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[ThirdParty] Added libuv
author June Park <parkjune1995@gmail.com>
date Wed, 14 Jan 2026 19:39:52 -0800
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159:05cf9467a1c3 160:948de3f54cea
1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #include "uv.h"
23 #include "internal.h"
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <assert.h>
29 #include <errno.h>
30
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <sys/uio.h>
34 #include <sys/un.h>
35 #include <unistd.h>
36 #include <limits.h> /* IOV_MAX */
37
38 #if defined(__APPLE__)
39 # include <sys/event.h>
40 # include <sys/time.h>
41 # include <sys/select.h>
42
43 /* Forward declaration */
44 typedef struct uv__stream_select_s uv__stream_select_t;
45
46 struct uv__stream_select_s {
47 uv_stream_t* stream;
48 uv_thread_t thread;
49 uv_sem_t close_sem;
50 uv_sem_t async_sem;
51 uv_async_t async;
52 int events;
53 int fake_fd;
54 int int_fd;
55 int fd;
56 fd_set* sread;
57 size_t sread_sz;
58 fd_set* swrite;
59 size_t swrite_sz;
60 };
61 #endif /* defined(__APPLE__) */
62
63 union uv__cmsg {
64 struct cmsghdr hdr;
65 /* This cannot be larger because of the IBMi PASE limitation that
66 * the total size of control messages cannot exceed 256 bytes.
67 */
68 char pad[256];
69 };
70
71 STATIC_ASSERT(256 == sizeof(union uv__cmsg));
72
73 static void uv__stream_connect(uv_stream_t*);
74 static void uv__write(uv_stream_t* stream);
75 static void uv__read(uv_stream_t* stream);
76 static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events);
77 static void uv__write_callbacks(uv_stream_t* stream);
78 static size_t uv__write_req_size(uv_write_t* req);
79 static void uv__drain(uv_stream_t* stream);
80
81
82 void uv__stream_init(uv_loop_t* loop,
83 uv_stream_t* stream,
84 uv_handle_type type) {
85 int err;
86
87 uv__handle_init(loop, (uv_handle_t*)stream, type);
88 stream->read_cb = NULL;
89 stream->alloc_cb = NULL;
90 stream->close_cb = NULL;
91 stream->connection_cb = NULL;
92 stream->connect_req = NULL;
93 stream->shutdown_req = NULL;
94 stream->accepted_fd = -1;
95 stream->queued_fds = NULL;
96 stream->delayed_error = 0;
97 uv__queue_init(&stream->write_queue);
98 uv__queue_init(&stream->write_completed_queue);
99 stream->write_queue_size = 0;
100
101 if (loop->emfile_fd == -1) {
102 err = uv__open_cloexec("/dev/null", O_RDONLY);
103 if (err < 0)
104 /* In the rare case that "/dev/null" isn't mounted open "/"
105 * instead.
106 */
107 err = uv__open_cloexec("/", O_RDONLY);
108 if (err >= 0)
109 loop->emfile_fd = err;
110 }
111
112 #if defined(__APPLE__)
113 stream->select = NULL;
114 #endif /* defined(__APPLE_) */
115
116 uv__io_init(&stream->io_watcher, uv__stream_io, -1);
117 }
118
119
120 static void uv__stream_osx_interrupt_select(uv_stream_t* stream) {
121 #if defined(__APPLE__)
122 /* Notify select() thread about state change */
123 uv__stream_select_t* s;
124 int r;
125
126 s = stream->select;
127 if (s == NULL)
128 return;
129
130 /* Interrupt select() loop
131 * NOTE: fake_fd and int_fd are socketpair(), thus writing to one will
132 * emit read event on other side
133 */
134 do
135 r = write(s->fake_fd, "x", 1);
136 while (r == -1 && errno == EINTR);
137
138 assert(r == 1);
139 #else /* !defined(__APPLE__) */
140 /* No-op on any other platform */
141 #endif /* !defined(__APPLE__) */
142 }
143
144
145 #if defined(__APPLE__)
146 static void uv__stream_osx_select(void* arg) {
147 uv_stream_t* stream;
148 uv__stream_select_t* s;
149 char buf[1024];
150 int events;
151 int fd;
152 int r;
153 int max_fd;
154
155 stream = arg;
156 s = stream->select;
157 fd = s->fd;
158
159 if (fd > s->int_fd)
160 max_fd = fd;
161 else
162 max_fd = s->int_fd;
163
164 for (;;) {
165 /* Terminate on semaphore */
166 if (uv_sem_trywait(&s->close_sem) == 0)
167 break;
168
169 /* Watch fd using select(2) */
170 memset(s->sread, 0, s->sread_sz);
171 memset(s->swrite, 0, s->swrite_sz);
172
173 if (uv__io_active(&stream->io_watcher, POLLIN))
174 FD_SET(fd, s->sread);
175 if (uv__io_active(&stream->io_watcher, POLLOUT))
176 FD_SET(fd, s->swrite);
177 FD_SET(s->int_fd, s->sread);
178
179 /* Wait indefinitely for fd events */
180 r = select(max_fd + 1, s->sread, s->swrite, NULL, NULL);
181 if (r == -1) {
182 if (errno == EINTR)
183 continue;
184
185 /* XXX: Possible?! */
186 abort();
187 }
188
189 /* Ignore timeouts */
190 if (r == 0)
191 continue;
192
193 /* Empty socketpair's buffer in case of interruption */
194 if (FD_ISSET(s->int_fd, s->sread))
195 for (;;) {
196 r = read(s->int_fd, buf, sizeof(buf));
197
198 if (r == sizeof(buf))
199 continue;
200
201 if (r != -1)
202 break;
203
204 if (errno == EAGAIN || errno == EWOULDBLOCK)
205 break;
206
207 if (errno == EINTR)
208 continue;
209
210 abort();
211 }
212
213 /* Handle events */
214 events = 0;
215 if (FD_ISSET(fd, s->sread))
216 events |= POLLIN;
217 if (FD_ISSET(fd, s->swrite))
218 events |= POLLOUT;
219
220 assert(events != 0 || FD_ISSET(s->int_fd, s->sread));
221 if (events != 0) {
222 ACCESS_ONCE(int, s->events) = events;
223
224 uv_async_send(&s->async);
225 uv_sem_wait(&s->async_sem);
226
227 /* Should be processed at this stage */
228 assert((s->events == 0) || (stream->flags & UV_HANDLE_CLOSING));
229 }
230 }
231 }
232
233
234 static void uv__stream_osx_select_cb(uv_async_t* handle) {
235 uv__stream_select_t* s;
236 uv_stream_t* stream;
237 int events;
238
239 s = container_of(handle, uv__stream_select_t, async);
240 stream = s->stream;
241
242 /* Get and reset stream's events */
243 events = s->events;
244 ACCESS_ONCE(int, s->events) = 0;
245
246 assert(events != 0);
247 assert(events == (events & (POLLIN | POLLOUT)));
248
249 /* Invoke callback on event-loop */
250 if ((events & POLLIN) && uv__io_active(&stream->io_watcher, POLLIN))
251 uv__stream_io(stream->loop, &stream->io_watcher, POLLIN);
252
253 if ((events & POLLOUT) && uv__io_active(&stream->io_watcher, POLLOUT))
254 uv__stream_io(stream->loop, &stream->io_watcher, POLLOUT);
255
256 if (stream->flags & UV_HANDLE_CLOSING)
257 return;
258
259 /* NOTE: It is important to do it here, otherwise `select()` might be called
260 * before the actual `uv__read()`, leading to the blocking syscall
261 */
262 uv_sem_post(&s->async_sem);
263 }
264
265
266 static void uv__stream_osx_cb_close(uv_handle_t* async) {
267 uv__stream_select_t* s;
268
269 s = container_of(async, uv__stream_select_t, async);
270 uv__free(s);
271 }
272
273
274 int uv__stream_try_select(uv_stream_t* stream, int* fd) {
275 /*
276 * kqueue doesn't work with some files from /dev mount on osx.
