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Revision: 1.162
Committed: Mon Dec 3 13:41:24 2007 UTC (16 years, 7 months ago) by root
Content type: text/plain
Branch: MAIN
Changes since 1.161: +7 -0 lines
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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 unsigned int
892 ev_loop_count (EV_P)
893 {
894 return loop_count;
895 }
896
897 static void noinline
898 loop_init (EV_P_ unsigned int flags)
899 {
900 if (!backend)
901 {
902 #if EV_USE_MONOTONIC
903 {
904 struct timespec ts;
905 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
906 have_monotonic = 1;
907 }
908 #endif
909
910 ev_rt_now = ev_time ();
911 mn_now = get_clock ();
912 now_floor = mn_now;
913 rtmn_diff = ev_rt_now - mn_now;
914
915 /* pid check not overridable via env */
916 #ifndef _WIN32
917 if (flags & EVFLAG_FORKCHECK)
918 curpid = getpid ();
919 #endif
920
921 if (!(flags & EVFLAG_NOENV)
922 && !enable_secure ()
923 && getenv ("LIBEV_FLAGS"))
924 flags = atoi (getenv ("LIBEV_FLAGS"));
925
926 if (!(flags & 0x0000ffffUL))
927 flags |= ev_recommended_backends ();
928
929 backend = 0;
930 backend_fd = -1;
931 #if EV_USE_INOTIFY
932 fs_fd = -2;
933 #endif
934
935 #if EV_USE_PORT
936 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
937 #endif
938 #if EV_USE_KQUEUE
939 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
940 #endif
941 #if EV_USE_EPOLL
942 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
943 #endif
944 #if EV_USE_POLL
945 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
946 #endif
947 #if EV_USE_SELECT
948 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
949 #endif
950
951 ev_init (&sigev, sigcb);
952 ev_set_priority (&sigev, EV_MAXPRI);
953 }
954 }
955
956 static void noinline
957 loop_destroy (EV_P)
958 {
959 int i;
960
961 #if EV_USE_INOTIFY
962 if (fs_fd >= 0)
963 close (fs_fd);
964 #endif
965
966 if (backend_fd >= 0)
967 close (backend_fd);
968
969 #if EV_USE_PORT
970 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
971 #endif
972 #if EV_USE_KQUEUE
973 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
974 #endif
975 #if EV_USE_EPOLL
976 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
977 #endif
978 #if EV_USE_POLL
979 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
980 #endif
981 #if EV_USE_SELECT
982 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
983 #endif
984
985 for (i = NUMPRI; i--; )
986 array_free (pending, [i]);
987
988 /* have to use the microsoft-never-gets-it-right macro */
989 array_free (fdchange, EMPTY0);
990 array_free (timer, EMPTY0);
991 #if EV_PERIODIC_ENABLE
992 array_free (periodic, EMPTY0);
993 #endif
994 array_free (idle, EMPTY0);
995 array_free (prepare, EMPTY0);
996 array_free (check, EMPTY0);
997
998 backend = 0;
999 }
1000
1001 void inline_size infy_fork (EV_P);
1002
1003 void inline_size
1004 loop_fork (EV_P)
1005 {
1006 #if EV_USE_PORT
1007 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
1008 #endif
1009 #if EV_USE_KQUEUE
1010 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
1011 #endif
1012 #if EV_USE_EPOLL
1013 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
1014 #endif
1015 #if EV_USE_INOTIFY
1016 infy_fork (EV_A);
1017 #endif
1018
1019 if (ev_is_active (&sigev))
1020 {
1021 /* default loop */
1022
1023 ev_ref (EV_A);
1024 ev_io_stop (EV_A_ &sigev);
1025 close (sigpipe [0]);
1026 close (sigpipe [1]);
1027
1028 while (pipe (sigpipe))
1029 syserr ("(libev) error creating pipe");
1030
1031 siginit (EV_A);
1032 }
1033
1034 postfork = 0;
1035 }
1036
1037 #if EV_MULTIPLICITY
1038 struct ev_loop *
1039 ev_loop_new (unsigned int flags)
1040 {
1041 struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
1042
1043 memset (loop, 0, sizeof (struct ev_loop));
1044
1045 loop_init (EV_A_ flags);
1046
1047 if (ev_backend (EV_A))
1048 return loop;
1049
1050 return 0;
1051 }
1052
1053 void
1054 ev_loop_destroy (EV_P)
1055 {
1056 loop_destroy (EV_A);
1057 ev_free (loop);
1058 }
1059
1060 void
1061 ev_loop_fork (EV_P)
1062 {
1063 postfork = 1;
1064 }
1065
1066 #endif
1067
1068 #if EV_MULTIPLICITY
1069 struct ev_loop *
1070 ev_default_loop_init (unsigned int flags)
1071 #else
1072 int
1073 ev_default_loop (unsigned int flags)
1074 #endif
1075 {
1076 if (sigpipe [0] == sigpipe [1])
1077 if (pipe (sigpipe))
1078 return 0;
1079
1080 if (!ev_default_loop_ptr)
1081 {
1082 #if EV_MULTIPLICITY
1083 struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
1084 #else
