| 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/types.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/shm.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <unistd.h> |
| 26 | #include <signal.h> |
| 27 | |
| 28 | #include <stdlib.h> |
| 29 | #include <stdio.h> |
| 30 | #include <string.h> |
| 31 | #include <errno.h> |
| 32 | #include <assert.h> |
| 33 | #include <getopt.h> |
| 34 | |
| 35 | #include "ust/ustd.h" |
| 36 | #include "usterr.h" |
| 37 | |
| 38 | char *sock_path=NULL; |
| 39 | char *trace_path=NULL; |
| 40 | int daemon_mode = 0; |
| 41 | char *pidfile = NULL; |
| 42 | |
| 43 | struct libustd_instance *instance; |
| 44 | |
| 45 | struct buffer_info_local { |
| 46 | /* output file */ |
| 47 | int file_fd; |
| 48 | /* the offset we must truncate to, to unput the last subbuffer */ |
| 49 | off_t previous_offset; |
| 50 | }; |
| 51 | |
| 52 | static int write_pidfile(const char *file_name, pid_t pid) |
| 53 | { |
| 54 | FILE *pidfp; |
| 55 | |
| 56 | pidfp = fopen(file_name, "w"); |
| 57 | if(!pidfp) { |
| 58 | PERROR("fopen (%s)", file_name); |
| 59 | WARN("killing child process"); |
| 60 | return -1; |
| 61 | } |
| 62 | |
| 63 | fprintf(pidfp, "%d\n", pid); |
| 64 | |
| 65 | fclose(pidfp); |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | int create_dir_if_needed(char *dir) |
| 71 | { |
| 72 | int result; |
| 73 | result = mkdir(dir, 0777); |
| 74 | if(result == -1) { |
| 75 | if(errno != EEXIST) { |
| 76 | PERROR("mkdir"); |
| 77 | return -1; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | int unwrite_last_subbuffer(struct buffer_info *buf) |
| 85 | { |
| 86 | int result; |
| 87 | struct buffer_info_local *buf_local = buf->user_data; |
| 88 | |
| 89 | result = ftruncate(buf_local->file_fd, buf_local->previous_offset); |
| 90 | if(result == -1) { |
| 91 | PERROR("ftruncate"); |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | result = lseek(buf_local->file_fd, buf_local->previous_offset, SEEK_SET); |
| 96 | if(result == (int)(off_t)-1) { |
| 97 | PERROR("lseek"); |
| 98 | return -1; |
| 99 | } |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | int write_current_subbuffer(struct buffer_info *buf) |
| 105 | { |
| 106 | int result; |
| 107 | struct buffer_info_local *buf_local = buf->user_data; |
| 108 | |
| 109 | void *subbuf_mem = buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)); |
| 110 | |
| 111 | size_t cur_sb_size = subbuffer_data_size(subbuf_mem); |
| 112 | |
| 113 | off_t cur_offset = lseek(buf_local->file_fd, 0, SEEK_CUR); |
| 114 | if(cur_offset == (off_t)-1) { |
| 115 | PERROR("lseek"); |
| 116 | return -1; |
| 117 | } |
| 118 | |
| 119 | buf_local->previous_offset = cur_offset; |
| 120 | DBG("previous_offset: %ld", cur_offset); |
| 121 | |
| 122 | result = patient_write(buf_local->file_fd, subbuf_mem, cur_sb_size); |
| 123 | if(result == -1) { |
| 124 | PERROR("write"); |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | int on_read_subbuffer(struct libustd_callbacks *data, struct buffer_info *buf) |
| 132 | { |
| 133 | return write_current_subbuffer(buf); |
| 134 | } |
| 135 | |
| 136 | int on_read_partial_subbuffer(struct libustd_callbacks *data, struct buffer_info *buf, |
| 137 | long subbuf_index, unsigned long valid_length) |
| 138 | { |
| 139 | struct buffer_info_local *buf_local = buf->user_data; |
| 140 | char *tmp; |
| 141 | int result; |
| 142 | unsigned long pad_size; |
