1 | /* |
1 | /* |
2 | * libev kqueue backend |
2 | * libev kqueue backend |
3 | * |
3 | * |
4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de> |
5 | * All rights reserved. |
5 | * All rights reserved. |
6 | * |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * modification, are permitted provided that the following conditions are |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * met: |
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10 | * |
9 | * |
11 | * * Redistributions of source code must retain the above copyright |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
12 | * notice, this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
13 | * |
12 | * |
14 | * * Redistributions in binary form must reproduce the above |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
15 | * copyright notice, this list of conditions and the following |
14 | * notice, this list of conditions and the following disclaimer in the |
16 | * disclaimer in the documentation and/or other materials provided |
15 | * documentation and/or other materials provided with the distribution. |
17 | * with the distribution. |
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18 | * |
16 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
30 | */ |
38 | */ |
31 | |
39 | |
32 | #include <sys/types.h> |
40 | #include <sys/types.h> |
33 | #include <sys/time.h> |
41 | #include <sys/time.h> |
34 | #include <sys/queue.h> |
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35 | #include <sys/event.h> |
42 | #include <sys/event.h> |
36 | #include <string.h> |
43 | #include <string.h> |
37 | #include <errno.h> |
44 | #include <errno.h> |
38 | |
45 | |
39 | void inline_speed |
46 | void inline_speed |
… | |
… | |
43 | array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2); |
50 | array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2); |
44 | |
51 | |
45 | EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0); |
52 | EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0); |
46 | } |
53 | } |
47 | |
54 | |
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55 | /* OS X at least needs this */ |
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56 | #ifndef EV_ENABLE |
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57 | # define EV_ENABLE 0 |
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58 | #endif |
48 | #ifndef NOTE_EOF |
59 | #ifndef NOTE_EOF |
49 | # define NOTE_EOF 0 |
60 | # define NOTE_EOF 0 |
50 | #endif |
61 | #endif |
51 | |
62 | |
52 | static void |
63 | static void |
… | |
… | |
63 | |
74 | |
64 | /* to detect close/reopen reliably, we have to re-add */ |
75 | /* to detect close/reopen reliably, we have to re-add */ |
65 | /* event requests even when oev == nev */ |
76 | /* event requests even when oev == nev */ |
66 | |
77 | |
67 | if (nev & EV_READ) |
78 | if (nev & EV_READ) |
68 | kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF); |
79 | kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD | EV_ENABLE, NOTE_EOF); |
69 | |
80 | |
70 | if (nev & EV_WRITE) |
81 | if (nev & EV_WRITE) |
71 | kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); |
82 | kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD | EV_ENABLE, NOTE_EOF); |
72 | } |
83 | } |
73 | |
84 | |
74 | static void |
85 | static void |
75 | kqueue_poll (EV_P_ ev_tstamp timeout) |
86 | kqueue_poll (EV_P_ ev_tstamp timeout) |
76 | { |
87 | { |
… | |
… | |
83 | ev_free (kqueue_events); |
94 | ev_free (kqueue_events); |
84 | kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt); |
95 | kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt); |
85 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
96 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
86 | } |
97 | } |
87 | |
98 | |
88 | ts.tv_sec = (time_t)timeout; |
99 | EV_RELEASE_CB; |
89 | ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9); |
100 | EV_TS_SET (ts, timeout); |
