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Revision: 1.183
Committed: Wed Dec 12 05:11:56 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.182: +13 -11 lines
Log Message:
remember wether the fd was new or not

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifdef __cplusplus
33 extern "C" {
34 #endif
35
36 #ifndef EV_STANDALONE
37 # ifdef EV_CONFIG_H
38 # include EV_CONFIG_H
39 # else
40 # include "config.h"
41 # endif
42
43 # if HAVE_CLOCK_GETTIME
44 # ifndef EV_USE_MONOTONIC
45 # define EV_USE_MONOTONIC 1
46 # endif
47 # ifndef EV_USE_REALTIME
48 # define EV_USE_REALTIME 1
49 # endif
50 # else
51 # ifndef EV_USE_MONOTONIC
52 # define EV_USE_MONOTONIC 0
53 # endif
54 # ifndef EV_USE_REALTIME
55 # define EV_USE_REALTIME 0
56 # endif
57 # endif
58
59 # ifndef EV_USE_SELECT
60 # if HAVE_SELECT && HAVE_SYS_SELECT_H
61 # define EV_USE_SELECT 1
62 # else
63 # define EV_USE_SELECT 0
64 # endif
65 # endif
66
67 # ifndef EV_USE_POLL
68 # if HAVE_POLL && HAVE_POLL_H
69 # define EV_USE_POLL 1
70 # else
71 # define EV_USE_POLL 0
72 # endif
73 # endif
74
75 # ifndef EV_USE_EPOLL
76 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
77 # define EV_USE_EPOLL 1
78 # else
79 # define EV_USE_EPOLL 0
80 # endif
81 # endif
82
83 # ifndef EV_USE_KQUEUE
84 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
85 # define EV_USE_KQUEUE 1
86 # else
87 # define EV_USE_KQUEUE 0
88 # endif
89 # endif
90
91 # ifndef EV_USE_PORT
92 # if HAVE_PORT_H && HAVE_PORT_CREATE
93 # define EV_USE_PORT 1
94 # else
95 # define EV_USE_PORT 0
96 # endif
97 # endif
98
99 # ifndef EV_USE_INOTIFY
100 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
101 # define EV_USE_INOTIFY 1
102 # else
103 # define EV_USE_INOTIFY 0
104 # endif
105 # endif
106
107 #endif
108
109 #include <math.h>
110 #include <stdlib.h>
111 #include <fcntl.h>
112 #include <stddef.h>
113
114 #include <stdio.h>
115
116 #include <assert.h>
117 #include <errno.h>
118 #include <sys/types.h>
119 #include <time.h>
120
121 #include <signal.h>
122
123 #ifdef EV_H
124 # include EV_H
125 #else
126 # include "ev.h"
127 #endif
128
129 #ifndef _WIN32
130 # include <sys/time.h>
131 # include <sys/wait.h>
132 # include <unistd.h>
133 #else
134 # define WIN32_LEAN_AND_MEAN
135 # include <windows.h>
136 # ifndef EV_SELECT_IS_WINSOCKET
137 # define EV_SELECT_IS_WINSOCKET 1
138 # endif
139 #endif
140
141 /**/
142
143 #ifndef EV_USE_MONOTONIC
144 # define EV_USE_MONOTONIC 0
145 #endif
146
147 #ifndef EV_USE_REALTIME
148 # define EV_USE_REALTIME 0
149 #endif
150
151 #ifndef EV_USE_SELECT
152 # define EV_USE_SELECT 1
153 #endif
154
155 #ifndef EV_USE_POLL
156 # ifdef _WIN32
157 # define EV_USE_POLL 0
158 # else
159 # define EV_USE_POLL 1
160 # endif
161 #endif
162
163 #ifndef EV_USE_EPOLL
164 # define EV_USE_EPOLL 0
165 #endif
166
167 #ifndef EV_USE_KQUEUE
168 # define EV_USE_KQUEUE 0
169 #endif
170
171 #ifndef EV_USE_PORT
172 # define EV_USE_PORT 0
173 #endif
174
175 #ifndef EV_USE_INOTIFY
176 # define EV_USE_INOTIFY 0
177 #endif
178
179 #ifndef EV_PID_HASHSIZE
180 # if EV_MINIMAL
181 # define EV_PID_HASHSIZE 1
182 # else
183 # define EV_PID_HASHSIZE 16
184 # endif
185 #endif
186
187 #ifndef EV_INOTIFY_HASHSIZE
188 # if EV_MINIMAL
189 # define EV_INOTIFY_HASHSIZE 1
190 # else
191 # define EV_INOTIFY_HASHSIZE 16
192 # endif
193 #endif
194
195 /**/
196
197 #ifndef CLOCK_MONOTONIC
198 # undef EV_USE_MONOTONIC
199 # define EV_USE_MONOTONIC 0
200 #endif
201
202 #ifndef CLOCK_REALTIME
203 # undef EV_USE_REALTIME
204 # define EV_USE_REALTIME 0
205 #endif
206
207 #if EV_SELECT_IS_WINSOCKET
208 # include <winsock.h>
209 #endif
210
211 #if !EV_STAT_ENABLE
212 # define EV_USE_INOTIFY 0
213 #endif
214
215 #if EV_USE_INOTIFY
216 # include <sys/inotify.h>
217 #endif
218
219 /**/
220
221 /*
222 * This is used to avoid floating point rounding problems.
223 * It is added to ev_rt_now when scheduling periodics
224 * to ensure progress, time-wise, even when rounding
225 * errors are against us.
226 * This value is good at least till the year 4000.
227 * Better solutions welcome.