| 143 | |
| 144 | result = patient_write(buf_local->file_fd, buf->mem + subbuf_index * buf->subbuf_size, valid_length); |
| 145 | if(result == -1) { |
| 146 | ERR("Error writing to buffer file"); |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | /* pad with empty bytes */ |
| 151 | pad_size = PAGE_ALIGN(valid_length)-valid_length; |
| 152 | if(pad_size) { |
| 153 | tmp = zmalloc(pad_size); |
| 154 | result = patient_write(buf_local->file_fd, tmp, pad_size); |
| 155 | if(result == -1) { |
| 156 | ERR("Error writing to buffer file"); |
| 157 | return; |
| 158 | } |
| 159 | free(tmp); |
| 160 | } |
| 161 | |
| 162 | } |
| 163 | |
| 164 | int on_open_buffer(struct libustd_callbacks *data, struct buffer_info *buf) |
| 165 | { |
| 166 | char *tmp; |
| 167 | int result; |
| 168 | int fd; |
| 169 | struct buffer_info_local *buf_local = |
| 170 | zmalloc(sizeof(struct buffer_info_local)); |
| 171 | |
| 172 | if(!buf_local) { |
| 173 | ERR("could not allocate buffer_info_local struct"); |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | buf->user_data = buf_local; |
| 178 | |
| 179 | /* open file for output */ |
| 180 | if(!trace_path) { |
| 181 | /* Only create the directory if using the default path, because |
| 182 | * of the risk of typo when using trace path override. We don't |
| 183 | * want to risk creating plenty of useless directories in that case. |
| 184 | */ |
| 185 | result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH); |
| 186 | if(result == -1) { |
| 187 | ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH); |
| 188 | return 1; |
| 189 | } |
| 190 | |
| 191 | trace_path = USTD_DEFAULT_TRACE_PATH; |
| 192 | } |
| 193 | |
| 194 | if (asprintf(&tmp, "%s/%u_%lld", trace_path, buf->pid, buf->pidunique) < 0) { |
| 195 | ERR("on_open_buffer : asprintf failed (%s/%u_%lld)", |
| 196 | trace_path, buf->pid, buf->pidunique); |
| 197 | return 1; |
| 198 | } |
| 199 | result = create_dir_if_needed(tmp); |
| 200 | if(result == -1) { |
| 201 | ERR("could not create directory %s", tmp); |
| 202 | free(tmp); |
| 203 | return 1; |
| 204 | } |
| 205 | free(tmp); |
| 206 | |
| 207 | if (asprintf(&tmp, "%s/%u_%lld/%s", trace_path, buf->pid, buf->pidunique, buf->name) < 0) { |
| 208 | ERR("on_open_buffer : asprintf failed (%s/%u_%lld/%s)", |
| 209 | trace_path, buf->pid, buf->pidunique, buf->name); |
| 210 | return 1; |
| 211 | } |
| 212 | result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 00600); |
| 213 | if(result == -1) { |
| 214 | PERROR("open"); |
| 215 | ERR("failed opening trace file %s", tmp); |
| 216 | return 1; |
| 217 | } |
| 218 | buf_local->file_fd = fd; |
| 219 | free(tmp); |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | int on_close_buffer(struct libustd_callbacks *data, struct buffer_info *buf) |
| 225 | { |
| 226 | struct buffer_info_local *buf_local = buf->user_data; |
| 227 | int result = close(buf_local->file_fd); |
| 228 | free(buf_local); |
| 229 | if(result == -1) { |
| 230 | PERROR("close"); |
| 231 | } |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | int on_put_error(struct libustd_callbacks *data, struct buffer_info *buf) |
| 236 | { |
| 237 | unwrite_last_subbuffer(buf); |
| 238 | } |
| 239 | |
| 240 | struct libustd_callbacks *new_callbacks() |
| 241 | { |
| 242 | struct libustd_callbacks *callbacks = |
| 243 | zmalloc(sizeof(struct libustd_callbacks)); |
| 244 | |
| 245 | if(!callbacks) |