1085 ev_default_loop_ptr = 1;
1086 #endif
1087
1088 loop_init (EV_A_ flags);
1089
1090 if (ev_backend (EV_A))
1091 {
1092 siginit (EV_A);
1093
1094 #ifndef _WIN32
1095 ev_signal_init (&childev, childcb, SIGCHLD);
1096 ev_set_priority (&childev, EV_MAXPRI);
1097 ev_signal_start (EV_A_ &childev);
1098 ev_unref (EV_A); /* child watcher should not keep loop alive */
1099 #endif
1100 }
1101 else
1102 ev_default_loop_ptr = 0;
1103 }
1104
1105 return ev_default_loop_ptr;
1106 }
1107
1108 void
1109 ev_default_destroy (void)
1110 {
1111 #if EV_MULTIPLICITY
1112 struct ev_loop *loop = ev_default_loop_ptr;
1113 #endif
1114
1115 #ifndef _WIN32
1116 ev_ref (EV_A); /* child watcher */
1117 ev_signal_stop (EV_A_ &childev);
1118 #endif
1119
1120 ev_ref (EV_A); /* signal watcher */
1121 ev_io_stop (EV_A_ &sigev);
1122
1123 close (sigpipe [0]); sigpipe [0] = 0;
1124 close (sigpipe [1]); sigpipe [1] = 0;
1125
1126 loop_destroy (EV_A);
1127 }
1128
1129 void
1130 ev_default_fork (void)
1131 {
1132 #if EV_MULTIPLICITY
1133 struct ev_loop *loop = ev_default_loop_ptr;
1134 #endif
1135
1136 if (backend)
1137 postfork = 1;
1138 }
1139
1140 /*****************************************************************************/
1141
1142 int inline_size
1143 any_pending (EV_P)
1144 {
1145 int pri;
1146
1147 for (pri = NUMPRI; pri--; )
1148 if (pendingcnt [pri])
1149 return 1;
1150
1151 return 0;
1152 }
1153
1154 void inline_speed
1155 call_pending (EV_P)
1156 {
1157 int pri;
1158
1159 for (pri = NUMPRI; pri--; )
1160 while (pendingcnt [pri])
1161 {
1162 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
1163
1164 if (expect_true (p->w))
1165 {
1166 /*assert (("non-pending watcher on pending list", p->w->pending));*/
1167
1168 p->w->pending = 0;
1169 EV_CB_INVOKE (p->w, p->events);
1170 }
1171 }
1172 }
1173
1174 void inline_size
1175 timers_reify (EV_P)
1176 {
1177 while (timercnt && ((WT)timers [0])->at <= mn_now)
1178 {
1179 ev_timer *w = timers [0];
1180
1181 /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
1182
1183 /* first reschedule or stop timer */
1184 if (w->repeat)
1185 {
1186 assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
1187
1188 ((WT)w)->at += w->repeat;
1189 if (((WT)w)->at < mn_now)
1190 ((WT)w)->at = mn_now;
1191
1192 downheap ((WT *)timers, timercnt, 0);
1193 }
1194 else
1195 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
1196
1197 ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
1198 }
1199 }
1200
1201 #if EV_PERIODIC_ENABLE
1202 void inline_size
1203 periodics_reify (EV_P)
1204 {
1205 while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
1206 {
1207 ev_periodic *w = periodics [0];
1208
1209 /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
1210
1211 /* first reschedule or stop timer */
1212 if (w->reschedule_cb)
1213 {
1214 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
1215 assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
1216 downheap ((WT *)periodics, periodiccnt, 0);
1217 }
1218 else if (w->interval)
1219 {
1220 ((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
1221 assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
1222 downheap ((WT *)periodics, periodiccnt, 0);
1223 }
1224 else
1225 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
1226
1227 ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
1228 }
1229 }
1230
1231 static void noinline
1232 periodics_reschedule (EV_P)
1233 {
1234 int i;
1235
1236 /* adjust periodics after time jump */
1237 for (i = 0; i < periodiccnt; ++i)
1238 {
1239 ev_periodic *w = periodics [i];
1240
1241 if (w->reschedule_cb)
1242 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1243 else if (w->interval)
1244 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1245 }
1246
1247 /* now rebuild the heap */
1248 for (i = periodiccnt >> 1; i--; )
1249 downheap ((WT *)periodics, periodiccnt, i);
1250 }
1251 #endif
1252
1253 int inline_size
1254 time_update_monotonic (EV_P)
1255 {
1256 mn_now = get_clock ();
1257
1258 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
1259 {
1260 ev_rt_now = rtmn_diff + mn_now;
1261 return 0;
1262 }
1263 else
1264 {
1265 now_floor = mn_now;
1266 ev_rt_now = ev_time ();
1267 return 1;
1268 }
1269 }
1270
1271 void inline_size
1272 time_update (EV_P)
1273 {
1274 int i;
1275
1276 #if EV_USE_MONOTONIC
1277 if (expect_true (have_monotonic))
1278 {
1279 if (time_update_monotonic (EV_A))
1280 {
1281 ev_tstamp odiff = rtmn_diff;
1282
1283 /* loop a few times, before making important decisions.