228 */
229 #define TIME_EPSILON 0.0001220703125 /* 1/8192 */
230
231 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
232 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
233 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
234
235 #if __GNUC__ >= 3
236 # define expect(expr,value) __builtin_expect ((expr),(value))
237 # define noinline __attribute__ ((noinline))
238 #else
239 # define expect(expr,value) (expr)
240 # define noinline
241 # if __STDC_VERSION__ < 199901L
242 # define inline
243 # endif
244 #endif
245
246 #define expect_false(expr) expect ((expr) != 0, 0)
247 #define expect_true(expr) expect ((expr) != 0, 1)
248 #define inline_size static inline
249
250 #if EV_MINIMAL
251 # define inline_speed static noinline
252 #else
253 # define inline_speed static inline
254 #endif
255
256 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
257 #define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
258
259 #define EMPTY /* required for microsofts broken pseudo-c compiler */
260 #define EMPTY2(a,b) /* used to suppress some warnings */
261
262 typedef ev_watcher *W;
263 typedef ev_watcher_list *WL;
264 typedef ev_watcher_time *WT;
265
266 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
267
268 #ifdef _WIN32
269 # include "ev_win32.c"
270 #endif
271
272 /*****************************************************************************/
273
274 static void (*syserr_cb)(const char *msg);
275
276 void
277 ev_set_syserr_cb (void (*cb)(const char *msg))
278 {
279 syserr_cb = cb;
280 }
281
282 static void noinline
283 syserr (const char *msg)
284 {
285 if (!msg)
286 msg = "(libev) system error";
287
288 if (syserr_cb)
289 syserr_cb (msg);
290 else
291 {
292 perror (msg);
293 abort ();
294 }
295 }
296
297 static void *(*alloc)(void *ptr, long size);
298
299 void
300 ev_set_allocator (void *(*cb)(void *ptr, long size))
301 {
302 alloc = cb;
303 }
304
305 inline_speed void *
306 ev_realloc (void *ptr, long size)
307 {
308 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
309
310 if (!ptr && size)
311 {
312 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
313 abort ();
314 }
315
316 return ptr;
317 }
318
319 #define ev_malloc(size) ev_realloc (0, (size))
320 #define ev_free(ptr) ev_realloc ((ptr), 0)
321
322 /*****************************************************************************/
323
324 typedef struct
325 {
326 WL head;
327 unsigned char events;
328 unsigned char reify;
329 #if EV_SELECT_IS_WINSOCKET
330 SOCKET handle;
331 #endif
332 } ANFD;
333
334 typedef struct
335 {
336 W w;
337 int events;
338 } ANPENDING;
339
340 #if EV_USE_INOTIFY
341 typedef struct
342 {
343 WL head;
344 } ANFS;
345 #endif
346
347 #if EV_MULTIPLICITY
348
349 struct ev_loop
350 {
351 ev_tstamp ev_rt_now;
352 #define ev_rt_now ((loop)->ev_rt_now)
353 #define VAR(name,decl) decl;
354 #include "ev_vars.h"
355 #undef VAR
356 };
357 #include "ev_wrap.h"
358
359 static struct ev_loop default_loop_struct;
360 struct ev_loop *ev_default_loop_ptr;
361
362 #else
363
364 ev_tstamp ev_rt_now;
365 #define VAR(name,decl) static decl;
366 #include "ev_vars.h"
367 #undef VAR
368
369 static int ev_default_loop_ptr;
370
371 #endif
372
373 /*****************************************************************************/
374
375 ev_tstamp
376 ev_time (void)
377 {
378 #if EV_USE_REALTIME
379 struct timespec ts;
380 clock_gettime (CLOCK_REALTIME, &ts);
381 return ts.tv_sec + ts.tv_nsec * 1e-9;
382 #else
383 struct timeval tv;
384 gettimeofday (&tv, 0);
385 return tv.tv_sec + tv.tv_usec * 1e-6;
386 #endif
387 }
388
389 ev_tstamp inline_size
390 get_clock (void)
391 {
392 #if EV_USE_MONOTONIC
393 if (expect_true (have_monotonic))
394 {
395 struct timespec ts;
396 clock_gettime (CLOCK_MONOTONIC, &ts);
397 return ts.tv_sec + ts.tv_nsec * 1e-9;
398 }
399 #endif
400
401 return ev_time ();
402 }
403
404 #if EV_MULTIPLICITY
405 ev_tstamp
406 ev_now (EV_P)
407 {
408 return ev_rt_now;
409 }
410 #endif
411
412 int inline_size
413 array_nextsize (int elem, int cur, int cnt)
414 {
415 int ncur = cur + 1;
416
417 do
418 ncur <<= 1;
419 while (cnt > ncur);
420
421 /* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
422 if (elem * ncur > 4096)
423 {
424 ncur *= elem;
425 ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
426 ncur = ncur - sizeof (void *) * 4;
427 ncur /= elem;
428 }
429
430 return ncur;
431 }
432
433 static noinline void *
434 array_realloc (int elem, void *base, int *cur, int cnt)
435 {
436 *cur = array_nextsize (elem, *cur, cnt);
437 return ev_realloc (base, elem * *cur);
438 }
439
440 #define array_needsize(type,base,cur,cnt,init) \
441 if (expect_false ((cnt) > (cur))) \
442 { \
443 int ocur_ = (cur); \
444 (base) = (type *)array_realloc \
445 (sizeof (type), (base), &(cur), (cnt)); \
446 init ((base) + (ocur_), (cur) - ocur_); \
447 }
448
449 #if 0
450 #define array_slim(type,stem) \
451 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
452 { \
453 stem ## max = array_roundsize (stem ## cnt >> 1); \
454 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
455 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
456 }
457 #endif
458
459 #define array_free(stem, idx) \
460 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
461
462 /*****************************************************************************/
463
464 void noinline
465 ev_feed_event (EV_P_ void *w, int revents)
466 {
467 W w_ = (W)w;
468 int pri = ABSPRI (w_);
469
470 if (expect_false (w_->pending))
471 pendings [pri][w_->pending - 1].events |= revents;
472 else
473 {
474 w_->pending = ++pendingcnt [pri];
475 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
476 pendings [pri][w_->pending - 1].w = w_;
477 pendings [pri][w_->pending - 1].events = revents;
478 }
479 }
480
481 void inline_speed
482 queue_events (EV_P_ W *events, int eventcnt, int type)
483 {
484 int i;
485
486 for (i = 0; i < eventcnt; ++i)
487 ev_feed_event (EV_A_ events [i], type);
488 }
489
490 /*****************************************************************************/
491
492 void inline_size
493 anfds_init (ANFD *base, int count)
494 {
495 while (count--)
496 {
497 base->head = 0;
498 base->events = EV_NONE;
499 base->reify = 0;
500
501 ++base;
502 }
503 }
504
505 void inline_speed
506 fd_event (EV_P_ int fd, int revents)
507 {
508 ANFD *anfd = anfds + fd;
509 ev_io *w;
510
511 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
512 {
513 int ev = w->events & revents;
514
515 if (ev)
516 ev_feed_event (EV_A_ (W)w, ev);
517 }
518 }
519
520 void
521 ev_feed_fd_event (EV_P_ int fd, int revents)
522 {
523 if (fd >= 0 && fd < anfdmax)
524 fd_event (EV_A_ fd, revents);
525 }
526
