| 1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
| 2 | * 2010 Alexis Halle |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | |
| 21 | #include <sys/epoll.h> |
| 22 | #include <sys/shm.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <unistd.h> |
| 26 | #include <pthread.h> |
| 27 | #include <signal.h> |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <stdio.h> |
| 31 | #include <string.h> |
| 32 | #include <errno.h> |
| 33 | #include <assert.h> |
| 34 | |
| 35 | #include <ust/ustd.h> |
| 36 | #include "lowlevel.h" |
| 37 | #include "usterr.h" |
| 38 | #include "ustcomm.h" |
| 39 | |
| 40 | /* return value: 0 = subbuffer is finished, it won't produce data anymore |
| 41 | * 1 = got subbuffer successfully |
| 42 | * <0 = error |
| 43 | */ |
| 44 | |
| 45 | #define GET_SUBBUF_OK 1 |
| 46 | #define GET_SUBBUF_DONE 0 |
| 47 | #define GET_SUBBUF_DIED 2 |
| 48 | |
| 49 | #define PUT_SUBBUF_OK 1 |
| 50 | #define PUT_SUBBUF_DIED 0 |
| 51 | #define PUT_SUBBUF_PUSHED 2 |
| 52 | #define PUT_SUBBUF_DONE 3 |
| 53 | |
| 54 | #define UNIX_PATH_MAX 108 |
| 55 | |
| 56 | int get_subbuffer(struct buffer_info *buf) |
| 57 | { |
| 58 | char *send_msg=NULL; |
| 59 | char *received_msg=NULL; |
| 60 | char *rep_code=NULL; |
| 61 | int retval; |
| 62 | int result; |
| 63 | |
| 64 | if (asprintf(&send_msg, "get_subbuffer %s", buf->name) < 0) { |
| 65 | ERR("get_subbuffer : asprintf failed (%s)", |
| 66 | buf->name); |
| 67 | retval = -1; |
| 68 | goto end; |
| 69 | } |
| 70 | |
| 71 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 72 | if((result == -1 && (errno == ECONNRESET || errno == EPIPE)) || result == 0) { |
| 73 | DBG("app died while being traced"); |
| 74 | retval = GET_SUBBUF_DIED; |
| 75 | goto end; |
| 76 | } |
| 77 | else if(result < 0) { |
| 78 | ERR("get_subbuffer: ustcomm_send_request failed"); |
| 79 | retval = -1; |
| 80 | goto end; |
| 81 | } |
| 82 | |
| 83 | result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old); |
| 84 | if(result != 2 && result != 1) { |
| 85 | ERR("unable to parse response to get_subbuffer"); |
| 86 | retval = -1; |
| 87 | free(received_msg); |
| 88 | goto end_rep; |
| 89 | } |
| 90 | |
| 91 | if (!strcmp(rep_code, "OK")) { |
| 92 | DBG("got subbuffer %s", buf->name); |
| 93 | retval = GET_SUBBUF_OK; |
| 94 | } else if(!strcmp(received_msg, "NOTFOUND")) { |
| 95 | DBG("For buffer %s, the trace was not found. This likely means it was destroyed by the user.", buf->name); |
| 96 | retval = GET_SUBBUF_DIED; |
| 97 | goto end_rep; |
| 98 | } else { |
| 99 | DBG("error getting subbuffer %s", buf->name); |
| 100 | retval = -1; |
| 101 | } |
| 102 | |
| 103 | /* FIXME: free correctly the stuff */ |
| 104 | end_rep: |
| 105 | if(rep_code) |
| 106 | free(rep_code); |
| 107 | end: |
| 108 | if(send_msg) |
| 109 | free(send_msg); |
| 110 | if(received_msg) |
| 111 | free(received_msg); |
| 112 | |
| 113 | return retval; |
| 114 | } |
| 115 | |
| 116 | int put_subbuffer(struct buffer_info *buf) |
| 117 | { |
| 118 | char *send_msg=NULL; |
| 119 | char *received_msg=NULL; |
| 120 | char *rep_code=NULL; |
| 121 | int retval; |
| 122 | int result; |
| 123 | |
