| 1 | #include <stdio.h> |
| 2 | #include <stdint.h> |
| 3 | #include <signal.h> |
| 4 | #include <sys/types.h> |
| 5 | #include <sys/socket.h> |
| 6 | #include <sys/un.h> |
| 7 | #include <sched.h> |
| 8 | #include <fcntl.h> |
| 9 | |
| 10 | #include "marker.h" |
| 11 | #include "tracer.h" |
| 12 | #include "usterr.h" |
| 13 | |
| 14 | #define UNIX_PATH_MAX 108 |
| 15 | |
| 16 | //#define SOCKETDIR "/var/run/ust/socks" |
| 17 | #define SOCKETDIR "/tmp/socks" |
| 18 | #define SOCKETDIRLEN sizeof(SOCKETDIR) |
| 19 | #define USTSIGNAL SIGIO |
| 20 | |
| 21 | #define DBG(fmt, args...) fprintf(stderr, fmt "\n", ## args) |
| 22 | #define WARN(fmt, args...) fprintf(stderr, "usertrace: WARNING: " fmt "\n", ## args) |
| 23 | #define ERR(fmt, args...) fprintf(stderr, "usertrace: ERROR: " fmt "\n", ## args); fflush(stderr) |
| 24 | #define PERROR(call) perror("usertrace: ERROR: " call) |
| 25 | |
| 26 | #define MAX_MSG_SIZE (100) |
| 27 | #define MSG_NOTIF 1 |
| 28 | #define MSG_REGISTER_NOTIF 2 |
| 29 | |
| 30 | char consumer_stack[10000]; |
| 31 | |
| 32 | struct tracecmd { /* no padding */ |
| 33 | uint32_t size; |
| 34 | uint16_t command; |
| 35 | }; |
| 36 | |
| 37 | //struct listener_arg { |
| 38 | // int pipe_fd; |
| 39 | //}; |
| 40 | |
| 41 | struct trctl_msg { |
| 42 | /* size: the size of all the fields except size itself */ |
| 43 | uint32_t size; |
| 44 | uint16_t type; |
| 45 | /* Only the necessary part of the payload is transferred. It |
| 46 | * may even be none of it. |
| 47 | */ |
| 48 | char payload[94]; |
| 49 | }; |
| 50 | |
| 51 | pid_t mypid; |
| 52 | char mysocketfile[UNIX_PATH_MAX] = ""; |
| 53 | int pfd = -1; |
| 54 | |
| 55 | struct consumer_channel { |
| 56 | int fd; |
| 57 | struct ltt_channel_struct *chan; |
| 58 | }; |
| 59 | |
| 60 | int consumer(void *arg) |
| 61 | { |
| 62 | int result; |
| 63 | int fd; |
| 64 | char str[] = "Hello, this is the consumer.\n"; |
| 65 | struct ltt_trace_struct *trace; |
| 66 | struct consumer_channel *consumer_channels; |
| 67 | int i; |
| 68 | char trace_name[] = "auto"; |
| 69 | |
| 70 | ltt_lock_traces(); |
| 71 | trace = _ltt_trace_find(trace_name); |
| 72 | ltt_unlock_traces(); |
| 73 | |
| 74 | if(trace == NULL) { |
| 75 | CPRINTF("cannot find trace!"); |
| 76 | return 1; |
| 77 | } |
| 78 | |
| 79 | consumer_channels = (struct consumer_channel *) malloc(trace->nr_channels * sizeof(struct consumer_channel)); |
| 80 | if(consumer_channels == NULL) { |
| 81 | ERR("malloc returned NULL"); |
| 82 | return 1; |
| 83 | } |
| 84 | |
| 85 | CPRINTF("opening trace files"); |
| 86 | for(i=0; i<trace->nr_channels; i++) { |
| 87 | char tmp[100]; |
| 88 | struct ltt_channel_struct *chan = &trace->channels[i]; |
| 89 | |
| 90 | consumer_channels[i].chan = chan; |
| 91 | |
| 92 | snprintf(tmp, sizeof(tmp), "trace/%s", chan->channel_name); |
| 93 | result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00644); |
| 94 | if(result == -1) { |
| 95 | perror("open"); |
| 96 | return -1; |
| 97 | } |
| 98 | CPRINTF("\topened trace file %s", tmp); |
| 99 | |
| 100 | } |
| 101 | CPRINTF("done opening trace files"); |
