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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 | * | |
25 | * $Id: devpoll.c 3229 2007-03-05 17:23:07Z nenolod $ | |
26 | */ | |
27 | ||
28 | #include "config.h" | |
29 | ||
30 | #include "stdinc.h" | |
31 | #include <sys/devpoll.h> | |
32 | ||
33 | #include "libcharybdis.h" | |
34 | ||
35 | #define POLL_LENGTH HARD_FDLIMIT | |
36 | ||
37 | ||
38 | static void devpoll_update_events(int, short, PF *); | |
39 | static int dpfd; | |
40 | static short fdmask[POLL_LENGTH]; | |
41 | static void devpoll_update_events(int, short, PF *); | |
42 | static void devpoll_write_update(int, int); | |
43 | ||
44 | /* #define NOTYET 1 */ | |
45 | ||
46 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
47 | /* Private functions */ | |
48 | ||
49 | /* | |
50 | * Write an update to the devpoll filter. | |
51 | * See, we end up having to do a seperate (?) remove before we do an | |
52 | * add of a new polltype, so we have to have this function seperate from | |
53 | * the others. | |
54 | */ | |
55 | static void | |
56 | devpoll_write_update(int fd, int events) | |
57 | { | |
58 | struct pollfd pollfds[1]; /* Just to be careful */ | |
59 | int retval; | |
60 | ||
61 | /* Build the pollfd entry */ | |
62 | pollfds[0].revents = 0; | |
63 | pollfds[0].fd = fd; | |
64 | pollfds[0].events = events; | |
65 | ||
66 | /* Write the thing to our poll fd */ | |
67 | retval = write(dpfd, &pollfds[0], sizeof(struct pollfd)); | |
68 | if(retval != sizeof(struct pollfd)) | |
69 | libcharybdis_log("devpoll_write_update: dpfd write failed %d: %s", errno, strerror(errno)); | |
70 | /* Done! */ | |
71 | } | |
72 | ||
73 | void | |
74 | devpoll_update_events(int fd, short filter, PF * handler) | |
75 | { | |
76 | int update_required = 0; | |
77 | int cur_mask = fdmask[fd]; | |
78 | PF *cur_handler; | |
79 | fdmask[fd] = 0; | |
80 | fde_t *F = comm_locate_fd(fd); | |
81 | ||
82 | switch (filter) | |
83 | { | |
84 | case COMM_SELECT_READ: | |
85 | cur_handler = F->read_handler; | |
86 | if(handler) | |
87 | fdmask[fd] |= POLLRDNORM; | |
88 | else | |
89 | fdmask[fd] &= ~POLLRDNORM; | |
90 | if(F->write_handler) | |
91 | fdmask[fd] |= POLLWRNORM; | |
92 | break; | |
93 | case COMM_SELECT_WRITE: | |
94 | cur_handler = F->write_handler; | |
95 | if(handler) | |
96 | fdmask[fd] |= POLLWRNORM; | |
97 | else | |
98 | fdmask[fd] &= ~POLLWRNORM; | |
99 | if(F->read_handler) | |
100 | fdmask[fd] |= POLLRDNORM; | |
101 | break; | |
102 | default: | |
103 | #ifdef NOTYET | |
104 | libcharybdis_log("devpoll_update_events called with unknown filter: %hd", filter); | |
105 | #endif | |
106 | return; | |
107 | break; | |
108 | } | |
109 | ||
110 | if(cur_handler == NULL && handler != NULL) | |
111 | update_required++; | |
112 | else if(cur_handler != NULL && handler == NULL) | |
113 | update_required++; | |
114 | if(cur_mask != fdmask[fd]) | |
115 | update_required++; | |
116 | if(update_required) | |
117 | { | |
118 | /* | |
119 | * Ok, we can call devpoll_write_update() here now to re-build the | |
120 | * fd struct. If we end up with nothing on this fd, it won't write | |
121 | * anything. | |
122 | */ | |
123 | if(fdmask[fd]) | |
124 | { | |
125 | devpoll_write_update(fd, POLLREMOVE); | |
126 | devpoll_write_update(fd, fdmask[fd]); | |
127 | } | |
128 | else | |
129 | devpoll_write_update(fd, POLLREMOVE); | |
130 | } | |
131 | } | |
132 | ||
133 | ||
134 | ||
135 | ||
136 | ||
137 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
138 | /* Public functions */ | |
139 | ||
140 | ||
141 | /* | |
142 | * init_netio | |
143 | * | |
144 | * This is a needed exported function which will be called to initialise | |
145 | * the network loop code. | |
146 | */ | |
147 | void | |
148 | init_netio(void) | |
149 | { | |
150 | memset(&fdmask, 0, sizeof(fdmask)); | |
151 | dpfd = open("/dev/poll", O_RDWR); | |
152 | if(dpfd < 0) | |
153 | { | |
154 | fprintf(stderr, | |
155 | "init_netio: Couldn't open /dev/poll - %d: %s\n", | |
156 | errno, strerror(errno)); | |
157 | exit(115); /* Whee! */ | |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
162 | * comm_setselect | |
163 | * | |