277 * select(2) in separate thread for those fds
278 */
279
280 struct kevent filter[1];
281 struct kevent events[1];
282 struct timespec timeout;
283 uv__stream_select_t* s;
284 int fds[2];
285 int err;
286 int ret;
287 int kq;
288 int old_fd;
289 int max_fd;
290 size_t sread_sz;
291 size_t swrite_sz;
292
293 kq = kqueue();
294 if (kq == -1) {
295 perror("(libuv) kqueue()");
296 return UV__ERR(errno);
297 }
298
299 EV_SET(&filter[0], *fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 0);
300
301 /* Use small timeout, because we only want to capture EINVALs */
302 timeout.tv_sec = 0;
303 timeout.tv_nsec = 1;
304
305 do
306 ret = kevent(kq, filter, 1, events, 1, &timeout);
307 while (ret == -1 && errno == EINTR);
308
309 uv__close(kq);
310
311 if (ret == -1)
312 return UV__ERR(errno);
313
314 if (ret == 0 || (events[0].flags & EV_ERROR) == 0 || events[0].data != EINVAL)
315 return 0;
316
317 /* At this point we definitely know that this fd won't work with kqueue */
318
319 /*
320 * Create fds for io watcher and to interrupt the select() loop.
321 * NOTE: do it ahead of malloc below to allocate enough space for fd_sets
322 */
323 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
324 return UV__ERR(errno);
325
326 max_fd = *fd;
327 if (fds[1] > max_fd)
328 max_fd = fds[1];
329
330 sread_sz = ROUND_UP(max_fd + 1, sizeof(uint32_t) * NBBY) / NBBY;
331 swrite_sz = sread_sz;
332
333 s = uv__malloc(sizeof(*s) + sread_sz + swrite_sz);
334 if (s == NULL) {
335 err = UV_ENOMEM;
336 goto failed_malloc;
337 }
338
339 s->events = 0;
340 s->fd = *fd;
341 s->sread = (fd_set*) ((char*) s + sizeof(*s));
342 s->sread_sz = sread_sz;
343 s->swrite = (fd_set*) ((char*) s->sread + sread_sz);
344 s->swrite_sz = swrite_sz;
345
346 err = uv_async_init(stream->loop, &s->async, uv__stream_osx_select_cb);
347 if (err)
348 goto failed_async_init;
349
350 s->async.flags |= UV_HANDLE_INTERNAL;
351 uv__handle_unref(&s->async);
352
353 err = uv_sem_init(&s->close_sem, 0);
354 if (err != 0)
355 goto failed_close_sem_init;
356
357 err = uv_sem_init(&s->async_sem, 0);
358 if (err != 0)
359 goto failed_async_sem_init;
360
361 s->fake_fd = fds[0];
362 s->int_fd = fds[1];
363
364 old_fd = *fd;
365 s->stream = stream;
366 stream->select = s;
367 *fd = s->fake_fd;
368
369 err = uv_thread_create(&s->thread, uv__stream_osx_select, stream);
370 if (err != 0)
371 goto failed_thread_create;
372
373 return 0;
374
375 failed_thread_create:
376 s->stream = NULL;
377 stream->select = NULL;
378 *fd = old_fd;
379
380 uv_sem_destroy(&s->async_sem);
381
382 failed_async_sem_init:
383 uv_sem_destroy(&s->close_sem);
384
385 failed_close_sem_init:
386 uv__close(fds[0]);
387 uv__close(fds[1]);
388 uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close);
389 return err;
390
391 failed_async_init:
392 uv__free(s);
393
394 failed_malloc:
395 uv__close(fds[0]);
396 uv__close(fds[1]);
397
398 return err;
399 }
400 #endif /* defined(__APPLE__) */
401
402
403 int uv__stream_open(uv_stream_t* stream, int fd, int flags) {
404 #if defined(__APPLE__)
405 int enable;
406 #endif
407
408 if (!(stream->io_watcher.fd == -1 || stream->io_watcher.fd == fd))
409 return UV_EBUSY;
410
411 assert(fd >= 0);
412 stream->flags |= flags;
413
414 if (stream->type == UV_TCP) {
415 if ((stream->flags & UV_HANDLE_TCP_NODELAY) && uv__tcp_nodelay(fd, 1))
416 return UV__ERR(errno);
417
418 /* TODO Use delay the user passed in. */
419 if ((stream->flags & UV_HANDLE_TCP_KEEPALIVE) &&
420 uv__tcp_keepalive(fd, 1, 60)) {
421 return UV__ERR(errno);
422 }
423 }
424
425 #if defined(__APPLE__)
426 enable = 1;
427 if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &enable, sizeof(enable)) &&
428 errno != ENOTSOCK &&
429 errno != EINVAL) {
430 return UV__ERR(errno);
431 }
432 #endif
433
434 stream->io_watcher.fd = fd;
435
436 return 0;
437 }
438
439
440 void uv__stream_flush_write_queue(uv_stream_t* stream, int error) {
441 uv_write_t* req;
442 struct uv__queue* q;
443 while (!uv__queue_empty(&stream->write_queue)) {
444 q = uv__queue_head(&stream->write_queue);
445 uv__queue_remove(q);
446
447 req = uv__queue_data(q, uv_write_t, queue);
448 req->error = error;
449
450 uv__queue_insert_tail(&stream->write_completed_queue, &req->queue);
451 }
452 }
453
454
455 void uv__stream_destroy(uv_stream_t* stream) {
456 assert(!uv__io_active(&stream->io_watcher, POLLIN | POLLOUT));
457 assert(stream->flags & UV_HANDLE_CLOSED);
458
459 if (stream->connect_req) {
460 uv__req_unregister(stream->loop);
461 stream->connect_req->cb(stream->connect_req, UV_ECANCELED);
462 stream->connect_req = NULL;
463 }
464
465 uv__stream_flush_write_queue(stream, UV_ECANCELED);
466 uv__write_callbacks(stream);
467 uv__drain(stream);
468
469 assert(stream->write_queue_size == 0);
470 }
471
472
473 /* Implements a best effort approach to mitigating accept() EMFILE errors.
