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Revision: 1.161
Committed: Sat Dec 1 23:43:45 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.160: +2 -3 lines
Log Message:
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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 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
222 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
223 /*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
224
225 #if __GNUC__ >= 3
226 # define expect(expr,value) __builtin_expect ((expr),(value))
227 # define inline_size static inline /* inline for codesize */
228 # if EV_MINIMAL
229 # define noinline __attribute__ ((noinline))
230 # define inline_speed static noinline
231 # else
232 # define noinline
233 # define inline_speed static inline
234 # endif
235 #else
236 # define expect(expr,value) (expr)
237 # define inline_speed static
238 # define inline_size static
239 # define noinline
240 #endif
241
242 #define expect_false(expr) expect ((expr) != 0, 0)
243 #define expect_true(expr) expect ((expr) != 0, 1)
244
245 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
246 #define ABSPRI(w) ((w)->priority - EV_MINPRI)
247
248 #define EMPTY0 /* required for microsofts broken pseudo-c compiler */
249 #define EMPTY2(a,b) /* used to suppress some warnings */
250
251 typedef ev_watcher *W;
252 typedef ev_watcher_list *WL;
253 typedef ev_watcher_time *WT;
254
255 static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
256
257 #ifdef _WIN32
258 # include "ev_win32.c"
259 #endif
260
261 /*****************************************************************************/
262
263 static void (*syserr_cb)(const char *msg);
264
265 void
266 ev_set_syserr_cb (void (*cb)(const char *msg))
267 {
268 syserr_cb = cb;
269 }
270
271 static void noinline
272 syserr (const char *msg)
273 {
274 if (!msg)
275 msg = "(libev) system error";
276
277 if (syserr_cb)
278 syserr_cb (msg);
279 else
280 {
281 perror (msg);
282 abort ();
283 }
284 }
285
286 static void *(*alloc)(void *ptr, long size);
287
288 void
289 ev_set_allocator (void *(*cb)(void *ptr, long size))
290 {
291 alloc = cb;
292 }
293
294 inline_speed void *
295 ev_realloc (void *ptr, long size)
296 {
297 ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
298
299 if (!ptr && size)
300 {
301 fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
302 abort ();
303 }
304
305 return ptr;
306 }
307
308 #define ev_malloc(size) ev_realloc (0, (size))
309 #define ev_free(ptr) ev_realloc ((ptr), 0)
310
311 /*****************************************************************************/
312
313 typedef struct
314 {
315 WL head;
316 unsigned char events;
317 unsigned char reify;
318 #if EV_SELECT_IS_WINSOCKET
319 SOCKET handle;
320 #endif
321 } ANFD;
322
323 typedef struct
324 {
325 W w;
326 int events;
327 } ANPENDING;
328
329 #if EV_USE_INOTIFY
330 typedef struct
331 {
332 WL head;
333 } ANFS;
334 #endif
335
336 #if EV_MULTIPLICITY
337
338 struct ev_loop
339 {
340 ev_tstamp ev_rt_now;
341 #define ev_rt_now ((loop)->ev_rt_now)
342 #define VAR(name,decl) decl;
343 #include "ev_vars.h"
344 #undef VAR
345 };
346 #include "ev_wrap.h"
347
348 static struct ev_loop default_loop_struct;
349 struct ev_loop *ev_default_loop_ptr;
350
351 #else
352
353 ev_tstamp ev_rt_now;
354 #define VAR(name,decl) static decl;
355 #include "ev_vars.h"
356 #undef VAR
357
358 static int ev_default_loop_ptr;
359
360 #endif
361
362 /*****************************************************************************/
363
364 ev_tstamp
365 ev_time (void)
366 {
367 #if EV_USE_REALTIME
368 struct timespec ts;
369 clock_gettime (CLOCK_REALTIME, &ts);
370 return ts.tv_sec + ts.tv_nsec * 1e-9;
371 #else
372 struct timeval tv;
373 gettimeofday (&tv, 0);
374 return tv.tv_sec + tv.tv_usec * 1e-6;
375 #endif
376 }
377
378 ev_tstamp inline_size
379 get_clock (void)
380 {
381 #if EV_USE_MONOTONIC
382 if (expect_true (have_monotonic))
383 {
384 struct timespec ts;
385 clock_gettime (CLOCK_MONOTONIC, &ts);
386 return ts.tv_sec + ts.tv_nsec * 1e-9;
387 }
388 #endif
389
390 return ev_time ();
391 }
392
393 #if EV_MULTIPLICITY
394 ev_tstamp
395 ev_now (EV_P)
396 {
397 return ev_rt_now;
398 }
399 #endif
400
401 #define array_roundsize(type,n) (((n) | 4) & ~3)
402
403 #define array_needsize(type,base,cur,cnt,init) \
404 if (expect_false ((cnt) > cur)) \
405 { \
406 int newcnt = cur; \
407 do \
408 { \
409 newcnt = array_roundsize (type, newcnt << 1); \
410 } \
411 while ((cnt) > newcnt); \
412 \
413 base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
414 init (base + cur, newcnt - cur); \
415 cur = newcnt; \
416 }
417
418 #define array_slim(type,stem) \
419 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
420 { \
421 stem ## max = array_roundsize (stem ## cnt >> 1); \
422 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
423 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
424 }
425
426 #define array_free(stem, idx) \
427 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
428
429 /*****************************************************************************/
430
431 void noinline
432 ev_feed_event (EV_P_ void *w, int revents)
433 {
434 W w_ = (W)w;
435
436 if (expect_false (w_->pending))
437 {
438 pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
439 return;
440 }
441
442 w_->pending = ++pendingcnt [ABSPRI (w_)];
443 array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
444 pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
445 pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
446 }
447
448 void inline_size
449 queue_events (EV_P_ W *events, int eventcnt, int type)
450 {
451 int i;
452
453 for (i = 0; i < eventcnt; ++i)
454 ev_feed_event (EV_A_ events [i], type);
455 }
456
457 /*****************************************************************************/
