File: core.c

package info (click to toggle)
nodejs 0.10.29~dfsg-2
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 32,760 kB
  • ctags: 58,506
  • sloc: cpp: 330,356; ansic: 47,440; python: 12,756; sh: 1,365; makefile: 665; lisp: 222; ruby: 76; xml: 16; awk: 10
file content (732 lines) | stat: -rw-r--r-- 15,874 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "uv.h"
#include "internal.h"

#include <stddef.h> /* NULL */
#include <stdio.h> /* printf */
#include <stdlib.h>
#include <string.h> /* strerror */
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <limits.h> /* INT_MAX, PATH_MAX */
#include <sys/uio.h> /* writev */

#ifdef __linux__
# include <sys/ioctl.h>
#endif

#ifdef __sun
# include <sys/types.h>
# include <sys/wait.h>
#endif

#ifdef __APPLE__
# include <mach-o/dyld.h> /* _NSGetExecutablePath */
# include <sys/filio.h>
# include <sys/ioctl.h>
#endif

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
# include <sys/sysctl.h>
# include <sys/filio.h>
# include <sys/ioctl.h>
# include <sys/wait.h>
#endif

static void uv__run_pending(uv_loop_t* loop);

static uv_loop_t default_loop_struct;
static uv_loop_t* default_loop_ptr;

/* Verify that uv_buf_t is ABI-compatible with struct iovec. */
STATIC_ASSERT(sizeof(uv_buf_t) == sizeof(struct iovec));
STATIC_ASSERT(sizeof(&((uv_buf_t*) 0)->base) ==
              sizeof(((struct iovec*) 0)->iov_base));
STATIC_ASSERT(sizeof(&((uv_buf_t*) 0)->len) ==
              sizeof(((struct iovec*) 0)->iov_len));
STATIC_ASSERT(offsetof(uv_buf_t, base) == offsetof(struct iovec, iov_base));
STATIC_ASSERT(offsetof(uv_buf_t, len) == offsetof(struct iovec, iov_len));


uint64_t uv_hrtime(void) {
  return uv__hrtime();
}


void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
  assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));

  handle->flags |= UV_CLOSING;
  handle->close_cb = close_cb;

  switch (handle->type) {
  case UV_NAMED_PIPE:
    uv__pipe_close((uv_pipe_t*)handle);
    break;

  case UV_TTY:
    uv__stream_close((uv_stream_t*)handle);
    break;

  case UV_TCP:
    uv__tcp_close((uv_tcp_t*)handle);
    break;

  case UV_UDP:
    uv__udp_close((uv_udp_t*)handle);
    break;

  case UV_PREPARE:
    uv__prepare_close((uv_prepare_t*)handle);
    break;

  case UV_CHECK:
    uv__check_close((uv_check_t*)handle);
    break;

  case UV_IDLE:
    uv__idle_close((uv_idle_t*)handle);
    break;

  case UV_ASYNC:
    uv__async_close((uv_async_t*)handle);
    break;

  case UV_TIMER:
    uv__timer_close((uv_timer_t*)handle);
    break;

  case UV_PROCESS:
    uv__process_close((uv_process_t*)handle);
    break;

  case UV_FS_EVENT:
    uv__fs_event_close((uv_fs_event_t*)handle);
    break;

  case UV_POLL:
    uv__poll_close((uv_poll_t*)handle);
    break;

  case UV_FS_POLL:
    uv__fs_poll_close((uv_fs_poll_t*)handle);
    break;

  case UV_SIGNAL:
    uv__signal_close((uv_signal_t*) handle);
    /* Signal handles may not be closed immediately. The signal code will */
    /* itself close uv__make_close_pending whenever appropriate. */
    return;

  default:
    assert(0);
  }

  uv__make_close_pending(handle);
}


void uv__make_close_pending(uv_handle_t* handle) {
  assert(handle->flags & UV_CLOSING);
  assert(!(handle->flags & UV_CLOSED));
  handle->next_closing = handle->loop->closing_handles;
  handle->loop->closing_handles = handle;
}


static void uv__finish_close(uv_handle_t* handle) {
  /* Note: while the handle is in the UV_CLOSING state now, it's still possible
   * for it to be active in the sense that uv__is_active() returns true.
   * A good example is when the user calls uv_shutdown(), immediately followed
   * by uv_close(). The handle is considered active at this point because the
   * completion of the shutdown req is still pending.
   */
  assert(handle->flags & UV_CLOSING);
  assert(!(handle->flags & UV_CLOSED));
  handle->flags |= UV_CLOSED;