| 124 | if (asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old) < 0) { |
| 125 | ERR("put_subbuffer : asprintf failed (%s %ld)", |
| 126 | buf->name, buf->consumed_old); |
| 127 | retval = -1; |
| 128 | goto end; |
| 129 | } |
| 130 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 131 | if(result < 0 && (errno == ECONNRESET || errno == EPIPE)) { |
| 132 | retval = PUT_SUBBUF_DIED; |
| 133 | goto end; |
| 134 | } |
| 135 | else if(result < 0) { |
| 136 | ERR("put_subbuffer: send_message failed"); |
| 137 | retval = -1; |
| 138 | goto end; |
| 139 | } |
| 140 | else if(result == 0) { |
| 141 | /* Program seems finished. However this might not be |
| 142 | * the last subbuffer that has to be collected. |
| 143 | */ |
| 144 | retval = PUT_SUBBUF_DIED; |
| 145 | goto end; |
| 146 | } |
| 147 | |
| 148 | result = sscanf(received_msg, "%as", &rep_code); |
| 149 | if(result != 1) { |
| 150 | ERR("unable to parse response to put_subbuffer"); |
| 151 | retval = -1; |
| 152 | goto end_rep; |
| 153 | } |
| 154 | |
| 155 | if(!strcmp(rep_code, "OK")) { |
| 156 | DBG("subbuffer put %s", buf->name); |
| 157 | retval = PUT_SUBBUF_OK; |
| 158 | } |
| 159 | else if(!strcmp(received_msg, "NOTFOUND")) { |
| 160 | DBG("For buffer %s, the trace was not found. This likely means it was destroyed by the user.", buf->name); |
| 161 | /* However, maybe this was not the last subbuffer. So |
| 162 | * we return the program died. |
| 163 | */ |
| 164 | retval = PUT_SUBBUF_DIED; |
| 165 | goto end_rep; |
| 166 | } |
| 167 | else { |
| 168 | DBG("put_subbuffer: received error, we were pushed"); |
| 169 | retval = PUT_SUBBUF_PUSHED; |
| 170 | goto end_rep; |
| 171 | } |
| 172 | |
| 173 | end_rep: |
| 174 | if(rep_code) |
| 175 | free(rep_code); |
| 176 | |
| 177 | end: |
| 178 | if(send_msg) |
| 179 | free(send_msg); |
| 180 | if(received_msg) |
| 181 | free(received_msg); |
| 182 | |
| 183 | return retval; |
| 184 | } |
| 185 | |
| 186 | void decrement_active_buffers(void *arg) |
| 187 | { |
| 188 | struct libustd_instance *instance = arg; |
| 189 | pthread_mutex_lock(&instance->mutex); |
| 190 | instance->active_buffers--; |
| 191 | pthread_mutex_unlock(&instance->mutex); |
| 192 | } |
| 193 | |
| 194 | struct buffer_info *connect_buffer(struct libustd_instance *instance, pid_t pid, const char *bufname) |
| 195 | { |
| 196 | struct buffer_info *buf; |
| 197 | char *send_msg; |
| 198 | char *received_msg; |
| 199 | int result; |
| 200 | struct shmid_ds shmds; |
| 201 | struct ustcomm_header header; |
| 202 | |
| 203 | buf = (struct buffer_info *) zmalloc(sizeof(struct buffer_info)); |
| 204 | if(buf == NULL) { |
| 205 | ERR("add_buffer: insufficient memory"); |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | buf->name = bufname; |
| 210 | buf->pid = pid; |
| 211 | |
| 212 | /* FIXME: Fix all the freeing and exit sequence from this functions */ |
| 213 | /* connect to app */ |
| 214 | result = ustcomm_connect_app(buf->pid, &buf->app_sock); |
| 215 | if(result) { |
| 216 | WARN("unable to connect to process, it probably died before we were able to connect"); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | /* get pidunique */ |
