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1 | /* ioset kqueue()/kevent() backend for srvx | |
2 | * Copyright 2008 srvx Development Team | |
3 | * | |
4 | * This file is part of srvx. | |
5 | * | |
6 | * srvx is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with srvx; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
19 | */ | |
20 | ||
21 | #include "ioset-impl.h" | |
22 | #include "common.h" | |
23 | #include "log.h" | |
24 | ||
25 | #ifdef HAVE_SYS_EVENT_H | |
26 | # include <sys/event.h> | |
27 | #endif | |
28 | ||
29 | #define MAX_EVENTS 16 | |
30 | ||
31 | extern int clock_skew; | |
32 | static int kq_fd; | |
33 | ||
34 | static int | |
35 | ioset_kevent_init(void) | |
36 | { | |
37 | kq_fd = kqueue(); | |
38 | return kq_fd >= 0; | |
39 | } | |
40 | ||
41 | static void | |
42 | ioset_kevent_add(struct io_fd *fd) | |
43 | { | |
44 | struct kevent changes[2]; | |
45 | int nchanges = 0; | |
46 | int res; | |
47 | ||
48 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_READ, EV_ADD, 0, 0, fd); | |
49 | if (fd_wants_writes(fd)) { | |
50 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_WRITE, EV_ADD, 0, 0, fd); | |
51 | } | |
52 | res = kevent(kq_fd, changes, nchanges, NULL, 0, NULL); | |
53 | if (res < 0) { | |
54 | log_module(MAIN_LOG, LOG_ERROR, "kevent() add failed: %s", strerror(errno)); | |
55 | } | |
56 | } | |
57 | ||
58 | static void | |
59 | ioset_kevent_remove(struct io_fd *fd, int closed) | |
60 | { | |
61 | if (!closed) { | |
62 | struct kevent changes[2]; | |
63 | int nchanges = 0; | |
64 | int res; | |
65 | ||
66 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_READ, EV_DELETE, 0, 0, fd); | |
67 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_WRITE, EV_DELETE, 0, 0, fd); | |
68 | res = kevent(kq_fd, changes, nchanges, NULL, 0, NULL); | |
69 | if (res < 0) { | |
70 | log_module(MAIN_LOG, LOG_ERROR, "kevent() remove failed: %s", strerror(errno)); | |
71 | } | |
72 | } | |
73 | } | |
74 | ||
75 | static void | |
76 | ioset_kevent_update(struct io_fd *fd) | |
77 | { | |
78 | struct kevent changes[2]; | |
79 | int nchanges = 0; | |
80 | int res; | |
81 | ||
82 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_READ, EV_ADD, 0, 0, fd); | |
83 | EV_SET(&changes[nchanges++], fd->fd, EVFILT_WRITE, fd_wants_writes(fd) ? EV_ADD : EV_DELETE, 0, 0, fd); | |
84 | res = kevent(kq_fd, changes, nchanges, NULL, 0, NULL); | |
85 | if (res < 0) { | |
86 | log_module(MAIN_LOG, LOG_ERROR, "kevent() add failed: %s", strerror(errno)); | |
87 | } | |
88 | } | |
89 | ||
90 | static void | |
91 | ioset_kevent_cleanup(void) | |
92 | { | |
93 | close(kq_fd); | |
94 | } | |
95 | ||
96 | static int | |
97 | ioset_kevent_loop(struct timeval *timeout) | |
98 | { | |
99 | struct kevent events[MAX_EVENTS]; | |
100 | struct timespec ts; | |
101 | struct timespec *pts; | |
102 | int is_write; | |
103 | int is_read; | |
104 | int res; | |
105 | int ii; | |
106 | ||
107 | /* Try to get events from the kernel. */ | |
108 | if (timeout) { | |
109 | ts.tv_sec = timeout->tv_sec; | |
110 | ts.tv_nsec = timeout->tv_usec * 1000; | |
111 | pts = &ts; | |
112 | } else { | |
113 | pts = NULL; | |
114 | } | |
115 | res = kevent(kq_fd, NULL, 0, events, MAX_EVENTS, pts); | |
116 | if ((res < 0) && (errno != EINTR)) { | |
117 | log_module(MAIN_LOG, LOG_ERROR, "kevent() poll failed: %s", strerror(errno)); | |
118 | return 1; | |
119 | } | |
120 | now = time(NULL) + clock_skew; | |
121 | ||
122 | /* Process the events we got. */ | |
123 | for (ii = 0; ii < res; ++ii) { | |
124 | is_write = events[ii].filter == EVFILT_WRITE; | |
125 | is_read = events[ii].filter == EVFILT_READ; | |
126 | ioset_events(events[ii].udata, is_read, is_write); | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | struct io_engine io_engine_kevent = { | |
133 | .name = "kevent", | |
134 | .init = ioset_kevent_init, | |
135 | .add = ioset_kevent_add, | |
136 | .remove = ioset_kevent_remove, | |
137 | .update = ioset_kevent_update, | |
138 | .loop = ioset_kevent_loop, | |
139 | .cleanup = ioset_kevent_cleanup, | |
140 | }; |