527 void inline_size
528 fd_reify (EV_P)
529 {
530 int i;
531
532 for (i = 0; i < fdchangecnt; ++i)
533 {
534 int fd = fdchanges [i];
535 ANFD *anfd = anfds + fd;
536 ev_io *w;
537
538 int events = 0;
539
540 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
541 events |= w->events;
542
543 #if EV_SELECT_IS_WINSOCKET
544 if (events)
545 {
546 unsigned long argp;
547 anfd->handle = _get_osfhandle (fd);
548 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
549 }
550 #endif
551
552 anfd->reify = 0;
553
554 backend_modify (EV_A_ fd, anfd->events, events);
555 anfd->events = events;
556 }
557
558 fdchangecnt = 0;
559 }
560
561 void inline_size
562 fd_change (EV_P_ int fd, int flags)
563 {
564 unsigned char reify = anfds [fd].reify;
565 anfds [fd].reify |= flags | 1;
566
567 if (expect_true (!reify))
568 {
569 ++fdchangecnt;
570 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
571 fdchanges [fdchangecnt - 1] = fd;
572 }
573 }
574
575 void inline_speed
576 fd_kill (EV_P_ int fd)
577 {
578 ev_io *w;
579
580 while ((w = (ev_io *)anfds [fd].head))
581 {
582 ev_io_stop (EV_A_ w);
583 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
584 }
585 }
586
587 int inline_size
588 fd_valid (int fd)
589 {
590 #ifdef _WIN32
591 return _get_osfhandle (fd) != -1;
592 #else
593 return fcntl (fd, F_GETFD) != -1;
594 #endif
595 }
596
597 /* called on EBADF to verify fds */
598 static void noinline
599 fd_ebadf (EV_P)
600 {
601 int fd;
602
603 for (fd = 0; fd < anfdmax; ++fd)
604 if (anfds [fd].events)
605 if (!fd_valid (fd) == -1 && errno == EBADF)
606 fd_kill (EV_A_ fd);
607 }
608
609 /* called on ENOMEM in select/poll to kill some fds and retry */
610 static void noinline
611 fd_enomem (EV_P)
612 {
613 int fd;
614
615 for (fd = anfdmax; fd--; )
616 if (anfds [fd].events)
617 {
618 fd_kill (EV_A_ fd);
619 return;
620 }
621 }
622
623 /* usually called after fork if backend needs to re-arm all fds from scratch */
624 static void noinline
625 fd_rearm_all (EV_P)
626 {
627 int fd;
628
629 for (fd = 0; fd < anfdmax; ++fd)
630 if (anfds [fd].events)
631 {
632 anfds [fd].events = 0;
633 fd_change (EV_A_ fd, EV_IOFDSET);
634 }
635 }
636
637 /*****************************************************************************/
638
639 void inline_speed
640 upheap (WT *heap, int k)
641 {
642 WT w = heap [k];
643
644 while (k)
645 {
646 int p = (k - 1) >> 1;
647
648 if (heap [p]->at <= w->at)
649 break;
650
651 heap [k] = heap [p];
652 ((W)heap [k])->active = k + 1;
653 k = p;
654 }
655
656 heap [k] = w;
657 ((W)heap [k])->active = k + 1;
658 }
659
660 void inline_speed
661 downheap (WT *heap, int N, int k)
662 {
663 WT w = heap [k];
664
665 for (;;)
666 {
667 int c = (k << 1) + 1;
668
669 if (c >= N)
670 break;
671
672 c += c + 1 < N && heap [c]->at > heap [c + 1]->at
673 ? 1 : 0;
674
675 if (w->at <= heap [c]->at)
676 break;
677
678 heap [k] = heap [c];
679 ((W)heap [k])->active = k + 1;
680
681 k = c;
682 }
683
684 heap [k] = w;
685 ((W)heap [k])->active = k + 1;
686 }
687
688 void inline_size
689 adjustheap (WT *heap, int N, int k)
690 {
691 upheap (heap, k);
692 downheap (heap, N, k);
693 }
694
695 /*****************************************************************************/
696
697 typedef struct
698 {
699 WL head;
700 sig_atomic_t volatile gotsig;
701 } ANSIG;
702
703 static ANSIG *signals;
704 static int signalmax;
705
706 static int sigpipe [2];
707 static sig_atomic_t volatile gotsig;
708 static ev_io sigev;
709
710 void inline_size
711 signals_init (ANSIG *base, int count)
712 {
713 while (count--)
714 {
715 base->head = 0;
716 base->gotsig = 0;
717
718 ++base;
719 }
720 }
721
722 static void
723 sighandler (int signum)
724 {
725 #if _WIN32
726 signal (signum, sighandler);
727 #endif
728
729 signals [signum - 1].gotsig = 1;
730
731 if (!gotsig)
732 {
733 int old_errno = errno;
734 gotsig = 1;
735 write (sigpipe [1], &signum, 1);
736 errno = old_errno;
737 }
738 }
739
740 void noinline
741 ev_feed_signal_event (EV_P_ int signum)
742 {
743 WL w;
744
745 #if EV_MULTIPLICITY
746 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
747 #endif
748
749 --signum;
750
751 if (signum < 0 || signum >= signalmax)
752 return;
753
754 signals [signum].gotsig = 0;
755
756 for (w = signals [signum].head; w; w = w->next)
757 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
758 }
759
760 static void
761 sigcb (EV_P_ ev_io *iow, int revents)
762 {
763 int signum;
764
765 read (sigpipe [0], &revents, 1);
766 gotsig = 0;
767
768 for (signum = signalmax; signum--; )
769 if (signals [signum].gotsig)
770 ev_feed_signal_event (EV_A_ signum + 1);
771 }
772
773 void inline_speed
774 fd_intern (int fd)
775 {
776 #ifdef _WIN32
777 int arg = 1;
778 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
779 #else
780 fcntl (fd, F_SETFD, FD_CLOEXEC);
781 fcntl (fd, F_SETFL, O_NONBLOCK);
782 #endif
783 }
784
785 static void noinline
786 siginit (EV_P)
787 {
788 fd_intern (sigpipe [0]);
789 fd_intern (sigpipe [1]);
790
791 ev_io_set (&sigev, sigpipe [0], EV_READ);
792 ev_io_start (EV_A_ &sigev);
793 ev_unref (EV_A); /* child watcher should not keep loop alive */
794 }
795
796 /*****************************************************************************/
797
798 static WL childs [EV_PID_HASHSIZE];
799
800 #ifndef _WIN32
801
802 static ev_signal childev;
803
804 void inline_speed
805 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
806 {
807 ev_child *w;
808
809 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
810 if (w->pid == pid || !w->pid)
811 {
812 ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
813 w->rpid = pid;
814 w->rstatus = status;
815 ev_feed_event (EV_A_ (W)w, EV_CHILD);
816 }
817 }
818
819 #ifndef WCONTINUED
820 # define WCONTINUED 0
821 #endif
822
823 static void
824 childcb (EV_P_ ev_signal *sw, int revents)
825 {
826 int pid, status;
827
828 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
829 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
830 if (!WCONTINUED
831 || errno != EINVAL
832 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
833 return;
834
835 /* make sure we are called again until all childs have been reaped */
836 /* we need to do it this way so that the callback gets called before we continue */
837 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
838
839 child_reap (EV_A_ sw, pid, pid, status);
840 if (EV_PID_HASHSIZE > 1)
841 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
842 }
843
844 #endif
845
846 /*****************************************************************************/
847
848 #if EV_USE_PORT
849 # include "ev_port.c"
850 #endif
851 #if EV_USE_KQUEUE
852 # include "ev_kqueue.c"