164 | * This is a needed exported function which will be called to register | |
165 | * and deregister interest in a pending IO state for a given FD. | |
166 | */ | |
167 | void | |
168 | comm_setselect(int fd, fdlist_t list, unsigned int type, PF * handler, | |
169 | void *client_data, time_t timeout) | |
170 | { | |
171 | fde_t *F = comm_locate_fd(fd); | |
172 | s_assert(fd >= 0); | |
173 | s_assert(F->flags.open); | |
174 | ||
175 | /* Update the list, even though we're not using it .. */ | |
176 | F->list = list; | |
177 | ||
178 | if(type & COMM_SELECT_READ) | |
179 | { | |
180 | devpoll_update_events(fd, COMM_SELECT_READ, handler); | |
181 | F->read_handler = handler; | |
182 | F->read_data = client_data; | |
183 | } | |
184 | if(type & COMM_SELECT_WRITE) | |
185 | { | |
186 | devpoll_update_events(fd, COMM_SELECT_WRITE, handler); | |
187 | F->write_handler = handler; | |
188 | F->write_data = client_data; | |
189 | } | |
190 | if(timeout) | |
191 | F->timeout = CurrentTime + (timeout / 1000); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Check all connections for new connections and input data that is to be | |
196 | * processed. Also check for connections with data queued and whether we can | |
197 | * write it out. | |
198 | */ | |
199 | ||
200 | /* | |
201 | * comm_select | |
202 | * | |
203 | * Called to do the new-style IO, courtesy of squid (like most of this | |
204 | * new IO code). This routine handles the stuff we've hidden in | |
205 | * comm_setselect and fd_table[] and calls callbacks for IO ready | |
206 | * events. | |
207 | */ | |
208 | ||
209 | int | |
210 | comm_select(unsigned long delay) | |
211 | { | |
212 | int num, i; | |
213 | struct pollfd pollfds[POLL_LENGTH]; | |
214 | struct dvpoll dopoll; | |
215 | ||
216 | do | |
217 | { | |
218 | for (;;) | |
219 | { | |
220 | dopoll.dp_timeout = delay; | |
221 | dopoll.dp_nfds = POLL_LENGTH; | |
222 | dopoll.dp_fds = &pollfds[0]; | |
223 | num = ioctl(dpfd, DP_POLL, &dopoll); | |
224 | if(num >= 0) | |
225 | break; | |
226 | if(ignoreErrno(errno)) | |
227 | break; | |
228 | set_time(); | |
229 | return COMM_ERROR; | |
230 | } | |
231 | ||
232 | set_time(); | |
233 | if(num == 0) | |
234 | continue; | |
235 | ||
236 | for (i = 0; i < num; i++) | |
237 | { | |
238 | int fd = dopoll.dp_fds[i].fd; | |
239 | PF *hdl = NULL; | |
240 | fde_t *F = comm_locate_fd(fd); | |
241 | if((dopoll.dp_fds[i]. | |
242 | revents & (POLLRDNORM | POLLIN | POLLHUP | | |
243 | POLLERR)) | |
244 | && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) | |
245 | { | |
246 | if((hdl = F->read_handler) != NULL) | |
247 | { | |
248 | F->read_handler = NULL; | |
249 | hdl(fd, F->read_data); | |
250 | /* | |
251 | * this call used to be with a NULL pointer, BUT | |
252 | * in the devpoll case we only want to update the | |
253 | * poll set *if* the handler changes state (active -> | |
254 | * NULL or vice versa.) | |
255 | */ | |
256 | devpoll_update_events(fd, | |
257 | COMM_SELECT_READ, F->read_handler); | |
258 | } | |
259 | else | |
260 | libcharybdis_log("comm_select: Unhandled read event: fdmask: %x", | |
261 | fdmask[fd]); | |
262 | } | |
263 | ||
264 | if(F->flags.open == 0) | |
265 | continue; /* Read handler closed us..go on to do something more useful */ | |
266 | if((dopoll.dp_fds[i]. | |
267 | revents & (POLLWRNORM | POLLOUT | POLLHUP | | |
268 | POLLERR)) | |
269 | && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) | |
270 | { | |
271 | if((hdl = F->write_handler) != NULL) | |
272 | { | |
273 | F->write_handler = NULL; | |
274 | hdl(fd, F->write_data); | |
275 | /* See above similar code in the read case */ | |
276 | devpoll_update_events(fd, | |
277 | COMM_SELECT_WRITE, F->write_handler); | |
278 | } | |
279 | else | |
280 | libcharybdis_log("comm_select: Unhandled write event: fdmask: %x", | |
281 | fdmask[fd]); | |
282 | ||
283 | } | |
284 | if(dopoll.dp_fds[i].revents & POLLNVAL) | |
285 | { | |
286 | libcharybdis_log("revents was Invalid for %d", fd); | |
287 | } | |
288 | } | |
289 | return COMM_OK; | |
290 | } | |
291 | while (0); | |
292 | /* XXX Get here, we broke! */ | |
293 | return 0; | |
294 | } | |
295 |