1284 * on the choice of "4": one iteration isn't enough,
1285 * in case we get preempted during the calls to
1286 * ev_time and get_clock. a second call is almost guaranteed
1287 * to succeed in that case, though. and looping a few more times
1288 * doesn't hurt either as we only do this on time-jumps or
1289 * in the unlikely event of having been preempted here.
1290 */
1291 for (i = 4; --i; )
1292 {
1293 rtmn_diff = ev_rt_now - mn_now;
1294
1295 if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
1296 return; /* all is well */
1297
1298 ev_rt_now = ev_time ();
1299 mn_now = get_clock ();
1300 now_floor = mn_now;
1301 }
1302
1303 # if EV_PERIODIC_ENABLE
1304 periodics_reschedule (EV_A);
1305 # endif
1306 /* no timer adjustment, as the monotonic clock doesn't jump */
1307 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
1308 }
1309 }
1310 else
1311 #endif
1312 {
1313 ev_rt_now = ev_time ();
1314
1315 if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
1316 {
1317 #if EV_PERIODIC_ENABLE
1318 periodics_reschedule (EV_A);
1319 #endif
1320
1321 /* adjust timers. this is easy, as the offset is the same for all of them */
1322 for (i = 0; i < timercnt; ++i)
1323 ((WT)timers [i])->at += ev_rt_now - mn_now;
1324 }
1325
1326 mn_now = ev_rt_now;
1327 }
1328 }
1329
1330 void
1331 ev_ref (EV_P)
1332 {
1333 ++activecnt;
1334 }
1335
1336 void
1337 ev_unref (EV_P)
1338 {
1339 --activecnt;
1340 }
1341
1342 static int loop_done;
1343
1344 void
1345 ev_loop (EV_P_ int flags)
1346 {
1347 loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
1348 ? EVUNLOOP_ONE
1349 : EVUNLOOP_CANCEL;
1350
1351 call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
1352
1353 do
1354 {
1355 #ifndef _WIN32
1356 if (expect_false (curpid)) /* penalise the forking check even more */
1357 if (expect_false (getpid () != curpid))
1358 {
1359 curpid = getpid ();
1360 postfork = 1;
1361 }
1362 #endif
1363
1364 #if EV_FORK_ENABLE
1365 /* we might have forked, so queue fork handlers */
1366 if (expect_false (postfork))
1367 if (forkcnt)
1368 {
1369 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
1370 call_pending (EV_A);
1371 }
1372 #endif
1373
1374 /* queue check watchers (and execute them) */
1375 if (expect_false (preparecnt))
1376 {
1377 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
1378 call_pending (EV_A);
1379 }
1380
1381 if (expect_false (!activecnt))
1382 break;
1383
1384 /* we might have forked, so reify kernel state if necessary */
1385 if (expect_false (postfork))
1386 loop_fork (EV_A);
1387
1388 /* update fd-related kernel structures */
1389 fd_reify (EV_A);
1390
1391 /* calculate blocking time */
1392 {
1393 ev_tstamp block;
1394
1395 if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
1396 block = 0.; /* do not block at all */
1397 else
1398 {
1399 /* update time to cancel out callback processing overhead */
1400 #if EV_USE_MONOTONIC
1401 if (expect_true (have_monotonic))
1402 time_update_monotonic (EV_A);
1403 else
1404 #endif
1405 {
1406 ev_rt_now = ev_time ();
1407 mn_now = ev_rt_now;
1408 }
1409
1410 block = MAX_BLOCKTIME;
1411
1412 if (timercnt)
1413 {
1414 ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
1415 if (block > to) block = to;
1416 }
1417
1418 #if EV_PERIODIC_ENABLE
1419 if (periodiccnt)
1420 {
1421 ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
1422 if (block > to) block = to;
1423 }
1424 #endif
1425
1426 if (expect_false (block < 0.)) block = 0.;
1427 }
1428
1429 ++loop_count;
1430 backend_poll (EV_A_ block);
1431 }
1432
1433 /* update ev_rt_now, do magic */
1434 time_update (EV_A);
1435
1436 /* queue pending timers and reschedule them */