| 221 | if (asprintf(&send_msg, "get_pidunique") < 0) { |
| 222 | ERR("connect_buffer : asprintf failed (get_pidunique)"); |
| 223 | return NULL; |
| 224 | } |
| 225 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 226 | free(send_msg); |
| 227 | if(result == -1) { |
| 228 | ERR("problem in ustcomm_send_request(get_pidunique)"); |
| 229 | return NULL; |
| 230 | } |
| 231 | if(result == 0) { |
| 232 | goto error; |
| 233 | } |
| 234 | |
| 235 | result = sscanf(received_msg, "%lld", &buf->pidunique); |
| 236 | if(result != 1) { |
| 237 | ERR("unable to parse response to get_pidunique"); |
| 238 | return NULL; |
| 239 | } |
| 240 | free(received_msg); |
| 241 | DBG("got pidunique %lld", buf->pidunique); |
| 242 | |
| 243 | /* get shmid */ |
| 244 | if (asprintf(&send_msg, "get_shmid %s", buf->name) < 0) { |
| 245 | ERR("connect_buffer : asprintf failed (get_schmid %s)", |
| 246 | buf->name); |
| 247 | return NULL; |
| 248 | } |
| 249 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 250 | free(send_msg); |
| 251 | if(result == -1) { |
| 252 | ERR("problem in ustcomm_send_request(get_shmid)"); |
| 253 | return NULL; |
| 254 | } |
| 255 | if(result == 0) { |
| 256 | goto error; |
| 257 | } |
| 258 | |
| 259 | result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid); |
| 260 | if(result != 2) { |
| 261 | ERR("unable to parse response to get_shmid (\"%s\")", received_msg); |
| 262 | return NULL; |
| 263 | } |
| 264 | free(received_msg); |
| 265 | DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid); |
| 266 | |
| 267 | /* get n_subbufs */ |
| 268 | if (asprintf(&send_msg, "get_n_subbufs %s", buf->name) < 0) { |
| 269 | ERR("connect_buffer : asprintf failed (get_n_subbufs %s)", |
| 270 | buf->name); |
| 271 | return NULL; |
| 272 | } |
| 273 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 274 | free(send_msg); |
| 275 | if(result == -1) { |
| 276 | ERR("problem in ustcomm_send_request(g_n_subbufs)"); |
| 277 | return NULL; |
| 278 | } |
| 279 | if(result == 0) { |
| 280 | goto error; |
| 281 | } |
| 282 | |
| 283 | result = sscanf(received_msg, "%d", &buf->n_subbufs); |
| 284 | if(result != 1) { |
| 285 | ERR("unable to parse response to get_n_subbufs"); |
| 286 | return NULL; |
| 287 | } |
| 288 | free(received_msg); |
| 289 | DBG("got n_subbufs %d", buf->n_subbufs); |
| 290 | |
| 291 | /* get subbuf size */ |
| 292 | if (asprintf(&send_msg, "get_subbuf_size %s", buf->name) < 0) { |
| 293 | ERR("connect_buffer : asprintf failed (get_subbuf_size %s)", |
| 294 | buf->name); |
| 295 | return NULL; |
| 296 | } |
| 297 | result = ustcomm_send_request(buf->app_sock, send_msg, &received_msg); |
| 298 | free(send_msg); |
| 299 | if(result == -1) { |
| 300 | ERR("problem in ustcomm_send_request(get_subbuf_size)"); |
| 301 | return NULL; |
| 302 | } |
| 303 | if(result == 0) { |
| 304 | goto error; |
| 305 | } |
| 306 | |
| 307 | result = sscanf(received_msg, "%d", &buf->subbuf_size); |
| 308 | if(result != 1) { |
| 309 | ERR("unable to parse response to get_subbuf_size"); |
| 310 | return NULL; |
| 311 | } |
| 312 | free(received_msg); |
| 313 | DBG("got subbuf_size %d", buf->subbuf_size); |
