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b57f37fb WP |
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
23 | * USA | |
24 | * | |
25 | * $Id: devpoll.c 25038 2008-01-23 16:03:08Z androsyn $ | |
26 | */ | |
27 | #include <libratbox_config.h> | |
28 | #include <ratbox_lib.h> | |
29 | #include <commio-int.h> | |
30 | #include <fcntl.h> | |
31 | ||
32 | #if defined(HAVE_DEVPOLL) && (HAVE_DEVPOLL_H) | |
33 | #include <sys/devpoll.h> | |
34 | ||
35 | ||
36 | static void devpoll_update_events(int, short, PF *); | |
37 | static int dpfd; | |
38 | static int maxfd; | |
39 | static short *fdmask; | |
40 | static void devpoll_update_events(int, short, PF *); | |
41 | static void devpoll_write_update(int, int); | |
42 | ||
43 | ||
44 | int | |
45 | rb_setup_fd_devpoll(rb_fde_t *F) | |
46 | { | |
47 | return 0; | |
48 | } | |
49 | ||
50 | ||
51 | /* | |
52 | * Write an update to the devpoll filter. | |
53 | * See, we end up having to do a seperate (?) remove before we do an | |
54 | * add of a new polltype, so we have to have this function seperate from | |
55 | * the others. | |
56 | */ | |
57 | static void | |
58 | devpoll_write_update(int fd, int events) | |
59 | { | |
60 | struct pollfd pollfds[1]; /* Just to be careful */ | |
61 | int retval; | |
62 | ||
63 | /* Build the pollfd entry */ | |
64 | pollfds[0].revents = 0; | |
65 | pollfds[0].fd = fd; | |
66 | pollfds[0].events = events; | |
67 | ||
68 | /* Write the thing to our poll fd */ | |
69 | retval = write(dpfd, &pollfds[0], sizeof(struct pollfd)); | |
70 | if(retval != sizeof(struct pollfd)) | |
71 | rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno, strerror(errno)); | |
72 | /* Done! */ | |
73 | } | |
74 | ||
75 | static void | |
76 | devpoll_update_events(int fd, short filter, PF * handler) | |
77 | { | |
78 | int update_required = 0; | |
79 | int cur_mask = fdmask[fd]; | |
80 | PF *cur_handler; | |
81 | ||
82 | fdmask[fd] = 0; | |
83 | switch (filter) | |
84 | { | |
85 | case RB_SELECT_READ: | |
86 | cur_handler = F->read_handler; | |
87 | if(handler) | |
88 | fdmask[fd] |= POLLRDNORM; | |
89 | else | |
90 | fdmask[fd] &= ~POLLRDNORM; | |
91 | if(F->write_handler) | |
92 | fdmask[fd] |= POLLWRNORM; | |
93 | break; | |
94 | case RB_SELECT_WRITE: | |
95 | cur_handler = F->write_handler; | |
96 | if(handler) | |
97 | fdmask[fd] |= POLLWRNORM; | |
98 | else | |
99 | fdmask[fd] &= ~POLLWRNORM; | |
100 | if(F->read_handler) | |
101 | fdmask[fd] |= POLLRDNORM; | |
102 | break; | |
103 | default: | |
104 | return; | |
105 | break; | |
106 | } | |
107 | ||
108 | if(cur_handler == NULL && handler != NULL) | |
109 | update_required++; | |
110 | else if(cur_handler != NULL && handler == NULL) | |
111 | update_required++; | |
112 | if(cur_mask != fdmask[fd]) | |
113 | update_required++; | |
114 | if(update_required) | |
115 | { | |
116 | /* | |
117 | * Ok, we can call devpoll_write_update() here now to re-build the | |
118 | * fd struct. If we end up with nothing on this fd, it won't write | |
119 | * anything. | |
120 | */ | |
121 | if(fdmask[fd]) | |
122 | { | |
123 | devpoll_write_update(fd, POLLREMOVE); | |
124 | devpoll_write_update(fd, fdmask[fd]); | |
125 | } | |
126 | else | |
127 | devpoll_write_update(fd, POLLREMOVE); | |
128 | } | |
129 | } | |
130 | ||
131 | ||
132 | ||
133 | ||
134 | ||
135 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
136 | /* Public functions */ | |
137 | ||
138 | ||
139 | /* | |
140 | * rb_init_netio | |
141 | * | |
142 | * This is a needed exported function which will be called to initialise | |
143 | * the network loop code. | |
144 | */ | |
145 | int | |
146 | rb_init_netio_devpoll(void) | |
147 | { | |
148 | dpfd = open("/dev/poll", O_RDWR); | |
149 | if(dpfd < 0) | |
150 | { | |
151 | return errno; | |
152 | } | |
153 | maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */ | |
154 | fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1); | |
155 | rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor"); | |
156 | } | |
157 | ||
158 | /* | |
159 | * rb_setselect | |
160 | * | |