| 102 | |
| 103 | for(;;) { |
| 104 | /*wait*/ |
| 105 | |
| 106 | for(i=0; i<trace->nr_channels; i++) { |
| 107 | struct rchan *rchan = consumer_channels[i].chan->trans_channel_data; |
| 108 | struct rchan_buf *rbuf = rchan->buf; |
| 109 | struct ltt_channel_buf_struct *lttbuf = consumer_channels[i].chan->buf; |
| 110 | long consumed_old; |
| 111 | |
| 112 | result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); |
| 113 | if(result < 0) { |
| 114 | CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result)); |
| 115 | } |
| 116 | else { |
| 117 | CPRINTF("success!"); |
| 118 | |
| 119 | result = write(consumer_channels[i].fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096); |
| 120 | ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | sleep(1); |
| 125 | } |
| 126 | |
| 127 | // CPRINTF("consumer: got a trace: %s with %d channels\n", trace_name, trace->nr_channels); |
| 128 | // |
| 129 | // struct ltt_channel_struct *chan = &trace->channels[0]; |
| 130 | // |
| 131 | // CPRINTF("channel 1 (%s) active=%u", chan->channel_name, chan->active & 1); |
| 132 | |
| 133 | // struct rchan *rchan = chan->trans_channel_data; |
| 134 | // struct rchan_buf *rbuf = rchan->buf; |
| 135 | // struct ltt_channel_buf_struct *lttbuf = chan->buf; |
| 136 | // long consumed_old; |
| 137 | // |
| 138 | // result = fd = open("trace.out", O_WRONLY | O_CREAT | O_TRUNC, 00644); |
| 139 | // if(result == -1) { |
| 140 | // perror("open"); |
| 141 | // return -1; |
| 142 | // } |
| 143 | |
| 144 | // for(;;) { |
| 145 | // write(STDOUT_FILENO, str, sizeof(str)); |
| 146 | // |
| 147 | // result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); |
| 148 | // if(result < 0) { |
| 149 | // CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result)); |
| 150 | // } |
| 151 | // else { |
| 152 | // CPRINTF("success!"); |
| 153 | // |
| 154 | // result = write(fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096); |
| 155 | // ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); |
| 156 | // } |
| 157 | // |
| 158 | // //CPRINTF("There seems to be %ld bytes available", SUBBUF_TRUNC(local_read(<tbuf->offset), rbuf->chan) - consumed_old); |
| 159 | // CPRINTF("Commit count %ld", local_read(<tbuf->commit_count[0])); |
| 160 | // |
| 161 | // |
| 162 | // sleep(1); |
| 163 | // } |
| 164 | } |
| 165 | |
| 166 | void start_consumer(void) |
| 167 | { |
| 168 | int result; |
| 169 | |
| 170 | result = clone(consumer, consumer_stack+sizeof(consumer_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
| 171 | if(result == -1) { |
| 172 | perror("clone"); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | static void print_markers(void) |
| 177 | { |
| 178 | struct marker_iter iter; |
| 179 | |
| 180 | marker_iter_reset(&iter); |
| 181 | marker_iter_start(&iter); |
| 182 | |
| 183 | while(iter.marker) { |
| 184 | fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format); |
| 185 | marker_iter_next(&iter); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | void do_command(struct tracecmd *cmd) |
| 190 | { |
