| 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 "localerr.h" |
| 13 | #include "ustcomm.h" |
| 14 | #include "relay.h" /* FIXME: remove */ |
| 15 | |
| 16 | //#define USE_CLONE |
| 17 | |
| 18 | #define USTSIGNAL SIGIO |
| 19 | |
| 20 | #define MAX_MSG_SIZE (100) |
| 21 | #define MSG_NOTIF 1 |
| 22 | #define MSG_REGISTER_NOTIF 2 |
| 23 | |
| 24 | char consumer_stack[10000]; |
| 25 | |
| 26 | static struct ustcomm_app ustcomm_app; |
| 27 | |
| 28 | struct tracecmd { /* no padding */ |
| 29 | uint32_t size; |
| 30 | uint16_t command; |
| 31 | }; |
| 32 | |
| 33 | //struct listener_arg { |
| 34 | // int pipe_fd; |
| 35 | //}; |
| 36 | |
| 37 | struct trctl_msg { |
| 38 | /* size: the size of all the fields except size itself */ |
| 39 | uint32_t size; |
| 40 | uint16_t type; |
| 41 | /* Only the necessary part of the payload is transferred. It |
| 42 | * may even be none of it. |
| 43 | */ |
| 44 | char payload[94]; |
| 45 | }; |
| 46 | |
| 47 | struct consumer_channel { |
| 48 | int fd; |
| 49 | struct ltt_channel_struct *chan; |
| 50 | }; |
| 51 | |
| 52 | int consumer(void *arg) |
| 53 | { |
| 54 | int result; |
| 55 | int fd; |
| 56 | char str[] = "Hello, this is the consumer.\n"; |
| 57 | struct ltt_trace_struct *trace; |
| 58 | struct consumer_channel *consumer_channels; |
| 59 | int i; |
| 60 | char trace_name[] = "auto"; |
| 61 | |
| 62 | ltt_lock_traces(); |
| 63 | trace = _ltt_trace_find(trace_name); |
| 64 | ltt_unlock_traces(); |
| 65 | |
| 66 | if(trace == NULL) { |
| 67 | CPRINTF("cannot find trace!"); |
| 68 | return 1; |
| 69 | } |
| 70 | |
| 71 | consumer_channels = (struct consumer_channel *) malloc(trace->nr_channels * sizeof(struct consumer_channel)); |
| 72 | if(consumer_channels == NULL) { |
| 73 | ERR("malloc returned NULL"); |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | CPRINTF("opening trace files"); |
| 78 | for(i=0; i<trace->nr_channels; i++) { |
| 79 | char tmp[100]; |
| 80 | struct ltt_channel_struct *chan = &trace->channels[i]; |
| 81 | |
| 82 | consumer_channels[i].chan = chan; |
| 83 | |
| 84 | snprintf(tmp, sizeof(tmp), "trace/%s_0", chan->channel_name); |
| 85 | result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600); |
| 86 | if(result == -1) { |
| 87 | perror("open"); |
| 88 | return -1; |
| 89 | } |
| 90 | CPRINTF("\topened trace file %s", tmp); |
| 91 | |
| 92 | } |
| 93 | CPRINTF("done opening trace files"); |
| 94 | |
| 95 | for(;;) { |
| 96 | /*wait*/ |
| 97 | |
| 98 | for(i=0; i<trace->nr_channels; i++) { |
| 99 | struct rchan *rchan = consumer_channels[i].chan->trans_channel_data; |
| 100 | struct rchan_buf *rbuf = rchan->buf; |
| 101 | struct ltt_channel_buf_struct *lttbuf = consumer_channels[i].chan->buf; |
| 102 | long consumed_old; |
| 103 | |
| 104 | result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); |
| 105 | if(result < 0) { |
| 106 | DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); |
| 107 | } |
| 108 | else { |
| 109 | DBG("success!"); |
| 110 | |
| 111 | result = write(consumer_channels[i].fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096); |
| 112 | ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | sleep(1); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | void start_consumer(void) |
| 121 | { |
| 122 | #ifdef USE_CLONE |
| 123 | int result; |
| 124 | |