  switch (handle->type) {
    case UV_PREPARE:
    case UV_CHECK:
    case UV_IDLE:
    case UV_ASYNC:
    case UV_TIMER:
    case UV_PROCESS:
    case UV_FS_EVENT:
    case UV_FS_POLL:
    case UV_POLL:
    case UV_SIGNAL:
      break;

    case UV_NAMED_PIPE:
    case UV_TCP:
    case UV_TTY:
      uv__stream_destroy((uv_stream_t*)handle);
      break;

    case UV_UDP:
      uv__udp_finish_close((uv_udp_t*)handle);
      break;

    default:
      assert(0);
      break;
  }

  uv__handle_unref(handle);
  ngx_queue_remove(&handle->handle_queue);

  if (handle->close_cb) {
    handle->close_cb(handle);
  }
}


static void uv__run_closing_handles(uv_loop_t* loop) {
  uv_handle_t* p;
  uv_handle_t* q;

  p = loop->closing_handles;
  loop->closing_handles = NULL;

  while (p) {
    q = p->next_closing;
    uv__finish_close(p);
    p = q;
  }
}


int uv_is_closing(const uv_handle_t* handle) {
  return uv__is_closing(handle);
}


uv_loop_t* uv_default_loop(void) {
  if (default_loop_ptr)
    return default_loop_ptr;

  if (uv__loop_init(&default_loop_struct, /* default_loop? */ 1))
    return NULL;

  return (default_loop_ptr = &default_loop_struct);
}


uv_loop_t* uv_loop_new(void) {
  uv_loop_t* loop;

  if ((loop = malloc(sizeof(*loop))) == NULL)
    return NULL;

  if (uv__loop_init(loop, /* default_loop? */ 0)) {
    free(loop);
    return NULL;
  }

  return loop;
}


void uv_loop_delete(uv_loop_t* loop) {
  uv__loop_delete(loop);
#ifndef NDEBUG
  memset(loop, -1, sizeof *loop);
#endif
  if (loop == default_loop_ptr)
    default_loop_ptr = NULL;
  else
    free(loop);
}


int uv_backend_fd(const uv_loop_t* loop) {
  return loop->backend_fd;
}


int uv_backend_timeout(const uv_loop_t* loop) {
  if (loop->stop_flag != 0)
    return 0;

  if (!uv__has_active_handles(loop) && !uv__has_active_reqs(loop))
    return 0;

  if (!ngx_queue_empty(&loop->idle_handles))
    return 0;

  if (loop->closing_handles)
    return 0;

  return uv__next_timeout(loop);
}


static int uv__loop_alive(uv_loop_t* loop) {
  return uv__has_active_handles(loop) ||
         uv__has_active_reqs(loop) ||
         loop->closing_handles != NULL;
}


int uv_run(uv_loop_t* loop, uv_run_mode mode) {
  int timeout;
  int r;

  r = uv__loop_alive(loop);
  while (r != 0 && loop->stop_flag == 0) {
    UV_TICK_START(loop, mode);

    uv__update_time(loop);
    uv__run_timers(loop);
    uv__run_idle(loop);
    uv__run_prepare(loop);
    uv__run_pending(loop);

    timeout = 0;
    if ((mode & UV_RUN_NOWAIT) == 0)
      timeout = uv_backend_timeout(loop);

    uv__io_poll(loop, timeout);
    uv__run_check(loop);
    uv__run_closing_handles(loop);
    r = uv__loop_alive(loop);

    UV_TICK_STOP(loop, mode);

    if (mode & (UV_RUN_ONCE | UV_RUN_NOWAIT))
      break;
  }

  /* The if statement lets gcc compile it to a conditional store. Avoids
   * dirtying a cache line.
   */
  if (loop->stop_flag != 0)
    loop->stop_flag = 0;

  return r;
}


void uv_update_time(uv_loop_t* loop) {
  uv__update_time(loop);
}


int uv_is_active(const uv_handle_t* handle) {
  return uv__is_active(handle);
}


/* Open a socket in non-blocking close-on-exec mode, atomically if possible. */
int uv__socket(int domain, int type, int protocol) {
  int sockfd;