161 | * This is a needed exported function which will be called to register | |
162 | * and deregister interest in a pending IO state for a given FD. | |
163 | */ | |
164 | void | |
165 | rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, | |
166 | void *client_data) | |
167 | { | |
168 | lrb_assert(IsFDOpen(F)); | |
169 | ||
170 | if(type & RB_SELECT_READ) | |
171 | { | |
172 | devpoll_update_events(fd, RB_SELECT_READ, handler); | |
173 | F->read_handler = handler; | |
174 | F->read_data = client_data; | |
175 | } | |
176 | if(type & RB_SELECT_WRITE) | |
177 | { | |
178 | devpoll_update_events(fd, RB_SELECT_WRITE, handler); | |
179 | F->write_handler = handler; | |
180 | F->write_data = client_data; | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Check all connections for new connections and input data that is to be | |
186 | * processed. Also check for connections with data queued and whether we can | |
187 | * write it out. | |
188 | */ | |
189 | ||
190 | /* | |
191 | * rb_select | |
192 | * | |
193 | * Called to do the new-style IO, courtesy of squid (like most of this | |
194 | * new IO code). This routine handles the stuff we've hidden in | |
195 | * rb_setselect and fd_table[] and calls callbacks for IO ready | |
196 | * events. | |
197 | */ | |
198 | ||
199 | int | |
200 | rb_select_devpoll(long delay) | |
201 | { | |
202 | int num, i; | |
203 | struct pollfd pollfds[maxfd]; | |
204 | struct dvpoll dopoll; | |
205 | ||
206 | do | |
207 | { | |
208 | for (;;) | |
209 | { | |
210 | dopoll.dp_timeout = delay; | |
211 | dopoll.dp_nfds = maxfd; | |
212 | dopoll.dp_fds = &pollfds[0]; | |
213 | num = ioctl(dpfd, DP_POLL, &dopoll); | |
214 | if(num >= 0) | |
215 | break; | |
216 | if(rb_ignore_errno(errno)) | |
217 | break; | |
218 | rb_set_time(); | |
219 | return RB_ERROR; | |
220 | } | |
221 | ||
222 | rb_set_time(); | |
223 | if(num == 0) | |
224 | continue; | |
225 | ||
226 | for (i = 0; i < num; i++) | |
227 | { | |
228 | int fd = dopoll.dp_fds[i].fd; | |
229 | PF *hdl = NULL; | |
230 | rb_fde_t *F = rb_find_fd(fd); | |
231 | if((dopoll.dp_fds[i]. | |
232 | revents & (POLLRDNORM | POLLIN | POLLHUP | | |
233 | POLLERR)) | |
234 | && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) | |
235 | { | |
236 | if((hdl = F->read_handler) != NULL) | |
237 | { | |
238 | F->read_handler = NULL; | |
239 | hdl(F, F->read_data); | |
240 | /* | |
241 | * this call used to be with a NULL pointer, BUT | |
242 | * in the devpoll case we only want to update the | |
243 | * poll set *if* the handler changes state (active -> | |
244 | * NULL or vice versa.) | |
245 | */ | |
246 | devpoll_update_events(fd, | |
247 | RB_SELECT_READ, F->read_handler); | |
248 | } | |
249 | } | |
250 | ||
251 | if(!IsFDOpen(F)) | |
252 | continue; /* Read handler closed us..go on to do something more useful */ | |
253 | if((dopoll.dp_fds[i]. | |
254 | revents & (POLLWRNORM | POLLOUT | POLLHUP | | |
255 | POLLERR)) | |
256 | && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) | |
257 | { | |
258 | if((hdl = F->write_handler) != NULL) | |
259 | { | |
260 | F->write_handler = NULL; | |
261 | hdl(F, F->write_data); | |
262 | /* See above similar code in the read case */ | |
263 | devpoll_update_events(fd, | |
264 | RB_SELECT_WRITE, F->write_handler); | |
265 | } | |
266 | ||
267 | } | |
268 | } | |
269 | return RB_OK; | |
270 | } | |
271 | while (0); | |
272 | /* XXX Get here, we broke! */ | |
273 | return 0; | |
274 | } | |
275 | ||
276 | #else /* /dev/poll not supported */ | |
277 | int | |
278 | rb_init_netio_devpoll(void) | |
279 | { | |
280 | return ENOSYS; | |
281 | } | |
282 | ||
283 | void | |
284 | rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) | |
285 | { | |
286 | errno = ENOSYS; | |
287 | return; | |
288 | } | |
289 | ||
290 | int | |
291 | rb_select_devpoll(long delay) | |
292 | { | |
293 | errno = ENOSYS; | |
294 | return -1; | |
295 | } | |
296 | ||
297 | int | |
298 | rb_setup_fd_devpoll(rb_fde_t *F) | |
299 | { | |
300 | errno = ENOSYS; | |
301 | return -1; | |
302 | } | |
303 | #endif | |
304 |