474 * We have a spare file descriptor stashed away that we close to get below
475 * the EMFILE limit. Next, we accept all pending connections and close them
476 * immediately to signal the clients that we're overloaded - and we are, but
477 * we still keep on trucking.
478 *
479 * There is one caveat: it's not reliable in a multi-threaded environment.
480 * The file descriptor limit is per process. Our party trick fails if another
481 * thread opens a file or creates a socket in the time window between us
482 * calling close() and accept().
483 */
484 static int uv__emfile_trick(uv_loop_t* loop, int accept_fd) {
485 int err;
486 int emfile_fd;
487
488 if (loop->emfile_fd == -1)
489 return UV_EMFILE;
490
491 uv__close(loop->emfile_fd);
492 loop->emfile_fd = -1;
493
494 do {
495 err = uv__accept(accept_fd);
496 if (err >= 0)
497 uv__close(err);
498 } while (err >= 0 || err == UV_EINTR);
499
500 emfile_fd = uv__open_cloexec("/", O_RDONLY);
501 if (emfile_fd >= 0)
502 loop->emfile_fd = emfile_fd;
503
504 return err;
505 }
506
507
508 void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
509 uv_stream_t* stream;
510 int err;
511 int fd;
512
513 stream = container_of(w, uv_stream_t, io_watcher);
514 assert(events & POLLIN);
515 assert(stream->accepted_fd == -1);
516 assert(!(stream->flags & UV_HANDLE_CLOSING));
517
518 fd = uv__stream_fd(stream);
519 err = uv__accept(fd);
520
521 if (err == UV_EMFILE || err == UV_ENFILE)
522 err = uv__emfile_trick(loop, fd); /* Shed load. */
523
524 if (err < 0)
525 return;
526
527 stream->accepted_fd = err;
528 stream->connection_cb(stream, 0);
529
530 if (stream->accepted_fd != -1)
531 /* The user hasn't yet accepted called uv_accept() */
532 uv__io_stop(loop, &stream->io_watcher, POLLIN);
533 }
534
535
536 int uv_accept(uv_stream_t* server, uv_stream_t* client) {
537 int err;
538
539 assert(server->loop == client->loop);
540
541 if (server->accepted_fd == -1)
542 return UV_EAGAIN;
543
544 switch (client->type) {
545 case UV_NAMED_PIPE:
546 case UV_TCP:
547 err = uv__stream_open(client,
548 server->accepted_fd,
549 UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
550 if (err) {
551 /* TODO handle error */
552 uv__close(server->accepted_fd);
553 goto done;
554 }
555 break;
556
557 case UV_UDP:
558 err = uv_udp_open((uv_udp_t*) client, server->accepted_fd);
559 if (err) {
560 uv__close(server->accepted_fd);
561 goto done;
562 }
563 break;
564
565 default:
566 return UV_EINVAL;
567 }
568
569 client->flags |= UV_HANDLE_BOUND;
570
571 done:
572 /* Process queued fds */
573 if (server->queued_fds != NULL) {
574 uv__stream_queued_fds_t* queued_fds;
575
576 queued_fds = server->queued_fds;
577
578 /* Read first */
579 server->accepted_fd = queued_fds->fds[0];
580
581 /* All read, free */
582 assert(queued_fds->offset > 0);
583 if (--queued_fds->offset == 0) {
584 uv__free(queued_fds);
585 server->queued_fds = NULL;
586 } else {
587 /* Shift rest */
588 memmove(queued_fds->fds,
589 queued_fds->fds + 1,
590 queued_fds->offset * sizeof(*queued_fds->fds));
591 }
592 } else {
593 server->accepted_fd = -1;
594 if (err == 0)
595 uv__io_start(server->loop, &server->io_watcher, POLLIN);
596 }
597 return err;
598 }
599
600
601 int uv_listen(uv_stream_t* stream, int backlog, uv_connection_cb cb) {
602 int err;
603 if (uv__is_closing(stream)) {
604 return UV_EINVAL;
605 }
606 switch (stream->type) {
607 case UV_TCP:
608 err = uv__tcp_listen((uv_tcp_t*)stream, backlog, cb);
609 break;
610
611 case UV_NAMED_PIPE:
612 err = uv__pipe_listen((uv_pipe_t*)stream, backlog, cb);
613 break;
614
615 default:
616 err = UV_EINVAL;
617 }
618
619 if (err == 0)
620 uv__handle_start(stream);
621
622 return err;
623 }
624
625
626 static void uv__drain(uv_stream_t* stream) {
627 uv_shutdown_t* req;
628 int err;
629
630 assert(uv__queue_empty(&stream->write_queue));
631 if (!(stream->flags & UV_HANDLE_CLOSING)) {
632 uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
633 uv__stream_osx_interrupt_select(stream);
634 }
635
636 if (!uv__is_stream_shutting(stream))
637 return;
638
639 req = stream->shutdown_req;
640 assert(req);
641
642 if ((stream->flags & UV_HANDLE_CLOSING) ||
643 !(stream->flags & UV_HANDLE_SHUT)) {
644 stream->shutdown_req = NULL;
645 uv__req_unregister(stream->loop);
646
647 err = 0;
648 if (stream->flags & UV_HANDLE_CLOSING)
649 /* The user destroyed the stream before we got to do the shutdown. */
650 err = UV_ECANCELED;
651 else if (shutdown(uv__stream_fd(stream), SHUT_WR))
652 err = UV__ERR(errno);
653 else /* Success. */
654 stream->flags |= UV_HANDLE_SHUT;
655
656 if (req->cb != NULL)
657 req->cb(req, err);
658 }
659 }
660
661
662 static ssize_t uv__writev(int fd, struct iovec* vec, size_t n) {
663 if (n == 1)
664 return write(fd, vec->iov_base, vec->iov_len);
665 else
666 return writev(fd, vec, n);
667 }
668
669
670 static size_t uv__write_req_size(uv_write_t* req) {
671 size_t size;
672
673 assert(req->bufs != NULL);
674 size = uv__count_bufs(req->bufs + req->write_index,
675 req->nbufs - req->write_index);
676 assert(req->handle->write_queue_size >= size);
677
678 return size;
679 }
680
681
682 /* Returns 1 if all write request data has been written, or 0 if there is still
683 * more data to write.
