1 |
root |
1.1 |
/* |
2 |
|
|
* Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> |
3 |
|
|
* Copyright 2000-2002 Niels Provos <provos@citi.umich.edu> |
4 |
|
|
* All rights reserved. |
5 |
|
|
* |
6 |
|
|
* Redistribution and use in source and binary forms, with or without |
7 |
|
|
* modification, are permitted provided that the following conditions |
8 |
|
|
* are met: |
9 |
|
|
* |
10 |
|
|
* 1. Redistributions of source code must retain the above copyright |
11 |
|
|
* 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 |
|
|
* |
18 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 |
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 |
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 |
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 |
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 |
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 |
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 |
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 |
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 |
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 |
|
|
*/ |
29 |
|
|
|
30 |
|
|
#include <sys/types.h> |
31 |
|
|
#include <sys/time.h> |
32 |
|
|
#include <sys/queue.h> |
33 |
|
|
#include <sys/event.h> |
34 |
|
|
#include <string.h> |
35 |
|
|
#include <errno.h> |
36 |
|
|
|
37 |
|
|
static int kq_fd; |
38 |
|
|
static struct kevent *kq_changes; |
39 |
|
|
static int kq_changemax, kq_changecnt; |
40 |
|
|
static struct kevent *kq_events; |
41 |
|
|
static int kq_eventmax; |
42 |
|
|
|
43 |
|
|
static void |
44 |
|
|
kqueue_change (int fd, int filter, int flags, int fflags) |
45 |
|
|
{ |
46 |
|
|
struct kevent *ke; |
47 |
|
|
|
48 |
|
|
array_needsize (kq_changes, kq_changemax, ++kq_changecnt, ); |
49 |
|
|
|
50 |
|
|
ke = &kq_changes [kq_changecnt - 1]; |
51 |
|
|
memset (ke, 0, sizeof (struct kevent)); |
52 |
|
|
ke->ident = fd; |
53 |
|
|
ke->filter = filter; |
54 |
|
|
ke->flags = flags; |
55 |
|
|
ke->fflags = fflags; |
56 |
|
|
} |
57 |
|
|
|
58 |
root |
1.4 |
#ifndef NOTE_EOF |
59 |
|
|
# define NOTE_EOF 0 |
60 |
|
|
#endif |
61 |
|
|
|
62 |
root |
1.1 |
static void |
63 |
|
|
kqueue_modify (int fd, int oev, int nev) |
64 |
|
|
{ |
65 |
root |
1.4 |
if ((oev ^ nev) & EV_READ) |
66 |
root |
1.1 |
{ |
67 |
|
|
if (nev & EV_READ) |
68 |
|
|
kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF); |
69 |
|
|
else |
70 |
|
|
kqueue_change (fd, EVFILT_READ, EV_DELETE, 0); |
71 |
|
|
} |
72 |
|
|
|
73 |
root |
1.4 |
if ((oev ^ nev) & EV_WRITE) |
74 |
root |
1.1 |
{ |
75 |
|
|
if (nev & EV_WRITE) |
76 |
|
|
kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); |
77 |
|
|
else |
78 |
|
|
kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0); |
79 |
|
|
} |
80 |
|
|
} |
81 |
|
|
|
82 |
|
|
static void |
83 |
|
|
kqueue_poll (ev_tstamp timeout) |
84 |
|
|
{ |
85 |
|
|
int res, i; |
86 |
|
|
struct timespec ts; |
87 |
|
|
|
88 |
|
|
ts.tv_sec = (time_t)timeout; |