90 | res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); |
101 | res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); |
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102 | EV_ACQUIRE_CB; |
91 | kqueue_changecnt = 0; |
103 | kqueue_changecnt = 0; |
92 | |
104 | |
93 | if (expect_false (res < 0)) |
105 | if (expect_false (res < 0)) |
94 | { |
106 | { |
95 | if (errno != EINTR) |
107 | if (errno != EINTR) |
96 | syserr ("(libev) kevent"); |
108 | ev_syserr ("(libev) kevent"); |
97 | |
109 | |
98 | return; |
110 | return; |
99 | } |
111 | } |
100 | |
112 | |
101 | for (i = 0; i < res; ++i) |
113 | for (i = 0; i < res; ++i) |
102 | { |
114 | { |
103 | int fd = kqueue_events [i].ident; |
115 | int fd = kqueue_events [i].ident; |
104 | |
116 | |
105 | if (expect_false (kqueue_events [i].flags & EV_ERROR)) |
117 | if (expect_false (kqueue_events [i].flags & EV_ERROR)) |
106 | { |
118 | { |
107 | int err = kqueue_events [i].data; |
119 | int err = kqueue_events [i].data; |
108 | |
120 | |
109 | /* we are only interested in errors for fds that we are interested in :) */ |
121 | /* we are only interested in errors for fds that we are interested in :) */ |
110 | if (anfds [fd].events) |
122 | if (anfds [fd].events) |
111 | { |
123 | { |
112 | if (err == ENOENT) /* resubmit changes on ENOENT */ |
124 | if (err == ENOENT) /* resubmit changes on ENOENT */ |
113 | kqueue_modify (EV_A_ fd, 0, anfds [fd].events); |
125 | kqueue_modify (EV_A_ fd, 0, anfds [fd].events); |
114 | else if (err == EBADF) /* on EBADF, we re-check the fd */ |
126 | else if (err == EBADF) /* on EBADF, we re-check the fd */ |
115 | { |
127 | { |
116 | if (fd_valid (fd)) |
128 | if (fd_valid (fd)) |
… | |
… | |
118 | else |
130 | else |
119 | fd_kill (EV_A_ fd); |
131 | fd_kill (EV_A_ fd); |
120 | } |
132 | } |
121 | else /* on all other errors, we error out on the fd */ |
133 | else /* on all other errors, we error out on the fd */ |
122 | fd_kill (EV_A_ fd); |
134 | fd_kill (EV_A_ fd); |
123 | } |
135 | } |
124 | } |
136 | } |
125 | else |
137 | else |
126 | fd_event ( |
138 | fd_event ( |
127 | EV_A_ |
139 | EV_A_ |
128 | fd, |
140 | fd, |
… | |
… | |
141 | } |
153 | } |
142 | |
154 | |
143 | int inline_size |
155 | int inline_size |
144 | kqueue_init (EV_P_ int flags) |
156 | kqueue_init (EV_P_ int flags) |
145 | { |
157 | { |
146 | /* Initalize the kernel queue */ |
158 | /* Initialize the kernel queue */ |
147 | if ((backend_fd = kqueue ()) < 0) |
159 | if ((backend_fd = kqueue ()) < 0) |
148 | return 0; |
160 | return 0; |
149 | |
161 | |
150 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
162 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
151 | |
163 | |
152 | backend_fudge = 0.; |
164 | backend_mintime = 1e-9; /* apparently, they did the right thing in freebsd */ |
153 | backend_modify = kqueue_modify; |
165 | backend_modify = kqueue_modify; |
154 | backend_poll = kqueue_poll; |
166 | backend_poll = kqueue_poll; |
155 | |
167 | |
156 | kqueue_eventmax = 64; /* initial number of events receivable per poll */ |
168 | kqueue_eventmax = 64; /* initial number of events receivable per poll */ |
157 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
169 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
158 | |
170 | |
159 | kqueue_changes = 0; |
171 | kqueue_changes = 0; |
… | |
… | |
174 | kqueue_fork (EV_P) |
186 | kqueue_fork (EV_P) |
175 | { |
187 | { |
176 | close (backend_fd); |
188 | close (backend_fd); |
177 | |
189 | |
178 | while ((backend_fd = kqueue ()) < 0) |
190 | while ((backend_fd = kqueue ()) < 0) |
179 | syserr ("(libev) kqueue"); |
191 | ev_syserr ("(libev) kqueue"); |
180 | |
192 | |
181 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
193 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
182 | |
194 | |
183 | /* re-register interest in fds */ |
195 | /* re-register interest in fds */ |
184 | fd_rearm_all (EV_A); |
196 | fd_rearm_all (EV_A); |