1437 timers_reify (EV_A); /* relative timers called last */
1438 #if EV_PERIODIC_ENABLE
1439 periodics_reify (EV_A); /* absolute timers called first */
1440 #endif
1441
1442 /* queue idle watchers unless other events are pending */
1443 if (idlecnt && !any_pending (EV_A))
1444 queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
1445
1446 /* queue check watchers, to be executed first */
1447 if (expect_false (checkcnt))
1448 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
1449
1450 call_pending (EV_A);
1451
1452 }
1453 while (expect_true (activecnt && !loop_done));
1454
1455 if (loop_done == EVUNLOOP_ONE)
1456 loop_done = EVUNLOOP_CANCEL;
1457 }
1458
1459 void
1460 ev_unloop (EV_P_ int how)
1461 {
1462 loop_done = how;
1463 }
1464
1465 /*****************************************************************************/
1466
1467 void inline_size
1468 wlist_add (WL *head, WL elem)
1469 {
1470 elem->next = *head;
1471 *head = elem;
1472 }
1473
1474 void inline_size
1475 wlist_del (WL *head, WL elem)
1476 {
1477 while (*head)
1478 {
1479 if (*head == elem)
1480 {
1481 *head = elem->next;
1482 return;
1483 }
1484
1485 head = &(*head)->next;
1486 }
1487 }
1488
1489 void inline_speed
1490 ev_clear_pending (EV_P_ W w)
1491 {
1492 if (w->pending)
1493 {
1494 pendings [ABSPRI (w)][w->pending - 1].w = 0;
1495 w->pending = 0;
1496 }
1497 }
1498
1499 void inline_speed
1500 ev_start (EV_P_ W w, int active)
1501 {
1502 if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
1503 if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
1504
1505 w->active = active;
1506 ev_ref (EV_A);
1507 }
1508
1509 void inline_size
1510 ev_stop (EV_P_ W w)
1511 {
1512 ev_unref (EV_A);
1513 w->active = 0;
1514 }
1515
1516 /*****************************************************************************/
1517
1518 void
1519 ev_io_start (EV_P_ ev_io *w)
1520 {
1521 int fd = w->fd;
1522
1523 if (expect_false (ev_is_active (w)))
1524 return;
1525
1526 assert (("ev_io_start called with negative fd", fd >= 0));
1527
1528 ev_start (EV_A_ (W)w, 1);
1529 array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
1530 wlist_add ((WL *)&anfds[fd].head, (WL)w);
1531
1532 fd_change (EV_A_ fd);
1533 }
1534
1535 void
1536 ev_io_stop (EV_P_ ev_io *w)
1537 {
1538 ev_clear_pending (EV_A_ (W)w);
1539 if (expect_false (!ev_is_active (w)))
1540 return;
1541
1542 assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
1543
1544 wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
1545 ev_stop (EV_A_ (W)w);
1546
1547 fd_change (EV_A_ w->fd);
1548 }
1549
1550 void
1551 ev_timer_start (EV_P_ ev_timer *w)
1552 {
1553 if (expect_false (ev_is_active (w)))
1554 return;
1555
1556 ((WT)w)->at += mn_now;
1557
1558 assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
1559
1560 ev_start (EV_A_ (W)w, ++timercnt);
1561 array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
1562 timers [timercnt - 1] = w;
1563 upheap ((WT *)timers, timercnt - 1);
1564
1565 /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
1566 }
1567
1568 void
1569 ev_timer_stop (EV_P_ ev_timer *w)
1570 {
1571 ev_clear_pending (EV_A_ (W)w);
1572 if (expect_false (!ev_is_active (w)))
1573 return;
1574
1575 assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
1576
1577 {
1578 int active = ((W)w)->active;
1579
1580 if (expect_true (--active < --timercnt))
1581 {
1582 timers [active] = timers [timercnt];
1583 adjustheap ((WT *)timers, timercnt, active);
1584 }
1585 }
1586
1587 ((WT)w)->at -= mn_now;
1588
1589 ev_stop (EV_A_ (W)w);
1590 }
1591
1592 void
1593 ev_timer_again (EV_P_ ev_timer *w)
1594 {
1595 if (ev_is_active (w))
1596 {