458
459 void inline_size
460 anfds_init (ANFD *base, int count)
461 {
462 while (count--)
463 {
464 base->head = 0;
465 base->events = EV_NONE;
466 base->reify = 0;
467
468 ++base;
469 }
470 }
471
472 void inline_speed
473 fd_event (EV_P_ int fd, int revents)
474 {
475 ANFD *anfd = anfds + fd;
476 ev_io *w;
477
478 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
479 {
480 int ev = w->events & revents;
481
482 if (ev)
483 ev_feed_event (EV_A_ (W)w, ev);
484 }
485 }
486
487 void
488 ev_feed_fd_event (EV_P_ int fd, int revents)
489 {
490 fd_event (EV_A_ fd, revents);
491 }
492
493 void inline_size
494 fd_reify (EV_P)
495 {
496 int i;
497
498 for (i = 0; i < fdchangecnt; ++i)
499 {
500 int fd = fdchanges [i];
501 ANFD *anfd = anfds + fd;
502 ev_io *w;
503
504 int events = 0;
505
506 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
507 events |= w->events;
508
509 #if EV_SELECT_IS_WINSOCKET
510 if (events)
511 {
512 unsigned long argp;
513 anfd->handle = _get_osfhandle (fd);
514 assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
515 }
516 #endif
517
518 anfd->reify = 0;
519
520 backend_modify (EV_A_ fd, anfd->events, events);
521 anfd->events = events;
522 }
523
524 fdchangecnt = 0;
525 }
526
527 void inline_size
528 fd_change (EV_P_ int fd)
529 {
530 if (expect_false (anfds [fd].reify))
531 return;
532
533 anfds [fd].reify = 1;
534
535 ++fdchangecnt;
536 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
537 fdchanges [fdchangecnt - 1] = fd;
538 }
539
540 void inline_speed
541 fd_kill (EV_P_ int fd)
542 {
543 ev_io *w;
544
545 while ((w = (ev_io *)anfds [fd].head))
546 {
547 ev_io_stop (EV_A_ w);
548 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
549 }
550 }
551
552 int inline_size
553 fd_valid (int fd)
554 {
555 #ifdef _WIN32
556 return _get_osfhandle (fd) != -1;
557 #else
558 return fcntl (fd, F_GETFD) != -1;
559 #endif
560 }
561
562 /* called on EBADF to verify fds */
563 static void noinline
564 fd_ebadf (EV_P)
565 {
566 int fd;
567
568 for (fd = 0; fd < anfdmax; ++fd)
569 if (anfds [fd].events)
570 if (!fd_valid (fd) == -1 && errno == EBADF)
571 fd_kill (EV_A_ fd);
572 }
573
574 /* called on ENOMEM in select/poll to kill some fds and retry */
575 static void noinline
576 fd_enomem (EV_P)
577 {
578 int fd;
579
580 for (fd = anfdmax; fd--; )
581 if (anfds [fd].events)
582 {
583 fd_kill (EV_A_ fd);
584 return;
585 }
586 }
587
588 /* usually called after fork if backend needs to re-arm all fds from scratch */
589 static void noinline
590 fd_rearm_all (EV_P)
591 {
592 int fd;
593
594 for (fd = 0; fd < anfdmax; ++fd)
595 if (anfds [fd].events)
596 {
597 anfds [fd].events = 0;
598 fd_change (EV_A_ fd);
599 }
600 }
601
602 /*****************************************************************************/
603
604 void inline_speed
605 upheap (WT *heap, int k)
606 {
607 WT w = heap [k];
608
609 while (k && heap [k >> 1]->at > w->at)
610 {
611 heap [k] = heap [k >> 1];
612 ((W)heap [k])->active = k + 1;
613 k >>= 1;
614 }
615
616 heap [k] = w;
617 ((W)heap [k])->active = k + 1;
618
619 }
620
621 void inline_speed
622 downheap (WT *heap, int N, int k)
623 {
624 WT w = heap [k];
625
626 while (k < (N >> 1))
627 {
628 int j = k << 1;
629
630 if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
631 ++j;
632
633 if (w->at <= heap [j]->at)
634 break;
635
636 heap [k] = heap [j];
637 ((W)heap [k])->active = k + 1;
638 k = j;
639 }
640
641 heap [k] = w;
642 ((W)heap [k])->active = k + 1;
643 }
644
645 void inline_size
646 adjustheap (WT *heap, int N, int k)
647 {
648 upheap (heap, k);
649 downheap (heap, N, k);
650 }
651
652 /*****************************************************************************/
653
654 typedef struct
655 {
656 WL head;
657 sig_atomic_t volatile gotsig;
658 } ANSIG;
659
660 static ANSIG *signals;
661 static int signalmax;
662
663 static int sigpipe [2];
664 static sig_atomic_t volatile gotsig;
665 static ev_io sigev;
666
667 void inline_size
668 signals_init (ANSIG *base, int count)
669 {
670 while (count--)
671 {
672 base->head = 0;
673 base->gotsig = 0;
674
675 ++base;
676 }
677 }
678
679 static void
680 sighandler (int signum)
681 {
682 #if _WIN32
683 signal (signum, sighandler);
684 #endif
685
686 signals [signum - 1].gotsig = 1;
687
688 if (!gotsig)
689 {
690 int old_errno = errno;
691 gotsig = 1;
692 write (sigpipe [1], &signum, 1);
693 errno = old_errno;
694 }
695 }
696
697 void noinline
698 ev_feed_signal_event (EV_P_ int signum)
699 {
700 WL w;
701
702 #if EV_MULTIPLICITY
703 assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
704 #endif
705
706 --signum;
707
708 if (signum < 0 || signum >= signalmax)
709 return;
710
711 signals [signum].gotsig = 0;
712
713 for (w = signals [signum].head; w; w = w->next)
714 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
715 }
716
717 static void
718 sigcb (EV_P_ ev_io *iow, int revents)
719 {
720 int signum;
721
722 read (sigpipe [0], &revents, 1);
723 gotsig = 0;
724
725 for (signum = signalmax; signum--; )
726 if (signals [signum].gotsig)
727 ev_feed_signal_event (EV_A_ signum + 1);
728 }
729
730 void inline_size
731 fd_intern (int fd)
732 {
733 #ifdef _WIN32
734 int arg = 1;
735 ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
736 #else
737 fcntl (fd, F_SETFD, FD_CLOEXEC);
738 fcntl (fd, F_SETFL, O_NONBLOCK);
739 #endif
740 }
741
742 static void noinline
743 siginit (EV_P)
744 {
745 fd_intern (sigpipe [0]);
746 fd_intern (sigpipe [1]);
747
748 ev_io_set (&sigev, sigpipe [0], EV_READ);
749 ev_io_start (EV_A_ &sigev);
750 ev_unref (EV_A); /* child watcher should not keep loop alive */
751 }
752
753 /*****************************************************************************/
754
755 static ev_child *childs [EV_PID_HASHSIZE];
756
757 #ifndef _WIN32
758