853 #endif
854 #if EV_USE_EPOLL
855 # include "ev_epoll.c"
856 #endif
857 #if EV_USE_POLL
858 # include "ev_poll.c"
859 #endif
860 #if EV_USE_SELECT
861 # include "ev_select.c"
862 #endif
863
864 int
865 ev_version_major (void)
866 {
867 return EV_VERSION_MAJOR;
868 }
869
870 int
871 ev_version_minor (void)
872 {
873 return EV_VERSION_MINOR;
874 }
875
876 /* return true if we are running with elevated privileges and should ignore env variables */
877 int inline_size
878 enable_secure (void)
879 {
880 #ifdef _WIN32
881 return 0;
882 #else
883 return getuid () != geteuid ()
884 || getgid () != getegid ();
885 #endif
886 }
887
888 unsigned int
889 ev_supported_backends (void)
890 {
891 unsigned int flags = 0;
892
893 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
894 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
895 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
896 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
897 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
898
899 return flags;
900 }
901
902 unsigned int
903 ev_recommended_backends (void)
904 {
905 unsigned int flags = ev_supported_backends ();
906
907 #ifndef __NetBSD__
908 /* kqueue is borked on everything but netbsd apparently */
909 /* it usually doesn't work correctly on anything but sockets and pipes */
910 flags &= ~EVBACKEND_KQUEUE;
911 #endif
912 #ifdef __APPLE__
913 // flags &= ~EVBACKEND_KQUEUE; for documentation
914 flags &= ~EVBACKEND_POLL;
915 #endif
916
917 return flags;
918 }
919
920 unsigned int
921 ev_embeddable_backends (void)
922 {
923 return EVBACKEND_EPOLL
924 | EVBACKEND_KQUEUE
925 | EVBACKEND_PORT;
926 }
927
928 unsigned int
929 ev_backend (EV_P)
930 {
931 return backend;
932 }
933
934 unsigned int
935 ev_loop_count (EV_P)
936 {
937 return loop_count;
938 }
939
940 static void noinline
941 loop_init (EV_P_ unsigned int flags)
942 {
943 if (!backend)
944 {
945 #if EV_USE_MONOTONIC
946 {
947 struct timespec ts;
948 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
949 have_monotonic = 1;
950 }
951 #endif
952
953 ev_rt_now = ev_time ();
954 mn_now = get_clock ();
955 now_floor = mn_now;
956 rtmn_diff = ev_rt_now - mn_now;
957
958 /* pid check not overridable via env */
959 #ifndef _WIN32
960 if (flags & EVFLAG_FORKCHECK)
961 curpid = getpid ();
962 #endif
963
964 if (!(flags & EVFLAG_NOENV)
965 && !enable_secure ()
966 && getenv ("LIBEV_FLAGS"))
967 flags = atoi (getenv ("LIBEV_FLAGS"));
968
969 if (!(flags & 0x0000ffffUL))
970 flags |= ev_recommended_backends ();
971
972 backend = 0;
973 backend_fd = -1;
974 #if EV_USE_INOTIFY
975 fs_fd = -2;
976 #endif
977
978 #if EV_USE_PORT
979 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
980 #endif
981 #if EV_USE_KQUEUE
982 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
983 #endif
984 #if EV_USE_EPOLL
985 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
986 #endif
987 #if EV_USE_POLL
988 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
989 #endif
990 #if EV_USE_SELECT
991 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
992 #endif
993
994 ev_init (&sigev, sigcb);
995 ev_set_priority (&sigev, EV_MAXPRI);
996 }
997 }
998
999 static void noinline
1000 loop_destroy (EV_P)
1001 {
1002 int i;
1003
1004 #if EV_USE_INOTIFY
1005 if (fs_fd >= 0)
1006 close (fs_fd);
1007 #endif
1008
1009 if (backend_fd >= 0)
1010 close (backend_fd);
1011
1012 #if EV_USE_PORT
1013 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1014 #endif
1015 #if EV_USE_KQUEUE
1016 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1017 #endif
1018 #if EV_USE_EPOLL
1019 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1020 #endif
1021 #if EV_USE_POLL
1022 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1023 #endif
1024 #if EV_USE_SELECT
1025 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1026 #endif
1027
1028 for (i = NUMPRI; i--; )
1029 {
1030 array_free (pending, [i]);
1031 #if EV_IDLE_ENABLE
1032 array_free (idle, [i]);
1033 #endif
1034 }
1035
1036 /* have to use the microsoft-never-gets-it-right macro */
1037 array_free (fdchange, EMPTY);
1038 array_free (timer, EMPTY);
1039 #if EV_PERIODIC_ENABLE
1040 array_free (periodic, EMPTY);
1041 #endif
1042 array_free (prepare, EMPTY);
1043 array_free (check, EMPTY);
1044
1045 backend = 0;
1046 }
1047
1048 void inline_size infy_fork (EV_P);
1049
1050 void inline_size
1051 loop_fork (EV_P)
1052 {
1053 #if EV_USE_PORT
1054 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1055 #endif
1056 #if EV_USE_KQUEUE
1057 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1058 #endif
1059 #if EV_USE_EPOLL
1060 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1061 #endif
1062 #if EV_USE_INOTIFY
1063 infy_fork (EV_A);
1064 #endif
1065
1066 if (ev_is_active (&sigev))
1067 {
1068 /* default loop */
1069
1070 ev_ref (EV_A);
1071 ev_io_stop (EV_A_ &sigev);
1072 close (sigpipe [0]);
1073 close (sigpipe [1]);
1074
1075 while (pipe (sigpipe))
1076 syserr ("(libev) error creating pipe");
1077
1078 siginit (EV_A);
1079 }
1080
1081 postfork = 0;
1082 }
1083
1084 #if EV_MULTIPLICITY
1085 struct ev_loop *
1086 ev_loop_new (unsigned int flags)
1087 {
1088 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1089
1090 memset (loop, 0, sizeof (struct ev_loop));
1091
1092 loop_init (EV_A_ flags);
1093
1094 if (ev_backend (EV_A))
1095 return loop;
1096
1097 return 0;
1098 }
1099
1100 void
1101 ev_loop_destroy (EV_P)
1102 {
1103 loop_destroy (EV_A);
1104 ev_free (loop);
1105 }
1106
1107 void
1108 ev_loop_fork (EV_P)
1109 {
1110 postfork = 1;
1111 }
1112
1113 #endif
1114
1115 #if EV_MULTIPLICITY
1116 struct ev_loop *
1117 ev_default_loop_init (unsigned int flags)
1118 #else
1119 int
1120 ev_default_loop (unsigned int flags)
1121 #endif
1122 {
1123 if (sigpipe [0] == sigpipe [1])
1124 if (pipe (sigpipe))
1125 return 0;
1126
1127 if (!ev_default_loop_ptr)
1128 {
1129 #if EV_MULTIPLICITY
1130 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1131 #else
1132 ev_default_loop_ptr = 1;
1133 #endif
1134
1135 loop_init (EV_A_ flags);
1136
1137 if (ev_backend (EV_A))
1138 {
1139 siginit (EV_A);
1140
1141 #ifndef _WIN32
1142 ev_signal_init (&childev, childcb, SIGCHLD);
1143 ev_set_priority (&childev, EV_MAXPRI);
1144 ev_signal_start (EV_A_ &childev);
1145 ev_unref (EV_A); /* child watcher should not keep loop alive */
1146 #endif
1147 }
1148 else
1149 ev_default_loop_ptr = 0;
1150 }
1151
1152 return ev_default_loop_ptr;
1153 }
1154
1155 void
1156 ev_default_destroy (void)
1157 {
1158 #if EV_MULTIPLICITY
1159 struct ev_loop *loop = ev_default_loop_ptr;
1160 #endif
1161
1162 #ifndef _WIN32
1163 ev_ref (EV_A); /* child watcher */