1597 if (w->repeat)
1598 {
1599 ((WT)w)->at = mn_now + w->repeat;
1600 adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
1601 }
1602 else
1603 ev_timer_stop (EV_A_ w);
1604 }
1605 else if (w->repeat)
1606 {
1607 w->at = w->repeat;
1608 ev_timer_start (EV_A_ w);
1609 }
1610 }
1611
1612 #if EV_PERIODIC_ENABLE
1613 void
1614 ev_periodic_start (EV_P_ ev_periodic *w)
1615 {
1616 if (expect_false (ev_is_active (w)))
1617 return;
1618
1619 if (w->reschedule_cb)
1620 ((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
1621 else if (w->interval)
1622 {
1623 assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
1624 /* this formula differs from the one in periodic_reify because we do not always round up */
1625 ((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
1626 }
1627
1628 ev_start (EV_A_ (W)w, ++periodiccnt);
1629 array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
1630 periodics [periodiccnt - 1] = w;
1631 upheap ((WT *)periodics, periodiccnt - 1);
1632
1633 /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
1634 }
1635
1636 void
1637 ev_periodic_stop (EV_P_ ev_periodic *w)
1638 {
1639 ev_clear_pending (EV_A_ (W)w);
1640 if (expect_false (!ev_is_active (w)))
1641 return;
1642
1643 assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
1644
1645 {
1646 int active = ((W)w)->active;
1647
1648 if (expect_true (--active < --periodiccnt))
1649 {
1650 periodics [active] = periodics [periodiccnt];
1651 adjustheap ((WT *)periodics, periodiccnt, active);
1652 }
1653 }
1654
1655 ev_stop (EV_A_ (W)w);
1656 }
1657
1658 void
1659 ev_periodic_again (EV_P_ ev_periodic *w)
1660 {
1661 /* TODO: use adjustheap and recalculation */
1662 ev_periodic_stop (EV_A_ w);
1663 ev_periodic_start (EV_A_ w);
1664 }
1665 #endif
1666
1667 #ifndef SA_RESTART
1668 # define SA_RESTART 0
1669 #endif
1670
1671 void
1672 ev_signal_start (EV_P_ ev_signal *w)
1673 {
1674 #if EV_MULTIPLICITY
1675 assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1676 #endif
1677 if (expect_false (ev_is_active (w)))
1678 return;
1679
1680 assert (("ev_signal_start called with illegal signal number", w->signum > 0));
1681
1682 ev_start (EV_A_ (W)w, 1);
1683 array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
1684 wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
1685
1686 if (!((WL)w)->next)
1687 {
1688 #if _WIN32
1689 signal (w->signum, sighandler);
1690 #else
1691 struct sigaction sa;
1692 sa.sa_handler = sighandler;
1693 sigfillset (&sa.sa_mask);
1694 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
1695 sigaction (w->signum, &sa, 0);
1696 #endif
1697 }
1698 }
1699
1700 void
1701 ev_signal_stop (EV_P_ ev_signal *w)
1702 {
1703 ev_clear_pending (EV_A_ (W)w);
1704 if (expect_false (!ev_is_active (w)))
1705 return;
1706
1707 wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
1708 ev_stop (EV_A_ (W)w);
1709
1710 if (!signals [w->signum - 1].head)
1711 signal (w->signum, SIG_DFL);
1712 }
1713
1714 void
1715 ev_child_start (EV_P_ ev_child *w)
1716 {
1717 #if EV_MULTIPLICITY
1718 assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
1719 #endif
1720 if (expect_false (ev_is_active (w)))
1721 return;
1722
1723 ev_start (EV_A_ (W)w, 1);
1724 wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1725 }
1726
1727 void
1728 ev_child_stop (EV_P_ ev_child *w)
1729 {
1730 ev_clear_pending (EV_A_ (W)w);
1731 if (expect_false (!ev_is_active (w)))
1732 return;
1733
1734 wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
1735 ev_stop (EV_A_ (W)w);
1736 }
1737
1738 #if EV_STAT_ENABLE
1739
1740 # ifdef _WIN32
1741 # undef lstat
1742 # define lstat(a,b) _stati64 (a,b)
1743 # endif
1744