| 314 | |
| 315 | /* attach memory */ |
| 316 | buf->mem = shmat(buf->shmid, NULL, 0); |
| 317 | if(buf->mem == (void *) 0) { |
| 318 | PERROR("shmat"); |
| 319 | return NULL; |
| 320 | } |
| 321 | DBG("successfully attached buffer memory"); |
| 322 | |
| 323 | buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0); |
| 324 | if(buf->bufstruct_mem == (void *) 0) { |
| 325 | PERROR("shmat"); |
| 326 | return NULL; |
| 327 | } |
| 328 | DBG("successfully attached buffer bufstruct memory"); |
| 329 | |
| 330 | /* obtain info on the memory segment */ |
| 331 | result = shmctl(buf->shmid, IPC_STAT, &shmds); |
| 332 | if(result == -1) { |
| 333 | PERROR("shmctl"); |
| 334 | return NULL; |
| 335 | } |
| 336 | buf->memlen = shmds.shm_segsz; |
| 337 | |
| 338 | /* get buffer pipe fd */ |
| 339 | memset(&header, 0, sizeof(header)); |
| 340 | if (asprintf(&send_msg, "get_buffer_fd %s", buf->name) < 0) { |
| 341 | ERR("connect_buffer : asprintf failed (get_buffer_fd %s)", |
| 342 | buf->name); |
| 343 | return NULL; |
| 344 | } |
| 345 | header.size = strlen(send_msg) + 1; |
| 346 | result = ustcomm_send(buf->app_sock, &header, send_msg); |
| 347 | free(send_msg); |
| 348 | if (result <= 0) { |
| 349 | ERR("ustcomm_send failed."); |
| 350 | return NULL; |
| 351 | } |
| 352 | result = ustcomm_recv_fd(buf->app_sock, &header, NULL, &buf->pipe_fd); |
| 353 | if (result <= 0) { |
| 354 | ERR("ustcomm_recv_fd failed"); |
| 355 | return NULL; |
| 356 | } else { |
| 357 | struct stat temp; |
| 358 | fstat(buf->pipe_fd, &temp); |
| 359 | if (!S_ISFIFO(temp.st_mode)) { |
| 360 | ERR("Didn't receive a fifo from the app"); |
| 361 | return NULL; |
| 362 | } |
| 363 | } |
| 364 | if(instance->callbacks->on_open_buffer) |
| 365 | instance->callbacks->on_open_buffer(instance->callbacks, buf); |
| 366 | |
| 367 | pthread_mutex_lock(&instance->mutex); |
| 368 | instance->active_buffers++; |
| 369 | pthread_mutex_unlock(&instance->mutex); |
| 370 | |
| 371 | return buf; |
| 372 | |
| 373 | error: |
| 374 | free(buf); |
| 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | static void destroy_buffer(struct libustd_callbacks *callbacks, |
| 379 | struct buffer_info *buf) |
| 380 | { |
| 381 | int result; |
| 382 | |
| 383 | result = close(buf->app_sock); |
| 384 | if(result == -1) { |
| 385 | WARN("problem calling ustcomm_close_app"); |
| 386 | } |
| 387 | |
| 388 | result = shmdt(buf->mem); |
| 389 | if(result == -1) { |
| 390 | PERROR("shmdt"); |
| 391 | } |
| 392 | |
| 393 | result = shmdt(buf->bufstruct_mem); |
| 394 | if(result == -1) { |
| 395 | PERROR("shmdt"); |
| 396 | } |
| 397 | |
| 398 | if(callbacks->on_close_buffer) |
| 399 | callbacks->on_close_buffer(callbacks, buf); |
| 400 | |
| 401 | free(buf); |
| 402 | } |
| 403 | |
| 404 | int consumer_loop(struct libustd_instance *instance, struct buffer_info *buf) |
| 405 | { |
| 406 | int result, read_result; |
| 407 | char read_buf; |
| 408 | |
| 409 | pthread_cleanup_push(decrement_active_buffers, instance); |
| 410 | |
| 411 | for(;;) { |
| 412 | read_result = read(buf->pipe_fd, &read_buf, 1); |
| 413 | /* get the subbuffer */ |