1164 ev_signal_stop (EV_A_ &childev);
1165 #endif
1166
1167 ev_ref (EV_A); /* signal watcher */
1168 ev_io_stop (EV_A_ &sigev);
1169
1170 close (sigpipe [0]); sigpipe [0] = 0;
1171 close (sigpipe [1]); sigpipe [1] = 0;
1172
1173 loop_destroy (EV_A);
1174 }
1175
1176 void
1177 ev_default_fork (void)
1178 {
1179 #if EV_MULTIPLICITY
1180 struct ev_loop *loop = ev_default_loop_ptr;
1181 #endif
1182
1183 if (backend)
1184 postfork = 1;
1185 }
1186
1187 /*****************************************************************************/
1188
1189 void
1190 ev_invoke (EV_P_ void *w, int revents)
1191 {
1192 EV_CB_INVOKE ((W)w, revents);
1193 }
1194
1195 void inline_speed
1196 call_pending (EV_P)
1197 {
1198 int pri;
1199
1200 for (pri = NUMPRI; pri--; )
1201 while (pendingcnt [pri])
1202 {
1203 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1204
1205 if (expect_true (p->w))
1206 {
1207 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1208
1209 p->w->pending = 0;
1210 EV_CB_INVOKE (p->w, p->events);
1211 }
1212 }
1213 }
1214
1215 void inline_size
1216 timers_reify (EV_P)
1217 {
1218 while (timercnt && ((WT)timers [0])->at <= mn_now)
1219 {
1220 ev_timer *w = (ev_timer *)timers [0];
1221
1222 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1223
1224 /* first reschedule or stop timer */
1225 if (w->repeat)
1226 {
1227 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1228
1229 ((WT)w)->at += w->repeat;
1230 if (((WT)w)->at < mn_now)
1231 ((WT)w)->at = mn_now;
1232
1233 downheap (timers, timercnt, 0);
1234 }
1235 else
1236 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1237
1238 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1239 }
1240 }
1241
1242 #if EV_PERIODIC_ENABLE
1243 void inline_size
1244 periodics_reify (EV_P)
1245 {
1246 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1247 {
1248 ev_periodic *w = (ev_periodic *)periodics [0];
1249
1250 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1251
1252 /* first reschedule or stop timer */
1253 if (w->reschedule_cb)
1254 {
1255 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
1256 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1257 downheap (periodics, periodiccnt, 0);
1258 }
1259 else if (w->interval)
1260 {
1261 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1262 if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
1263 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1264 downheap (periodics, periodiccnt, 0);
1265 }
1266 else
1267 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1268
1269 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1270 }
1271 }
1272
1273 static void noinline
1274 periodics_reschedule (EV_P)
1275 {
1276 int i;
1277
1278 /* adjust periodics after time jump */
1279 for (i = 0; i < periodiccnt; ++i)
1280 {
1281 ev_periodic *w = (ev_periodic *)periodics [i];
1282
1283 if (w->reschedule_cb)
1284 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1285 else if (w->interval)
1286 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1287 }
1288
1289 /* now rebuild the heap */
1290 for (i = periodiccnt >> 1; i--; )
1291 downheap (periodics, periodiccnt, i);
1292 }
1293 #endif
1294
1295 #if EV_IDLE_ENABLE
1296 void inline_size
1297 idle_reify (EV_P)
1298 {
1299 if (expect_false (idleall))
1300 {
1301 int pri;
1302
1303 for (pri = NUMPRI; pri--; )
1304 {
1305 if (pendingcnt [pri])
1306 break;
1307
1308 if (idlecnt [pri])
1309 {
1310 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
1311 break;
1312 }
1313 }
1314 }
1315 }
1316 #endif
1317
1318 void inline_speed
1319 time_update (EV_P_ ev_tstamp max_block)
1320 {
1321 int i;
1322
1323 #if EV_USE_MONOTONIC
1324 if (expect_true (have_monotonic))
1325 {
1326 ev_tstamp odiff = rtmn_diff;
1327
1328 mn_now = get_clock ();
1329
1330 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
1331 /* interpolate in the meantime */
1332 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1333 {
1334 ev_rt_now = rtmn_diff + mn_now;
1335 return;
1336 }
1337
1338 now_floor = mn_now;
1339 ev_rt_now = ev_time ();
1340
1341 /* loop a few times, before making important decisions.
1342 * on the choice of "4": one iteration isn't enough,
1343 * in case we get preempted during the calls to
1344 * ev_time and get_clock. a second call is almost guaranteed
1345 * to succeed in that case, though. and looping a few more times
1346 * doesn't hurt either as we only do this on time-jumps or
1347 * in the unlikely event of having been preempted here.
1348 */
1349 for (i = 4; --i; )
1350 {
1351 rtmn_diff = ev_rt_now - mn_now;
1352
1353 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1354 return; /* all is well */
1355
1356 ev_rt_now = ev_time ();
1357 mn_now = get_clock ();
1358 now_floor = mn_now;
1359 }
1360
1361 # if EV_PERIODIC_ENABLE
1362 periodics_reschedule (EV_A);
1363 # endif
1364 /* no timer adjustment, as the monotonic clock doesn't jump */
1365 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1366 }
1367 else
1368 #endif
1369 {
1370 ev_rt_now = ev_time ();
1371
1372 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
1373 {
1374 #if EV_PERIODIC_ENABLE
1375 periodics_reschedule (EV_A);
1376 #endif
1377 /* adjust timers. this is easy, as the offset is the same for all of them */
1378 for (i = 0; i < timercnt; ++i)
1379 ((WT)timers [i])->at += ev_rt_now - mn_now;
1380 }
1381
1382 mn_now = ev_rt_now;
1383 }
1384 }
1385
1386 void
1387 ev_ref (EV_P)
1388 {
1389 ++activecnt;
1390 }
1391
1392 void
1393 ev_unref (EV_P)
1394 {
1395 --activecnt;
1396 }
1397
1398 static int loop_done;
1399
1400 void
1401 ev_loop (EV_P_ int flags)
1402 {
1403 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1404 ? EVUNLOOP_ONE
1405 : EVUNLOOP_CANCEL;
1406
1407 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1408
1409 do
1410 {
1411 #ifndef _WIN32
1412 if (expect_false (curpid)) /* penalise the forking check even more */
1413 if (expect_false (getpid () != curpid))
1414 {
1415 curpid = getpid ();
1416 postfork = 1;
1417 }
1418 #endif
1419
1420 #if EV_FORK_ENABLE
1421 /* we might have forked, so queue fork handlers */
1422 if (expect_false (postfork))
1423 if (forkcnt)
1424 {
1425 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1426 call_pending (EV_A);
1427 }
1428 #endif
1429
1430 /* queue prepare watchers (and execute them) */
1431 if (expect_false (preparecnt))
1432 {
1433 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1434 call_pending (EV_A);
1435 }
1436
1437 if (expect_false (!activecnt))
1438 break;
1439
1440 /* we might have forked, so reify kernel state if necessary */
1441 if (expect_false (postfork))
1442 loop_fork (EV_A);
1443
1444 /* update fd-related kernel structures */