1745 #define DEF_STAT_INTERVAL 5.0074891
1746 #define MIN_STAT_INTERVAL 0.1074891
1747
1748 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
1749
1750 #if EV_USE_INOTIFY
1751 # define EV_INOTIFY_BUFSIZE 8192
1752
1753 static void noinline
1754 infy_add (EV_P_ ev_stat *w)
1755 {
1756 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);
1757
1758 if (w->wd < 0)
1759 {
1760 ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
1761
1762 /* monitor some parent directory for speedup hints */
1763 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
1764 {
1765 char path [4096];
1766 strcpy (path, w->path);
1767
1768 do
1769 {
1770 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
1771 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
1772
1773 char *pend = strrchr (path, '/');
1774
1775 if (!pend)
1776 break; /* whoops, no '/', complain to your admin */
1777
1778 *pend = 0;
1779 w->wd = inotify_add_watch (fs_fd, path, mask);
1780 }
1781 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
1782 }
1783 }
1784 else
1785 ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
1786
1787 if (w->wd >= 0)
1788 wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
1789 }
1790
1791 static void noinline
1792 infy_del (EV_P_ ev_stat *w)
1793 {
1794 int slot;
1795 int wd = w->wd;
1796
1797 if (wd < 0)
1798 return;
1799
1800 w->wd = -2;
1801 slot = wd & (EV_INOTIFY_HASHSIZE - 1);
1802 wlist_del (&fs_hash [slot].head, (WL)w);
1803
1804 /* remove this watcher, if others are watching it, they will rearm */
1805 inotify_rm_watch (fs_fd, wd);
1806 }
1807
1808 static void noinline
1809 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
1810 {
1811 if (slot < 0)
1812 /* overflow, need to check for all hahs slots */
1813 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1814 infy_wd (EV_A_ slot, wd, ev);
1815 else
1816 {
1817 WL w_;
1818
1819 for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
1820 {
1821 ev_stat *w = (ev_stat *)w_;
1822 w_ = w_->next; /* lets us remove this watcher and all before it */
1823
1824 if (w->wd == wd || wd == -1)
1825 {
1826 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
1827 {
1828 w->wd = -1;
1829 infy_add (EV_A_ w); /* re-add, no matter what */
1830 }
1831
1832 stat_timer_cb (EV_A_ &w->timer, 0);
1833 }
1834 }
1835 }
1836 }
1837
1838 static void
1839 infy_cb (EV_P_ ev_io *w, int revents)
1840 {
1841 char buf [EV_INOTIFY_BUFSIZE];
1842 struct inotify_event *ev = (struct inotify_event *)buf;
1843 int ofs;
1844 int len = read (fs_fd, buf, sizeof (buf));
1845
1846 for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
1847 infy_wd (EV_A_ ev->wd, ev->wd, ev);
1848 }
1849
1850 void inline_size
1851 infy_init (EV_P)
1852 {
1853 if (fs_fd != -2)
1854 return;
1855
1856 fs_fd = inotify_init ();
1857
1858 if (fs_fd >= 0)
1859 {
1860 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
1861 ev_set_priority (&fs_w, EV_MAXPRI);
1862 ev_io_start (EV_A_ &fs_w);
1863 }
1864 }
1865
1866 void inline_size
1867 infy_fork (EV_P)
1868 {
1869 int slot;
1870
1871 if (fs_fd < 0)
1872 return;
1873
1874 close (fs_fd);
1875 fs_fd = inotify_init ();
1876
1877 for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
1878 {
1879 WL w_ = fs_hash [slot].head;
1880 fs_hash [slot].head = 0;
1881
1882 while (w_)
1883 {
1884 ev_stat *w = (ev_stat *)w_;
1885 w_ = w_->next; /* lets us add this watcher */
1886
1887 w->wd = -1;
1888
1889 if (fs_fd >= 0)
1890 infy_add (EV_A_ w); /* re-add, no matter what */
1891 else
1892 ev_timer_start (EV_A_ &w->timer);
1893 }
1894
1895 }
1896 }
1897
1898 #endif
1899
1900 void
1901 ev_stat_stat (EV_P_ ev_stat *w)
1902 {