759 static ev_signal childev;
760
761 void inline_speed
762 child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
763 {
764 ev_child *w;
765
766 for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
767 if (w->pid == pid || !w->pid)
768 {
769 ev_priority (w) = ev_priority (sw); /* need to do it *now* */
770 w->rpid = pid;
771 w->rstatus = status;
772 ev_feed_event (EV_A_ (W)w, EV_CHILD);
773 }
774 }
775
776 #ifndef WCONTINUED
777 # define WCONTINUED 0
778 #endif
779
780 static void
781 childcb (EV_P_ ev_signal *sw, int revents)
782 {
783 int pid, status;
784
785 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
786 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
787 if (!WCONTINUED
788 || errno != EINVAL
789 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
790 return;
791
792 /* make sure we are called again until all childs have been reaped */
793 /* we need to do it this way so that the callback gets called before we continue */
794 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
795
796 child_reap (EV_A_ sw, pid, pid, status);
797 if (EV_PID_HASHSIZE > 1)
798 child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
799 }
800
801 #endif
802
803 /*****************************************************************************/
804
805 #if EV_USE_PORT
806 # include "ev_port.c"
807 #endif
808 #if EV_USE_KQUEUE
809 # include "ev_kqueue.c"
810 #endif
811 #if EV_USE_EPOLL
812 # include "ev_epoll.c"
813 #endif
814 #if EV_USE_POLL
815 # include "ev_poll.c"
816 #endif
817 #if EV_USE_SELECT
818 # include "ev_select.c"
819 #endif
820
821 int
822 ev_version_major (void)
823 {
824 return EV_VERSION_MAJOR;
825 }
826
827 int
828 ev_version_minor (void)
829 {
830 return EV_VERSION_MINOR;
831 }
832
833 /* return true if we are running with elevated privileges and should ignore env variables */
834 int inline_size
835 enable_secure (void)
836 {
837 #ifdef _WIN32
838 return 0;
839 #else
840 return getuid () != geteuid ()
841 || getgid () != getegid ();
842 #endif
843 }
844
845 unsigned int
846 ev_supported_backends (void)
847 {
848 unsigned int flags = 0;
849
850 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
851 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
852 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
853 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
854 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
855
856 return flags;
857 }
858
859 unsigned int
860 ev_recommended_backends (void)
861 {
862 unsigned int flags = ev_supported_backends ();
863
864 #ifndef __NetBSD__
865 /* kqueue is borked on everything but netbsd apparently */
866 /* it usually doesn't work correctly on anything but sockets and pipes */
867 flags &= ~EVBACKEND_KQUEUE;
868 #endif
869 #ifdef __APPLE__
870 // flags &= ~EVBACKEND_KQUEUE; for documentation
871 flags &= ~EVBACKEND_POLL;
872 #endif
873
874 return flags;
875 }
876
877 unsigned int
878 ev_embeddable_backends (void)
879 {
880 return EVBACKEND_EPOLL
881 | EVBACKEND_KQUEUE
882 | EVBACKEND_PORT;
883 }
884
885 unsigned int
886 ev_backend (EV_P)
887 {
888 return backend;
889 }
890
891 static void noinline
892 loop_init (EV_P_ unsigned int flags)
893 {
894 if (!backend)
895 {
896 #if EV_USE_MONOTONIC
897 {
898 struct timespec ts;
899 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
900 have_monotonic = 1;
901 }
902 #endif
903
904 ev_rt_now = ev_time ();
905 mn_now = get_clock ();
906 now_floor = mn_now;
907 rtmn_diff = ev_rt_now - mn_now;
908
909 /* pid check not overridable via env */
910 #ifndef _WIN32
911 if (flags & EVFLAG_FORKCHECK)
912 curpid = getpid ();
913 #endif
914
915 if (!(flags & EVFLAG_NOENV)
916 && !enable_secure ()
917 && getenv ("LIBEV_FLAGS"))
918 flags = atoi (getenv ("LIBEV_FLAGS"));
919
920 if (!(flags & 0x0000ffffUL))
921 flags |= ev_recommended_backends ();
922
923 backend = 0;
924 backend_fd = -1;
925 #if EV_USE_INOTIFY
926 fs_fd = -2;
927 #endif
928
929 #if EV_USE_PORT
930 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
931 #endif
932 #if EV_USE_KQUEUE
933 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
934 #endif
935 #if EV_USE_EPOLL
936 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
937 #endif
938 #if EV_USE_POLL
939 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
940 #endif
941 #if EV_USE_SELECT
942 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
943 #endif
944
945 ev_init (&sigev, sigcb);
946 ev_set_priority (&sigev, EV_MAXPRI);
947 }
948 }
949
950 static void noinline
951 loop_destroy (EV_P)
952 {
953 int i;
954
955 #if EV_USE_INOTIFY
956 if (fs_fd >= 0)
957 close (fs_fd);
958 #endif
959
960 if (backend_fd >= 0)
961 close (backend_fd);
962
963 #if EV_USE_PORT
964 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
965 #endif
966 #if EV_USE_KQUEUE
967 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
968 #endif
969 #if EV_USE_EPOLL
970 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
971 #endif
972 #if EV_USE_POLL
973 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
974 #endif
975 #if EV_USE_SELECT
976 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
977 #endif
978
979 for (i = NUMPRI; i--; )
980 array_free (pending, [i]);
981
982 /* have to use the microsoft-never-gets-it-right macro */
983 array_free (fdchange, EMPTY0);
984 array_free (timer, EMPTY0);
985 #if EV_PERIODIC_ENABLE
986 array_free (periodic, EMPTY0);
987 #endif
988 array_free (idle, EMPTY0);
989 array_free (prepare, EMPTY0);
990 array_free (check, EMPTY0);
991
992 backend = 0;
993 }
994
995 void inline_size infy_fork (EV_P);
996
997 void inline_size
998 loop_fork (EV_P)
999 {
1000 #if EV_USE_PORT
1001 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1002 #endif
1003 #if EV_USE_KQUEUE
1004 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1005 #endif
1006 #if EV_USE_EPOLL
