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