1903 if (lstat (w->path, &w->attr) < 0)
1904 w->attr.st_nlink = 0;
1905 else if (!w->attr.st_nlink)
1906 w->attr.st_nlink = 1;
1907 }
1908
1909 static void noinline
1910 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
1911 {
1912 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
1913
1914 /* we copy this here each the time so that */
1915 /* prev has the old value when the callback gets invoked */
1916 w->prev = w->attr;
1917 ev_stat_stat (EV_A_ w);
1918
1919 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
1920 if (
1921 w->prev.st_dev != w->attr.st_dev
1922 || w->prev.st_ino != w->attr.st_ino
1923 || w->prev.st_mode != w->attr.st_mode
1924 || w->prev.st_nlink != w->attr.st_nlink
1925 || w->prev.st_uid != w->attr.st_uid
1926 || w->prev.st_gid != w->attr.st_gid
1927 || w->prev.st_rdev != w->attr.st_rdev
1928 || w->prev.st_size != w->attr.st_size
1929 || w->prev.st_atime != w->attr.st_atime
1930 || w->prev.st_mtime != w->attr.st_mtime
1931 || w->prev.st_ctime != w->attr.st_ctime
1932 ) {
1933 #if EV_USE_INOTIFY
1934 infy_del (EV_A_ w);
1935 infy_add (EV_A_ w);
1936 ev_stat_stat (EV_A_ w); /* avoid race... */
1937 #endif
1938
1939 ev_feed_event (EV_A_ w, EV_STAT);
1940 }
1941 }
1942
1943 void
1944 ev_stat_start (EV_P_ ev_stat *w)
1945 {
1946 if (expect_false (ev_is_active (w)))
1947 return;
1948
1949 /* since we use memcmp, we need to clear any padding data etc. */
1950 memset (&w->prev, 0, sizeof (ev_statdata));
1951 memset (&w->attr, 0, sizeof (ev_statdata));
1952
1953 ev_stat_stat (EV_A_ w);
1954
1955 if (w->interval < MIN_STAT_INTERVAL)
1956 w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
1957
1958 ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
1959 ev_set_priority (&w->timer, ev_priority (w));
1960
1961 #if EV_USE_INOTIFY
1962 infy_init (EV_A);
1963
1964 if (fs_fd >= 0)
1965 infy_add (EV_A_ w);
1966 else
1967 #endif
1968 ev_timer_start (EV_A_ &w->timer);
1969
1970 ev_start (EV_A_ (W)w, 1);
1971 }
1972
1973 void
1974 ev_stat_stop (EV_P_ ev_stat *w)
1975 {
1976 ev_clear_pending (EV_A_ (W)w);
1977 if (expect_false (!ev_is_active (w)))
1978 return;
1979
1980 #if EV_USE_INOTIFY
1981 infy_del (EV_A_ w);
1982 #endif
1983 ev_timer_stop (EV_A_ &w->timer);
1984
1985 ev_stop (EV_A_ (W)w);
1986 }
1987 #endif
1988
1989 void
1990 ev_idle_start (EV_P_ ev_idle *w)
1991 {
1992 if (expect_false (ev_is_active (w)))
1993 return;
1994
1995 ev_start (EV_A_ (W)w, ++idlecnt);
1996 array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
1997 idles [idlecnt - 1] = w;
1998 }
1999
2000 void
2001 ev_idle_stop (EV_P_ ev_idle *w)
2002 {
2003 ev_clear_pending (EV_A_ (W)w);
2004 if (expect_false (!ev_is_active (w)))
2005 return;
2006
2007 {
2008 int active = ((W)w)->active;
2009 idles [active - 1] = idles [--idlecnt];
2010 ((W)idles [active - 1])->active = active;
2011 }
2012
2013 ev_stop (EV_A_ (W)w);
2014 }
2015
2016 void
2017 ev_prepare_start (EV_P_ ev_prepare *w)
2018 {
2019 if (expect_false (ev_is_active (w)))
2020 return;
2021
2022 ev_start (EV_A_ (W)w, ++preparecnt);
2023 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
2024 prepares [preparecnt - 1] = w;
2025 }
2026
2027 void
2028 ev_prepare_stop (EV_P_ ev_prepare *w)
2029 {
2030 ev_clear_pending (EV_A_ (W)w);
2031 if (expect_false (!ev_is_active (w)))
2032 return;
2033
2034 {
2035 int active = ((W)w)->active;
2036 prepares [active - 1] = prepares [--preparecnt];
2037 ((W)prepares [active - 1])->active = active;
2038 }
2039
2040 ev_stop (EV_A_ (W)w);
2041 }
2042
2043 void
2044 ev_check_start (EV_P_ ev_check *w)
2045 {
2046 if (expect_false (ev_is_active (w)))
2047 return;
2048
2049 ev_start (EV_A_ (W)w, ++checkcnt);