684 *
685 * Note: the return value only says something about the *current* request.
686 * There may still be other write requests sitting in the queue.
687 */
688 static int uv__write_req_update(uv_stream_t* stream,
689 uv_write_t* req,
690 size_t n) {
691 uv_buf_t* buf;
692 size_t len;
693
694 assert(n <= stream->write_queue_size);
695 stream->write_queue_size -= n;
696
697 buf = req->bufs + req->write_index;
698
699 do {
700 len = n < buf->len ? n : buf->len;
701 if (buf->len != 0)
702 buf->base += len;
703 buf->len -= len;
704 buf += (buf->len == 0); /* Advance to next buffer if this one is empty. */
705 n -= len;
706 } while (n > 0);
707
708 req->write_index = buf - req->bufs;
709
710 return req->write_index == req->nbufs;
711 }
712
713
714 static void uv__write_req_finish(uv_write_t* req) {
715 uv_stream_t* stream = req->handle;
716
717 /* Pop the req off tcp->write_queue. */
718 uv__queue_remove(&req->queue);
719
720 /* Only free when there was no error. On error, we touch up write_queue_size
721 * right before making the callback. The reason we don't do that right away
722 * is that a write_queue_size > 0 is our only way to signal to the user that
723 * they should stop writing - which they should if we got an error. Something
724 * to revisit in future revisions of the libuv API.
725 */
726 if (req->error == 0) {
727 if (req->bufs != req->bufsml)
728 uv__free(req->bufs);
729 req->bufs = NULL;
730 }
731
732 /* Add it to the write_completed_queue where it will have its
733 * callback called in the near future.
734 */
735 uv__queue_insert_tail(&stream->write_completed_queue, &req->queue);
736 uv__io_feed(stream->loop, &stream->io_watcher);
737 }
738
739
740 static int uv__handle_fd(uv_handle_t* handle) {
741 switch (handle->type) {
742 case UV_NAMED_PIPE:
743 case UV_TCP:
744 return ((uv_stream_t*) handle)->io_watcher.fd;
745
746 case UV_UDP:
747 return ((uv_udp_t*) handle)->io_watcher.fd;
748
749 default:
750 return -1;
751 }
752 }
753
754 static int uv__try_write(uv_stream_t* stream,
755 const uv_buf_t bufs[],
756 unsigned int nbufs,
757 uv_stream_t* send_handle) {
758 struct iovec* iov;
759 int iovmax;
760 int iovcnt;
761 ssize_t n;
762
763 /*
764 * Cast to iovec. We had to have our own uv_buf_t instead of iovec
765 * because Windows's WSABUF is not an iovec.
766 */
767 iov = (struct iovec*) bufs;
768 iovcnt = nbufs;
769
770 iovmax = uv__getiovmax();
771
772 /* Limit iov count to avoid EINVALs from writev() */
773 if (iovcnt > iovmax)
774 iovcnt = iovmax;
775
776 /*
777 * Now do the actual writev. Note that we've been updating the pointers
778 * inside the iov each time we write. So there is no need to offset it.
779 */
780 if (send_handle != NULL) {
781 int fd_to_send;
782 struct msghdr msg;
783 union uv__cmsg cmsg;
784
785 if (uv__is_closing(send_handle))
786 return UV_EBADF;
787
788 fd_to_send = uv__handle_fd((uv_handle_t*) send_handle);
789
790 memset(&cmsg, 0, sizeof(cmsg));
791
792 assert(fd_to_send >= 0);
793
794 msg.msg_name = NULL;
795 msg.msg_namelen = 0;
796 msg.msg_iov = iov;
797 msg.msg_iovlen = iovcnt;
798 msg.msg_flags = 0;
799
800 msg.msg_control = &cmsg.hdr;
801 msg.msg_controllen = CMSG_SPACE(sizeof(fd_to_send));
802
803 cmsg.hdr.cmsg_level = SOL_SOCKET;
804 cmsg.hdr.cmsg_type = SCM_RIGHTS;
805 cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(fd_to_send));
806 memcpy(CMSG_DATA(&cmsg.hdr), &fd_to_send, sizeof(fd_to_send));
807
808 do
809 n = sendmsg(uv__stream_fd(stream), &msg, 0);
810 while (n == -1 && errno == EINTR);
811 } else {
812 do
813 n = uv__writev(uv__stream_fd(stream), iov, iovcnt);
814 while (n == -1 && errno == EINTR);
815 }
816
817 if (n >= 0)
818 return n;
819
820 if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOBUFS)
821 return UV_EAGAIN;
822
823 #ifdef __APPLE__
824 /* macOS versions 10.10 and 10.15 - and presumbaly 10.11 to 10.14, too -
825 * have a bug where a race condition causes the kernel to return EPROTOTYPE
826 * because the socket isn't fully constructed. It's probably the result of
827 * the peer closing the connection and that is why libuv translates it to
828 * ECONNRESET. Previously, libuv retried until the EPROTOTYPE error went
829 * away but some VPN software causes the same behavior except the error is
830 * permanent, not transient, turning the retry mechanism into an infinite
831 * loop. See https://github.com/libuv/libuv/pull/482.
832 */
833 if (errno == EPROTOTYPE)
834 return UV_ECONNRESET;
835 #endif /* __APPLE__ */
836
837 return UV__ERR(errno);
838 }
839
840 static void uv__write(uv_stream_t* stream) {
841 struct uv__queue* q;
842 uv_write_t* req;
843 ssize_t n;
844 int count;
845
846 assert(uv__stream_fd(stream) >= 0);
847
848 /* Prevent loop starvation when the consumer of this stream read as fast as
849 * (or faster than) we can write it. This `count` mechanism does not need to
850 * change even if we switch to edge-triggered I/O.