| 191 | } |
| 192 | |
| 193 | void receive_commands() |
| 194 | { |
| 195 | } |
| 196 | |
| 197 | int fd_notif = -1; |
| 198 | void notif_cb(void) |
| 199 | { |
| 200 | int result; |
| 201 | struct trctl_msg msg; |
| 202 | |
| 203 | /* FIXME: fd_notif should probably be protected by a spinlock */ |
| 204 | |
| 205 | if(fd_notif == -1) |
| 206 | return; |
| 207 | |
| 208 | msg.type = MSG_NOTIF; |
| 209 | msg.size = sizeof(msg.type); |
| 210 | |
| 211 | /* FIXME: don't block here */ |
| 212 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); |
| 213 | if(result == -1) { |
| 214 | PERROR("write"); |
| 215 | return; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | char recvbuf[10000]; |
| 220 | |
| 221 | int listener_main(void *p) |
| 222 | { |
| 223 | int result; |
| 224 | |
| 225 | for(;;) { |
| 226 | uint32_t size; |
| 227 | struct sockaddr_un addr; |
| 228 | socklen_t addrlen = sizeof(addr); |
| 229 | char trace_name[] = "auto"; |
| 230 | char trace_type[] = "ustrelay"; |
| 231 | |
| 232 | for(;;) { |
| 233 | struct trctl_msg msg; |
| 234 | int len; |
| 235 | |
| 236 | result = len = recvfrom(pfd, recvbuf, sizeof(recvbuf), 0, &addr, &addrlen); |
| 237 | if(result == -1) { |
| 238 | PERROR("recvfrom"); |
| 239 | continue; |
| 240 | } |
| 241 | |
| 242 | if(recvbuf[len-1] == '\n') |
| 243 | recvbuf[len-1] = '\0'; |
| 244 | |
| 245 | fprintf(stderr, "received a message! it's: %s\n", recvbuf); |
| 246 | |
| 247 | |
| 248 | if(!strcmp(recvbuf, "print_markers")) { |
| 249 | print_markers(); |
| 250 | } |
| 251 | else if(!strcmp(recvbuf, "trace_setup")) { |
| 252 | DBG("trace setup"); |
| 253 | |
| 254 | result = ltt_trace_setup(trace_name); |
| 255 | if(result < 0) { |
| 256 | ERR("ltt_trace_setup failed"); |
| 257 | return; |
| 258 | } |
| 259 | |
| 260 | result = ltt_trace_set_type(trace_name, trace_type); |
| 261 | if(result < 0) { |
| 262 | ERR("ltt_trace_set_type failed"); |
| 263 | return; |
| 264 | } |
| 265 | } |
| 266 | else if(!strcmp(recvbuf, "trace_alloc")) { |
| 267 | DBG("trace alloc"); |
| 268 | |
| 269 | result = ltt_trace_alloc(trace_name); |
| 270 | if(result < 0) { |
| 271 | ERR("ltt_trace_alloc failed"); |
| 272 | return; |
| 273 | } |
| 274 | } |
| 275 | else if(!strcmp(recvbuf, "trace_start")) { |
| 276 | DBG("trace start"); |
| 277 | |
| 278 | result = ltt_trace_start(trace_name); |
| 279 | if(result < 0) { |
| 280 | ERR("ltt_trace_start failed"); |
| 281 | return; |
| 282 | } |
| 283 | } |
| 284 | else if(!strcmp(recvbuf, "trace_stop")) { |
| 285 | DBG("trace stop"); |
| 286 | |
| 287 | result = ltt_trace_stop(trace_name); |
| 288 | if(result < 0) { |
| 289 | ERR("ltt_trace_stop failed"); |
| 290 | return; |
| 291 | } |
| 292 | } |
| 293 | else if(!strcmp(recvbuf, "trace_destroy")) { |
| 294 | |
| 295 | DBG("trace destroy"); |
| 296 | |
| 297 | result = ltt_trace_destroy(trace_name); |
| 298 | if(result < 0) { |
| 299 | ERR("ltt_trace_destroy failed"); |
| 300 | return; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | next_conn:; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | void create_listener(void) |