89 |
|
|
ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; |
90 |
|
|
res = kevent (kq_fd, kq_changes, kq_changecnt, kq_events, kq_eventmax, &ts); |
91 |
|
|
kq_changecnt = 0; |
92 |
|
|
|
93 |
|
|
if (res < 0) |
94 |
|
|
return; |
95 |
|
|
|
96 |
|
|
for (i = 0; i < res; ++i) |
97 |
|
|
{ |
98 |
|
|
if (kq_events [i].flags & EV_ERROR) |
99 |
|
|
{ |
100 |
|
|
/* |
101 |
|
|
* Error messages that can happen, when a delete fails. |
102 |
|
|
* EBADF happens when the file discriptor has been |
103 |
|
|
* closed, |
104 |
|
|
* ENOENT when the file discriptor was closed and |
105 |
|
|
* then reopened. |
106 |
|
|
* EINVAL for some reasons not understood; EINVAL |
107 |
|
|
* should not be returned ever; but FreeBSD does :-\ |
108 |
|
|
* An error is also indicated when a callback deletes |
109 |
|
|
* an event we are still processing. In that case |
110 |
|
|
* the data field is set to ENOENT. |
111 |
|
|
*/ |
112 |
root |
1.4 |
if (kq_events [i].data == EBADF) |
113 |
|
|
fd_kill (kq_events [i].ident); |
114 |
root |
1.1 |
} |
115 |
|
|
else |
116 |
root |
1.3 |
fd_event ( |
117 |
root |
1.4 |
kq_events [i].ident, |
118 |
|
|
kq_events [i].filter == EVFILT_READ ? EV_READ |
119 |
|
|
: kq_events [i].filter == EVFILT_WRITE ? EV_WRITE |
120 |
root |
1.1 |
: 0 |
121 |
|
|
); |
122 |
|
|
} |
123 |
|
|
|
124 |
|
|
if (expect_false (res == kq_eventmax)) |
125 |
|
|
{ |
126 |
|
|
free (kq_events); |
127 |
|
|
kq_eventmax = array_roundsize (kq_events, kq_eventmax << 1); |
128 |
|
|
kq_events = malloc (sizeof (struct kevent) * kq_eventmax); |
129 |
|
|
} |
130 |
|
|
} |
131 |
|
|
|
132 |
|
|
static void |
133 |
root |
1.4 |
kqueue_init (int flags) |
134 |
root |
1.1 |
{ |
135 |
root |
1.2 |
struct kevent ch, ev; |
136 |
|
|
|
137 |
root |
1.1 |
/* Initalize the kernel queue */ |
138 |
root |
1.2 |
if ((kq_fd = kqueue ()) < 0) |
139 |
root |
1.1 |
return; |
140 |
|
|
|
141 |
root |
1.2 |
/* Check for Mac OS X kqueue bug. */ |
142 |
|
|
ch.ident = -1; |
143 |
|
|
ch.filter = EVFILT_READ; |
144 |
|
|
ch.flags = EV_ADD; |
145 |
root |
1.1 |
|
146 |
|
|
/* |
147 |
|
|
* If kqueue works, then kevent will succeed, and it will |
148 |
root |
1.4 |
* stick an error in ev. If kqueue is broken, then |
149 |
root |
1.1 |
* kevent will fail. |
150 |
|
|
*/ |
151 |
root |
1.2 |
if (kevent (kq_fd, &ch, 1, &ev, 1, 0) != 1 |
152 |
|
|
|| ev.ident != -1 |
153 |
|
|
|| ev.flags != EV_ERROR) |
154 |
root |
1.1 |
{ |
155 |
|
|
/* detected broken kqueue */ |
156 |
|
|
close (kq_fd); |
157 |
|
|
return; |
158 |
|
|
} |
159 |
|
|
|
160 |
|
|
ev_method = EVMETHOD_KQUEUE; |
161 |
|
|
method_fudge = 1e-3; /* needed to compensate for kevent returning early */ |
162 |
|
|
method_modify = kq_modify; |
163 |
|
|
method_poll = kq_poll; |
164 |
|
|
|
165 |
|
|
kq_eventmax = 64; /* intiial number of events receivable per poll */ |
166 |
|
|
kq_events = malloc (sizeof (struct kevent) * kq_eventmax); |
167 |
|
|
} |
168 |
|
|
|