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Comparing libev/ev_kqueue.c (file contents):
Revision 1.25 by root, Fri Nov 23 19:13:33 2007 UTC vs.
Revision 1.26 by root, Mon Nov 26 08:04:03 2007 UTC

1/* 1/*
2 * libev kqueue backend
3 *
2 * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> 4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3 * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
4 * All rights reserved. 5 * All rights reserved.
5 * 6 *
6 * Redistribution and use in source and binary forms, with or without 7 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions 8 * modification, are permitted provided that the following conditions are
8 * are met: 9 * met:
9 * 10 *
10 * 1. Redistributions of source code must retain the above copyright 11 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer. 12 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 * 13 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * * Redistributions in binary form must reproduce the above
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * copyright notice, this list of conditions and the following
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * disclaimer in the documentation and/or other materials provided
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 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,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */ 30 */
29 31
30#include <sys/types.h> 32#include <sys/types.h>
31#include <sys/time.h> 33#include <sys/time.h>
32#include <sys/queue.h> 34#include <sys/queue.h>
… …
104 106
105 if (expect_false (kqueue_events [i].flags & EV_ERROR)) 107 if (expect_false (kqueue_events [i].flags & EV_ERROR))
106 { 108 {
107 int err = kqueue_events [i].data; 109 int err = kqueue_events [i].data;
108 110
109 /*
110 * errors that may happen
111 * EBADF happens when the file discriptor has been
112 * closed,
113 * ENOENT when the file descriptor was closed and
114 * then reopened.
115 * EINVAL for some reasons not understood; EINVAL
116 * should not be returned ever; but FreeBSD does :-\
117 */
118
119 /* we are only interested in errors for fds that we are interested in :) */ 111 /* we are only interested in errors for fds that we are interested in :) */
120 if (anfds [fd].events) 112 if (anfds [fd].events)
121 { 113 {
122 if (err == ENOENT) /* resubmit changes on ENOENT */ 114 if (err == ENOENT) /* resubmit changes on ENOENT */
123 kqueue_modify (EV_A_ fd, 0, anfds [fd].events); 115 kqueue_modify (EV_A_ fd, 0, anfds [fd].events);
… …
159 if ((backend_fd = kqueue ()) < 0) 151 if ((backend_fd = kqueue ()) < 0)
160 return 0; 152 return 0;
161 153
162 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ 154 fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
163 155
164 /* Check for Mac OS X kqueue bug. */ 156 /* fudge *might* be zero from the documentation, but bsd docs are notoriously wrong */
165 ch.ident = -1;
166 ch.filter = EVFILT_READ;
167 ch.flags = EV_ADD;
168
169 /*
170 * If kqueue works, then kevent will succeed, and it will
171 * stick an error in ev. If kqueue is broken, then
172 * kevent will fail.
173 */
174 if (kevent (backend_fd, &ch, 1, &ev, 1, 0) != 1
175 || ev.ident != -1
176 || ev.flags != EV_ERROR)
177 {
178 /* detected broken kqueue */
179 close (backend_fd);
180 return 0;
181 }
182
183 backend_fudge = 1e-3; /* needed to compensate for kevent returning early */ 157 backend_fudge = 1e-3; /* needed to compensate for kevent returning early */
184 backend_modify = kqueue_modify; 158 backend_modify = kqueue_modify;
185 backend_poll = kqueue_poll; 159 backend_poll = kqueue_poll;
186 160
187 kqueue_eventmax = 64; /* intiial number of events receivable per poll */ 161 kqueue_eventmax = 64; /* initial number of events receivable per poll */
188 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); 162 kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
189 163
190 kqueue_changes = 0; 164 kqueue_changes = 0;
191 kqueue_changemax = 0; 165 kqueue_changemax = 0;
192 kqueue_changecnt = 0; 166 kqueue_changecnt = 0;

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