| 414 | if (read_result == 1) { |
| 415 | result = get_subbuffer(buf); |
| 416 | if(result == -1) { |
| 417 | ERR("error getting subbuffer"); |
| 418 | continue; |
| 419 | } else if (result == GET_SUBBUF_DIED) { |
| 420 | finish_consuming_dead_subbuffer(instance->callbacks, buf); |
| 421 | break; |
| 422 | } |
| 423 | } else if ((read_result == -1 && (errno == ECONNRESET || errno == EPIPE)) || |
| 424 | result == 0) { |
| 425 | DBG("App died while being traced"); |
| 426 | finish_consuming_dead_subbuffer(instance->callbacks, buf); |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | if(instance->callbacks->on_read_subbuffer) |
| 431 | instance->callbacks->on_read_subbuffer(instance->callbacks, buf); |
| 432 | |
| 433 | /* put the subbuffer */ |
| 434 | result = put_subbuffer(buf); |
| 435 | if(result == -1) { |
| 436 | ERR("unknown error putting subbuffer (channel=%s)", buf->name); |
| 437 | break; |
| 438 | } |
| 439 | else if(result == PUT_SUBBUF_PUSHED) { |
| 440 | ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name); |
| 441 | break; |
| 442 | } |
| 443 | else if(result == PUT_SUBBUF_DIED) { |
| 444 | DBG("application died while putting subbuffer"); |
| 445 | /* Skip the first subbuffer. We are not sure it is trustable |
| 446 | * because the put_subbuffer() did not complete. |
| 447 | */ |
| 448 | if(instance->callbacks->on_put_error) |
| 449 | instance->callbacks->on_put_error(instance->callbacks, buf); |
| 450 | |
| 451 | finish_consuming_dead_subbuffer(instance->callbacks, buf); |
| 452 | break; |
| 453 | } |
| 454 | else if(result == PUT_SUBBUF_DONE) { |
| 455 | /* Done with this subbuffer */ |
| 456 | /* FIXME: add a case where this branch is used? Upon |
| 457 | * normal trace termination, at put_subbuf time, a |
| 458 | * special last-subbuffer code could be returned by |
| 459 | * the listener. |
| 460 | */ |
| 461 | break; |
| 462 | } |
| 463 | else if(result == PUT_SUBBUF_OK) { |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | DBG("thread for buffer %s is stopping", buf->name); |
| 468 | |
| 469 | /* FIXME: destroy, unalloc... */ |
| 470 | |
| 471 | pthread_cleanup_pop(1); |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | struct consumer_thread_args { |
| 477 | pid_t pid; |
| 478 | const char *bufname; |
| 479 | struct libustd_instance *instance; |
| 480 | }; |
| 481 | |
| 482 | void *consumer_thread(void *arg) |
| 483 | { |
| 484 | struct buffer_info *buf; |
| 485 | struct consumer_thread_args *args = (struct consumer_thread_args *) arg; |
| 486 | int result; |
| 487 | sigset_t sigset; |
| 488 | |
| 489 | DBG("GOT ARGS: pid %d bufname %s", args->pid, args->bufname); |
| 490 | |
| 491 | if(args->instance->callbacks->on_new_thread) |
| 492 | args->instance->callbacks->on_new_thread(args->instance->callbacks); |
| 493 | |
| 494 | /* Block signals that should be handled by the main thread. */ |
| 495 | result = sigemptyset(&sigset); |
| 496 | if(result == -1) { |
| 497 | PERROR("sigemptyset"); |
| 498 | goto end; |
| 499 | } |
| 500 | result = sigaddset(&sigset, SIGTERM); |
| 501 | if(result == -1) { |
| 502 | PERROR("sigaddset"); |
| 503 | goto end; |
| 504 | } |