1445 fd_reify (EV_A);
1446
1447 /* calculate blocking time */
1448 {
1449 ev_tstamp block;
1450
1451 if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
1452 block = 0.; /* do not block at all */
1453 else
1454 {
1455 /* update time to cancel out callback processing overhead */
1456 time_update (EV_A_ 1e100);
1457
1458 block = MAX_BLOCKTIME;
1459
1460 if (timercnt)
1461 {
1462 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1463 if (block > to) block = to;
1464 }
1465
1466 #if EV_PERIODIC_ENABLE
1467 if (periodiccnt)
1468 {
1469 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1470 if (block > to) block = to;
1471 }
1472 #endif
1473
1474 if (expect_false (block < 0.)) block = 0.;
1475 }
1476
1477 ++loop_count;
1478 backend_poll (EV_A_ block);
1479
1480 /* update ev_rt_now, do magic */
1481 time_update (EV_A_ block);
1482 }
1483
1484 /* queue pending timers and reschedule them */
1485 timers_reify (EV_A); /* relative timers called last */
1486 #if EV_PERIODIC_ENABLE
1487 periodics_reify (EV_A); /* absolute timers called first */
1488 #endif
1489
1490 #if EV_IDLE_ENABLE
1491 /* queue idle watchers unless other events are pending */
1492 idle_reify (EV_A);
1493 #endif
1494
1495 /* queue check watchers, to be executed first */
1496 if (expect_false (checkcnt))
1497 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1498
1499 call_pending (EV_A);
1500
1501 }
1502 while (expect_true (activecnt && !loop_done));
1503
1504 if (loop_done == EVUNLOOP_ONE)
1505 loop_done = EVUNLOOP_CANCEL;
1506 }
1507
1508 void
1509 ev_unloop (EV_P_ int how)
1510 {
1511 loop_done = how;
1512 }
1513
1514 /*****************************************************************************/
1515
1516 void inline_size
1517 wlist_add (WL *head, WL elem)
1518 {
1519 elem->next = *head;
1520 *head = elem;
1521 }
1522
1523 void inline_size
1524 wlist_del (WL *head, WL elem)
1525 {
1526 while (*head)
1527 {
1528 if (*head == elem)
1529 {
1530 *head = elem->next;
1531 return;
1532 }
1533
1534 head = &(*head)->next;
1535 }
1536 }
1537
1538 void inline_speed
1539 clear_pending (EV_P_ W w)
1540 {
1541 if (w->pending)
1542 {
1543 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1544 w->pending = 0;
1545 }
1546 }
1547
1548 int
1549 ev_clear_pending (EV_P_ void *w)
1550 {
1551 W w_ = (W)w;
1552 int pending = w_->pending;
1553
1554 if (expect_true (pending))
1555 {
1556 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
1557 w_->pending = 0;
1558 p->w = 0;
1559 return p->events;
1560 }
1561 else
1562 return 0;
1563 }
1564
1565 void inline_size
1566 pri_adjust (EV_P_ W w)
1567 {
1568 int pri = w->priority;
1569 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
1570 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
1571 w->priority = pri;
1572 }
1573
1574 void inline_speed
1575 ev_start (EV_P_ W w, int active)
1576 {
1577 pri_adjust (EV_A_ w);
1578 w->active = active;
1579 ev_ref (EV_A);
1580 }
1581
1582 void inline_size
1583 ev_stop (EV_P_ W w)
1584 {
1585 ev_unref (EV_A);
1586 w->active = 0;
1587 }
1588
1589 /*****************************************************************************/
1590
1591 void noinline
1592 ev_io_start (EV_P_ ev_io *w)
1593 {
1594 int fd = w->fd;
1595
1596 if (expect_false (ev_is_active (w)))
1597 return;
1598
1599 assert (("ev_io_start called with negative fd", fd >= 0));
1600
1601 ev_start (EV_A_ (W)w, 1);
1602 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1603 wlist_add (&anfds[fd].head, (WL)w);
1604
1605 fd_change (EV_A_ fd, w->events & EV_IOFDSET);
1606 w->events &= ~ EV_IOFDSET;
1607 }
1608
1609 void noinline
1610 ev_io_stop (EV_P_ ev_io *w)
1611 {
1612 clear_pending (EV_A_ (W)w);
1613 if (expect_false (!ev_is_active (w)))
1614 return;
1615
1616 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1617
1618 wlist_del (&anfds[w->fd].head, (WL)w);
1619 ev_stop (EV_A_ (W)w);
1620
1621 fd_change (EV_A_ w->fd, 0);
1622 }
1623
1624 void noinline
1625 ev_timer_start (EV_P_ ev_timer *w)
1626 {
1627 if (expect_false (ev_is_active (w)))
1628 return;
1629
1630 ((WT)w)->at += mn_now;
1631
1632 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1633
1634 ev_start (EV_A_ (W)w, ++timercnt);
1635 array_needsize (WT, timers, timermax, timercnt, EMPTY2);
1636 timers [timercnt - 1] = (WT)w;
1637 upheap (timers, timercnt - 1);
1638
1639 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1640 }
1641
1642 void noinline
1643 ev_timer_stop (EV_P_ ev_timer *w)
1644 {
1645 clear_pending (EV_A_ (W)w);
1646 if (expect_false (!ev_is_active (w)))
1647 return;
1648
1649 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
1650
1651 {
1652 int active = ((W)w)->active;
1653
1654 if (expect_true (--active < --timercnt))
1655 {
1656 timers [active] = timers [timercnt];
1657 adjustheap (timers, timercnt, active);
1658 }
1659 }
1660
1661 ((WT)w)->at -= mn_now;
1662
1663 ev_stop (EV_A_ (W)w);
1664 }
1665
1666 void noinline
1667 ev_timer_again (EV_P_ ev_timer *w)
1668 {
1669 if (ev_is_active (w))
1670 {
1671 if (w->repeat)
1672 {
1673 ((WT)w)->at = mn_now + w->repeat;
1674 adjustheap (timers, timercnt, ((W)w)->active - 1);
1675 }
1676 else
1677 ev_timer_stop (EV_A_ w);
1678 }
1679 else if (w->repeat)
1680 {
1681 w->at = w->repeat;
1682 ev_timer_start (EV_A_ w);
1683 }
1684 }
1685
1686 #if EV_PERIODIC_ENABLE
1687 void noinline
1688 ev_periodic_start (EV_P_ ev_periodic *w)
1689 {
1690 if (expect_false (ev_is_active (w)))
1691 return;
1692
1693 if (w->reschedule_cb)
1694 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1695 else if (w->interval)
1696 {
1697 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1698 /* this formula differs from the one in periodic_reify because we do not always round up */
1699 ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
1700 }
1701 else
1702 ((WT)w)->at = w->offset;
1703
1704 ev_start (EV_A_ (W)w, ++periodiccnt);
1705 array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
1706 periodics [periodiccnt - 1] = (WT)w;
1707 upheap (periodics, periodiccnt - 1);
1708
1709 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1710 }
1711
1712 void noinline
1713 ev_periodic_stop (EV_P_ ev_periodic *w)
1714 {
1715 clear_pending (EV_A_ (W)w);
1716 if (expect_false (!ev_is_active (w)))
1717 return;
1718
1719 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
1720
1721 {
1722 int active = ((W)w)->active;
1723
1724 if (expect_true (--active < --periodiccnt))
1725 {
1726 periodics [active] = periodics [periodiccnt];
1727 adjustheap (periodics, periodiccnt, active);
1728 }
1729 }
1730
1731 ev_stop (EV_A_ (W)w);
1732 }
1733
1734 void noinline
1735 ev_periodic_again (EV_P_ ev_periodic *w)
1736 {