1007 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1008 #endif
1009 #if EV_USE_INOTIFY
1010 infy_fork (EV_A);
1011 #endif
1012
1013 if (ev_is_active (&sigev))
1014 {
1015 /* default loop */
1016
1017 ev_ref (EV_A);
1018 ev_io_stop (EV_A_ &sigev);
1019 close (sigpipe [0]);
1020 close (sigpipe [1]);
1021
1022 while (pipe (sigpipe))
1023 syserr ("(libev) error creating pipe");
1024
1025 siginit (EV_A);
1026 }
1027
1028 postfork = 0;
1029 }
1030
1031 #if EV_MULTIPLICITY
1032 struct ev_loop *
1033 ev_loop_new (unsigned int flags)
1034 {
1035 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1036
1037 memset (loop, 0, sizeof (struct ev_loop));
1038
1039 loop_init (EV_A_ flags);
1040
1041 if (ev_backend (EV_A))
1042 return loop;
1043
1044 return 0;
1045 }
1046
1047 void
1048 ev_loop_destroy (EV_P)
1049 {
1050 loop_destroy (EV_A);
1051 ev_free (loop);
1052 }
1053
1054 void
1055 ev_loop_fork (EV_P)
1056 {
1057 postfork = 1;
1058 }
1059
1060 #endif
1061
1062 #if EV_MULTIPLICITY
1063 struct ev_loop *
1064 ev_default_loop_init (unsigned int flags)
1065 #else
1066 int
1067 ev_default_loop (unsigned int flags)
1068 #endif
1069 {
1070 if (sigpipe [0] == sigpipe [1])
1071 if (pipe (sigpipe))
1072 return 0;
1073
1074 if (!ev_default_loop_ptr)
1075 {
1076 #if EV_MULTIPLICITY
1077 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1078 #else
1079 ev_default_loop_ptr = 1;
1080 #endif
1081
1082 loop_init (EV_A_ flags);
1083
1084 if (ev_backend (EV_A))
1085 {
1086 siginit (EV_A);
1087
1088 #ifndef _WIN32
1089 ev_signal_init (&childev, childcb, SIGCHLD);
1090 ev_set_priority (&childev, EV_MAXPRI);
1091 ev_signal_start (EV_A_ &childev);
1092 ev_unref (EV_A); /* child watcher should not keep loop alive */
1093 #endif
1094 }
1095 else
1096 ev_default_loop_ptr = 0;
1097 }
1098
1099 return ev_default_loop_ptr;
1100 }
1101
1102 void
1103 ev_default_destroy (void)
1104 {
1105 #if EV_MULTIPLICITY
1106 struct ev_loop *loop = ev_default_loop_ptr;
1107 #endif
1108
1109 #ifndef _WIN32
1110 ev_ref (EV_A); /* child watcher */
1111 ev_signal_stop (EV_A_ &childev);
1112 #endif
1113
1114 ev_ref (EV_A); /* signal watcher */
1115 ev_io_stop (EV_A_ &sigev);
1116
1117 close (sigpipe [0]); sigpipe [0] = 0;
1118 close (sigpipe [1]); sigpipe [1] = 0;
1119
1120 loop_destroy (EV_A);
1121 }
1122
1123 void
1124 ev_default_fork (void)
1125 {
1126 #if EV_MULTIPLICITY
1127 struct ev_loop *loop = ev_default_loop_ptr;
1128 #endif
1129
1130 if (backend)
1131 postfork = 1;
1132 }
1133
1134 /*****************************************************************************/
1135
1136 int inline_size
1137 any_pending (EV_P)
1138 {
1139 int pri;
1140
1141 for (pri = NUMPRI; pri--; )
1142 if (pendingcnt [pri])
1143 return 1;
1144
1145 return 0;
1146 }
1147
1148 void inline_speed
1149 call_pending (EV_P)
1150 {
1151 int pri;
1152
1153 for (pri = NUMPRI; pri--; )
1154 while (pendingcnt [pri])
1155 {
1156 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1157
1158 if (expect_true (p->w))
1159 {
1160 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1161
1162 p->w->pending = 0;
1163 EV_CB_INVOKE (p->w, p->events);
1164 }
1165 }
1166 }
1167
1168 void inline_size
1169 timers_reify (EV_P)
1170 {
1171 while (timercnt && ((WT)timers [0])->at <= mn_now)
1172 {
1173 ev_timer *w = timers [0];
1174
1175 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1176
1177 /* first reschedule or stop timer */
1178 if (w->repeat)
1179 {
1180 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1181
1182 ((WT)w)->at += w->repeat;
1183 if (((WT)w)->at < mn_now)
1184 ((WT)w)->at = mn_now;
1185
1186 downheap ((WT *)timers, timercnt, 0);
1187 }
1188 else
1189 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1190
1191 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1192 }
1193 }
1194
1195 #if EV_PERIODIC_ENABLE
1196 void inline_size
1197 periodics_reify (EV_P)
1198 {
1199 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1200 {
1201 ev_periodic *w = periodics [0];
1202
1203 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1204
1205 /* first reschedule or stop timer */
1206 if (w->reschedule_cb)
1207 {
1208 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1209 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1210 downheap ((WT *)periodics, periodiccnt, 0);
1211 }
1212 else if (w->interval)
1213 {
1214 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1215 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1216 downheap ((WT *)periodics, periodiccnt, 0);
1217 }
1218 else
1219 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1220
1221 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1222 }
1223 }
1224
1225 static void noinline
1226 periodics_reschedule (EV_P)
1227 {
1228 int i;
1229
1230 /* adjust periodics after time jump */
1231 for (i = 0; i < periodiccnt; ++i)
1232 {
1233 ev_periodic *w = periodics [i];
1234
1235 if (w->reschedule_cb)
1236 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1237 else if (w->interval)
1238 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1239 }
1240
1241 /* now rebuild the heap */
1242 for (i = periodiccnt >> 1; i--; )
1243 downheap ((WT *)periodics, periodiccnt, i);
1244 }
1245 #endif
1246
1247 int inline_size
1248 time_update_monotonic (EV_P)
1249 {
1250 mn_now = get_clock ();
1251
1252 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1253 {
1254 ev_rt_now = rtmn_diff + mn_now;
1255 return 0;
1256 }
1257 else
1258 {
1259 now_floor = mn_now;
1260 ev_rt_now = ev_time ();
1261 return 1;
1262 }
1263 }
1264
1265 void inline_size
1266 time_update (EV_P)
1267 {
1268 int i;
1269
1270 #if EV_USE_MONOTONIC
1271 if (expect_true (have_monotonic))
1272 {
1273 if (time_update_monotonic (EV_A))
1274 {
1275 ev_tstamp odiff = rtmn_diff;
1276
1277 /* loop a few times, before making important decisions.