#if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC)
  sockfd = socket(domain, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);

  if (sockfd != -1)
    goto out;

  if (errno != EINVAL)
    goto out;
#endif

  sockfd = socket(domain, type, protocol);

  if (sockfd == -1)
    goto out;

  if (uv__nonblock(sockfd, 1) || uv__cloexec(sockfd, 1)) {
    close(sockfd);
    sockfd = -1;
  }

#if defined(SO_NOSIGPIPE)
  {
    int on = 1;
    setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, &on, sizeof(on));
  }
#endif

out:
  return sockfd;
}


int uv__accept(int sockfd) {
  int peerfd;

  assert(sockfd >= 0);

  while (1) {
#if defined(__linux__)
    static int no_accept4;

    if (no_accept4)
      goto skip;

    peerfd = uv__accept4(sockfd,
                         NULL,
                         NULL,
                         UV__SOCK_NONBLOCK|UV__SOCK_CLOEXEC);

    if (peerfd != -1)
      break;

    if (errno == EINTR)
      continue;

    if (errno != ENOSYS)
      break;

    no_accept4 = 1;
skip:
#endif

    peerfd = accept(sockfd, NULL, NULL);

    if (peerfd == -1) {
      if (errno == EINTR)
        continue;
      else
        break;
    }

    if (uv__cloexec(peerfd, 1) || uv__nonblock(peerfd, 1)) {
      close(peerfd);
      peerfd = -1;
    }

    break;
  }

  return peerfd;
}


#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)

int uv__nonblock(int fd, int set) {
  int r;

  do
    r = ioctl(fd, FIONBIO, &set);
  while (r == -1 && errno == EINTR);

  return r;
}


int uv__cloexec(int fd, int set) {
  int r;

  do
    r = ioctl(fd, set ? FIOCLEX : FIONCLEX);
  while (r == -1 && errno == EINTR);

  return r;
}

#else /* !(defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)) */

int uv__nonblock(int fd, int set) {
  int flags;
  int r;

  do
    r = fcntl(fd, F_GETFL);
  while (r == -1 && errno == EINTR);

  if (r == -1)
    return -1;

  /* Bail out now if already set/clear. */
  if (!!(r & O_NONBLOCK) == !!set)
    return 0;

  if (set)
    flags = r | O_NONBLOCK;
  else
    flags = r & ~O_NONBLOCK;

  do
    r = fcntl(fd, F_SETFL, flags);
  while (r == -1 && errno == EINTR);

  return r;
}


int uv__cloexec(int fd, int set) {
  int flags;
  int r;

  do
    r = fcntl(fd, F_GETFD);
  while (r == -1 && errno == EINTR);

  if (r == -1)
    return -1;

  /* Bail out now if already set/clear. */
  if (!!(r & FD_CLOEXEC) == !!set)
    return 0;

  if (set)
    flags = r | FD_CLOEXEC;
  else
    flags = r & ~FD_CLOEXEC;

  do
    r = fcntl(fd, F_SETFD, flags);
  while (r == -1 && errno == EINTR);

  return r;
}

#endif /* defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) */


/* This function is not execve-safe, there is a race window
 * between the call to dup() and fcntl(FD_CLOEXEC).
 */
int uv__dup(int fd) {
  fd = dup(fd);

  if (fd == -1)
    return -1;

  if (uv__cloexec(fd, 1)) {
    SAVE_ERRNO(close(fd));
    return -1;
  }

  return fd;
}


uv_err_t uv_cwd(char* buffer, size_t size) {
  if (!buffer || !size) {
    return uv__new_artificial_error(UV_EINVAL);
  }

  if (getcwd(buffer, size)) {
    return uv_ok_;
  } else {
    return uv__new_sys_error(errno);
  }
}


uv_err_t uv_chdir(const char* dir) {
  if (chdir(dir) == 0) {
    return uv_ok_;
  } else {
    return uv__new_sys_error(errno);
  }
}


void uv_disable_stdio_inheritance(void) {
  int fd;