851 */
852 count = 32;
853
854 for (;;) {
855 if (uv__queue_empty(&stream->write_queue))
856 return;
857
858 q = uv__queue_head(&stream->write_queue);
859 req = uv__queue_data(q, uv_write_t, queue);
860 assert(req->handle == stream);
861
862 n = uv__try_write(stream,
863 &(req->bufs[req->write_index]),
864 req->nbufs - req->write_index,
865 req->send_handle);
866
867 /* Ensure the handle isn't sent again in case this is a partial write. */
868 if (n >= 0) {
869 req->send_handle = NULL;
870 if (uv__write_req_update(stream, req, n)) {
871 uv__write_req_finish(req);
872 if (count-- > 0)
873 continue; /* Start trying to write the next request. */
874
875 return;
876 }
877 } else if (n != UV_EAGAIN)
878 goto error;
879
880 /* If this is a blocking stream, try again. */
881 if (stream->flags & UV_HANDLE_BLOCKING_WRITES)
882 continue;
883
884 /* We're not done. */
885 uv__io_start(stream->loop, &stream->io_watcher, POLLOUT);
886
887 /* Notify select() thread about state change */
888 uv__stream_osx_interrupt_select(stream);
889
890 return;
891 }
892
893 error:
894 req->error = n;
895 uv__write_req_finish(req);
896 uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
897 uv__stream_osx_interrupt_select(stream);
898 }
899
900
901 static void uv__write_callbacks(uv_stream_t* stream) {
902 uv_write_t* req;
903 struct uv__queue* q;
904 struct uv__queue pq;
905
906 if (uv__queue_empty(&stream->write_completed_queue))
907 return;
908
909 uv__queue_move(&stream->write_completed_queue, &pq);
910
911 while (!uv__queue_empty(&pq)) {
912 /* Pop a req off write_completed_queue. */
913 q = uv__queue_head(&pq);
914 req = uv__queue_data(q, uv_write_t, queue);
915 uv__queue_remove(q);
916 uv__req_unregister(stream->loop);
917
918 if (req->bufs != NULL) {
919 stream->write_queue_size -= uv__write_req_size(req);
920 if (req->bufs != req->bufsml)
921 uv__free(req->bufs);
922 req->bufs = NULL;
923 }
924
925 /* NOTE: call callback AFTER freeing the request data. */
926 if (req->cb)
927 req->cb(req, req->error);
928 }
929 }
930
931
932 static void uv__stream_eof(uv_stream_t* stream, const uv_buf_t* buf) {
933 stream->flags |= UV_HANDLE_READ_EOF;
934 stream->flags &= ~UV_HANDLE_READING;
935 uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
936 uv__handle_stop(stream);
937 uv__stream_osx_interrupt_select(stream);
938 stream->read_cb(stream, UV_EOF, buf);
939 }
940
941
942 static int uv__stream_queue_fd(uv_stream_t* stream, int fd) {
943 uv__stream_queued_fds_t* queued_fds;
944 unsigned int queue_size;
945
946 queued_fds = stream->queued_fds;
947 if (queued_fds == NULL) {
948 queue_size = 8;
949 queued_fds = uv__malloc((queue_size - 1) * sizeof(*queued_fds->fds) +
950 sizeof(*queued_fds));
951 if (queued_fds == NULL)
952 return UV_ENOMEM;
953 queued_fds->size = queue_size;
954 queued_fds->offset = 0;
955 stream->queued_fds = queued_fds;
956
957 /* Grow */
958 } else if (queued_fds->size == queued_fds->offset) {
959 queue_size = queued_fds->size + 8;
960 queued_fds = uv__realloc(queued_fds,
961 (queue_size - 1) * sizeof(*queued_fds->fds) +
962 sizeof(*queued_fds));
963
964 /*
965 * Allocation failure, report back.
966 * NOTE: if it is fatal - sockets will be closed in uv__stream_close
967 */
968 if (queued_fds == NULL)
969 return UV_ENOMEM;
970 queued_fds->size = queue_size;
971 stream->queued_fds = queued_fds;
972 }
973
974 /* Put fd in a queue */
975 queued_fds->fds[queued_fds->offset++] = fd;
976
977 return 0;
978 }
979
980
981 static int uv__stream_recv_cmsg(uv_stream_t* stream, struct msghdr* msg) {
982 struct cmsghdr* cmsg;
983 char* p;
984 char* pe;
985 int fd;
986 int err;
987 size_t count;
988
989 err = 0;
990 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
991 if (cmsg->cmsg_type != SCM_RIGHTS) {
992 fprintf(stderr, "ignoring non-SCM_RIGHTS ancillary data: %d\n",
993 cmsg->cmsg_type);
994 continue;
995 }
996
997 assert(cmsg->cmsg_len >= CMSG_LEN(0));
998 count = cmsg->cmsg_len - CMSG_LEN(0);
999 assert(count % sizeof(fd) == 0);
1000 count /= sizeof(fd);
1001
1002 p = (void*) CMSG_DATA(cmsg);
1003 pe = p + count * sizeof(fd);
1004
1005 while (p < pe) {
1006 memcpy(&fd, p, sizeof(fd));
1007 p += sizeof(fd);
1008
1009 if (err == 0) {
1010 if (stream->accepted_fd == -1)
1011 stream->accepted_fd = fd;
1012 else
1013 err = uv__stream_queue_fd(stream, fd);
1014 }
1015
1016 if (err != 0)
1017 uv__close(fd);
1018 }
1019 }
1020
1021 return err;
1022 }
1023
1024
1025 static void uv__read(uv_stream_t* stream) {
1026 uv_buf_t buf;
1027 ssize_t nread;
1028 struct msghdr msg;
1029 union uv__cmsg cmsg;
1030 int count;
1031 int err;
1032 int is_ipc;
1033
1034 stream->flags &= ~UV_HANDLE_READ_PARTIAL;
1035
1036 /* Prevent loop starvation when the data comes in as fast as (or faster than)
1037 * we can read it. XXX Need to rearm fd if we switch to edge-triggered I/O.
1038 */
1039 count = 32;
1040
1041 is_ipc = stream->type == UV_NAMED_PIPE && ((uv_pipe_t*) stream)->ipc;
1042
1043 /* XXX: Maybe instead of having UV_HANDLE_READING we just test if
1044 * tcp->read_cb is NULL or not?