| 505 | result = sigaddset(&sigset, SIGINT); |
| 506 | if(result == -1) { |
| 507 | PERROR("sigaddset"); |
| 508 | goto end; |
| 509 | } |
| 510 | result = sigprocmask(SIG_BLOCK, &sigset, NULL); |
| 511 | if(result == -1) { |
| 512 | PERROR("sigprocmask"); |
| 513 | goto end; |
| 514 | } |
| 515 | |
| 516 | buf = connect_buffer(args->instance, args->pid, args->bufname); |
| 517 | if(buf == NULL) { |
| 518 | ERR("failed to connect to buffer"); |
| 519 | goto end; |
| 520 | } |
| 521 | |
| 522 | consumer_loop(args->instance, buf); |
| 523 | |
| 524 | destroy_buffer(args->instance->callbacks, buf); |
| 525 | |
| 526 | end: |
| 527 | |
| 528 | if(args->instance->callbacks->on_close_thread) |
| 529 | args->instance->callbacks->on_close_thread(args->instance->callbacks); |
| 530 | |
| 531 | free((void *)args->bufname); |
| 532 | free(args); |
| 533 | return NULL; |
| 534 | } |
| 535 | |
| 536 | int start_consuming_buffer( |
| 537 | struct libustd_instance *instance, pid_t pid, const char *bufname) |
| 538 | { |
| 539 | pthread_t thr; |
| 540 | struct consumer_thread_args *args; |
| 541 | int result; |
| 542 | |
| 543 | DBG("beginning of start_consuming_buffer: args: pid %d bufname %s", pid, bufname); |
| 544 | |
| 545 | args = (struct consumer_thread_args *) zmalloc(sizeof(struct consumer_thread_args)); |
| 546 | |
| 547 | args->pid = pid; |
| 548 | args->bufname = strdup(bufname); |
| 549 | args->instance = instance; |
| 550 | DBG("beginning2 of start_consuming_buffer: args: pid %d bufname %s", args->pid, args->bufname); |
| 551 | |
| 552 | result = pthread_create(&thr, NULL, consumer_thread, args); |
| 553 | if(result == -1) { |
| 554 | ERR("pthread_create failed"); |
| 555 | return -1; |
| 556 | } |
| 557 | result = pthread_detach(thr); |
| 558 | if(result == -1) { |
| 559 | ERR("pthread_detach failed"); |
| 560 | return -1; |
| 561 | } |
| 562 | DBG("end of start_consuming_buffer: args: pid %d bufname %s", args->pid, args->bufname); |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | static void process_client_cmd(char *recvbuf, struct libustd_instance *instance) |
| 567 | { |
| 568 | if(!strncmp(recvbuf, "collect", 7)) { |
| 569 | pid_t pid; |
| 570 | char *bufname = NULL; |
| 571 | int result; |
| 572 | |
| 573 | result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname); |
| 574 | if (result != 2) { |
| 575 | ERR("parsing error: %s", recvbuf); |
| 576 | goto free_bufname; |
| 577 | } |
| 578 | |
| 579 | result = start_consuming_buffer(instance, pid, bufname); |
| 580 | if (result < 0) { |
| 581 | ERR("error in add_buffer"); |
| 582 | goto free_bufname; |
| 583 | } |
| 584 | |
| 585 | free_bufname: |
| 586 | if (bufname) { |
| 587 | free(bufname); |
| 588 | } |
| 589 | } else if(!strncmp(recvbuf, "exit", 4)) { |
| 590 | /* Only there to force poll to return */ |
| 591 | } else { |
| 592 | WARN("unknown command: %s", recvbuf); |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | #define MAX_EVENTS 10 |
| 597 | |
| 598 | int libustd_start_instance(struct libustd_instance *instance) |
| 599 | { |
| 600 | struct ustcomm_sock *epoll_sock; |
| 601 | struct epoll_event events[MAX_EVENTS]; |
| 602 | struct sockaddr addr; |
