tests/libqtest.c

   1 /*
   2  * QTest
   3  *
   4  * Copyright IBM, Corp. 2012
   5  * Copyright Red Hat, Inc. 2012
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *  Paolo Bonzini     <pbonzini@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15 #include "libqtest.h"
  16
  17 #include <glib.h>
  18 #include <sys/types.h>
  19 #include <sys/socket.h>
  20 #include <sys/wait.h>
  21 #include <sys/un.h>
  22 #include <inttypes.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28
  29 #include "compiler.h"
  30 #include "osdep.h"
  31
  32 #define MAX_IRQ 256
  33
  34 QTestState *global_qtest;
  35
  36 struct QTestState
  37 {
  38     int fd;
  39     int qmp_fd;
  40     bool irq_level[MAX_IRQ];
  41     GString *rx;
  42     gchar *pid_file;
  43 };
  44
  45 #define g_assert_no_errno(ret) do { \
  46     g_assert_cmpint(ret, !=, -1); \
  47 } while (0)
  48
  49 static int init_socket(const char *socket_path)
  50 {
  51     struct sockaddr_un addr;
  52     int sock;
  53     int ret;
  54
  55     sock = socket(PF_UNIX, SOCK_STREAM, 0);
  56     g_assert_no_errno(sock);
  57
  58     addr.sun_family = AF_UNIX;
  59     snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", socket_path);
  60     qemu_set_cloexec(sock);
  61
  62     do {
  63         ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
  64     } while (ret == -1 && errno == EINTR);
  65     g_assert_no_errno(ret);
  66     listen(sock, 1);
  67
  68     return sock;
  69 }
  70
  71 static int socket_accept(int sock)
  72 {
  73     struct sockaddr_un addr;
  74     socklen_t addrlen;
  75     int ret;
  76
  77     do {
  78         ret = accept(sock, (struct sockaddr *)&addr, &addrlen);
  79     } while (ret == -1 && errno == EINTR);
  80     g_assert_no_errno(ret);
  81     close(sock);
  82
  83     return ret;
  84 }
  85
  86 QTestState *qtest_init(const char *extra_args)
  87 {
  88     QTestState *s;
  89     int sock, qmpsock, ret, i;
  90     gchar *socket_path;
  91     gchar *qmp_socket_path;
  92     gchar *pid_file;
  93     gchar *command;
  94     const char *qemu_binary;
  95     pid_t pid;
  96
  97     qemu_binary = getenv("QTEST_QEMU_BINARY");
  98     g_assert(qemu_binary != NULL);
  99
 100     socket_path = g_strdup_printf("/tmp/qtest-%d.sock", getpid());
 101     qmp_socket_path = g_strdup_printf("/tmp/qtest-%d.qmp", getpid());
 102     pid_file = g_strdup_printf("/tmp/qtest-%d.pid", getpid());
 103
 104     s = g_malloc(sizeof(*s));
 105
 106     sock = init_socket(socket_path);
 107     qmpsock = init_socket(qmp_socket_path);
 108
 109     pid = fork();
 110     if (pid == 0) {
 111         command = g_strdup_printf("%s "
 112                                   "-qtest unix:%s,nowait "
 113                                   "-qtest-log /dev/null "
 114                                   "-qmp unix:%s,nowait "
 115                                   "-pidfile %s "
 116                                   "-machine accel=qtest "
 117                                   "%s", qemu_binary, socket_path,
 118                                   qmp_socket_path, pid_file,
 119                                   extra_args ?: "");
 120
 121         ret = system(command);
 122         exit(ret);
 123         g_free(command);
 124     }
 125
 126     s->fd = socket_accept(sock);
 127     s->qmp_fd = socket_accept(qmpsock);
 128
 129     s->rx = g_string_new("");
 130     s->pid_file = pid_file;
 131     for (i = 0; i < MAX_IRQ; i++) {
 132         s->irq_level[i] = false;
 133     }
 134
 135     g_free(socket_path);
 136     g_free(qmp_socket_path);
 137
 138     /* Read the QMP greeting and then do the handshake */
 139     qtest_qmp(s, "");
 140     qtest_qmp(s, "{ 'execute': 'qmp_capabilities' }");
 141
 142     return s;
 143 }
 144
 145 void qtest_quit(QTestState *s)
 146 {
 147     FILE *f;
 148     char buffer[1024];
 149
 150     f = fopen(s->pid_file, "r");
 151     if (f) {