1278 * on the choice of "4": one iteration isn't enough,
1279 * in case we get preempted during the calls to
1280 * ev_time and get_clock. a second call is almost guaranteed
1281 * to succeed in that case, though. and looping a few more times
1282 * doesn't hurt either as we only do this on time-jumps or
1283 * in the unlikely event of having been preempted here.
1284 */
1285 for (i = 4; --i; )
1286 {
1287 rtmn_diff = ev_rt_now - mn_now;
1288
1289 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1290 return; /* all is well */
1291
1292 ev_rt_now = ev_time ();
1293 mn_now = get_clock ();
1294 now_floor = mn_now;
1295 }
1296
1297 # if EV_PERIODIC_ENABLE
1298 periodics_reschedule (EV_A);
1299 # endif
1300 /* no timer adjustment, as the monotonic clock doesn't jump */
1301 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1302 }
1303 }
1304 else
1305 #endif
1306 {
1307 ev_rt_now = ev_time ();
1308
1309 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1310 {
1311 #if EV_PERIODIC_ENABLE
1312 periodics_reschedule (EV_A);
1313 #endif
1314
1315 /* adjust timers. this is easy, as the offset is the same for all of them */
1316 for (i = 0; i < timercnt; ++i)
1317 ((WT)timers [i])->at += ev_rt_now - mn_now;
1318 }
1319
1320 mn_now = ev_rt_now;
1321 }
1322 }
1323
1324 void
1325 ev_ref (EV_P)
1326 {
1327 ++activecnt;
1328 }
1329
1330 void
1331 ev_unref (EV_P)
1332 {
1333 --activecnt;
1334 }
1335
1336 static int loop_done;
1337
1338 void
1339 ev_loop (EV_P_ int flags)
1340 {
1341 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1342 ? EVUNLOOP_ONE
1343 : EVUNLOOP_CANCEL;
1344
1345 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1346
1347 do
1348 {
1349 #ifndef _WIN32
1350 if (expect_false (curpid)) /* penalise the forking check even more */
1351 if (expect_false (getpid () != curpid))
1352 {
1353 curpid = getpid ();
1354 postfork = 1;
1355 }
1356 #endif
1357
1358 #if EV_FORK_ENABLE
1359 /* we might have forked, so queue fork handlers */
1360 if (expect_false (postfork))
1361 if (forkcnt)
1362 {
1363 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1364 call_pending (EV_A);
1365 }
1366 #endif
1367
1368 /* queue check watchers (and execute them) */
1369 if (expect_false (preparecnt))
1370 {
1371 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1372 call_pending (EV_A);
1373 }
1374
1375 if (expect_false (!activecnt))
1376 break;
1377
1378 /* we might have forked, so reify kernel state if necessary */
1379 if (expect_false (postfork))
1380 loop_fork (EV_A);
1381
1382 /* update fd-related kernel structures */
1383 fd_reify (EV_A);
1384
1385 /* calculate blocking time */
1386 {
1387 ev_tstamp block;
1388
1389 if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
1390 block = 0.; /* do not block at all */
1391 else
1392 {
1393 /* update time to cancel out callback processing overhead */
1394 #if EV_USE_MONOTONIC
1395 if (expect_true (have_monotonic))
1396 time_update_monotonic (EV_A);
1397 else
1398 #endif
1399 {
1400 ev_rt_now = ev_time ();
1401 mn_now = ev_rt_now;
1402 }
1403
1404 block = MAX_BLOCKTIME;
1405
1406 if (timercnt)
1407 {
1408 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1409 if (block > to) block = to;
1410 }
1411
1412 #if EV_PERIODIC_ENABLE
1413 if (periodiccnt)
1414 {
1415 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1416 if (block > to) block = to;
1417 }
1418 #endif
1419
1420 if (expect_false (block < 0.)) block = 0.;
1421 }
1422
1423 backend_poll (EV_A_ block);
1424 }
1425
1426 /* update ev_rt_now, do magic */
1427 time_update (EV_A);
1428
1429 /* queue pending timers and reschedule them */
1430 timers_reify (EV_A); /* relative timers called last */
1431 #if EV_PERIODIC_ENABLE
1432 periodics_reify (EV_A); /* absolute timers called first */
1433 #endif
1434
1435 /* queue idle watchers unless other events are pending */
1436 if (idlecnt && !any_pending (EV_A))
1437 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1438
1439 /* queue check watchers, to be executed first */
1440 if (expect_false (checkcnt))
1441 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1442
1443 call_pending (EV_A);
1444
1445 }
1446 while (expect_true (activecnt && !loop_done));
1447
1448 if (loop_done == EVUNLOOP_ONE)
1449 loop_done = EVUNLOOP_CANCEL;
1450 }
1451
1452 void
1453 ev_unloop (EV_P_ int how)
1454 {
1455 loop_done = how;
1456 }
1457
1458 /*****************************************************************************/
1459
1460 void inline_size
1461 wlist_add (WL *head, WL elem)
1462 {
1463 elem->next = *head;
1464 *head = elem;
1465 }
1466
1467 void inline_size
1468 wlist_del (WL *head, WL elem)
1469 {
1470 while (*head)
1471 {
1472 if (*head == elem)
1473 {
1474 *head = elem->next;
1475 return;
1476 }
1477
1478 head = &(*head)->next;
1479 }
1480 }
1481
1482 void inline_speed
1483 ev_clear_pending (EV_P_ W w)
1484 {
1485 if (w->pending)
1486 {
1487 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1488 w->pending = 0;
1489 }
1490 }
1491
1492 void inline_speed
1493 ev_start (EV_P_ W w, int active)
1494 {
1495 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1496 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1497
1498 w->active = active;
1499 ev_ref (EV_A);
1500 }
1501
1502 void inline_size
1503 ev_stop (EV_P_ W w)
1504 {
1505 ev_unref (EV_A);
1506 w->active = 0;
1507 }
1508
1509 /*****************************************************************************/
1510