| 309 | { |
| 310 | int result; |
| 311 | static char listener_stack[16384]; |
| 312 | |
| 313 | result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
| 314 | if(result == -1) { |
| 315 | perror("clone"); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* The signal handler itself. */ |
| 320 | |
| 321 | void sighandler(int sig) |
| 322 | { |
| 323 | DBG("sighandler"); |
| 324 | create_listener(); |
| 325 | } |
| 326 | |
| 327 | /* Called by the app signal handler to chain it to us. */ |
| 328 | |
| 329 | void chain_signal(void) |
| 330 | { |
| 331 | sighandler(USTSIGNAL); |
| 332 | } |
| 333 | |
| 334 | static int init_socket(void) |
| 335 | { |
| 336 | int result; |
| 337 | int fd; |
| 338 | char pidstr[6]; |
| 339 | int pidlen; |
| 340 | |
| 341 | struct sockaddr_un addr; |
| 342 | |
| 343 | result = fd = socket(PF_UNIX, SOCK_DGRAM, 0); |
| 344 | if(result == -1) { |
| 345 | PERROR("socket"); |
| 346 | return -1; |
| 347 | } |
| 348 | |
| 349 | addr.sun_family = AF_UNIX; |
| 350 | |
| 351 | result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s/%d", SOCKETDIR, mypid); |
| 352 | if(result >= UNIX_PATH_MAX) { |
| 353 | ERR("string overflow allocating socket name"); |
| 354 | goto close_sock; |
| 355 | } |
| 356 | //DBG("opening socket at %s", addr.sun_path); |
| 357 | |
| 358 | result = bind(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 359 | if(result == -1) { |
| 360 | PERROR("bind"); |
| 361 | goto close_sock; |
| 362 | } |
| 363 | |
| 364 | strcpy(mysocketfile, addr.sun_path); |
| 365 | |
| 366 | pfd = fd; |
| 367 | return 0; |
| 368 | |
| 369 | close_sock: |
| 370 | close(fd); |
| 371 | |
| 372 | return -1; |
| 373 | } |
| 374 | |
| 375 | static void destroy_socket(void) |
| 376 | { |
| 377 | int result; |
| 378 | |
| 379 | if(mysocketfile[0] == '\0') |
| 380 | return; |
| 381 | |
| 382 | result = unlink(mysocketfile); |
| 383 | if(result == -1) { |
| 384 | PERROR("unlink"); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | static int init_signal_handler(void) |
| 389 | { |
| 390 | /* Attempt to handler SIGIO. If the main program wants to |
| 391 | * handle it, fine, it'll override us. They it'll have to |
| 392 | * use the chaining function. |
| 393 | */ |
| 394 | |
| 395 | int result; |
| 396 | struct sigaction act; |
| 397 | |
| 398 | result = sigemptyset(&act.sa_mask); |
| 399 | if(result == -1) { |
| 400 | PERROR("sigemptyset"); |
| 401 | return -1; |
| 402 | } |
| 403 | |
| 404 | act.sa_handler = sighandler; |
| 405 | act.sa_flags = SA_RESTART; |
| 406 | |
| 407 | /* Only defer ourselves. Also, try to restart interrupted |
| 408 | * syscalls to disturb the traced program as little as possible. |
| 409 | */ |
| 410 | result = sigaction(SIGIO, &act, NULL); |
| 411 | if(result == -1) { |
| 412 | PERROR("sigaction"); |
| 413 | return -1; |
| 414 | } |
| 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | static void auto_probe_connect(struct marker *m) |
| 420 | { |
| 421 | int result; |
| 422 | |
| 423 | result = ltt_marker_connect(m->channel, m->name, "default"); |
| 424 | if(result) |