| 125 | result = clone(consumer, consumer_stack+sizeof(consumer_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
| 126 | if(result == -1) { |
| 127 | perror("clone"); |
| 128 | } |
| 129 | #else |
| 130 | pthread_t thread; |
| 131 | |
| 132 | pthread_create(&thread, NULL, consumer, NULL); |
| 133 | #endif |
| 134 | } |
| 135 | |
| 136 | static void print_markers(void) |
| 137 | { |
| 138 | struct marker_iter iter; |
| 139 | |
| 140 | lock_markers(); |
| 141 | marker_iter_reset(&iter); |
| 142 | marker_iter_start(&iter); |
| 143 | |
| 144 | while(iter.marker) { |
| 145 | fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format); |
| 146 | marker_iter_next(&iter); |
| 147 | } |
| 148 | unlock_markers(); |
| 149 | } |
| 150 | |
| 151 | void do_command(struct tracecmd *cmd) |
| 152 | { |
| 153 | } |
| 154 | |
| 155 | void receive_commands() |
| 156 | { |
| 157 | } |
| 158 | |
| 159 | int fd_notif = -1; |
| 160 | void notif_cb(void) |
| 161 | { |
| 162 | int result; |
| 163 | struct trctl_msg msg; |
| 164 | |
| 165 | /* FIXME: fd_notif should probably be protected by a spinlock */ |
| 166 | |
| 167 | if(fd_notif == -1) |
| 168 | return; |
| 169 | |
| 170 | msg.type = MSG_NOTIF; |
| 171 | msg.size = sizeof(msg.type); |
| 172 | |
| 173 | /* FIXME: don't block here */ |
| 174 | result = write(fd_notif, &msg, msg.size+sizeof(msg.size)); |
| 175 | if(result == -1) { |
| 176 | PERROR("write"); |
| 177 | return; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | static int inform_consumer_daemon(void) |
| 182 | { |
| 183 | ustcomm_request_consumer(getpid(), "metadata"); |
| 184 | ustcomm_request_consumer(getpid(), "ust"); |
| 185 | } |
| 186 | |
| 187 | int listener_main(void *p) |
| 188 | { |
| 189 | int result; |
| 190 | |
| 191 | DBG("LISTENER"); |
| 192 | |
| 193 | for(;;) { |
| 194 | uint32_t size; |
| 195 | struct sockaddr_un addr; |
| 196 | socklen_t addrlen = sizeof(addr); |
| 197 | char trace_name[] = "auto"; |
| 198 | char trace_type[] = "ustrelay"; |
| 199 | char *recvbuf; |
| 200 | int len; |
| 201 | struct ustcomm_source src; |
| 202 | |
| 203 | result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, -1); |
| 204 | if(result <= 0) { |
| 205 | WARN("error in ustcomm_app_recv_message"); |
| 206 | continue; |
| 207 | } |
| 208 | |
| 209 | DBG("received a message! it's: %s\n", recvbuf); |
| 210 | len = strlen(recvbuf); |
| 211 | |
| 212 | if(!strcmp(recvbuf, "print_markers")) { |
| 213 | print_markers(); |
| 214 | } |
| 215 | else if(!strcmp(recvbuf, "trace_setup")) { |
| 216 | DBG("trace setup"); |
| 217 | |
| 218 | result = ltt_trace_setup(trace_name); |
| 219 | if(result < 0) { |
| 220 | ERR("ltt_trace_setup failed"); |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | result = ltt_trace_set_type(trace_name, trace_type); |
| 225 | if(result < 0) { |
| 226 | ERR("ltt_trace_set_type failed"); |
| 227 | return; |
| 228 | } |
| 229 | } |
| 230 | else if(!strcmp(recvbuf, "trace_alloc")) { |
| 231 | DBG("trace alloc"); |
| 232 | |
| 233 | result = ltt_trace_alloc(trace_name); |
| 234 | if(result < 0) { |
| 235 | ERR("ltt_trace_alloc failed"); |
| 236 | return; |
| 237 | } |
| 238 | } |
| 239 | else if(!strcmp(recvbuf, "trace_start")) { |
| 240 | DBG("trace start"); |
| 241 | |
| 242 | result = ltt_trace_start(trace_name); |
| 243 | if(result < 0) { |
| 244 | ERR("ltt_trace_start failed"); |
| 245 | continue; |
| 246 | } |
| 247 | } |