1737 /* TODO: use adjustheap and recalculation */
1738 ev_periodic_stop (EV_A_ w);
1739 ev_periodic_start (EV_A_ w);
1740 }
1741 #endif
1742
1743 #ifndef SA_RESTART
1744 # define SA_RESTART 0
1745 #endif
1746
1747 void noinline
1748 ev_signal_start (EV_P_ ev_signal *w)
1749 {
1750 #if EV_MULTIPLICITY
1751 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1752 #endif
1753 if (expect_false (ev_is_active (w)))
1754 return;
1755
1756 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1757
1758 {
1759 #ifndef _WIN32
1760 sigset_t full, prev;
1761 sigfillset (&full);
1762 sigprocmask (SIG_SETMASK, &full, &prev);
1763 #endif
1764
1765 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1766
1767 #ifndef _WIN32
1768 sigprocmask (SIG_SETMASK, &prev, 0);
1769 #endif
1770 }
1771
1772 ev_start (EV_A_ (W)w, 1);
1773 wlist_add (&signals [w->signum - 1].head, (WL)w);
1774
1775 if (!((WL)w)->next)
1776 {
1777 #if _WIN32
1778 signal (w->signum, sighandler);
1779 #else
1780 struct sigaction sa;
1781 sa.sa_handler = sighandler;
1782 sigfillset (&sa.sa_mask);
1783 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1784 sigaction (w->signum, &sa, 0);
1785 #endif
1786 }
1787 }
1788
1789 void noinline
1790 ev_signal_stop (EV_P_ ev_signal *w)
1791 {
1792 clear_pending (EV_A_ (W)w);
1793 if (expect_false (!ev_is_active (w)))
1794 return;
1795
1796 wlist_del (&signals [w->signum - 1].head, (WL)w);
1797 ev_stop (EV_A_ (W)w);
1798
1799 if (!signals [w->signum - 1].head)
1800 signal (w->signum, SIG_DFL);
1801 }
1802
1803 void
1804 ev_child_start (EV_P_ ev_child *w)
1805 {
1806 #if EV_MULTIPLICITY
1807 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1808 #endif
1809 if (expect_false (ev_is_active (w)))
1810 return;
1811
1812 ev_start (EV_A_ (W)w, 1);
1813 wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1814 }
1815
1816 void
1817 ev_child_stop (EV_P_ ev_child *w)
1818 {
1819 clear_pending (EV_A_ (W)w);
1820 if (expect_false (!ev_is_active (w)))
1821 return;
1822
1823 wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1824 ev_stop (EV_A_ (W)w);
1825 }
1826
1827 #if EV_STAT_ENABLE
1828
1829 # ifdef _WIN32
1830 # undef lstat
1831 # define lstat(a,b) _stati64 (a,b)
1832 # endif
1833
1834 #define DEF_STAT_INTERVAL 5.0074891
1835 #define MIN_STAT_INTERVAL 0.1074891
1836
1837 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1838
1839 #if EV_USE_INOTIFY
1840 # define EV_INOTIFY_BUFSIZE 8192
1841
1842 static void noinline
1843 infy_add (EV_P_ ev_stat *w)
1844 {
1845 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
1846
1847 if (w->wd < 0)
1848 {
1849 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1850
1851 /* monitor some parent directory for speedup hints */
1852 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1853 {
1854 char path [4096];
1855 strcpy (path, w->path);
1856
1857 do
1858 {
1859 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1860 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1861
1862 char *pend = strrchr (path, '/');
1863
1864 if (!pend)
1865 break; /* whoops, no '/', complain to your admin */
1866
1867 *pend = 0;
1868 w->wd = inotify_add_watch (fs_fd, path, mask);
1869 }
1870 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1871 }
1872 }
1873 else
1874 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1875
1876 if (w->wd >= 0)
1877 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1878 }
1879
1880 static void noinline
1881 infy_del (EV_P_ ev_stat *w)
1882 {
1883 int slot;
1884 int wd = w->wd;
1885
1886 if (wd < 0)
1887 return;
1888
1889 w->wd = -2;
1890 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1891 wlist_del (&fs_hash [slot].head, (WL)w);
1892
1893 /* remove this watcher, if others are watching it, they will rearm */
1894 inotify_rm_watch (fs_fd, wd);
1895 }
1896
1897 static void noinline
1898 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1899 {
1900 if (slot < 0)
1901 /* overflow, need to check for all hahs slots */
1902 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1903 infy_wd (EV_A_ slot, wd, ev);
1904 else
1905 {
1906 WL w_;
1907
1908 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1909 {
1910 ev_stat *w = (ev_stat *)w_;
1911 w_ = w_->next; /* lets us remove this watcher and all before it */
1912
1913 if (w->wd == wd || wd == -1)
1914 {
1915 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1916 {
1917 w->wd = -1;
1918 infy_add (EV_A_ w); /* re-add, no matter what */
1919 }
1920
1921 stat_timer_cb (EV_A_ &w->timer, 0);
1922 }
1923 }
1924 }
1925 }
1926
1927 static void
1928 infy_cb (EV_P_ ev_io *w, int revents)
1929 {
1930 char buf [EV_INOTIFY_BUFSIZE];
1931 struct inotify_event *ev = (struct inotify_event *)buf;
1932 int ofs;
1933 int len = read (fs_fd, buf, sizeof (buf));
1934
1935 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1936 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1937 }
1938
1939 void inline_size
1940 infy_init (EV_P)
1941 {
1942 if (fs_fd != -2)
1943 return;
1944
1945 fs_fd = inotify_init ();
1946
1947 if (fs_fd >= 0)
1948 {
1949 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1950 ev_set_priority (&fs_w, EV_MAXPRI);
1951 ev_io_start (EV_A_ &fs_w);
1952 }
1953 }
1954
1955 void inline_size
1956 infy_fork (EV_P)
1957 {
1958 int slot;
1959
1960 if (fs_fd < 0)
1961 return;
1962
1963 close (fs_fd);
1964 fs_fd = inotify_init ();
1965
1966 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1967 {
1968 WL w_ = fs_hash [slot].head;
1969 fs_hash [slot].head = 0;
1970
1971 while (w_)
1972 {
1973 ev_stat *w = (ev_stat *)w_;
1974 w_ = w_->next; /* lets us add this watcher */
1975
1976 w->wd = -1;
1977
1978 if (fs_fd >= 0)
1979 infy_add (EV_A_ w); /* re-add, no matter what */
1980 else
1981 ev_timer_start (EV_A_ &w->timer);
1982 }
1983
1984 }
1985 }
1986
1987 #endif
1988
1989 void
1990 ev_stat_stat (EV_P_ ev_stat *w)
1991 {
1992 if (lstat (w->path, &w->attr) < 0)
1993 w->attr.st_nlink = 0;
1994 else if (!w->attr.st_nlink)
1995 w->attr.st_nlink = 1;
1996 }
1997
1998 static void noinline
1999 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
2000 {
2001 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
2002
2003 /* we copy this here each the time so that */
2004 /* prev has the old value when the callback gets invoked */
2005 w->prev = w->attr;
2006 ev_stat_stat (EV_A_ w);
2007
2008 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
2009 if (
2010 w->prev.st_dev != w->attr.st_dev
2011 || w->prev.st_ino != w->attr.st_ino
2012 || w->prev.st_mode != w->attr.st_mode
2013 || w->prev.st_nlink != w->attr.st_nlink
2014 || w->prev.st_uid != w->attr.st_uid
2015 || w->prev.st_gid != w->attr.st_gid