| 603 | int result, epoll_fd, accept_fd, nfds, i, addr_size, timeout; |
| 604 | |
| 605 | if(!instance->is_init) { |
| 606 | ERR("libustd instance not initialized"); |
| 607 | return 1; |
| 608 | } |
| 609 | epoll_fd = instance->epoll_fd; |
| 610 | |
| 611 | timeout = -1; |
| 612 | |
| 613 | /* app loop */ |
| 614 | for(;;) { |
| 615 | nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, timeout); |
| 616 | if (nfds == -1 && errno == EINTR) { |
| 617 | /* Caught signal */ |
| 618 | } else if (nfds == -1) { |
| 619 | PERROR("libustd_start_instance: epoll_wait failed"); |
| 620 | continue; |
| 621 | } |
| 622 | |
| 623 | for (i = 0; i < nfds; ++i) { |
| 624 | epoll_sock = (struct ustcomm_sock *)events[i].data.ptr; |
| 625 | if (epoll_sock == instance->listen_sock) { |
| 626 | addr_size = sizeof(struct sockaddr); |
| 627 | accept_fd = accept(epoll_sock->fd, |
| 628 | &addr, |
| 629 | (socklen_t *)&addr_size); |
| 630 | if (accept_fd == -1) { |
| 631 | PERROR("libustd_start_instance: " |
| 632 | "accept failed"); |
| 633 | continue; |
| 634 | } |
| 635 | ustcomm_init_sock(accept_fd, epoll_fd, |
| 636 | &instance->connections); |
| 637 | } else { |
| 638 | char *msg = NULL; |
| 639 | result = recv_message_conn(epoll_sock->fd, &msg); |
| 640 | if (result == 0) { |
| 641 | ustcomm_del_sock(epoll_sock, 0); |
| 642 | } else if (msg) { |
| 643 | process_client_cmd(msg, instance); |
| 644 | free(msg); |
| 645 | } |
| 646 | |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | if (instance->quit_program) { |
| 651 | pthread_mutex_lock(&instance->mutex); |
| 652 | if(instance->active_buffers == 0) { |
| 653 | pthread_mutex_unlock(&instance->mutex); |
| 654 | break; |
| 655 | } |
| 656 | pthread_mutex_unlock(&instance->mutex); |
| 657 | timeout = 100; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | if(instance->callbacks->on_trace_end) |
| 662 | instance->callbacks->on_trace_end(instance); |
| 663 | |
| 664 | libustd_delete_instance(instance); |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | /* FIXME: threads and connections !? */ |
| 670 | void libustd_delete_instance(struct libustd_instance *instance) |
| 671 | { |
| 672 | if (instance->is_init) { |
| 673 | ustcomm_del_named_sock(instance->listen_sock, 0); |
| 674 | close(instance->epoll_fd); |
| 675 | } |
| 676 | |
| 677 | pthread_mutex_destroy(&instance->mutex); |
| 678 | free(instance->sock_path); |
| 679 | free(instance); |
| 680 | } |
| 681 | |
| 682 | int libustd_stop_instance(struct libustd_instance *instance, int send_msg) |
| 683 | { |
| 684 | int result; |
| 685 | int fd; |
| 686 | int bytes = 0; |
| 687 | |
| 688 | char msg[] = "exit"; |
| 689 | |
| 690 | instance->quit_program = 1; |
| 691 | |
| 692 | if(!send_msg) |
| 693 | return 0; |
| 694 | |
| 695 | /* Send a message through the socket to force poll to return */ |
| 696 | |
| 697 | struct sockaddr_un addr; |
| 698 | |
| 699 | result = fd = socket(PF_UNIX, SOCK_STREAM, 0); |
| 700 | if(result == -1) { |
| 701 | PERROR("socket"); |
| 702 | return 1; |
| 703 | } |
| 704 | |
| 705 | addr.sun_family = AF_UNIX; |
| 706 | |
| 707 | strncpy(addr.sun_path, instance->sock_path, UNIX_PATH_MAX); |