| 425 | ERR("ltt_marker_connect"); |
| 426 | |
| 427 | DBG("just auto connected marker %s %s to probe default", m->channel, m->name); |
| 428 | } |
| 429 | |
| 430 | static void __attribute__((constructor(101))) init0() |
| 431 | { |
| 432 | DBG("UST_AUTOPROBE constructor"); |
| 433 | if(getenv("UST_AUTOPROBE")) { |
| 434 | marker_set_new_marker_cb(auto_probe_connect); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static void fini(void); |
| 439 | |
| 440 | static void __attribute__((constructor(1000))) init() |
| 441 | { |
| 442 | int result; |
| 443 | |
| 444 | DBG("UST_TRACE constructor"); |
| 445 | |
| 446 | mypid = getpid(); |
| 447 | |
| 448 | if(getenv("UST_TRACE")) { |
| 449 | char trace_name[] = "auto"; |
| 450 | char trace_type[] = "ustrelay"; |
| 451 | |
| 452 | DBG("starting early tracing"); |
| 453 | |
| 454 | /* Ensure marker control is initialized */ |
| 455 | init_marker_control(); |
| 456 | |
| 457 | /* Ensure relay is initialized */ |
| 458 | init_ustrelay_transport(); |
| 459 | |
| 460 | /* Ensure markers are initialized */ |
| 461 | init_markers(); |
| 462 | |
| 463 | /* In case. */ |
| 464 | ltt_channels_register("ust"); |
| 465 | |
| 466 | result = ltt_trace_setup(trace_name); |
| 467 | if(result < 0) { |
| 468 | ERR("ltt_trace_setup failed"); |
| 469 | return; |
| 470 | } |
| 471 | |
| 472 | result = ltt_trace_set_type(trace_name, trace_type); |
| 473 | if(result < 0) { |
| 474 | ERR("ltt_trace_set_type failed"); |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | result = ltt_trace_alloc(trace_name); |
| 479 | if(result < 0) { |
| 480 | ERR("ltt_trace_alloc failed"); |
| 481 | return; |
| 482 | } |
| 483 | |
| 484 | result = ltt_trace_start(trace_name); |
| 485 | if(result < 0) { |
| 486 | ERR("ltt_trace_start failed"); |
| 487 | return; |
| 488 | } |
| 489 | start_consumer(); |
| 490 | } |
| 491 | |
| 492 | /* Must create socket before signal handler to prevent races |
| 493 | * on pfd variable. |
| 494 | */ |
| 495 | result = init_socket(); |
| 496 | if(result == -1) { |
| 497 | ERR("init_socket error"); |
| 498 | return; |
| 499 | } |
| 500 | result = init_signal_handler(); |
| 501 | if(result == -1) { |
| 502 | ERR("init_signal_handler error"); |
| 503 | return; |
| 504 | } |
| 505 | |
| 506 | return; |
| 507 | |
| 508 | /* should decrementally destroy stuff if error */ |
| 509 | |
| 510 | } |
| 511 | |
| 512 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 513 | * so we cannot rely on it. */ |
| 514 | |
| 515 | static void __attribute__((destructor)) fini() |
| 516 | { |
| 517 | int result; |
| 518 | |
| 519 | /* if trace running, finish it */ |
| 520 | |
| 521 | DBG("destructor stopping traces"); |
| 522 | |
| 523 | result = ltt_trace_stop("auto"); |
| 524 | if(result == -1) { |
| 525 | ERR("ltt_trace_stop error"); |
| 526 | } |
| 527 | |
| 528 | result = ltt_trace_destroy("auto"); |
| 529 | if(result == -1) { |
| 530 | ERR("ltt_trace_destroy error"); |
| 531 | } |
| 532 | |
| 533 | /* FIXME: wait for the consumer to be done */ |
| 534 | sleep(10); |
| 535 | |
| 536 | destroy_socket(); |
| 537 | } |