1511 void
1512 ev_io_start (EV_P_ ev_io *w)
1513 {
1514 int fd = w->fd;
1515
1516 if (expect_false (ev_is_active (w)))
1517 return;
1518
1519 assert (("ev_io_start called with negative fd", fd >= 0));
1520
1521 ev_start (EV_A_ (W)w, 1);
1522 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1523 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1524
1525 fd_change (EV_A_ fd);
1526 }
1527
1528 void
1529 ev_io_stop (EV_P_ ev_io *w)
1530 {
1531 ev_clear_pending (EV_A_ (W)w);
1532 if (expect_false (!ev_is_active (w)))
1533 return;
1534
1535 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1536
1537 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1538 ev_stop (EV_A_ (W)w);
1539
1540 fd_change (EV_A_ w->fd);
1541 }
1542
1543 void
1544 ev_timer_start (EV_P_ ev_timer *w)
1545 {
1546 if (expect_false (ev_is_active (w)))
1547 return;
1548
1549 ((WT)w)->at += mn_now;
1550
1551 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1552
1553 ev_start (EV_A_ (W)w, ++timercnt);
1554 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1555 timers [timercnt - 1] = w;
1556 upheap ((WT *)timers, timercnt - 1);
1557
1558 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1559 }
1560
1561 void
1562 ev_timer_stop (EV_P_ ev_timer *w)
1563 {
1564 ev_clear_pending (EV_A_ (W)w);
1565 if (expect_false (!ev_is_active (w)))
1566 return;
1567
1568 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1569
1570 {
1571 int active = ((W)w)->active;
1572
1573 if (expect_true (--active < --timercnt))
1574 {
1575 timers [active] = timers [timercnt];
1576 adjustheap ((WT *)timers, timercnt, active);
1577 }
1578 }
1579
1580 ((WT)w)->at -= mn_now;
1581
1582 ev_stop (EV_A_ (W)w);
1583 }
1584
1585 void
1586 ev_timer_again (EV_P_ ev_timer *w)
1587 {
1588 if (ev_is_active (w))
1589 {
1590 if (w->repeat)
1591 {
1592 ((WT)w)->at = mn_now + w->repeat;
1593 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1594 }
1595 else
1596 ev_timer_stop (EV_A_ w);
1597 }
1598 else if (w->repeat)
1599 {
1600 w->at = w->repeat;
1601 ev_timer_start (EV_A_ w);
1602 }
1603 }
1604
1605 #if EV_PERIODIC_ENABLE
1606 void
1607 ev_periodic_start (EV_P_ ev_periodic *w)
1608 {
1609 if (expect_false (ev_is_active (w)))
1610 return;
1611
1612 if (w->reschedule_cb)
1613 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1614 else if (w->interval)
1615 {
1616 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1617 /* this formula differs from the one in periodic_reify because we do not always round up */
1618 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1619 }
1620
1621 ev_start (EV_A_ (W)w, ++periodiccnt);
1622 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1623 periodics [periodiccnt - 1] = w;
1624 upheap ((WT *)periodics, periodiccnt - 1);
1625
1626 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1627 }
1628
1629 void
1630 ev_periodic_stop (EV_P_ ev_periodic *w)
1631 {
1632 ev_clear_pending (EV_A_ (W)w);
1633 if (expect_false (!ev_is_active (w)))
1634 return;
1635
1636 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1637
1638 {
1639 int active = ((W)w)->active;
1640
1641 if (expect_true (--active < --periodiccnt))
1642 {
1643 periodics [active] = periodics [periodiccnt];
1644 adjustheap ((WT *)periodics, periodiccnt, active);
1645 }
1646 }
1647
1648 ev_stop (EV_A_ (W)w);
1649 }
1650
1651 void
1652 ev_periodic_again (EV_P_ ev_periodic *w)
1653 {
1654 /* TODO: use adjustheap and recalculation */
1655 ev_periodic_stop (EV_A_ w);
1656 ev_periodic_start (EV_A_ w);
1657 }
1658 #endif
1659
1660 #ifndef SA_RESTART
1661 # define SA_RESTART 0
1662 #endif
1663
1664 void
1665 ev_signal_start (EV_P_ ev_signal *w)
1666 {
1667 #if EV_MULTIPLICITY
1668 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1669 #endif
1670 if (expect_false (ev_is_active (w)))
1671 return;
1672
1673 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1674
1675 ev_start (EV_A_ (W)w, 1);
1676 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1677 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1678
1679 if (!((WL)w)->next)
1680 {
1681 #if _WIN32
1682 signal (w->signum, sighandler);
1683 #else
1684 struct sigaction sa;
1685 sa.sa_handler = sighandler;
1686 sigfillset (&sa.sa_mask);
1687 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1688 sigaction (w->signum, &sa, 0);
1689 #endif
1690 }
1691 }
1692
1693 void
1694 ev_signal_stop (EV_P_ ev_signal *w)
1695 {
1696 ev_clear_pending (EV_A_ (W)w);
1697 if (expect_false (!ev_is_active (w)))
1698 return;
1699
1700 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1701 ev_stop (EV_A_ (W)w);
1702
1703 if (!signals [w->signum - 1].head)
1704 signal (w->signum, SIG_DFL);
1705 }
1706
1707 void
1708 ev_child_start (EV_P_ ev_child *w)
1709 {
1710 #if EV_MULTIPLICITY
1711 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1712 #endif
1713 if (expect_false (ev_is_active (w)))
1714 return;
1715
1716 ev_start (EV_A_ (W)w, 1);
1717 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1718 }
1719
1720 void
1721 ev_child_stop (EV_P_ ev_child *w)
1722 {
1723 ev_clear_pending (EV_A_ (W)w);
1724 if (expect_false (!ev_is_active (w)))
1725 return;
1726
1727 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1728 ev_stop (EV_A_ (W)w);
1729 }
1730
1731 #if EV_STAT_ENABLE
1732
1733 # ifdef _WIN32
1734 # undef lstat
1735 # define lstat(a,b) _stati64 (a,b)
1736 # endif
1737
1738 #define DEF_STAT_INTERVAL 5.0074891
1739 #define MIN_STAT_INTERVAL 0.1074891