2050 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
2051 checks [checkcnt - 1] = w;
2052 }
2053
2054 void
2055 ev_check_stop (EV_P_ ev_check *w)
2056 {
2057 ev_clear_pending (EV_A_ (W)w);
2058 if (expect_false (!ev_is_active (w)))
2059 return;
2060
2061 {
2062 int active = ((W)w)->active;
2063 checks [active - 1] = checks [--checkcnt];
2064 ((W)checks [active - 1])->active = active;
2065 }
2066
2067 ev_stop (EV_A_ (W)w);
2068 }
2069
2070 #if EV_EMBED_ENABLE
2071 void noinline
2072 ev_embed_sweep (EV_P_ ev_embed *w)
2073 {
2074 ev_loop (w->loop, EVLOOP_NONBLOCK);
2075 }
2076
2077 static void
2078 embed_cb (EV_P_ ev_io *io, int revents)
2079 {
2080 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
2081
2082 if (ev_cb (w))
2083 ev_feed_event (EV_A_ (W)w, EV_EMBED);
2084 else
2085 ev_embed_sweep (loop, w);
2086 }
2087
2088 void
2089 ev_embed_start (EV_P_ ev_embed *w)
2090 {
2091 if (expect_false (ev_is_active (w)))
2092 return;
2093
2094 {
2095 struct ev_loop *loop = w->loop;
2096 assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
2097 ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
2098 }
2099
2100 ev_set_priority (&w->io, ev_priority (w));
2101 ev_io_start (EV_A_ &w->io);
2102
2103 ev_start (EV_A_ (W)w, 1);
2104 }
2105
2106 void
2107 ev_embed_stop (EV_P_ ev_embed *w)
2108 {
2109 ev_clear_pending (EV_A_ (W)w);
2110 if (expect_false (!ev_is_active (w)))
2111 return;
2112
2113 ev_io_stop (EV_A_ &w->io);
2114
2115 ev_stop (EV_A_ (W)w);
2116 }
2117 #endif
2118
2119 #if EV_FORK_ENABLE
2120 void
2121 ev_fork_start (EV_P_ ev_fork *w)
2122 {
2123 if (expect_false (ev_is_active (w)))
2124 return;
2125
2126 ev_start (EV_A_ (W)w, ++forkcnt);
2127 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
2128 forks [forkcnt - 1] = w;
2129 }
2130
2131 void
2132 ev_fork_stop (EV_P_ ev_fork *w)
2133 {
2134 ev_clear_pending (EV_A_ (W)w);
2135 if (expect_false (!ev_is_active (w)))
2136 return;
2137
2138 {
2139 int active = ((W)w)->active;
2140 forks [active - 1] = forks [--forkcnt];
2141 ((W)forks [active - 1])->active = active;
2142 }
2143
2144 ev_stop (EV_A_ (W)w);
2145 }
2146 #endif
2147
2148 /*****************************************************************************/
2149
2150 struct ev_once
2151 {
2152 ev_io io;
2153 ev_timer to;
2154 void (*cb)(int revents, void *arg);
2155 void *arg;
2156 };
2157
2158 static void
2159 once_cb (EV_P_ struct ev_once *once, int revents)
2160 {
2161 void (*cb)(int revents, void *arg) = once->cb;
2162 void *arg = once->arg;
2163
2164 ev_io_stop (EV_A_ &once->io);
2165 ev_timer_stop (EV_A_ &once->to);
2166 ev_free (once);
2167
2168 cb (revents, arg);
2169 }
2170
2171 static void
2172 once_cb_io (EV_P_ ev_io *w, int revents)
2173 {
2174 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
2175 }
2176
2177 static void
2178 once_cb_to (EV_P_ ev_timer *w, int revents)
2179 {
2180 once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
2181 }
2182
2183 void
2184 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
2185 {
2186 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
2187
2188 if (expect_false (!once))
2189 {
2190 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
2191 return;
2192 }
2193
2194 once->cb = cb;
2195 once->arg = arg;
2196
2197 ev_init (&once->io, once_cb_io);
2198 if (fd >= 0)
2199 {
2200 ev_io_set (&once->io, fd, events);
2201 ev_io_start (EV_A_ &once->io);
2202 }
2203
2204 ev_init (&once->to, once_cb_to);
2205 if (timeout >= 0.)
2206 {
2207 ev_timer_set (&once->to, timeout, 0.);
2208 ev_timer_start (EV_A_ &once->to);
2209 }
2210 }
2211
2212 #ifdef __cplusplus
2213 }
2214 #endif
2215