 152         if (fgets(buffer, sizeof(buffer), f)) {
 153             pid_t pid = atoi(buffer);
 154             int status = 0;
 155
 156             kill(pid, SIGTERM);
 157             waitpid(pid, &status, 0);
 158         }
 159
 160         fclose(f);
 161     }
 162 }
 163
 164 static void socket_sendf(int fd, const char *fmt, va_list ap)
 165 {
 166     gchar *str;
 167     size_t size, offset;
 168
 169     str = g_strdup_vprintf(fmt, ap);
 170     size = strlen(str);
 171
 172     offset = 0;
 173     while (offset < size) {
 174         ssize_t len;
 175
 176         len = write(fd, str + offset, size - offset);
 177         if (len == -1 && errno == EINTR) {
 178             continue;
 179         }
 180
 181         g_assert_no_errno(len);
 182         g_assert_cmpint(len, >, 0);
 183
 184         offset += len;
 185     }
 186 }
 187
 188 static void GCC_FMT_ATTR(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)
 189 {
 190     va_list ap;
 191
 192     va_start(ap, fmt);
 193     socket_sendf(s->fd, fmt, ap);
 194     va_end(ap);
 195 }
 196
 197 static GString *qtest_recv_line(QTestState *s)
 198 {
 199     GString *line;
 200     size_t offset;
 201     char *eol;
 202
 203     while ((eol = strchr(s->rx->str, '\n')) == NULL) {
 204         ssize_t len;
 205         char buffer[1024];
 206
 207         len = read(s->fd, buffer, sizeof(buffer));
 208         if (len == -1 && errno == EINTR) {
 209             continue;
 210         }
 211
 212         if (len == -1 || len == 0) {
 213             fprintf(stderr, "Broken pipe\n");
 214             exit(1);
 215         }
 216
 217         g_string_append_len(s->rx, buffer, len);
 218     }
 219
 220     offset = eol - s->rx->str;
 221     line = g_string_new_len(s->rx->str, offset);
 222     g_string_erase(s->rx, 0, offset + 1);
 223
 224     return line;
 225 }
 226
 227 static gchar **qtest_rsp(QTestState *s, int expected_args)
 228 {
 229     GString *line;
 230     gchar **words;
 231     int i;
 232
 233 redo:
 234     line = qtest_recv_line(s);
 235     words = g_strsplit(line->str, " ", 0);
 236     g_string_free(line, TRUE);
 237
 238     if (strcmp(words[0], "IRQ") == 0) {
 239         int irq;
 240
 241         g_assert(words[1] != NULL);
 242         g_assert(words[2] != NULL);
 243
 244         irq = strtoul(words[2], NULL, 0);
 245         g_assert_cmpint(irq, >=, 0);
 246         g_assert_cmpint(irq, <, MAX_IRQ);
 247
 248         if (strcmp(words[1], "raise") == 0) {
 249             s->irq_level[irq] = true;
 250         } else {
 251             s->irq_level[irq] = false;
 252         }
 253
 254         g_strfreev(words);
 255         goto redo;
 256     }
 257
 258     g_assert(words[0] != NULL);
 259     g_assert_cmpstr(words[0], ==, "OK");
 260
 261     if (expected_args) {
 262         for (i = 0; i < expected_args; i++) {
 263             g_assert(words[i] != NULL);
 264         }
 265     } else {
 266         g_strfreev(words);
 267     }
 268
 269     return words;
 270 }
 271
 272 void qtest_qmp(QTestState *s, const char *fmt, ...)
 273 {
 274     va_list ap;
 275     bool has_reply = false;
 276     int nesting = 0;
 277
 278     /* Send QMP request */
 279     va_start(ap, fmt);
 280     socket_sendf(s->qmp_fd, fmt, ap);
 281     va_end(ap);
 282
 283     /* Receive reply */
 284     while (!has_reply || nesting > 0) {
 285         ssize_t len;
 286         char c;
 287
 288         len = read(s->qmp_fd, &c, 1);
 289         if (len == -1 && errno == EINTR) {
 290             continue;
 291         }
 292
 293         switch (c) {
 294         case '{':
 295             nesting++;
 296             has_reply = true;
 297             break;
 298         case '}':
 299             nesting--;
 300             break;
 301         }
 302     }
 303 }
 304
 305 const char *qtest_get_arch(void)
 306 {
 307     const char *qemu = getenv("QTEST_QEMU_BINARY");
 308     const char *end = strrchr(qemu, '/');
 309
