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212380e3 | 1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * s_bsd_devpoll.c: /dev/poll compatible network routines. | |
4 | * | |
5 | * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center | |
6 | * Copyright (C) 1996-2002 Hybrid Development Team | |
7 | * Copyright (C) 2001 Adrian Chadd <adrian@creative.net.au> | |
8 | * Copyright (C) 2002-2005 ircd-ratbox development team | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
23 | * USA | |
24 | * | |
6fcb8629 | 25 | * $Id: devpoll.c 3354 2007-04-03 09:21:31Z nenolod $ |
212380e3 | 26 | */ |
27 | ||
28 | #include "config.h" | |
29 | ||
30 | #include "stdinc.h" | |
31 | #include <sys/devpoll.h> | |
32 | ||
33 | #include "libcharybdis.h" | |
34 | ||
6fcb8629 | 35 | #define POLL_LENGTH 1024 |
212380e3 | 36 | |
37 | static void devpoll_update_events(int, short, PF *); | |
38 | static int dpfd; | |
39 | static short fdmask[POLL_LENGTH]; | |
40 | static void devpoll_update_events(int, short, PF *); | |
41 | static void devpoll_write_update(int, int); | |
42 | ||
43 | /* #define NOTYET 1 */ | |
44 | ||
45 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
46 | /* Private functions */ | |
47 | ||
48 | /* | |
49 | * Write an update to the devpoll filter. | |
50 | * See, we end up having to do a seperate (?) remove before we do an | |
51 | * add of a new polltype, so we have to have this function seperate from | |
52 | * the others. | |
53 | */ | |
54 | static void | |
55 | devpoll_write_update(int fd, int events) | |
56 | { | |
57 | struct pollfd pollfds[1]; /* Just to be careful */ | |
58 | int retval; | |
59 | ||
60 | /* Build the pollfd entry */ | |
61 | pollfds[0].revents = 0; | |
62 | pollfds[0].fd = fd; | |
63 | pollfds[0].events = events; | |
64 | ||
65 | /* Write the thing to our poll fd */ | |
66 | retval = write(dpfd, &pollfds[0], sizeof(struct pollfd)); | |
67 | if(retval != sizeof(struct pollfd)) | |
68 | libcharybdis_log("devpoll_write_update: dpfd write failed %d: %s", errno, strerror(errno)); | |
69 | /* Done! */ | |
70 | } | |
71 | ||
72 | void | |
73 | devpoll_update_events(int fd, short filter, PF * handler) | |
74 | { | |
75 | int update_required = 0; | |
76 | int cur_mask = fdmask[fd]; | |
77 | PF *cur_handler; | |
78 | fdmask[fd] = 0; | |
e70f8e92 | 79 | fde_t *F = comm_locate_fd(fd); |
80 | ||
212380e3 | 81 | switch (filter) |
82 | { | |
83 | case COMM_SELECT_READ: | |
e70f8e92 | 84 | cur_handler = F->read_handler; |
212380e3 | 85 | if(handler) |
86 | fdmask[fd] |= POLLRDNORM; | |
87 | else | |
88 | fdmask[fd] &= ~POLLRDNORM; | |
e70f8e92 | 89 | if(F->write_handler) |
212380e3 | 90 | fdmask[fd] |= POLLWRNORM; |
91 | break; | |
92 | case COMM_SELECT_WRITE: | |
e70f8e92 | 93 | cur_handler = F->write_handler; |
212380e3 | 94 | if(handler) |
95 | fdmask[fd] |= POLLWRNORM; | |
96 | else | |
97 | fdmask[fd] &= ~POLLWRNORM; | |
e70f8e92 | 98 | if(F->read_handler) |
212380e3 | 99 | fdmask[fd] |= POLLRDNORM; |
100 | break; | |
101 | default: | |
102 | #ifdef NOTYET | |
103 | libcharybdis_log("devpoll_update_events called with unknown filter: %hd", filter); | |
104 | #endif | |
105 | return; | |
106 | break; | |
107 | } | |
108 | ||
109 | if(cur_handler == NULL && handler != NULL) | |
110 | update_required++; | |
111 | else if(cur_handler != NULL && handler == NULL) | |
112 | update_required++; | |
113 | if(cur_mask != fdmask[fd]) | |
114 | update_required++; | |
115 | if(update_required) | |
116 | { | |
117 | /* | |
118 | * Ok, we can call devpoll_write_update() here now to re-build the | |
119 | * fd struct. If we end up with nothing on this fd, it won't write | |
120 | * anything. | |
121 | */ | |
122 | if(fdmask[fd]) | |
123 | { | |
124 | devpoll_write_update(fd, POLLREMOVE); | |
125 | devpoll_write_update(fd, fdmask[fd]); | |
126 | } | |
127 | else | |
128 | devpoll_write_update(fd, POLLREMOVE); | |
129 | } | |
130 | } | |
131 | ||
132 | ||
133 | ||
134 | ||
135 | ||
136 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
137 | /* Public functions */ | |
138 | ||
139 | ||
140 | /* | |
141 | * init_netio | |
142 | * | |
143 | * This is a needed exported function which will be called to initialise | |
144 | * the network loop code. | |
145 | */ | |
146 | void | |
147 | init_netio(void) | |
148 | { | |
149 | memset(&fdmask, 0, sizeof(fdmask)); | |
150 | dpfd = open("/dev/poll", O_RDWR); | |
151 | if(dpfd < 0) | |
152 | { | |
