, socket_read_hello,
 514                              NULL, NULL, &d, NULL, true);
 515     ret = qemu_chr_write_all(chr, (uint8_t *)"hello", 5);
 516     g_assert_cmpint(ret, ==, 5);
 517
 518     ret = recvfrom(sock, buf, sizeof(buf), 0,
 519                    (struct sockaddr *)&other, &alen);
 520     g_assert_cmpint(ret, ==, 5);
 521     ret = sendto(sock, buf, 5, 0, (struct sockaddr *)&other, alen);
 522     g_assert_cmpint(ret, ==, 5);
 523
 524     main_loop();
 525
 526     if (!reuse_chr) {
 527         close(sock);
 528         qemu_chr_fe_deinit(be, true);
 529     }
 530     g_free(tmp);
 531 }
 532
 533 static void char_udp_test(void)
 534 {
 535     char_udp_test_internal(NULL, 0);
 536 }
 537
 538 #ifdef HAVE_CHARDEV_SERIAL
 539 static void char_serial_test(void)
 540 {
 541     QemuOpts *opts;
 542     Chardev *chr;
 543
 544     opts = qemu_opts_create(qemu_find_opts("chardev"), "serial-id",
 545                             1, &error_abort);
 546     qemu_opt_set(opts, "backend", "serial", &error_abort);
 547     qemu_opt_set(opts, "path", "/dev/null", &error_abort);
 548
 549     chr = qemu_chr_new_from_opts(opts, NULL);
 550     g_assert_nonnull(chr);
 551     /* TODO: add more tests with a pty */
 552     object_unparent(OBJECT(chr));
 553
 554     /* test tty alias */
 555     qemu_opt_set(opts, "backend", "tty", &error_abort);
 556     chr = qemu_chr_new_from_opts(opts, NULL);
 557     g_assert_nonnull(chr);
 558     object_unparent(OBJECT(chr));
 559
 560     qemu_opts_del(opts);
 561 }
 562 #endif
 563
 564 #ifndef _WIN32
 565 static void char_file_fifo_test(void)
 566 {
 567     Chardev *chr;
 568     CharBackend be;
 569     char *tmp_path = g_dir_make_tmp("qemu-test-char.XXXXXX", NULL);
 570     char *fifo = g_build_filename(tmp_path, "fifo", NULL);
 571     char *out = g_build_filename(tmp_path, "out", NULL);
 572     ChardevFile file = { .in = fifo,
 573                          .has_in = true,
 574                          .out = out };
 575     ChardevBackend backend = { .type = CHARDEV_BACKEND_KIND_FILE,
 576                                .u.file.data = &file };
 577     FeHandler fe = { 0, };
 578     int fd, ret;
 579
 580     if (mkfifo(fifo, 0600) < 0) {
 581         abort();
 582     }
 583
 584     fd = open(fifo, O_RDWR);
 585     ret = write(fd, "fifo-in", 8);
 586     g_assert_cmpint(ret, ==, 8);
 587
 588     chr = qemu_chardev_new("label-file", TYPE_CHARDEV_FILE, &backend,
 589                            &error_abort);
 590
 591     qemu_chr_fe_init(&be, chr, &error_abort);
 592     qemu_chr_fe_set_handlers(&be,
 593                              fe_can_read,
 594                              fe_read,
 595                              fe_event,
 596                              NULL,
 597                              &fe, NULL, true);
 598
 599     g_assert_cmpint(fe.last_event, !=, CHR_EVENT_BREAK);
 600     qmp_chardev_send_break("label-foo", NULL);
 601     g_assert_cmpint(fe.last_event, !=, CHR_EVENT_BREAK);
 602     qmp_chardev_send_break("label-file", NULL);
 603     g_assert_cmpint(fe.last_event, ==, CHR_EVENT_BREAK);
 604
 605     main_loop();
 606
 607     close(fd);
 608
 609     g_assert_cmpint(fe.read_count, ==, 8);
 610     g_assert_cmpstr(fe.read_buf, ==, "fifo-in");
 611
 612     qemu_chr_fe_deinit(&be, true);
 613
 614     g_unlink(fifo);
 615     g_free(fifo);