| 248 | else if(!strcmp(recvbuf, "trace_stop")) { |
| 249 | DBG("trace stop"); |
| 250 | |
| 251 | result = ltt_trace_stop(trace_name); |
| 252 | if(result < 0) { |
| 253 | ERR("ltt_trace_stop failed"); |
| 254 | return; |
| 255 | } |
| 256 | } |
| 257 | else if(!strcmp(recvbuf, "trace_destroy")) { |
| 258 | |
| 259 | DBG("trace destroy"); |
| 260 | |
| 261 | result = ltt_trace_destroy(trace_name); |
| 262 | if(result < 0) { |
| 263 | ERR("ltt_trace_destroy failed"); |
| 264 | return; |
| 265 | } |
| 266 | } |
| 267 | else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) { |
| 268 | struct ltt_trace_struct *trace; |
| 269 | char trace_name[] = "auto"; |
| 270 | int i; |
| 271 | char *channel_name; |
| 272 | |
| 273 | DBG("get_shmid"); |
| 274 | |
| 275 | channel_name = nth_token(recvbuf, 1); |
| 276 | if(channel_name == NULL) { |
| 277 | ERR("get_shmid: cannot parse channel"); |
| 278 | goto next_cmd; |
| 279 | } |
| 280 | |
| 281 | ltt_lock_traces(); |
| 282 | trace = _ltt_trace_find(trace_name); |
| 283 | ltt_unlock_traces(); |
| 284 | |
| 285 | if(trace == NULL) { |
| 286 | CPRINTF("cannot find trace!"); |
| 287 | return 1; |
| 288 | } |
| 289 | |
| 290 | for(i=0; i<trace->nr_channels; i++) { |
| 291 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 292 | struct rchan_buf *rbuf = rchan->buf; |
| 293 | |
| 294 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 295 | char *reply; |
| 296 | |
| 297 | DBG("the shmid for the requested channel is %d", rbuf->shmid); |
| 298 | asprintf(&reply, "%d", rbuf->shmid); |
| 299 | |
| 300 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 301 | if(result) { |
| 302 | ERR("listener: get_shmid: ustcomm_send_reply failed"); |
| 303 | goto next_cmd; |
| 304 | } |
| 305 | |
| 306 | free(reply); |
| 307 | |
| 308 | break; |
| 309 | } |
| 310 | } |
| 311 | } |
| 312 | else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) { |
| 313 | struct ltt_trace_struct *trace; |
| 314 | char trace_name[] = "auto"; |
| 315 | int i; |
| 316 | char *channel_name; |
| 317 | |
| 318 | DBG("get_n_subbufs"); |
| 319 | |
| 320 | channel_name = nth_token(recvbuf, 1); |
| 321 | if(channel_name == NULL) { |
| 322 | ERR("get_n_subbufs: cannot parse channel"); |
| 323 | goto next_cmd; |
| 324 | } |
| 325 | |
| 326 | ltt_lock_traces(); |
| 327 | trace = _ltt_trace_find(trace_name); |
| 328 | ltt_unlock_traces(); |
| 329 | |
| 330 | if(trace == NULL) { |
| 331 | CPRINTF("cannot find trace!"); |
| 332 | return 1; |
| 333 | } |
| 334 | |
| 335 | for(i=0; i<trace->nr_channels; i++) { |
| 336 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 337 | |
| 338 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 339 | char *reply; |
| 340 | |
| 341 | DBG("the n_subbufs for the requested channel is %d", rchan->n_subbufs); |
| 342 | asprintf(&reply, "%d", rchan->n_subbufs); |
| 343 | |
| 344 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 345 | if(result) { |
| 346 | ERR("listener: get_n_subbufs: ustcomm_send_reply failed"); |
| 347 | goto next_cmd; |
| 348 | } |
| 349 | |
| 350 | free(reply); |
| 351 | |
| 352 | break; |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) { |
| 357 | struct ltt_trace_struct *trace; |
| 358 | char trace_name[] = "auto"; |
| 359 | int i; |
| 360 | char *channel_name; |
| 361 | |
| 362 | DBG("get_subbuf_size"); |
| 363 | |
| 364 | channel_name = nth_token(recvbuf, 1); |