153 | fprintf(stderr, | |
154 | "init_netio: Couldn't open /dev/poll - %d: %s\n", | |
155 | errno, strerror(errno)); | |
156 | exit(115); /* Whee! */ | |
157 | } | |
158 | } | |
159 | ||
160 | /* | |
161 | * comm_setselect | |
162 | * | |
163 | * This is a needed exported function which will be called to register | |
164 | * and deregister interest in a pending IO state for a given FD. | |
165 | */ | |
166 | void | |
167 | comm_setselect(int fd, fdlist_t list, unsigned int type, PF * handler, | |
168 | void *client_data, time_t timeout) | |
169 | { | |
e70f8e92 | 170 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 171 | s_assert(fd >= 0); |
172 | s_assert(F->flags.open); | |
173 | ||
174 | /* Update the list, even though we're not using it .. */ | |
175 | F->list = list; | |
176 | ||
177 | if(type & COMM_SELECT_READ) | |
178 | { | |
179 | devpoll_update_events(fd, COMM_SELECT_READ, handler); | |
180 | F->read_handler = handler; | |
181 | F->read_data = client_data; | |
182 | } | |
183 | if(type & COMM_SELECT_WRITE) | |
184 | { | |
185 | devpoll_update_events(fd, COMM_SELECT_WRITE, handler); | |
186 | F->write_handler = handler; | |
187 | F->write_data = client_data; | |
188 | } | |
189 | if(timeout) | |
190 | F->timeout = CurrentTime + (timeout / 1000); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Check all connections for new connections and input data that is to be | |
195 | * processed. Also check for connections with data queued and whether we can | |
196 | * write it out. | |
197 | */ | |
198 | ||
199 | /* | |
200 | * comm_select | |
201 | * | |
202 | * Called to do the new-style IO, courtesy of squid (like most of this | |
203 | * new IO code). This routine handles the stuff we've hidden in | |
204 | * comm_setselect and fd_table[] and calls callbacks for IO ready | |
205 | * events. | |
206 | */ | |
207 | ||
208 | int | |
209 | comm_select(unsigned long delay) | |
210 | { | |
211 | int num, i; | |
212 | struct pollfd pollfds[POLL_LENGTH]; | |
213 | struct dvpoll dopoll; | |
214 | ||
215 | do | |
216 | { | |
217 | for (;;) | |
218 | { | |
219 | dopoll.dp_timeout = delay; | |
220 | dopoll.dp_nfds = POLL_LENGTH; | |
221 | dopoll.dp_fds = &pollfds[0]; | |
222 | num = ioctl(dpfd, DP_POLL, &dopoll); | |
223 | if(num >= 0) | |
224 | break; | |
225 | if(ignoreErrno(errno)) | |
226 | break; | |
227 | set_time(); | |
228 | return COMM_ERROR; | |
229 | } | |
230 | ||
231 | set_time(); | |
232 | if(num == 0) | |
233 | continue; | |
234 | ||
235 | for (i = 0; i < num; i++) | |
236 | { | |
237 | int fd = dopoll.dp_fds[i].fd; | |
238 | PF *hdl = NULL; | |
e70f8e92 | 239 | fde_t *F = comm_locate_fd(fd); |
212380e3 | 240 | if((dopoll.dp_fds[i]. |
241 | revents & (POLLRDNORM | POLLIN | POLLHUP | | |
242 | POLLERR)) | |
243 | && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) | |
244 | { | |
245 | if((hdl = F->read_handler) != NULL) | |
246 | { | |
247 | F->read_handler = NULL; | |
248 | hdl(fd, F->read_data); | |
249 | /* | |
250 | * this call used to be with a NULL pointer, BUT | |
251 | * in the devpoll case we only want to update the | |
252 | * poll set *if* the handler changes state (active -> | |
253 | * NULL or vice versa.) | |
254 | */ | |
255 | devpoll_update_events(fd, | |
256 | COMM_SELECT_READ, F->read_handler); | |
257 | } | |
258 | else | |
259 | libcharybdis_log("comm_select: Unhandled read event: fdmask: %x", | |
260 | fdmask[fd]); | |
261 | } | |
262 | ||
263 | if(F->flags.open == 0) | |
264 | continue; /* Read handler closed us..go on to do something more useful */ | |
265 | if((dopoll.dp_fds[i]. | |
266 | revents & (POLLWRNORM | POLLOUT | POLLHUP | | |
267 | POLLERR)) | |
268 | && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) | |
269 | { | |
270 | if((hdl = F->write_handler) != NULL) | |
271 | { | |
272 | F->write_handler = NULL; | |
273 | hdl(fd, F->write_data); | |
274 | /* See above similar code in the read case */ | |
275 | devpoll_update_events(fd, | |
276 | COMM_SELECT_WRITE, F->write_handler); | |
277 | } | |
278 | else | |
279 | libcharybdis_log("comm_select: Unhandled write event: fdmask: %x", | |
280 | fdmask[fd]); | |
281 | ||
282 | } | |
283 | if(dopoll.dp_fds[i].revents & POLLNVAL) | |
284 | { | |
285 | libcharybdis_log("revents was Invalid for %d", fd); | |
286 | } | |
287 | } | |
288 | return COMM_OK; | |
289 | } | |
290 | while (0); | |
291 | /* XXX Get here, we broke! */ | |
292 | return 0; | |
293 | } | |
294 |