 310     return end + strlen("/qemu-system-");
 311 }
 312
 313 bool qtest_get_irq(QTestState *s, int num)
 314 {
 315     /* dummy operation in order to make sure irq is up to date */
 316     qtest_inb(s, 0);
 317
 318     return s->irq_level[num];
 319 }
 320
 321 static int64_t qtest_clock_rsp(QTestState *s)
 322 {
 323     gchar **words;
 324     int64_t clock;
 325     words = qtest_rsp(s, 2);
 326     clock = g_ascii_strtoll(words[1], NULL, 0);
 327     g_strfreev(words);
 328     return clock;
 329 }
 330
 331 int64_t qtest_clock_step_next(QTestState *s)
 332 {
 333     qtest_sendf(s, "clock_step\n");
 334     return qtest_clock_rsp(s);
 335 }
 336
 337 int64_t qtest_clock_step(QTestState *s, int64_t step)
 338 {
 339     qtest_sendf(s, "clock_step %"PRIi64"\n", step);
 340     return qtest_clock_rsp(s);
 341 }
 342
 343 int64_t qtest_clock_set(QTestState *s, int64_t val)
 344 {
 345     qtest_sendf(s, "clock_set %"PRIi64"\n", val);
 346     return qtest_clock_rsp(s);
 347 }
 348
 349 void qtest_irq_intercept_out(QTestState *s, const char *qom_path)
 350 {
 351     qtest_sendf(s, "irq_intercept_out %s\n", qom_path);
 352     qtest_rsp(s, 0);
 353 }
 354
 355 void qtest_irq_intercept_in(QTestState *s, const char *qom_path)
 356 {
 357     qtest_sendf(s, "irq_intercept_in %s\n", qom_path);
 358     qtest_rsp(s, 0);
 359 }
 360
 361 static void qtest_out(QTestState *s, const char *cmd, uint16_t addr, uint32_t value)
 362 {
 363     qtest_sendf(s, "%s 0x%x 0x%x\n", cmd, addr, value);
 364     qtest_rsp(s, 0);
 365 }
 366
 367 void qtest_outb(QTestState *s, uint16_t addr, uint8_t value)
 368 {
 369     qtest_out(s, "outb", addr, value);
 370 }
 371
 372 void qtest_outw(QTestState *s, uint16_t addr, uint16_t value)
 373 {
 374     qtest_out(s, "outw", addr, value);
 375 }
 376
 377 void qtest_outl(QTestState *s, uint16_t addr, uint32_t value)
 378 {
 379     qtest_out(s, "outl", addr, value);
 380 }
 381
 382 static uint32_t qtest_in(QTestState *s, const char *cmd, uint16_t addr)
 383 {
 384     gchar **args;
 385     uint32_t value;
 386
 387     qtest_sendf(s, "%s 0x%x\n", cmd, addr);
 388     args = qtest_rsp(s, 2);
 389     value = strtoul(args[1], NULL, 0);
 390     g_strfreev(args);
 391
 392     return value;
 393 }
 394
 395 uint8_t qtest_inb(QTestState *s, uint16_t addr)
 396 {
 397     return qtest_in(s, "inb", addr);
 398 }
 399
 400 uint16_t qtest_inw(QTestState *s, uint16_t addr)
 401 {
 402     return qtest_in(s, "inw", addr);
 403 }
 404
 405 uint32_t qtest_inl(QTestState *s, uint16_t addr)
 406 {
 407     return qtest_in(s, "inl", addr);
 408 }
 409
 410 static int hex2nib(char ch)
 411 {
 412     if (ch >= '0' && ch <= '9') {
 413         return ch - '0';
 414     } else if (ch >= 'a' && ch <= 'f') {
 415         return 10 + (ch - 'a');
 416     } else if (ch >= 'A' && ch <= 'F') {
 417         return 10 + (ch - 'a');
 418     } else {
 419         return -1;
 420     }
 421 }
 422
 423 void qtest_memread(QTestState *s, uint64_t addr, void *data, size_t size)
 424 {
 425     uint8_t *ptr = data;
 426     gchar **args;
 427     size_t i;
 428
 429     qtest_sendf(s, "read 0x%" PRIx64 " 0x%zx\n", addr, size);
 430     args = qtest_rsp(s, 2);
 431
 432     for (i = 0; i < size; i++) {
 433         ptr[i] = hex2nib(args[1][2 + (i * 2)]) << 4;
 434         ptr[i] |= hex2nib(args[1][2 + (i * 2) + 1]);
 435     }
 436
 437     g_strfreev(args);
 438 }
 439
 440 void qtest_add_func(const char *str, void (*fn))
 441 {
 442     gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
 443     g_test_add_func(path, fn);
 444 }
 445
 446 void qtest_memwrite(QTestState *s, uint64_t addr, const void *data, size_t size)
 447 {
 448     const uint8_t *ptr = data;
 449     size_t i;
 450
 451     qtest_sendf(s, "write 0x%" PRIx64 " 0x%zx 0x", addr, size);
 452     for (i = 0; i < size; i++) {
 453         qtest_sendf(s, "%02x", ptr[i]);
 454     }
 455     qtest_sendf(s, "\n");
 456     qtest_rsp(s, 0);
 457 }