| 365 | if(channel_name == NULL) { |
| 366 | ERR("get_subbuf_size: cannot parse channel"); |
| 367 | goto next_cmd; |
| 368 | } |
| 369 | |
| 370 | ltt_lock_traces(); |
| 371 | trace = _ltt_trace_find(trace_name); |
| 372 | ltt_unlock_traces(); |
| 373 | |
| 374 | if(trace == NULL) { |
| 375 | CPRINTF("cannot find trace!"); |
| 376 | return 1; |
| 377 | } |
| 378 | |
| 379 | for(i=0; i<trace->nr_channels; i++) { |
| 380 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 381 | |
| 382 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 383 | char *reply; |
| 384 | |
| 385 | DBG("the subbuf_size for the requested channel is %d", rchan->subbuf_size); |
| 386 | asprintf(&reply, "%d", rchan->subbuf_size); |
| 387 | |
| 388 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 389 | if(result) { |
| 390 | ERR("listener: get_subbuf_size: ustcomm_send_reply failed"); |
| 391 | goto next_cmd; |
| 392 | } |
| 393 | |
| 394 | free(reply); |
| 395 | |
| 396 | break; |
| 397 | } |
| 398 | } |
| 399 | } |
| 400 | else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) { |
| 401 | char *libfile; |
| 402 | |
| 403 | libfile = nth_token(recvbuf, 1); |
| 404 | |
| 405 | DBG("load_probe_lib loading %s", libfile); |
| 406 | } |
| 407 | else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) { |
| 408 | struct ltt_trace_struct *trace; |
| 409 | char trace_name[] = "auto"; |
| 410 | int i; |
| 411 | char *channel_name; |
| 412 | |
| 413 | DBG("get_subbuf"); |
| 414 | |
| 415 | channel_name = nth_token(recvbuf, 1); |
| 416 | if(channel_name == NULL) { |
| 417 | ERR("get_subbuf: cannot parse channel"); |
| 418 | goto next_cmd; |
| 419 | } |
| 420 | |
| 421 | ltt_lock_traces(); |
| 422 | trace = _ltt_trace_find(trace_name); |
| 423 | ltt_unlock_traces(); |
| 424 | |
| 425 | if(trace == NULL) { |
| 426 | CPRINTF("cannot find trace!"); |
| 427 | return 1; |
| 428 | } |
| 429 | |
| 430 | for(i=0; i<trace->nr_channels; i++) { |
| 431 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 432 | |
| 433 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 434 | struct rchan_buf *rbuf = rchan->buf; |
| 435 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 436 | char *reply; |
| 437 | long consumed_old=0; |
| 438 | |
| 439 | result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old); |
| 440 | if(result < 0) { |
| 441 | DBG("ltt_do_get_subbuf: error: %s", strerror(-result)); |
| 442 | asprintf(&reply, "%s %ld", "UNAVAIL", 0); |
| 443 | } |
| 444 | else { |
| 445 | DBG("ltt_do_get_subbuf: success"); |
| 446 | asprintf(&reply, "%s %ld", "OK", consumed_old); |
| 447 | } |
| 448 | |
| 449 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 450 | if(result) { |
| 451 | ERR("listener: get_subbuf: ustcomm_send_reply failed"); |
| 452 | goto next_cmd; |
| 453 | } |
| 454 | |
| 455 | free(reply); |
| 456 | |
| 457 | break; |
| 458 | } |
| 459 | } |
| 460 | } |
| 461 | else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) { |
| 462 | struct ltt_trace_struct *trace; |
| 463 | char trace_name[] = "auto"; |
| 464 | int i; |
| 465 | char *channel_name; |
| 466 | long consumed_old; |
| 467 | char *consumed_old_str; |
| 468 | char *endptr; |
| 469 | |
| 470 | DBG("put_subbuf"); |
| 471 | |
| 472 | channel_name = strdup_malloc(nth_token(recvbuf, 1)); |
| 473 | if(channel_name == NULL) { |
| 474 | ERR("put_subbuf_size: cannot parse channel"); |