1740
1741 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1742
1743 #if EV_USE_INOTIFY
1744 # define EV_INOTIFY_BUFSIZE 8192
1745
1746 static void noinline
1747 infy_add (EV_P_ ev_stat *w)
1748 {
1749 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);
1750
1751 if (w->wd < 0)
1752 {
1753 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1754
1755 /* monitor some parent directory for speedup hints */
1756 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1757 {
1758 char path [4096];
1759 strcpy (path, w->path);
1760
1761 do
1762 {
1763 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1764 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1765
1766 char *pend = strrchr (path, '/');
1767
1768 if (!pend)
1769 break; /* whoops, no '/', complain to your admin */
1770
1771 *pend = 0;
1772 w->wd = inotify_add_watch (fs_fd, path, mask);
1773 }
1774 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1775 }
1776 }
1777 else
1778 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1779
1780 if (w->wd >= 0)
1781 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1782 }
1783
1784 static void noinline
1785 infy_del (EV_P_ ev_stat *w)
1786 {
1787 int slot;
1788 int wd = w->wd;
1789
1790 if (wd < 0)
1791 return;
1792
1793 w->wd = -2;
1794 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1795 wlist_del (&fs_hash [slot].head, (WL)w);
1796
1797 /* remove this watcher, if others are watching it, they will rearm */
1798 inotify_rm_watch (fs_fd, wd);
1799 }
1800
1801 static void noinline
1802 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1803 {
1804 if (slot < 0)
1805 /* overflow, need to check for all hahs slots */
1806 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1807 infy_wd (EV_A_ slot, wd, ev);
1808 else
1809 {
1810 WL w_;
1811
1812 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1813 {
1814 ev_stat *w = (ev_stat *)w_;
1815 w_ = w_->next; /* lets us remove this watcher and all before it */
1816
1817 if (w->wd == wd || wd == -1)
1818 {
1819 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1820 {
1821 w->wd = -1;
1822 infy_add (EV_A_ w); /* re-add, no matter what */
1823 }
1824
1825 stat_timer_cb (EV_A_ &w->timer, 0);
1826 }
1827 }
1828 }
1829 }
1830
1831 static void
1832 infy_cb (EV_P_ ev_io *w, int revents)
1833 {
1834 char buf [EV_INOTIFY_BUFSIZE];
1835 struct inotify_event *ev = (struct inotify_event *)buf;
1836 int ofs;
1837 int len = read (fs_fd, buf, sizeof (buf));
1838
1839 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1840 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1841 }
1842
1843 void inline_size
1844 infy_init (EV_P)
1845 {
1846 if (fs_fd != -2)
1847 return;
1848
1849 fs_fd = inotify_init ();
1850
1851 if (fs_fd >= 0)
1852 {
1853 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1854 ev_set_priority (&fs_w, EV_MAXPRI);
1855 ev_io_start (EV_A_ &fs_w);
1856 }
1857 }
1858
1859 void inline_size
1860 infy_fork (EV_P)
1861 {
1862 int slot;
1863
1864 if (fs_fd < 0)
1865 return;
1866
1867 close (fs_fd);
1868 fs_fd = inotify_init ();
1869
1870 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1871 {
1872 WL w_ = fs_hash [slot].head;
1873 fs_hash [slot].head = 0;
1874
1875 while (w_)
1876 {
1877 ev_stat *w = (ev_stat *)w_;
1878 w_ = w_->next; /* lets us add this watcher */
1879
1880 w->wd = -1;
1881
1882 if (fs_fd >= 0)
1883 infy_add (EV_A_ w); /* re-add, no matter what */
1884 else
1885 ev_timer_start (EV_A_ &w->timer);
1886 }
1887
1888 }
1889 }
1890
1891 #endif
1892
1893 void
1894 ev_stat_stat (EV_P_ ev_stat *w)
1895 {
1896 if (lstat (w->path, &w->attr) < 0)
1897 w->attr.st_nlink = 0;
1898 else if (!w->attr.st_nlink)
1899 w->attr.st_nlink = 1;
1900 }
1901
1902 static void noinline
1903 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1904 {
1905 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1906
1907 /* we copy this here each the time so that */
1908 /* prev has the old value when the callback gets invoked */
1909 w->prev = w->attr;
1910 ev_stat_stat (EV_A_ w);
1911
1912 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
1913 if (
1914 w->prev.st_dev != w->attr.st_dev
1915 || w->prev.st_ino != w->attr.st_ino
1916 || w->prev.st_mode != w->attr.st_mode
1917 || w->prev.st_nlink != w->attr.st_nlink
1918 || w->prev.st_uid != w->attr.st_uid
1919 || w->prev.st_gid != w->attr.st_gid
1920 || w->prev.st_rdev != w->attr.st_rdev
1921 || w->prev.st_size != w->attr.st_size
1922 || w->prev.st_atime != w->attr.st_atime
1923 || w->prev.st_mtime != w->attr.st_mtime
1924 || w->prev.st_ctime != w->attr.st_ctime
1925 ) {
1926 #if EV_USE_INOTIFY
1927 infy_del (EV_A_ w);
1928 infy_add (EV_A_ w);
1929 ev_stat_stat (EV_A_ w); /* avoid race... */
1930 #endif
1931
1932 ev_feed_event (EV_A_ w, EV_STAT);
1933 }
1934 }
1935
1936 void
1937 ev_stat_start (EV_P_ ev_stat *w)
1938 {
1939 if (expect_false (ev_is_active (w)))
1940 return;
1941
1942 /* since we use memcmp, we need to clear any padding data etc. */
1943 memset (&w->prev, 0, sizeof (ev_statdata));
1944 memset (&w->attr, 0, sizeof (ev_statdata));
1945
1946 ev_stat_stat (EV_A_ w);
1947
1948 if (w->interval < MIN_STAT_INTERVAL)
1949 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
1950
1951 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
1952 ev_set_priority (&w->timer, ev_priority (w));
1953
1954 #if EV_USE_INOTIFY
1955 infy_init (EV_A);
1956
1957 if (fs_fd >= 0)
1958 infy_add (EV_A_ w);