1045 */
1046 while (stream->read_cb
1047 && (stream->flags & UV_HANDLE_READING)
1048 && (count-- > 0)) {
1049 assert(stream->alloc_cb != NULL);
1050
1051 buf = uv_buf_init(NULL, 0);
1052 stream->alloc_cb((uv_handle_t*)stream, 64 * 1024, &buf);
1053 if (buf.base == NULL || buf.len == 0) {
1054 /* User indicates it can't or won't handle the read. */
1055 stream->read_cb(stream, UV_ENOBUFS, &buf);
1056 return;
1057 }
1058
1059 assert(buf.base != NULL);
1060 assert(uv__stream_fd(stream) >= 0);
1061
1062 if (!is_ipc) {
1063 do {
1064 nread = read(uv__stream_fd(stream), buf.base, buf.len);
1065 }
1066 while (nread < 0 && errno == EINTR);
1067 } else {
1068 /* ipc uses recvmsg */
1069 msg.msg_flags = 0;
1070 msg.msg_iov = (struct iovec*) &buf;
1071 msg.msg_iovlen = 1;
1072 msg.msg_name = NULL;
1073 msg.msg_namelen = 0;
1074 /* Set up to receive a descriptor even if one isn't in the message */
1075 msg.msg_controllen = sizeof(cmsg);
1076 msg.msg_control = &cmsg.hdr;
1077
1078 do {
1079 nread = uv__recvmsg(uv__stream_fd(stream), &msg, 0);
1080 }
1081 while (nread < 0 && errno == EINTR);
1082 }
1083
1084 if (nread < 0) {
1085 /* Error */
1086 if (errno == EAGAIN || errno == EWOULDBLOCK) {
1087 /* Wait for the next one. */
1088 if (stream->flags & UV_HANDLE_READING) {
1089 uv__io_start(stream->loop, &stream->io_watcher, POLLIN);
1090 uv__stream_osx_interrupt_select(stream);
1091 }
1092 stream->read_cb(stream, 0, &buf);
1093 #if defined(__CYGWIN__) || defined(__MSYS__)
1094 } else if (errno == ECONNRESET && stream->type == UV_NAMED_PIPE) {
1095 uv__stream_eof(stream, &buf);
1096 return;
1097 #endif
1098 } else {
1099 /* Error. User should call uv_close(). */
1100 stream->flags &= ~(UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
1101 stream->read_cb(stream, UV__ERR(errno), &buf);
1102 if (stream->flags & UV_HANDLE_READING) {
1103 stream->flags &= ~UV_HANDLE_READING;
1104 uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
1105 uv__handle_stop(stream);
1106 uv__stream_osx_interrupt_select(stream);
1107 }
1108 }
1109 return;
1110 } else if (nread == 0) {
1111 uv__stream_eof(stream, &buf);
1112 return;
1113 } else {
1114 /* Successful read */
1115 ssize_t buflen = buf.len;
1116
1117 if (is_ipc) {
1118 err = uv__stream_recv_cmsg(stream, &msg);
1119 if (err != 0) {
1120 stream->read_cb(stream, err, &buf);
1121 return;
1122 }
1123 }
1124
1125 #if defined(__MVS__)
1126 if (is_ipc && msg.msg_controllen > 0) {
1127 uv_buf_t blankbuf;
1128 int nread;
1129 struct iovec *old;
1130
1131 blankbuf.base = 0;
1132 blankbuf.len = 0;
1133 old = msg.msg_iov;
1134 msg.msg_iov = (struct iovec*) &blankbuf;
1135 nread = 0;
1136 do {
1137 nread = uv__recvmsg(uv__stream_fd(stream), &msg, 0);
1138 err = uv__stream_recv_cmsg(stream, &msg);
1139 if (err != 0) {
1140 stream->read_cb(stream, err, &buf);
1141 msg.msg_iov = old;
1142 return;
1143 }
1144 } while (nread == 0 && msg.msg_controllen > 0);
1145 msg.msg_iov = old;
1146 }
1147 #endif
1148 stream->read_cb(stream, nread, &buf);
1149
1150 /* Return if we didn't fill the buffer, there is no more data to read. */
1151 if (nread < buflen) {
1152 stream->flags |= UV_HANDLE_READ_PARTIAL;
1153 return;
1154 }
1155 }
1156 }
1157 }
1158
1159
1160 int uv_shutdown(uv_shutdown_t* req, uv_stream_t* stream, uv_shutdown_cb cb) {
1161 assert(stream->type == UV_TCP ||
1162 stream->type == UV_TTY ||
1163 stream->type == UV_NAMED_PIPE);
1164
1165 if (!(stream->flags & UV_HANDLE_WRITABLE) ||
1166 stream->flags & UV_HANDLE_SHUT ||
1167 uv__is_stream_shutting(stream) ||
1168 uv__is_closing(stream)) {
1169 return UV_ENOTCONN;
1170 }
1171
1172 assert(uv__stream_fd(stream) >= 0);
1173
1174 /* Initialize request. The `shutdown(2)` call will always be deferred until
1175 * `uv__drain`, just before the callback is run. */
1176 uv__req_init(stream->loop, req, UV_SHUTDOWN);
1177 req->handle = stream;
1178 req->cb = cb;
1179 stream->shutdown_req = req;
1180 stream->flags &= ~UV_HANDLE_WRITABLE;
1181
1182 if (uv__queue_empty(&stream->write_queue))
1183 uv__io_feed(stream->loop, &stream->io_watcher);
1184
1185 return 0;
1186 }
1187
1188
1189 static void uv__stream_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
1190 uv_stream_t* stream;
1191
1192 stream = container_of(w, uv_stream_t, io_watcher);
1193
1194 assert(stream->type == UV_TCP ||
1195 stream->type == UV_NAMED_PIPE ||
1196 stream->type == UV_TTY);
1197 assert(!(stream->flags & UV_HANDLE_CLOSING));
1198
1199 if (stream->connect_req) {
1200 uv__stream_connect(stream);
1201 return;
1202 }
1203
1204 assert(uv__stream_fd(stream) >= 0);
1205
1206 /* Ignore POLLHUP here. Even if it's set, there may still be data to read. */
1207 if (events & (POLLIN | POLLERR | POLLHUP))
1208 uv__read(stream);
1209
1210 if (uv__stream_fd(stream) == -1)
1211 return; /* read_cb closed stream. */
1212
1213 /* Short-circuit iff POLLHUP is set, the user is still interested in read
1214 * events and uv__read() reported a partial read but not EOF. If the EOF
1215 * flag is set, uv__read() called read_cb with err=UV_EOF and we don't
1216 * have to do anything. If the partial read flag is not set, we can't
1217 * report the EOF yet because there is still data to read.