2016 || w->prev.st_rdev != w->attr.st_rdev
2017 || w->prev.st_size != w->attr.st_size
2018 || w->prev.st_atime != w->attr.st_atime
2019 || w->prev.st_mtime != w->attr.st_mtime
2020 || w->prev.st_ctime != w->attr.st_ctime
2021 ) {
2022 #if EV_USE_INOTIFY
2023 infy_del (EV_A_ w);
2024 infy_add (EV_A_ w);
2025 ev_stat_stat (EV_A_ w); /* avoid race... */
2026 #endif
2027
2028 ev_feed_event (EV_A_ w, EV_STAT);
2029 }
2030 }
2031
2032 void
2033 ev_stat_start (EV_P_ ev_stat *w)
2034 {
2035 if (expect_false (ev_is_active (w)))
2036 return;
2037
2038 /* since we use memcmp, we need to clear any padding data etc. */
2039 memset (&w->prev, 0, sizeof (ev_statdata));
2040 memset (&w->attr, 0, sizeof (ev_statdata));
2041
2042 ev_stat_stat (EV_A_ w);
2043
2044 if (w->interval < MIN_STAT_INTERVAL)
2045 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
2046
2047 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
2048 ev_set_priority (&w->timer, ev_priority (w));
2049
2050 #if EV_USE_INOTIFY
2051 infy_init (EV_A);
2052
2053 if (fs_fd >= 0)
2054 infy_add (EV_A_ w);
2055 else
2056 #endif
2057 ev_timer_start (EV_A_ &w->timer);
2058
2059 ev_start (EV_A_ (W)w, 1);
2060 }
2061
2062 void
2063 ev_stat_stop (EV_P_ ev_stat *w)
2064 {
2065 clear_pending (EV_A_ (W)w);
2066 if (expect_false (!ev_is_active (w)))
2067 return;
2068
2069 #if EV_USE_INOTIFY
2070 infy_del (EV_A_ w);
2071 #endif
2072 ev_timer_stop (EV_A_ &w->timer);
2073
2074 ev_stop (EV_A_ (W)w);
2075 }
2076 #endif
2077
2078 #if EV_IDLE_ENABLE
2079 void
2080 ev_idle_start (EV_P_ ev_idle *w)
2081 {
2082 if (expect_false (ev_is_active (w)))
2083 return;
2084
2085 pri_adjust (EV_A_ (W)w);
2086
2087 {
2088 int active = ++idlecnt [ABSPRI (w)];
2089
2090 ++idleall;
2091 ev_start (EV_A_ (W)w, active);
2092
2093 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
2094 idles [ABSPRI (w)][active - 1] = w;
2095 }
2096 }
2097
2098 void
2099 ev_idle_stop (EV_P_ ev_idle *w)
2100 {
2101 clear_pending (EV_A_ (W)w);
2102 if (expect_false (!ev_is_active (w)))
2103 return;
2104
2105 {
2106 int active = ((W)w)->active;
2107
2108 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
2109 ((W)idles [ABSPRI (w)][active - 1])->active = active;
2110
2111 ev_stop (EV_A_ (W)w);
2112 --idleall;
2113 }
2114 }
2115 #endif
2116
2117 void
2118 ev_prepare_start (EV_P_ ev_prepare *w)
2119 {
2120 if (expect_false (ev_is_active (w)))
2121 return;
2122
2123 ev_start (EV_A_ (W)w, ++preparecnt);
2124 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2125 prepares [preparecnt - 1] = w;
2126 }
2127
2128 void
2129 ev_prepare_stop (EV_P_ ev_prepare *w)
2130 {
2131 clear_pending (EV_A_ (W)w);
2132 if (expect_false (!ev_is_active (w)))
2133 return;
2134
2135 {
2136 int active = ((W)w)->active;
2137 prepares [active - 1] = prepares [--preparecnt];
2138 ((W)prepares [active - 1])->active = active;
2139 }
2140
2141 ev_stop (EV_A_ (W)w);
2142 }
2143
2144 void
2145 ev_check_start (EV_P_ ev_check *w)
2146 {
2147 if (expect_false (ev_is_active (w)))
2148 return;
2149
2150 ev_start (EV_A_ (W)w, ++checkcnt);
2151 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2152 checks [checkcnt - 1] = w;
2153 }
2154
2155 void
2156 ev_check_stop (EV_P_ ev_check *w)
2157 {
2158 clear_pending (EV_A_ (W)w);
2159 if (expect_false (!ev_is_active (w)))
2160 return;
2161
2162 {
2163 int active = ((W)w)->active;
2164 checks [active - 1] = checks [--checkcnt];
2165 ((W)checks [active - 1])->active = active;
2166 }
2167
2168 ev_stop (EV_A_ (W)w);
2169 }
2170
2171 #if EV_EMBED_ENABLE
2172 void noinline
2173 ev_embed_sweep (EV_P_ ev_embed *w)
2174 {
2175 ev_loop (w->loop, EVLOOP_NONBLOCK);
2176 }
2177
2178 static void
2179 embed_cb (EV_P_ ev_io *io, int revents)
2180 {
2181 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2182
2183 if (ev_cb (w))
2184 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2185 else
2186 ev_embed_sweep (loop, w);
2187 }
2188
2189 void
2190 ev_embed_start (EV_P_ ev_embed *w)
2191 {
2192 if (expect_false (ev_is_active (w)))
2193 return;
2194
2195 {
2196 struct ev_loop *loop = w->loop;
2197 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2198 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2199 }
2200
2201 ev_set_priority (&w->io, ev_priority (w));
2202 ev_io_start (EV_A_ &w->io);
2203
2204 ev_start (EV_A_ (W)w, 1);
2205 }
2206
2207 void
2208 ev_embed_stop (EV_P_ ev_embed *w)
2209 {
2210 clear_pending (EV_A_ (W)w);
2211 if (expect_false (!ev_is_active (w)))
2212 return;
2213
2214 ev_io_stop (EV_A_ &w->io);
2215
2216 ev_stop (EV_A_ (W)w);
2217 }
2218 #endif
2219
2220 #if EV_FORK_ENABLE
2221 void
2222 ev_fork_start (EV_P_ ev_fork *w)
2223 {
2224 if (expect_false (ev_is_active (w)))
2225 return;
2226
2227 ev_start (EV_A_ (W)w, ++forkcnt);
2228 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2229 forks [forkcnt - 1] = w;
2230 }
2231
2232 void
2233 ev_fork_stop (EV_P_ ev_fork *w)
2234 {
2235 clear_pending (EV_A_ (W)w);
2236 if (expect_false (!ev_is_active (w)))
2237 return;
2238
2239 {
2240 int active = ((W)w)->active;
2241 forks [active - 1] = forks [--forkcnt];
2242 ((W)forks [active - 1])->active = active;
2243 }
2244
2245 ev_stop (EV_A_ (W)w);
2246 }
2247 #endif
2248
2249 /*****************************************************************************/
2250
2251 struct ev_once
2252 {
2253 ev_io io;
2254 ev_timer to;
2255 void (*cb)(int revents, void *arg);
2256 void *arg;
2257 };
2258
2259 static void
2260 once_cb (EV_P_ struct ev_once *once, int revents)
2261 {
2262 void (*cb)(int revents, void *arg) = once->cb;
2263 void *arg = once->arg;
2264
2265 ev_io_stop (EV_A_ &once->io);
2266 ev_timer_stop (EV_A_ &once->to);
2267 ev_free (once);
2268
2269 cb (revents, arg);
2270 }
2271
2272 static void
2273 once_cb_io (EV_P_ ev_io *w, int revents)
2274 {
2275 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2276 }
2277
2278 static void
2279 once_cb_to (EV_P_ ev_timer *w, int revents)
2280 {
2281 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2282 }
2283
2284 void
2285 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2286 {
2287 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2288
2289 if (expect_false (!once))
2290 {
2291 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2292 return;
2293 }
2294
2295 once->cb = cb;
2296 once->arg = arg;
2297
2298 ev_init (&once->io, once_cb_io);
2299 if (fd >= 0)
2300 {
2301 ev_io_set (&once->io, fd, events);
2302 ev_io_start (EV_A_ &once->io);
2303 }
2304
2305 ev_init (&once->to, once_cb_to);
2306 if (timeout >= 0.)
2307 {
2308 ev_timer_set (&once->to, timeout, 0.);
2309 ev_timer_start (EV_A_ &once->to);
2310 }
2311 }
2312
2313 #ifdef __cplusplus
2314 }
2315 #endif
2316