| 246 | return NULL; |
| 247 | |
| 248 | callbacks->on_open_buffer = on_open_buffer; |
| 249 | callbacks->on_close_buffer = on_close_buffer; |
| 250 | callbacks->on_read_subbuffer = on_read_subbuffer; |
| 251 | callbacks->on_read_partial_subbuffer = on_read_partial_subbuffer; |
| 252 | callbacks->on_put_error = on_put_error; |
| 253 | callbacks->on_new_thread = NULL; |
| 254 | callbacks->on_close_thread = NULL; |
| 255 | callbacks->on_trace_end = NULL; |
| 256 | |
| 257 | return callbacks; |
| 258 | |
| 259 | } |
| 260 | |
| 261 | int is_directory(const char *dir) |
| 262 | { |
| 263 | int result; |
| 264 | struct stat st; |
| 265 | |
| 266 | result = stat(dir, &st); |
| 267 | if(result == -1) { |
| 268 | PERROR("stat"); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | if(!S_ISDIR(st.st_mode)) { |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | return 1; |
| 277 | } |
| 278 | |
| 279 | void usage(void) |
| 280 | { |
| 281 | fprintf(stderr, "Usage:\nustd OPTIONS\n\nOptions:\n" |
| 282 | "\t-h\t\tDisplay this usage.\n" |
| 283 | "\t-o DIR\t\tSpecify the directory where to output the traces.\n" |
| 284 | "\t-s PATH\t\tSpecify the path to use for the daemon socket.\n" |
| 285 | "\t-d\t\tStart as a daemon.\n" |
| 286 | "\t--pidfile FILE\tWrite the PID in this file (when using -d).\n"); |
| 287 | } |
| 288 | |
| 289 | int parse_args(int argc, char **argv) |
| 290 | { |
| 291 | int c; |
| 292 | |
| 293 | while (1) { |
| 294 | int option_index = 0; |
| 295 | static struct option long_options[] = { |
| 296 | {"pidfile", 1, 0, 'p'}, |
| 297 | {"help", 0, 0, 'h'}, |
| 298 | {"version", 0, 0, 'V'}, |
| 299 | {0, 0, 0, 0} |
| 300 | }; |
| 301 | |
| 302 | c = getopt_long(argc, argv, "hs:o:d", long_options, &option_index); |
| 303 | if (c == -1) |
| 304 | break; |
| 305 | |
| 306 | switch (c) { |
| 307 | case 0: |
| 308 | printf("option %s", long_options[option_index].name); |
| 309 | if (optarg) |
| 310 | printf(" with arg %s", optarg); |
| 311 | printf("\n"); |
| 312 | break; |
| 313 | case 's': |
| 314 | sock_path = optarg; |
| 315 | break; |
| 316 | case 'o': |
| 317 | trace_path = optarg; |
| 318 | if(!is_directory(trace_path)) { |
| 319 | ERR("Not a valid directory. (%s)", trace_path); |
| 320 | return -1; |
| 321 | } |
| 322 | break; |
| 323 | case 'd': |
| 324 | daemon_mode = 1; |
| 325 | break; |
| 326 | case 'p': |
| 327 | pidfile = strdup(optarg); |
| 328 | break; |
| 329 | case 'h': |
| 330 | usage(); |
| 331 | exit(0); |
| 332 | case 'V': |
| 333 | printf("Version 0.0\n"); |
| 334 | break; |
| 335 | |
| 336 | default: |
| 337 | /* unknown option or other error; error is |
| 338 | printed by getopt, just return */ |
| 339 | return -1; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | void sigterm_handler(int sig) |
| 347 | { |
| 348 | libustd_stop_instance(instance, 0); |
| 349 | } |
| 350 | |
| 351 | int start_ustd(int fd) |
| 352 | { |
| 353 | int result; |
| 354 | sigset_t sigset; |
| 355 | struct sigaction sa; |
| 356 | |
| 357 | struct libustd_callbacks *callbacks = new_callbacks(); |
| 358 | if(!callbacks) { |
| 359 | PERROR("new_callbacks"); |
| 360 | return 1; |
| 361 | } |
| 362 | |
| 363 | result = sigemptyset(&sigset); |
| 364 | if(result == -1) { |
| 365 | PERROR("sigemptyset"); |
| 366 | return 1; |
| 367 | } |
| 368 | sa.sa_handler = sigterm_handler; |
| 369 | sa.sa_mask = sigset; |
| 370 | sa.sa_flags = 0; |