1218 */
1219 if ((events & POLLHUP) &&
1220 (stream->flags & UV_HANDLE_READING) &&
1221 (stream->flags & UV_HANDLE_READ_PARTIAL) &&
1222 !(stream->flags & UV_HANDLE_READ_EOF)) {
1223 uv_buf_t buf = { NULL, 0 };
1224 uv__stream_eof(stream, &buf);
1225 }
1226
1227 if (uv__stream_fd(stream) == -1)
1228 return; /* read_cb closed stream. */
1229
1230 if (events & (POLLOUT | POLLERR | POLLHUP)) {
1231 uv__write(stream);
1232 uv__write_callbacks(stream);
1233
1234 /* Write queue drained. */
1235 if (uv__queue_empty(&stream->write_queue))
1236 uv__drain(stream);
1237 }
1238 }
1239
1240
1241 /**
1242 * We get called here from directly following a call to connect(2).
1243 * In order to determine if we've errored out or succeeded must call
1244 * getsockopt.
1245 */
1246 static void uv__stream_connect(uv_stream_t* stream) {
1247 int error;
1248 uv_connect_t* req = stream->connect_req;
1249 socklen_t errorsize = sizeof(int);
1250
1251 assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE);
1252 assert(req);
1253
1254 if (stream->delayed_error) {
1255 /* To smooth over the differences between unixes errors that
1256 * were reported synchronously on the first connect can be delayed
1257 * until the next tick--which is now.
1258 */
1259 error = stream->delayed_error;
1260 stream->delayed_error = 0;
1261 } else {
1262 /* Normal situation: we need to get the socket error from the kernel. */
1263 assert(uv__stream_fd(stream) >= 0);
1264 getsockopt(uv__stream_fd(stream),
1265 SOL_SOCKET,
1266 SO_ERROR,
1267 &error,
1268 &errorsize);
1269 error = UV__ERR(error);
1270 }
1271
1272 if (error == UV__ERR(EINPROGRESS))
1273 return;
1274
1275 stream->connect_req = NULL;
1276 uv__req_unregister(stream->loop);
1277
1278 if (error < 0 || uv__queue_empty(&stream->write_queue)) {
1279 uv__io_stop(stream->loop, &stream->io_watcher, POLLOUT);
1280 }
1281
1282 if (req->cb)
1283 req->cb(req, error);
1284
1285 if (uv__stream_fd(stream) == -1)
1286 return;
1287
1288 if (error < 0) {
1289 uv__stream_flush_write_queue(stream, UV_ECANCELED);
1290 uv__write_callbacks(stream);
1291 }
1292 }
1293
1294
1295 static int uv__check_before_write(uv_stream_t* stream,
1296 unsigned int nbufs,
1297 uv_stream_t* send_handle) {
1298 assert(nbufs > 0);
1299 assert((stream->type == UV_TCP ||
1300 stream->type == UV_NAMED_PIPE ||
1301 stream->type == UV_TTY) &&
1302 "uv_write (unix) does not yet support other types of streams");
1303
1304 if (uv__stream_fd(stream) < 0)
1305 return UV_EBADF;
1306
1307 if (!(stream->flags & UV_HANDLE_WRITABLE))
1308 return UV_EPIPE;
1309
1310 if (send_handle != NULL) {
1311 if (stream->type != UV_NAMED_PIPE || !((uv_pipe_t*)stream)->ipc)
1312 return UV_EINVAL;
1313
1314 /* XXX We abuse uv_write2() to send over UDP handles to child processes.
1315 * Don't call uv__stream_fd() on those handles, it's a macro that on OS X
1316 * evaluates to a function that operates on a uv_stream_t with a couple of
1317 * OS X specific fields. On other Unices it does (handle)->io_watcher.fd,
1318 * which works but only by accident.
1319 */
1320 if (uv__handle_fd((uv_handle_t*) send_handle) < 0)
1321 return UV_EBADF;
1322
1323 #if defined(__CYGWIN__) || defined(__MSYS__)
1324 /* Cygwin recvmsg always sets msg_controllen to zero, so we cannot send it.
1325 See https://github.com/mirror/newlib-cygwin/blob/86fc4bf0/winsup/cygwin/fhandler_socket.cc#L1736-L1743 */
1326 return UV_ENOSYS;
1327 #endif
1328 }
1329
1330 return 0;
1331 }
1332
1333 int uv_write2(uv_write_t* req,
1334 uv_stream_t* stream,
1335 const uv_buf_t bufs[],
1336 unsigned int nbufs,
1337 uv_stream_t* send_handle,
1338 uv_write_cb cb) {
1339 int empty_queue;
1340 int err;
1341
1342 err = uv__check_before_write(stream, nbufs, send_handle);
1343 if (err < 0)
1344 return err;
1345
1346 /* It's legal for write_queue_size > 0 even when the write_queue is empty;
1347 * it means there are error-state requests in the write_completed_queue that
1348 * will touch up write_queue_size later, see also uv__write_req_finish().
1349 * We could check that write_queue is empty instead but that implies making
1350 * a write() syscall when we know that the handle is in error mode.
1351 */
1352 empty_queue = (stream->write_queue_size == 0);
1353
1354 /* Initialize the req */
1355 uv__req_init(stream->loop, req, UV_WRITE);
1356 req->cb = cb;
1357 req->handle = stream;
1358 req->error = 0;
1359 req->send_handle = send_handle;
1360 uv__queue_init(&req->queue);
1361
1362 req->bufs = req->bufsml;
1363 if (nbufs > ARRAY_SIZE(req->bufsml))
1364 req->bufs = uv__malloc(nbufs * sizeof(bufs[0]));
1365
1366 if (req->bufs == NULL)
1367 return UV_ENOMEM;
1368
1369 memcpy(req->bufs, bufs, nbufs * sizeof(bufs[0]));
1370 req->nbufs = nbufs;
1371 req->write_index = 0;
1372 stream->write_queue_size += uv__count_bufs(bufs, nbufs);
1373
1374 /* Append the request to write_queue. */
1375 uv__queue_insert_tail(&stream->write_queue, &req->queue);
1376
1377 /* If the queue was empty when this function began, we should attempt to
1378 * do the write immediately. Otherwise start the write_watcher and wait
1379 * for the fd to become writable.
1380 */
1381 if (stream->connect_req) {
1382 /* Still connecting, do nothing. */
1383 }
1384 else if (empty_queue) {
1385 uv__write(stream);
1386 }
1387 else {
1388 /*
1389 * blocking streams should never have anything in the queue.