 616     g_unlink(out);
 617     g_free(out);
 618     g_rmdir(tmp_path);
 619     g_free(tmp_path);
 620 }
 621 #endif
 622
 623 static void char_file_test_internal(Chardev *ext_chr, const char *filepath)
 624 {
 625     char *tmp_path = g_dir_make_tmp("qemu-test-char.XXXXXX", NULL);
 626     char *out;
 627     Chardev *chr;
 628     char *contents = NULL;
 629     ChardevFile file = {};
 630     ChardevBackend backend = { .type = CHARDEV_BACKEND_KIND_FILE,
 631                                .u.file.data = &file };
 632     gsize length;
 633     int ret;
 634
 635     if (ext_chr) {
 636         chr = ext_chr;
 637         out = g_strdup(filepath);
 638         file.out = out;
 639     } else {
 640         out = g_build_filename(tmp_path, "out", NULL);
 641         file.out = out;
 642         chr = qemu_chardev_new(NULL, TYPE_CHARDEV_FILE, &backend,
 643                                &error_abort);
 644     }
 645     ret = qemu_chr_write_all(chr, (uint8_t *)"hello!", 6);
 646     g_assert_cmpint(ret, ==, 6);
 647
 648     ret = g_file_get_contents(out, &contents, &length, NULL);
 649     g_assert(ret == TRUE);
 650     g_assert_cmpint(length, ==, 6);
 651     g_assert(strncmp(contents, "hello!", 6) == 0);
 652
 653     if (!ext_chr) {
 654         object_unref(OBJECT(chr));
 655         g_unlink(out);
 656     }
 657     g_free(contents);
 658     g_rmdir(tmp_path);
 659     g_free(tmp_path);
 660     g_free(out);
 661 }
 662
 663 static void char_file_test(void)
 664 {
 665     char_file_test_internal(NULL, NULL);
 666 }
 667
 668 static void char_null_test(void)
 669 {
 670     Error *err = NULL;
 671     Chardev *chr;
 672     CharBackend be;
 673     int ret;
 674
 675     chr = qemu_chr_find("label-null");
 676     g_assert_null(chr);
 677
 678     chr = qemu_chr_new("label-null", "null");
 679     chr = qemu_chr_find("label-null");
 680     g_assert_nonnull(chr);
 681
 682     g_assert(qemu_chr_has_feature(chr,
 683                  QEMU_CHAR_FEATURE_FD_PASS) == false);
 684     g_assert(qemu_chr_has_feature(chr,
 685                  QEMU_CHAR_FEATURE_RECONNECTABLE) == false);
 686
 687     /* check max avail */
 688     qemu_chr_fe_init(&be, chr, &error_abort);
 689     qemu_chr_fe_init(&be, chr, &err);
 690     error_free_or_abort(&err);
 691
 692     /* deinit & reinit */
 693     qemu_chr_fe_deinit(&be, false);
 694     qemu_chr_fe_init(&be, chr, &error_abort);
 695
 696     qemu_chr_fe_set_open(&be, true);
 697
 698     qemu_chr_fe_set_handlers(&be,
 699                              fe_can_read,
 700                              fe_read,
 701                              fe_event,
 702                              NULL,
 703                              NULL, NULL, true);
 704
 705     ret = qemu_chr_fe_write(&be, (void *)"buf", 4);
 706     g_assert_cmpint(ret, ==, 4);
 707
 708     qemu_chr_fe_deinit(&be, true);
 709 }
 710
 711 static void char_invalid_test(void)
 712 {
 713     Chardev *chr;
 714
 715     chr = qemu_chr_new("label-invalid", "invalid");
 716     g_assert_null(chr);
 717 }
 718
 719 static int chardev_change(void *opaque)
 720 {
 721     return 0;
 722 }
 723
 724 static int chardev_change_denied(void *opaque)
 725 {
 726     return -1;
 727 }
 728
 729 static void char_hotswap_test(void)
 730 {
 731     char *chr_args;
 732     Chardev *chr;
 733     CharBackend be;
 734