| 708 | addr.sun_path[UNIX_PATH_MAX-1] = '\0'; |
| 709 | |
| 710 | result = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); |
| 711 | if(result == -1) { |
| 712 | PERROR("connect"); |
| 713 | } |
| 714 | |
| 715 | while(bytes != sizeof(msg)) |
| 716 | bytes += send(fd, msg, sizeof(msg), 0); |
| 717 | |
| 718 | close(fd); |
| 719 | |
| 720 | return 0; |
| 721 | } |
| 722 | |
| 723 | struct libustd_instance |
| 724 | *libustd_new_instance(struct libustd_callbacks *callbacks, |
| 725 | char *sock_path) |
| 726 | { |
| 727 | struct libustd_instance *instance = |
| 728 | zmalloc(sizeof(struct libustd_instance)); |
| 729 | if(!instance) { |
| 730 | return NULL; |
| 731 | } |
| 732 | |
| 733 | instance->callbacks = callbacks; |
| 734 | instance->quit_program = 0; |
| 735 | instance->is_init = 0; |
| 736 | instance->active_buffers = 0; |
| 737 | pthread_mutex_init(&instance->mutex, NULL); |
| 738 | |
| 739 | if (sock_path) { |
| 740 | instance->sock_path = strdup(sock_path); |
| 741 | } else { |
| 742 | instance->sock_path = NULL; |
| 743 | } |
| 744 | |
| 745 | return instance; |
| 746 | } |
| 747 | |
| 748 | static int init_ustd_socket(struct libustd_instance *instance) |
| 749 | { |
| 750 | char *name; |
| 751 | |
| 752 | if (instance->sock_path) { |
| 753 | if (asprintf(&name, "%s", instance->sock_path) < 0) { |
| 754 | ERR("ustcomm_init_ustd : asprintf failed (sock_path %s)", |
| 755 | instance->sock_path); |
| 756 | return -1; |
| 757 | } |
| 758 | } else { |
| 759 | int result; |
| 760 | |
| 761 | /* Only check if socket dir exists if we are using the default directory */ |
| 762 | result = ensure_dir_exists(SOCK_DIR); |
| 763 | if (result == -1) { |
| 764 | ERR("Unable to create socket directory %s", SOCK_DIR); |
| 765 | return -1; |
| 766 | } |
| 767 | |
| 768 | if (asprintf(&name, "%s/%s", SOCK_DIR, "ustd") < 0) { |
| 769 | ERR("ustcomm_init_ustd : asprintf failed (%s/ustd)", |
| 770 | SOCK_DIR); |
| 771 | return -1; |
| 772 | } |
| 773 | } |
| 774 | |
| 775 | /* Set up epoll */ |
| 776 | instance->epoll_fd = epoll_create(MAX_EVENTS); |
| 777 | if (instance->epoll_fd == -1) { |
| 778 | ERR("epoll_create failed, start instance bailing"); |
| 779 | goto free_name; |
| 780 | } |
| 781 | |
| 782 | /* Create the named socket */ |
| 783 | instance->listen_sock = ustcomm_init_named_socket(name, |
| 784 | instance->epoll_fd); |
| 785 | if(!instance->listen_sock) { |
| 786 | ERR("error initializing named socket at %s", name); |
| 787 | goto close_epoll; |
| 788 | } |
| 789 | |
| 790 | INIT_LIST_HEAD(&instance->connections); |
| 791 | |
| 792 | free(name); |
| 793 | |
| 794 | return 0; |
| 795 | |
| 796 | close_epoll: |
| 797 | close(instance->epoll_fd); |
| 798 | free_name: |
| 799 | free(name); |
| 800 | |
| 801 | return -1; |
| 802 | } |
| 803 | |
| 804 | int libustd_init_instance(struct libustd_instance *instance) |
| 805 | { |
| 806 | int result; |
| 807 | result = init_ustd_socket(instance); |
| 808 | if(result == -1) { |
| 809 | ERR("failed to initialize socket"); |
| 810 | return 1; |
| 811 | } |
| 812 | instance->is_init = 1; |
| 813 | return 0; |
| 814 | } |
| 815 | |