1 | |
|
|
2 | /* |
1 | /* |
3 | * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> |
2 | * Copyright 2007 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu> |
3 | * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu> |
5 | * All rights reserved. |
4 | * All rights reserved. |
6 | * |
5 | * |
… | |
… | |
33 | #include <sys/queue.h> |
32 | #include <sys/queue.h> |
34 | #include <sys/event.h> |
33 | #include <sys/event.h> |
35 | #include <string.h> |
34 | #include <string.h> |
36 | #include <errno.h> |
35 | #include <errno.h> |
37 | |
36 | |
38 | static int kq_fd; |
|
|
39 | static struct kevent *kq_changes; |
|
|
40 | static int kq_changemax, kq_changecnt; |
|
|
41 | static struct kevent *kq_events; |
|
|
42 | static int kq_eventmax; |
|
|
43 | |
|
|
44 | static void |
37 | static void |
45 | kqueue_change (int fd, int filter, int flags, int fflags) |
38 | kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) |
46 | { |
39 | { |
47 | struct kevent *ke; |
40 | struct kevent *ke; |
48 | |
41 | |
49 | array_needsize (kq_changes, kq_changemax, ++kq_changecnt, ); |
42 | array_needsize (kqueue_changes, kqueue_changemax, ++kqueue_changecnt, ); |
50 | |
43 | |
51 | ke = &kq_changes [kq_changecnt - 1]; |
44 | ke = &kqueue_changes [kqueue_changecnt - 1]; |
52 | memset (ke, 0, sizeof (struct kevent)); |
45 | memset (ke, 0, sizeof (struct kevent)); |
53 | ke->ident = fd; |
46 | ke->ident = fd; |
54 | ke->filter = filter; |
47 | ke->filter = filter; |
55 | ke->flags = flags; |
48 | ke->flags = flags; |
56 | ke->fflags = fflags; |
49 | ke->fflags = fflags; |
57 | } |
50 | } |
58 | |
51 | |
|
|
52 | #ifndef NOTE_EOF |
|
|
53 | # define NOTE_EOF 0 |
|
|
54 | #endif |
|
|
55 | |
59 | static void |
56 | static void |
60 | kqueue_modify (int fd, int oev, int nev) |
57 | kqueue_modify (EV_P_ int fd, int oev, int nev) |
61 | { |
58 | { |
62 | if ((oev ^ new) & EV_READ) |
59 | if ((oev ^ nev) & EV_READ) |
63 | { |
60 | { |
64 | if (nev & EV_READ) |
61 | if (nev & EV_READ) |
65 | kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF); |
62 | kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF); |
66 | else |
63 | else |
67 | kqueue_change (fd, EVFILT_READ, EV_DELETE, 0); |
64 | kqueue_change (fd, EVFILT_READ, EV_DELETE, 0); |
68 | } |
65 | } |
69 | |
66 | |
70 | if ((oev ^ new) & EV_WRITE) |
67 | if ((oev ^ nev) & EV_WRITE) |
71 | { |
68 | { |
72 | if (nev & EV_WRITE) |
69 | if (nev & EV_WRITE) |
73 | kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); |
70 | kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); |
74 | else |
71 | else |
75 | kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0); |
72 | kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0); |
76 | } |
73 | } |
77 | } |
74 | } |
78 | |
75 | |
79 | static void |
76 | static void |
80 | kqueue_poll (ev_tstamp timeout) |
77 | kqueue_poll (EV_P_ ev_tstamp timeout) |
81 | { |
78 | { |
82 | int res, i; |
79 | int res, i; |
83 | struct timespec ts; |
80 | struct timespec ts; |
84 | |
81 | |
85 | ts.tv_sec = (time_t)timeout; |
82 | ts.tv_sec = (time_t)timeout; |
86 | ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; |
83 | ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; |
87 | res = kevent (kq_fd, kq_changes, kq_changecnt, kq_events, kq_eventmax, &ts); |
84 | res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); |
88 | kq_changecnt = 0; |
85 | kqueue_changecnt = 0; |
89 | |
86 | |
90 | if (res < 0) |
87 | if (res < 0) |
91 | return; |
88 | return; |
92 | |
89 | |
93 | for (i = 0; i < res; ++i) |
90 | for (i = 0; i < res; ++i) |
94 | { |
91 | { |
95 | if (kq_events [i].flags & EV_ERROR) |
92 | if (kqueue_events [i].flags & EV_ERROR) |
96 | { |
93 | { |
97 | /* |
94 | /* |
98 | * Error messages that can happen, when a delete fails. |
95 | * Error messages that can happen, when a delete fails. |
99 | * EBADF happens when the file discriptor has been |
96 | * EBADF happens when the file discriptor has been |
100 | * closed, |
97 | * closed, |
… | |
… | |
104 | * should not be returned ever; but FreeBSD does :-\ |
101 | * should not be returned ever; but FreeBSD does :-\ |
105 | * An error is also indicated when a callback deletes |
102 | * An error is also indicated when a callback deletes |
106 | * an event we are still processing. In that case |