 735     gchar *tmp_path = g_dir_make_tmp("qemu-test-char.XXXXXX", NULL);
 736     char *filename = g_build_filename(tmp_path, "file", NULL);
 737     ChardevFile file = { .out = filename };
 738     ChardevBackend backend = { .type = CHARDEV_BACKEND_KIND_FILE,
 739                                .u.file.data = &file };
 740     ChardevReturn *ret;
 741
 742     int port;
 743     int sock = make_udp_socket(&port);
 744     g_assert_cmpint(sock, >, 0);
 745
 746     chr_args = g_strdup_printf("udp:127.0.0.1:%d", port);
 747
 748     chr = qemu_chr_new("chardev", chr_args);
 749     qemu_chr_fe_init(&be, chr, &error_abort);
 750
 751     /* check that chardev operates correctly */
 752     char_udp_test_internal(chr, sock);
 753
 754     /* set the handler that denies the hotswap */
 755     qemu_chr_fe_set_handlers(&be, NULL, NULL,
 756                              NULL, chardev_change_denied, NULL, NULL, true);
 757
 758     /* now, change is denied and has to keep the old backend operating */
 759     ret = qmp_chardev_change("chardev", &backend, NULL);
 760     g_assert(!ret);
 761     g_assert(be.chr == chr);
 762
 763     char_udp_test_internal(chr, sock);
 764
 765     /* now allow the change */
 766     qemu_chr_fe_set_handlers(&be, NULL, NULL,
 767                              NULL, chardev_change, NULL, NULL, true);
 768
 769     /* has to succeed now */
 770     ret = qmp_chardev_change("chardev", &backend, &error_abort);
 771     g_assert(be.chr != chr);
 772
 773     close(sock);
 774     chr = be.chr;
 775
 776     /* run the file chardev test */
 777     char_file_test_internal(chr, filename);
 778
 779     object_unparent(OBJECT(chr));
 780
 781     qapi_free_ChardevReturn(ret);
 782     g_unlink(filename);
 783     g_free(filename);
 784     g_rmdir(tmp_path);
 785     g_free(tmp_path);
 786     g_free(chr_args);
 787 }
 788
 789 int main(int argc, char **argv)
 790 {
 791     qemu_init_main_loop(&error_abort);
 792     socket_init();
 793
 794     g_test_init(&argc, &argv, NULL);
 795
 796     module_call_init(MODULE_INIT_QOM);
 797     qemu_add_opts(&qemu_chardev_opts);
 798
 799     g_test_add_func("/char/null", char_null_test);
 800     g_test_add_func("/char/invalid", char_invalid_test);
 801     g_test_add_func("/char/ringbuf", char_ringbuf_test);
 802     g_test_add_func("/char/mux", char_mux_test);
 803 #ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
 804 #ifdef _WIN32
 805     g_test_add_func("/char/console/subprocess", char_console_test_subprocess);
 806     g_test_add_func("/char/console", char_console_test);
 807 #endif
 808     g_test_add_func("/char/stdio/subprocess", char_stdio_test_subprocess);
 809     g_test_add_func("/char/stdio", char_stdio_test);
 810 #endif
 811 #ifndef _WIN32
 812     g_test_add_func("/char/pipe", char_pipe_test);
 813 #endif
 814     g_test_add_func("/char/file", char_file_test);
 815 #ifndef _WIN32
 816     g_test_add_func("/char/file-fifo", char_file_fifo_test);
 817 #endif
 818     g_test_add_func("/char/socket/basic", char_socket_basic_test);
 819     g_test_add_func("/char/socket/fdpass", char_socket_fdpass_test);
 820     g_test_add_func("/char/udp", char_udp_test);
 821 #ifdef HAVE_CHARDEV_SERIAL
 822     g_test_add_func("/char/serial", char_serial_test);
 823 #endif
 824     g_test_add_func("/char/hotswap", char_hotswap_test);
 825
 826     return g_test_run();
 827 }