| 371 | result = sigaction(SIGTERM, &sa, NULL); |
| 372 | if(result == -1) { |
| 373 | PERROR("sigaction"); |
| 374 | return 1; |
| 375 | } |
| 376 | result = sigaction(SIGINT, &sa, NULL); |
| 377 | if(result == -1) { |
| 378 | PERROR("sigaction"); |
| 379 | return 1; |
| 380 | } |
| 381 | |
| 382 | instance = libustd_new_instance(callbacks, sock_path); |
| 383 | if(!instance) { |
| 384 | ERR("failed to create libustd instance"); |
| 385 | return 1; |
| 386 | } |
| 387 | |
| 388 | result = libustd_init_instance(instance); |
| 389 | if(result) { |
| 390 | ERR("failed to initialize libustd instance"); |
| 391 | return 1; |
| 392 | } |
| 393 | |
| 394 | /* setup handler for SIGPIPE */ |
| 395 | result = sigemptyset(&sigset); |
| 396 | if(result == -1) { |
| 397 | PERROR("sigemptyset"); |
| 398 | return 1; |
| 399 | } |
| 400 | result = sigaddset(&sigset, SIGPIPE); |
| 401 | if(result == -1) { |
| 402 | PERROR("sigaddset"); |
| 403 | return 1; |
| 404 | } |
| 405 | result = sigprocmask(SIG_BLOCK, &sigset, NULL); |
| 406 | if(result == -1) { |
| 407 | PERROR("sigprocmask"); |
| 408 | return 1; |
| 409 | } |
| 410 | |
| 411 | /* Write pidfile */ |
| 412 | if(pidfile) { |
| 413 | result = write_pidfile(pidfile, getpid()); |
| 414 | if(result == -1) { |
| 415 | ERR("failed to write pidfile"); |
| 416 | return 1; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | /* Notify parent that we are successfully started. */ |
| 421 | if(fd != -1) { |
| 422 | /* write any one character */ |
| 423 | result = write(fd, "!", 1); |
| 424 | if(result == -1) { |
| 425 | PERROR("write"); |
| 426 | return -1; |
| 427 | } |
| 428 | if(result != 1) { |
| 429 | ERR("Problem sending confirmation of daemon start to parent"); |
| 430 | return -1; |
| 431 | } |
| 432 | result = close(fd); |
| 433 | if(result == -1) { |
| 434 | PERROR("close"); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | libustd_start_instance(instance); |
| 439 | |
| 440 | free(callbacks); |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | int start_ustd_daemon() |
| 446 | { |
| 447 | int result; |
| 448 | int fd[2]; |
| 449 | pid_t child_pid; |
| 450 | |
| 451 | result = pipe(fd); |
| 452 | |
| 453 | result = child_pid = fork(); |
| 454 | if(result == -1) { |
| 455 | PERROR("fork"); |
| 456 | return -1; |
| 457 | } |
| 458 | else if(result == 0) { |
| 459 | return start_ustd(fd[1]); |
| 460 | } |
| 461 | else { |
| 462 | char buf; |
| 463 | |
| 464 | result = read(fd[0], &buf, 1); |
| 465 | if(result == -1) { |
| 466 | PERROR("read"); |
| 467 | return -1; |
| 468 | } |
| 469 | if(result != 1) { |
| 470 | ERR("did not receive valid confirmation that the daemon is started"); |
| 471 | return -1; |
| 472 | } |
| 473 | |
| 474 | result = close(fd[0]); |
| 475 | if(result == -1) { |
| 476 | PERROR("close"); |
| 477 | } |
| 478 | |
| 479 | DBG("The daemon is now successfully started"); |
| 480 | } |
| 481 | |
| 482 | /* Wait for confirmation that the server is ready. */ |
| 483 | |
| 484 | |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | int main(int argc, char **argv) |
| 489 | { |
| 490 | int result; |
| 491 | |
| 492 | result = parse_args(argc, argv); |
| 493 | if(result == -1) { |
| 494 | exit(1); |
| 495 | } |
| 496 | |
| 497 | if(daemon_mode) { |
| 498 | result = start_ustd_daemon(); |
| 499 | } |
| 500 | else { |
| 501 | result = start_ustd(-1); |
| 502 | } |
| 503 | |
| 504 | return result; |
| 505 | } |