| 475 | goto next_cmd; |
| 476 | } |
| 477 | |
| 478 | consumed_old_str = strdup_malloc(nth_token(recvbuf, 2)); |
| 479 | if(consumed_old_str == NULL) { |
| 480 | ERR("put_subbuf: cannot parse consumed_old"); |
| 481 | goto next_cmd; |
| 482 | } |
| 483 | consumed_old = strtol(consumed_old_str, &endptr, 10); |
| 484 | if(*endptr != '\0') { |
| 485 | ERR("put_subbuf: invalid value for consumed_old"); |
| 486 | goto next_cmd; |
| 487 | } |
| 488 | |
| 489 | ltt_lock_traces(); |
| 490 | trace = _ltt_trace_find(trace_name); |
| 491 | ltt_unlock_traces(); |
| 492 | |
| 493 | if(trace == NULL) { |
| 494 | CPRINTF("cannot find trace!"); |
| 495 | return 1; |
| 496 | } |
| 497 | |
| 498 | for(i=0; i<trace->nr_channels; i++) { |
| 499 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 500 | |
| 501 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 502 | struct rchan_buf *rbuf = rchan->buf; |
| 503 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 504 | char *reply; |
| 505 | long consumed_old=0; |
| 506 | |
| 507 | result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old); |
| 508 | if(result < 0) { |
| 509 | WARN("ltt_do_put_subbuf: error"); |
| 510 | } |
| 511 | else { |
| 512 | DBG("ltt_do_put_subbuf: success"); |
| 513 | } |
| 514 | asprintf(&reply, "%s", "OK", consumed_old); |
| 515 | |
| 516 | result = ustcomm_send_reply(&ustcomm_app.server, reply, &src); |
| 517 | if(result) { |
| 518 | ERR("listener: put_subbuf: ustcomm_send_reply failed"); |
| 519 | goto next_cmd; |
| 520 | } |
| 521 | |
| 522 | free(reply); |
| 523 | |
| 524 | break; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | free(channel_name); |
| 529 | free(consumed_old_str); |
| 530 | } |
| 531 | else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) { |
| 532 | struct ltt_trace_struct *trace; |
| 533 | char trace_name[] = "auto"; |
| 534 | int i; |
| 535 | char *channel_name; |
| 536 | |
| 537 | DBG("get_notifications"); |
| 538 | |
| 539 | channel_name = strdup_malloc(nth_token(recvbuf, 1)); |
| 540 | if(channel_name == NULL) { |
| 541 | ERR("put_subbuf_size: cannot parse channel"); |
| 542 | goto next_cmd; |
| 543 | } |
| 544 | |
| 545 | ltt_lock_traces(); |
| 546 | trace = _ltt_trace_find(trace_name); |
| 547 | ltt_unlock_traces(); |
| 548 | |
| 549 | if(trace == NULL) { |
| 550 | CPRINTF("cannot find trace!"); |
| 551 | return 1; |
| 552 | } |
| 553 | |
| 554 | for(i=0; i<trace->nr_channels; i++) { |
| 555 | struct rchan *rchan = trace->channels[i].trans_channel_data; |
| 556 | int fd; |
| 557 | |
| 558 | if(!strcmp(trace->channels[i].channel_name, channel_name)) { |
| 559 | struct rchan_buf *rbuf = rchan->buf; |
| 560 | struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf; |
| 561 | |
| 562 | result = fd = ustcomm_app_detach_client(&ustcomm_app, &src); |
| 563 | if(result == -1) { |
| 564 | ERR("ustcomm_app_detach_client failed"); |
| 565 | goto next_cmd; |
| 566 | } |
| 567 | |
| 568 | lttbuf->wake_consumer_arg = (void *) fd; |
| 569 | |
| 570 | smp_wmb(); |
| 571 | |
| 572 | lttbuf->call_wake_consumer = 1; |
| 573 | |
| 574 | break; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | free(channel_name); |
| 579 | } |
| 580 | else { |
| 581 | ERR("unable to parse message: %s", recvbuf); |
| 582 | } |
| 583 | |
| 584 | next_cmd: |
| 585 | free(recvbuf); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | static char listener_stack[16384]; |