1390 * if this assert fires then somehow the blocking stream isn't being
1391 * sufficiently flushed in uv__write.
1392 */
1393 assert(!(stream->flags & UV_HANDLE_BLOCKING_WRITES));
1394 uv__io_start(stream->loop, &stream->io_watcher, POLLOUT);
1395 uv__stream_osx_interrupt_select(stream);
1396 }
1397
1398 return 0;
1399 }
1400
1401
1402 /* The buffers to be written must remain valid until the callback is called.
1403 * This is not required for the uv_buf_t array.
1404 */
1405 int uv_write(uv_write_t* req,
1406 uv_stream_t* handle,
1407 const uv_buf_t bufs[],
1408 unsigned int nbufs,
1409 uv_write_cb cb) {
1410 return uv_write2(req, handle, bufs, nbufs, NULL, cb);
1411 }
1412
1413
1414 int uv_try_write(uv_stream_t* stream,
1415 const uv_buf_t bufs[],
1416 unsigned int nbufs) {
1417 return uv_try_write2(stream, bufs, nbufs, NULL);
1418 }
1419
1420
1421 int uv_try_write2(uv_stream_t* stream,
1422 const uv_buf_t bufs[],
1423 unsigned int nbufs,
1424 uv_stream_t* send_handle) {
1425 int err;
1426
1427 /* Connecting or already writing some data */
1428 if (stream->connect_req != NULL || stream->write_queue_size != 0)
1429 return UV_EAGAIN;
1430
1431 err = uv__check_before_write(stream, nbufs, NULL);
1432 if (err < 0)
1433 return err;
1434
1435 return uv__try_write(stream, bufs, nbufs, send_handle);
1436 }
1437
1438
1439 int uv__read_start(uv_stream_t* stream,
1440 uv_alloc_cb alloc_cb,
1441 uv_read_cb read_cb) {
1442 assert(stream->type == UV_TCP || stream->type == UV_NAMED_PIPE ||
1443 stream->type == UV_TTY);
1444
1445 /* The UV_HANDLE_READING flag is irrelevant of the state of the stream - it
1446 * just expresses the desired state of the user. */
1447 stream->flags |= UV_HANDLE_READING;
1448 stream->flags &= ~UV_HANDLE_READ_EOF;
1449
1450 /* TODO: try to do the read inline? */
1451 assert(uv__stream_fd(stream) >= 0);
1452 assert(alloc_cb);
1453
1454 stream->read_cb = read_cb;
1455 stream->alloc_cb = alloc_cb;
1456
1457 uv__io_start(stream->loop, &stream->io_watcher, POLLIN);
1458 uv__handle_start(stream);
1459 uv__stream_osx_interrupt_select(stream);
1460
1461 return 0;
1462 }
1463
1464
1465 int uv_read_stop(uv_stream_t* stream) {
1466 if (!(stream->flags & UV_HANDLE_READING))
1467 return 0;
1468
1469 stream->flags &= ~UV_HANDLE_READING;
1470 uv__io_stop(stream->loop, &stream->io_watcher, POLLIN);
1471 uv__handle_stop(stream);
1472 uv__stream_osx_interrupt_select(stream);
1473
1474 stream->read_cb = NULL;
1475 stream->alloc_cb = NULL;
1476 return 0;
1477 }
1478
1479
1480 int uv_is_readable(const uv_stream_t* stream) {
1481 return !!(stream->flags & UV_HANDLE_READABLE);
1482 }
1483
1484
1485 int uv_is_writable(const uv_stream_t* stream) {
1486 return !!(stream->flags & UV_HANDLE_WRITABLE);
1487 }
1488
1489
1490 #if defined(__APPLE__)
1491 int uv___stream_fd(const uv_stream_t* handle) {
1492 const uv__stream_select_t* s;
1493
1494 assert(handle->type == UV_TCP ||
1495 handle->type == UV_TTY ||
1496 handle->type == UV_NAMED_PIPE);
1497
1498 s = handle->select;
1499 if (s != NULL)
1500 return s->fd;
1501
1502 return handle->io_watcher.fd;
1503 }
1504 #endif /* defined(__APPLE__) */
1505
1506
1507 void uv__stream_close(uv_stream_t* handle) {
1508 unsigned int i;
1509 uv__stream_queued_fds_t* queued_fds;
1510
1511 #if defined(__APPLE__)
1512 /* Terminate select loop first */
1513 if (handle->select != NULL) {
1514 uv__stream_select_t* s;
1515
1516 s = handle->select;
1517
1518 uv_sem_post(&s->close_sem);
1519 uv_sem_post(&s->async_sem);
1520 uv__stream_osx_interrupt_select(handle);
1521 uv_thread_join(&s->thread);
1522 uv_sem_destroy(&s->close_sem);
1523 uv_sem_destroy(&s->async_sem);
1524 uv__close(s->fake_fd);
1525 uv__close(s->int_fd);
1526 uv_close((uv_handle_t*) &s->async, uv__stream_osx_cb_close);
1527
1528 handle->select = NULL;
1529 }
1530 #endif /* defined(__APPLE__) */
1531
1532 uv__io_close(handle->loop, &handle->io_watcher);
1533 uv_read_stop(handle);
1534 uv__handle_stop(handle);
1535 handle->flags &= ~(UV_HANDLE_READABLE | UV_HANDLE_WRITABLE);
1536
1537 if (handle->io_watcher.fd != -1) {
1538 /* Don't close stdio file descriptors. Nothing good comes from it. */
1539 if (handle->io_watcher.fd > STDERR_FILENO)
1540 uv__close(handle->io_watcher.fd);
1541 handle->io_watcher.fd = -1;
1542 }
1543
1544 if (handle->accepted_fd != -1) {
1545 uv__close(handle->accepted_fd);
1546 handle->accepted_fd = -1;
1547 }
1548
1549 /* Close all queued fds */
1550 if (handle->queued_fds != NULL) {
1551 queued_fds = handle->queued_fds;
1552 for (i = 0; i < queued_fds->offset; i++)
1553 uv__close(queued_fds->fds[i]);
1554 uv__free(handle->queued_fds);
1555 handle->queued_fds = NULL;
1556 }
1557
1558 assert(!uv__io_active(&handle->io_watcher, POLLIN | POLLOUT));
1559 }
1560
1561
1562 int uv_stream_set_blocking(uv_stream_t* handle, int blocking) {
1563 /* Don't need to check the file descriptor, uv__nonblock()
1564 * will fail with EBADF if it's not valid.
1565 */
1566 return uv__nonblock(uv__stream_fd(handle), !blocking);
1567 }