| 464 | |
| 465 | # if defined(USE_ASYNC) |
| 466 | static |
| 467 | int run_async(struct mad_decoder *decoder) |
| 468 | { |
| 469 | pid_t pid; |
| 470 | int ptoc[2], ctop[2], flags; |
| 471 | |
| 472 | if (pipe(ptoc) == -1) |
| 473 | return -1; |
| 474 | |
| 475 | if (pipe(ctop) == -1) { |
| 476 | close(ptoc[0]); |
| 477 | close(ptoc[1]); |
| 478 | return -1; |
| 479 | } |
| 480 | |
| 481 | flags = fcntl(ptoc[0], F_GETFL); |
| 482 | if (flags == -1 || |
| 483 | fcntl(ptoc[0], F_SETFL, flags | O_NONBLOCK) == -1) { |
| 484 | close(ctop[0]); |
| 485 | close(ctop[1]); |
| 486 | close(ptoc[0]); |
| 487 | close(ptoc[1]); |
| 488 | return -1; |
| 489 | } |
| 490 | |
| 491 | pid = fork(); |
| 492 | if (pid == -1) { |
| 493 | close(ctop[0]); |
| 494 | close(ctop[1]); |
| 495 | close(ptoc[0]); |
| 496 | close(ptoc[1]); |
| 497 | return -1; |
| 498 | } |
| 499 | |
| 500 | decoder->async.pid = pid; |
| 501 | |
| 502 | if (pid) { |
| 503 | /* parent */ |
| 504 | |
| 505 | close(ptoc[0]); |
| 506 | close(ctop[1]); |
| 507 | |
| 508 | decoder->async.in = ctop[0]; |
| 509 | decoder->async.out = ptoc[1]; |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | /* child */ |
| 515 | |
| 516 | close(ptoc[1]); |
| 517 | close(ctop[0]); |
| 518 | |
| 519 | decoder->async.in = ptoc[0]; |
| 520 | decoder->async.out = ctop[1]; |
| 521 | |
| 522 | _exit(run_sync(decoder)); |
| 523 | |