  /* Set the CLOEXEC flag on all open descriptors. Unconditionally try the
   * first 16 file descriptors. After that, bail out after the first error.
   */
  for (fd = 0; ; fd++)
    if (uv__cloexec(fd, 1) && fd > 15)
      break;
}


static void uv__run_pending(uv_loop_t* loop) {
  ngx_queue_t* q;
  uv__io_t* w;

  while (!ngx_queue_empty(&loop->pending_queue)) {
    q = ngx_queue_head(&loop->pending_queue);
    ngx_queue_remove(q);
    ngx_queue_init(q);

    w = ngx_queue_data(q, uv__io_t, pending_queue);
    w->cb(loop, w, UV__POLLOUT);
  }
}


static unsigned int next_power_of_two(unsigned int val) {
  val -= 1;
  val |= val >> 1;
  val |= val >> 2;
  val |= val >> 4;
  val |= val >> 8;
  val |= val >> 16;
  val += 1;
  return val;
}

static void maybe_resize(uv_loop_t* loop, unsigned int len) {
  uv__io_t** watchers;
  void* fake_watcher_list;
  void* fake_watcher_count;
  unsigned int nwatchers;
  unsigned int i;

  if (len <= loop->nwatchers)
    return;

  /* Preserve fake watcher list and count at the end of the watchers */
  if (loop->watchers != NULL) {
    fake_watcher_list = loop->watchers[loop->nwatchers];
    fake_watcher_count = loop->watchers[loop->nwatchers + 1];
  } else {
    fake_watcher_list = NULL;
    fake_watcher_count = NULL;
  }

  nwatchers = next_power_of_two(len + 2) - 2;
  watchers = realloc(loop->watchers,
                     (nwatchers + 2) * sizeof(loop->watchers[0]));

  if (watchers == NULL)
    abort();
  for (i = loop->nwatchers; i < nwatchers; i++)
    watchers[i] = NULL;
  watchers[nwatchers] = fake_watcher_list;
  watchers[nwatchers + 1] = fake_watcher_count;

  loop->watchers = watchers;
  loop->nwatchers = nwatchers;
}


void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd) {
  assert(cb != NULL);
  assert(fd >= -1);
  ngx_queue_init(&w->pending_queue);
  ngx_queue_init(&w->watcher_queue);
  w->cb = cb;
  w->fd = fd;
  w->events = 0;
  w->pevents = 0;

#if defined(UV_HAVE_KQUEUE)
  w->rcount = 0;
  w->wcount = 0;
#endif /* defined(UV_HAVE_KQUEUE) */
}


void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
  assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
  assert(0 != events);
  assert(w->fd >= 0);
  assert(w->fd < INT_MAX);

  w->pevents |= events;
  maybe_resize(loop, w->fd + 1);

#if !defined(__sun)
  /* The event ports backend needs to rearm all file descriptors on each and
   * every tick of the event loop but the other backends allow us to
   * short-circuit here if the event mask is unchanged.
   */
  if (w->events == w->pevents) {
    if (w->events == 0 && !ngx_queue_empty(&w->watcher_queue)) {
      ngx_queue_remove(&w->watcher_queue);
      ngx_queue_init(&w->watcher_queue);
    }
    return;
  }
#endif

  if (ngx_queue_empty(&w->watcher_queue))
    ngx_queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);

  if (loop->watchers[w->fd] == NULL) {
    loop->watchers[w->fd] = w;
    loop->nfds++;
  }
}


void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
  assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
  assert(0 != events);

  if (w->fd == -1)
    return;

  assert(w->fd >= 0);

  /* Happens when uv__io_stop() is called on a handle that was never started. */
  if ((unsigned) w->fd >= loop->nwatchers)
    return;

  w->pevents &= ~events;

  if (w->pevents == 0) {
    ngx_queue_remove(&w->watcher_queue);
    ngx_queue_init(&w->watcher_queue);

    if (loop->watchers[w->fd] != NULL) {
      assert(loop->watchers[w->fd] == w);
      assert(loop->nfds > 0);
      loop->watchers[w->fd] = NULL;
      loop->nfds--;
      w->events = 0;
    }
  }
  else if (ngx_queue_empty(&w->watcher_queue))
    ngx_queue_insert_tail(&loop->watcher_queue, &w->watcher_queue);
}


void uv__io_close(uv_loop_t* loop, uv__io_t* w) {
  uv__io_stop(loop, w, UV__POLLIN | UV__POLLOUT);
  ngx_queue_remove(&w->pending_queue);

  /* Remove stale events for this file descriptor */
  uv__platform_invalidate_fd(loop, w->fd);
}


void uv__io_feed(uv_loop_t* loop, uv__io_t* w) {
  if (ngx_queue_empty(&w->pending_queue))
    ngx_queue_insert_tail(&loop->pending_queue, &w->pending_queue);
}


int uv__io_active(const uv__io_t* w, unsigned int events) {
  assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
  assert(0 != events);
  return 0 != (w->pevents & events);
}