103 | * an event we are still processing. In that case |
107 | * the data field is set to ENOENT. |
104 | * the data field is set to ENOENT. |
108 | */ |
105 | */ |
109 | if (events [i].data == EBADF) |
106 | if (kqueue_events [i].data == EBADF) |
110 | fd_kill (events [i].ident); |
107 | fd_kill (EV_A_ kqueue_events [i].ident); |
111 | } |
108 | } |
112 | else |
109 | else |
113 | event ( |
110 | fd_event ( |
|
|
111 | EV_A_ |
114 | events [i].ident, |
112 | kqueue_events [i].ident, |
115 | events [i].filter == EVFILT_READ ? EV_READ |
113 | kqueue_events [i].filter == EVFILT_READ ? EV_READ |
116 | : events [i].filter == EVFILT_WRITE ? EV_WRITE |
114 | : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE |
117 | : 0 |
115 | : 0 |
118 | ); |
116 | ); |
119 | } |
117 | } |
120 | |
118 | |
121 | if (expect_false (res == kq_eventmax)) |
119 | if (expect_false (res == kqueue_eventmax)) |
122 | { |
120 | { |
123 | free (kq_events); |
121 | free (kqueue_events); |
124 | kq_eventmax = array_roundsize (kq_events, kq_eventmax << 1); |
122 | kqueue_eventmax = array_roundsize (kqueue_events, kqueue_eventmax << 1); |
125 | kq_events = malloc (sizeof (struct kevent) * kq_eventmax); |
123 | kqueue_events = malloc (sizeof (struct kevent) * kqueue_eventmax); |
126 | } |
124 | } |
127 | } |
125 | } |
128 | |
126 | |
129 | static void |
127 | static int |
130 | kqueue_init (struct event_base *base) |
128 | kqueue_init (EV_P_ int flags) |
131 | { |
129 | { |
132 | struct kevent ch, ev; |
130 | struct kevent ch, ev; |
133 | |
131 | |
134 | /* Initalize the kernel queue */ |
132 | /* Initalize the kernel queue */ |
135 | if ((kq_fd = kqueue ()) < 0) |
133 | if ((kqueue_fd = kqueue ()) < 0) |
136 | return; |
134 | return 0; |
|
|
135 | |
|
|
136 | fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
137 | |
137 | |
138 | /* Check for Mac OS X kqueue bug. */ |
138 | /* Check for Mac OS X kqueue bug. */ |
139 | ch.ident = -1; |
139 | ch.ident = -1; |
140 | ch.filter = EVFILT_READ; |
140 | ch.filter = EVFILT_READ; |
141 | ch.flags = EV_ADD; |
141 | ch.flags = EV_ADD; |
142 | |
142 | |
143 | /* |
143 | /* |
144 | * If kqueue works, then kevent will succeed, and it will |
144 | * If kqueue works, then kevent will succeed, and it will |
145 | * stick an error in events[0]. If kqueue is broken, then |
145 | * stick an error in ev. If kqueue is broken, then |
146 | * kevent will fail. |
146 | * kevent will fail. |
147 | */ |
147 | */ |
148 | if (kevent (kq_fd, &ch, 1, &ev, 1, 0) != 1 |
148 | if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1 |
149 | || ev.ident != -1 |
149 | || ev.ident != -1 |
150 | || ev.flags != EV_ERROR) |
150 | || ev.flags != EV_ERROR) |
151 | { |
151 | { |
152 | /* detected broken kqueue */ |
152 | /* detected broken kqueue */ |
153 | close (kq_fd); |
153 | close (kqueue_fd); |
154 | return; |
154 | return 0; |
155 | } |
155 | } |
156 | |
156 | |
157 | ev_method = EVMETHOD_KQUEUE; |
|
|
158 | method_fudge = 1e-3; /* needed to compensate for kevent returning early */ |
157 | method_fudge = 1e-3; /* needed to compensate for kevent returning early */ |
159 | method_modify = kq_modify; |
158 | method_modify = kqueue_modify; |
160 | method_poll = kq_poll; |
159 | method_poll = kqueue_poll; |
161 | |
160 | |
162 | kq_eventmax = 64; /* intiial number of events receivable per poll */ |
161 | kqueue_eventmax = 64; /* intiial number of events receivable per poll */ |
163 | kq_events = malloc (sizeof (struct kevent) * kq_eventmax); |
162 | kqueue_events = malloc (sizeof (struct kevent) * kqueue_eventmax); |
|
|
163 | |
|
|
164 | kqueue_changes = 0; |
|
|
165 | kqueue_changemax = 0; |
|
|
166 | kqueue_changecnt = 0; |
|
|
167 | |
|
|
168 | return EVMETHOD_KQUEUE; |
164 | } |
169 | } |
165 | |
170 | |
|
|
171 | static void |
|
|
172 | kqueue_destroy (EV_P) |
|
|
173 | { |
|
|
174 | close (kqueue_fd); |
|
|
175 | |
|
|
176 | free (kqueue_events); |
|
|
177 | free (kqueue_changes); |
|
|
178 | } |
|
|
179 | |
|
|
180 | static void |
|
|
181 | kqueue_fork (EV_P) |
|
|
182 | { |
|
|
183 | kqueue_fd = kqueue (); |
|
|
184 | fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); |
|
|
185 | |
|
|
186 | /* re-register interest in fds */ |
|
|
187 | fd_rearm_all (); |
|
|
188 | } |
|
|
189 | |