| 590 | |
| 591 | void create_listener(void) |
| 592 | { |
| 593 | int result; |
| 594 | static char listener_stack[16384]; |
| 595 | //char *listener_stack = malloc(16384); |
| 596 | |
| 597 | #ifdef USE_CLONE |
| 598 | result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL); |
| 599 | if(result == -1) { |
| 600 | perror("clone"); |
| 601 | } |
| 602 | #else |
| 603 | pthread_t thread; |
| 604 | |
| 605 | pthread_create(&thread, NULL, listener_main, NULL); |
| 606 | #endif |
| 607 | } |
| 608 | |
| 609 | /* The signal handler itself. Signals must be setup so there cannot be |
| 610 | nested signals. */ |
| 611 | |
| 612 | void sighandler(int sig) |
| 613 | { |
| 614 | static char have_listener = 0; |
| 615 | DBG("sighandler"); |
| 616 | |
| 617 | if(!have_listener) { |
| 618 | create_listener(); |
| 619 | have_listener = 1; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /* Called by the app signal handler to chain it to us. */ |
| 624 | |
| 625 | void chain_signal(void) |
| 626 | { |
| 627 | sighandler(USTSIGNAL); |
| 628 | } |
| 629 | |
| 630 | static int init_socket(void) |
| 631 | { |
| 632 | return ustcomm_init_app(getpid(), &ustcomm_app); |
| 633 | } |
| 634 | |
| 635 | static void destroy_socket(void) |
| 636 | { |
| 637 | // int result; |
| 638 | // |
| 639 | // if(mysocketfile[0] == '\0') |
| 640 | // return; |
| 641 | // |
| 642 | // result = unlink(mysocketfile); |
| 643 | // if(result == -1) { |
| 644 | // PERROR("unlink"); |
| 645 | // } |
| 646 | } |
| 647 | |
| 648 | static int init_signal_handler(void) |
| 649 | { |
| 650 | /* Attempt to handler SIGIO. If the main program wants to |
| 651 | * handle it, fine, it'll override us. They it'll have to |
| 652 | * use the chaining function. |
| 653 | */ |
| 654 | |
| 655 | int result; |
| 656 | struct sigaction act; |
| 657 | |
| 658 | result = sigemptyset(&act.sa_mask); |
| 659 | if(result == -1) { |
| 660 | PERROR("sigemptyset"); |
| 661 | return -1; |
| 662 | } |
| 663 | |
| 664 | act.sa_handler = sighandler; |
| 665 | act.sa_flags = SA_RESTART; |
| 666 | |
| 667 | /* Only defer ourselves. Also, try to restart interrupted |
| 668 | * syscalls to disturb the traced program as little as possible. |
| 669 | */ |
| 670 | result = sigaction(SIGIO, &act, NULL); |
| 671 | if(result == -1) { |
| 672 | PERROR("sigaction"); |
| 673 | return -1; |
| 674 | } |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static void auto_probe_connect(struct marker *m) |
| 680 | { |
| 681 | int result; |
| 682 | |
| 683 | result = ltt_marker_connect(m->channel, m->name, "default"); |
| 684 | if(result) |
| 685 | ERR("ltt_marker_connect"); |
| 686 | |
| 687 | DBG("just auto connected marker %s %s to probe default", m->channel, m->name); |
| 688 | } |
| 689 | |
| 690 | /* Wake the consumer of a buffer |
| 691 | * |
| 692 | * wake_consumer_cb is called in tracing context so it must haste. |
| 693 | * |
| 694 | * FIXME: don't do a system call here; maybe schedule work to be done |
| 695 | * in listener context? Once this is done in listener context, we can |
| 696 | * check for the return value of send_message_fd and remove the fd if necessary |
| 697 | * |
| 698 | * @arg: the buffer |
| 699 | * @finished: 0: subbuffer full; 1: buffer being destroyed |
| 700 | */ |
| 701 | |
| 702 | static void wake_consumer_cb(void *arg, int finished) |
| 703 | { |