1959 else
1960 #endif
1961 ev_timer_start (EV_A_ &w->timer);
1962
1963 ev_start (EV_A_ (W)w, 1);
1964 }
1965
1966 void
1967 ev_stat_stop (EV_P_ ev_stat *w)
1968 {
1969 ev_clear_pending (EV_A_ (W)w);
1970 if (expect_false (!ev_is_active (w)))
1971 return;
1972
1973 #if EV_USE_INOTIFY
1974 infy_del (EV_A_ w);
1975 #endif
1976 ev_timer_stop (EV_A_ &w->timer);
1977
1978 ev_stop (EV_A_ (W)w);
1979 }
1980 #endif
1981
1982 void
1983 ev_idle_start (EV_P_ ev_idle *w)
1984 {
1985 if (expect_false (ev_is_active (w)))
1986 return;
1987
1988 ev_start (EV_A_ (W)w, ++idlecnt);
1989 array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1990 idles [idlecnt - 1] = w;
1991 }
1992
1993 void
1994 ev_idle_stop (EV_P_ ev_idle *w)
1995 {
1996 ev_clear_pending (EV_A_ (W)w);
1997 if (expect_false (!ev_is_active (w)))
1998 return;
1999
2000 {
2001 int active = ((W)w)->active;
2002 idles [active - 1] = idles [--idlecnt];
2003 ((W)idles [active - 1])->active = active;
2004 }
2005
2006 ev_stop (EV_A_ (W)w);
2007 }
2008
2009 void
2010 ev_prepare_start (EV_P_ ev_prepare *w)
2011 {
2012 if (expect_false (ev_is_active (w)))
2013 return;
2014
2015 ev_start (EV_A_ (W)w, ++preparecnt);
2016 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2017 prepares [preparecnt - 1] = w;
2018 }
2019
2020 void
2021 ev_prepare_stop (EV_P_ ev_prepare *w)
2022 {
2023 ev_clear_pending (EV_A_ (W)w);
2024 if (expect_false (!ev_is_active (w)))
2025 return;
2026
2027 {
2028 int active = ((W)w)->active;
2029 prepares [active - 1] = prepares [--preparecnt];
2030 ((W)prepares [active - 1])->active = active;
2031 }
2032
2033 ev_stop (EV_A_ (W)w);
2034 }
2035
2036 void
2037 ev_check_start (EV_P_ ev_check *w)
2038 {
2039 if (expect_false (ev_is_active (w)))
2040 return;
2041
2042 ev_start (EV_A_ (W)w, ++checkcnt);
2043 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2044 checks [checkcnt - 1] = w;
2045 }
2046
2047 void
2048 ev_check_stop (EV_P_ ev_check *w)
2049 {
2050 ev_clear_pending (EV_A_ (W)w);
2051 if (expect_false (!ev_is_active (w)))
2052 return;
2053
2054 {
2055 int active = ((W)w)->active;
2056 checks [active - 1] = checks [--checkcnt];
2057 ((W)checks [active - 1])->active = active;
2058 }
2059
2060 ev_stop (EV_A_ (W)w);
2061 }
2062
2063 #if EV_EMBED_ENABLE
2064 void noinline
2065 ev_embed_sweep (EV_P_ ev_embed *w)
2066 {
2067 ev_loop (w->loop, EVLOOP_NONBLOCK);
2068 }
2069
2070 static void
2071 embed_cb (EV_P_ ev_io *io, int revents)
2072 {
2073 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2074
2075 if (ev_cb (w))
2076 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2077 else
2078 ev_embed_sweep (loop, w);
2079 }
2080
2081 void
2082 ev_embed_start (EV_P_ ev_embed *w)
2083 {
2084 if (expect_false (ev_is_active (w)))
2085 return;
2086
2087 {
2088 struct ev_loop *loop = w->loop;
2089 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2090 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2091 }
2092
2093 ev_set_priority (&w->io, ev_priority (w));
2094 ev_io_start (EV_A_ &w->io);
2095
2096 ev_start (EV_A_ (W)w, 1);
2097 }
2098
2099 void
2100 ev_embed_stop (EV_P_ ev_embed *w)
2101 {
2102 ev_clear_pending (EV_A_ (W)w);
2103 if (expect_false (!ev_is_active (w)))
2104 return;
2105
2106 ev_io_stop (EV_A_ &w->io);
2107
2108 ev_stop (EV_A_ (W)w);
2109 }
2110 #endif
2111
2112 #if EV_FORK_ENABLE
2113 void
2114 ev_fork_start (EV_P_ ev_fork *w)
2115 {
2116 if (expect_false (ev_is_active (w)))
2117 return;
2118
2119 ev_start (EV_A_ (W)w, ++forkcnt);
2120 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2121 forks [forkcnt - 1] = w;
2122 }
2123
2124 void
2125 ev_fork_stop (EV_P_ ev_fork *w)
2126 {
2127 ev_clear_pending (EV_A_ (W)w);
2128 if (expect_false (!ev_is_active (w)))
2129 return;
2130
2131 {
2132 int active = ((W)w)->active;
2133 forks [active - 1] = forks [--forkcnt];
2134 ((W)forks [active - 1])->active = active;
2135 }
2136
2137 ev_stop (EV_A_ (W)w);
2138 }
2139 #endif
2140
2141 /*****************************************************************************/
2142
2143 struct ev_once
2144 {
2145 ev_io io;
2146 ev_timer to;
2147 void (*cb)(int revents, void *arg);
2148 void *arg;
2149 };
2150
2151 static void
2152 once_cb (EV_P_ struct ev_once *once, int revents)
2153 {
2154 void (*cb)(int revents, void *arg) = once->cb;
2155 void *arg = once->arg;
2156
2157 ev_io_stop (EV_A_ &once->io);
2158 ev_timer_stop (EV_A_ &once->to);
2159 ev_free (once);
2160
2161 cb (revents, arg);
2162 }
2163
2164 static void
2165 once_cb_io (EV_P_ ev_io *w, int revents)
2166 {
2167 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2168 }
2169
2170 static void
2171 once_cb_to (EV_P_ ev_timer *w, int revents)
2172 {
2173 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2174 }
2175
2176 void
2177 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2178 {
2179 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2180
2181 if (expect_false (!once))
2182 {
2183 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2184 return;
2185 }
2186
2187 once->cb = cb;
2188 once->arg = arg;
2189
2190 ev_init (&once->io, once_cb_io);
2191 if (fd >= 0)
2192 {
2193 ev_io_set (&once->io, fd, events);
2194 ev_io_start (EV_A_ &once->io);
2195 }
2196
2197 ev_init (&once->to, once_cb_to);
2198 if (timeout >= 0.)
2199 {
2200 ev_timer_set (&once->to, timeout, 0.);
2201 ev_timer_start (EV_A_ &once->to);
2202 }
2203 }
2204
2205 #ifdef __cplusplus
2206 }
2207 #endif
2208