| 704 | struct ltt_channel_buf_struct *ltt_buf = (struct ltt_channel_buf_struct *) arg; |
| 705 | int fd = (int)ACCESS_ONCE(arg); |
| 706 | |
| 707 | if(!finished) { |
| 708 | send_message_fd(fd, "consume", NULL); |
| 709 | } |
| 710 | else { |
| 711 | send_message_fd(fd, "destroyed", NULL); |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | static void __attribute__((constructor(101))) init0() |
| 716 | { |
| 717 | DBG("UST_AUTOPROBE constructor"); |
| 718 | if(getenv("UST_AUTOPROBE")) { |
| 719 | marker_set_new_marker_cb(auto_probe_connect); |
| 720 | } |
| 721 | |
| 722 | relay_set_wake_consumer(wake_consumer_cb); |
| 723 | } |
| 724 | |
| 725 | static void fini(void); |
| 726 | |
| 727 | static void __attribute__((constructor(1000))) init() |
| 728 | { |
| 729 | int result; |
| 730 | |
| 731 | DBG("UST_TRACE constructor"); |
| 732 | |
| 733 | /* Must create socket before signal handler to prevent races. |
| 734 | */ |
| 735 | result = init_socket(); |
| 736 | if(result == -1) { |
| 737 | ERR("init_socket error"); |
| 738 | return; |
| 739 | } |
| 740 | result = init_signal_handler(); |
| 741 | if(result == -1) { |
| 742 | ERR("init_signal_handler error"); |
| 743 | return; |
| 744 | } |
| 745 | |
| 746 | if(getenv("UST_TRACE")) { |
| 747 | char trace_name[] = "auto"; |
| 748 | char trace_type[] = "ustrelay"; |
| 749 | |
| 750 | DBG("starting early tracing"); |
| 751 | |
| 752 | /* Ensure marker control is initialized */ |
| 753 | init_marker_control(); |
| 754 | |
| 755 | /* Ensure relay is initialized */ |
| 756 | init_ustrelay_transport(); |
| 757 | |
| 758 | /* Ensure markers are initialized */ |
| 759 | init_markers(); |
| 760 | |
| 761 | /* In case. */ |
| 762 | ltt_channels_register("ust"); |
| 763 | |
| 764 | result = ltt_trace_setup(trace_name); |
| 765 | if(result < 0) { |
| 766 | ERR("ltt_trace_setup failed"); |
| 767 | return; |
| 768 | } |
| 769 | |
| 770 | result = ltt_trace_set_type(trace_name, trace_type); |
| 771 | if(result < 0) { |
| 772 | ERR("ltt_trace_set_type failed"); |
| 773 | return; |
| 774 | } |
| 775 | |
| 776 | result = ltt_trace_alloc(trace_name); |
| 777 | if(result < 0) { |
| 778 | ERR("ltt_trace_alloc failed"); |
| 779 | return; |
| 780 | } |
| 781 | |
| 782 | result = ltt_trace_start(trace_name); |
| 783 | if(result < 0) { |
| 784 | ERR("ltt_trace_start failed"); |
| 785 | return; |
| 786 | } |
| 787 | //start_consumer(); |
| 788 | inform_consumer_daemon(); |
| 789 | } |
| 790 | |
| 791 | |
| 792 | return; |
| 793 | |
| 794 | /* should decrementally destroy stuff if error */ |
| 795 | |
| 796 | } |
| 797 | |
| 798 | /* This is only called if we terminate normally, not with an unhandled signal, |
| 799 | * so we cannot rely on it. */ |
| 800 | |
| 801 | static void __attribute__((destructor)) fini() |
| 802 | { |
| 803 | int result; |
| 804 | |
| 805 | /* if trace running, finish it */ |
| 806 | |
| 807 | DBG("destructor stopping traces"); |
| 808 | |
| 809 | result = ltt_trace_stop("auto"); |
| 810 | if(result == -1) { |
| 811 | ERR("ltt_trace_stop error"); |
| 812 | } |
| 813 | |
| 814 | result = ltt_trace_destroy("auto"); |
| 815 | if(result == -1) { |
| 816 | ERR("ltt_trace_destroy error"); |
| 817 | } |
| 818 | |
| 819 | /* FIXME: wait for the consumer to be done */ |
| 820 | DBG("waiting 5 sec for consume"); |
| 821 | sleep(5); |
| 822 | |
| 823 | destroy_socket(); |
| 824 | } |