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db137867 AC |
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 | * | |
db137867 | 25 | */ |
c056dba2 | 26 | |
fe037171 EM |
27 | #include <librb_config.h> |
28 | #include <rb_lib.h> | |
db137867 AC |
29 | #include <commio-int.h> |
30 | #include <fcntl.h> | |
31 | ||
030272f3 | 32 | #if defined(HAVE_DEVPOLL) && (HAVE_SYS_DEVPOLL_H) |
db137867 AC |
33 | #include <sys/devpoll.h> |
34 | ||
db137867 AC |
35 | static int dpfd; |
36 | static int maxfd; | |
37 | static short *fdmask; | |
030272f3 | 38 | static void devpoll_update_events(rb_fde_t *, short, PF *); |
db137867 AC |
39 | static void devpoll_write_update(int, int); |
40 | ||
41 | ||
3202e249 | 42 | int |
db137867 AC |
43 | rb_setup_fd_devpoll(rb_fde_t *F) |
44 | { | |
3202e249 | 45 | return 0; |
db137867 | 46 | } |
3202e249 VY |
47 | |
48 | ||
db137867 AC |
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)) | |
3202e249 VY |
69 | rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno, |
70 | strerror(errno)); | |
db137867 AC |
71 | /* Done! */ |
72 | } | |
73 | ||
74 | static void | |
030272f3 | 75 | devpoll_update_events(rb_fde_t *F, short filter, PF * handler) |
db137867 AC |
76 | { |
77 | int update_required = 0; | |
030272f3 | 78 | int fd = rb_get_fd(F); |
db137867 AC |
79 | int cur_mask = fdmask[fd]; |
80 | PF *cur_handler; | |
db137867 AC |
81 | fdmask[fd] = 0; |
82 | switch (filter) | |
83 | { | |
84 | case RB_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 RB_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 | return; | |
104 | break; | |
105 | } | |
106 | ||
107 | if(cur_handler == NULL && handler != NULL) | |
108 | update_required++; | |
109 | else if(cur_handler != NULL && handler == NULL) | |
110 | update_required++; | |
111 | if(cur_mask != fdmask[fd]) | |
112 | update_required++; | |
113 | if(update_required) | |
114 | { | |
115 | /* | |
116 | * Ok, we can call devpoll_write_update() here now to re-build the | |
117 | * fd struct. If we end up with nothing on this fd, it won't write | |
118 | * anything. | |
119 | */ | |
120 | if(fdmask[fd]) | |
121 | { | |
122 | devpoll_write_update(fd, POLLREMOVE); | |
123 | devpoll_write_update(fd, fdmask[fd]); | |
124 | } | |
125 | else | |
126 | devpoll_write_update(fd, POLLREMOVE); | |
127 | } | |
128 | } | |
129 | ||
130 | ||
131 | ||
132 | ||
133 | ||
134 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
135 | /* Public functions */ | |
136 | ||
137 | ||
138 | /* | |
139 | * rb_init_netio | |
140 | * | |
141 | * This is a needed exported function which will be called to initialise | |
142 | * the network loop code. | |
143 | */ | |
144 | int | |
145 | rb_init_netio_devpoll(void) | |
146 | { | |
147 | dpfd = open("/dev/poll", O_RDWR); | |
148 | if(dpfd < 0) | |
149 | { | |
150 | return errno; | |
151 | } | |
3202e249 | 152 | maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */ |
db137867 AC |
153 | fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1); |
154 | rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor"); | |
030272f3 | 155 | return 0; |
db137867 AC |
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 | |
3202e249 | 165 | rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) |
db137867 AC |
166 | { |
167 | lrb_assert(IsFDOpen(F)); | |
168 | ||
169 | if(type & RB_SELECT_READ) | |
170 | { | |
030272f3 | 171 | devpoll_update_events(F, RB_SELECT_READ, handler); |
db137867 AC |
172 | F->read_handler = handler; |
173 | F->read_data = client_data; | |
174 | } | |
175 | if(type & RB_SELECT_WRITE) | |
176 | { | |
030272f3 | 177 | devpoll_update_events(F, RB_SELECT_WRITE, handler); |
db137867 AC |
178 | F->write_handler = handler; |
179 | F->write_data = client_data; | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * Check all connections for new connections and input data that is to be | |
185 | * processed. Also check for connections with data queued and whether we can | |
186 | * write it out. | |
187 | */ | |
188 | ||
189 | /* | |
190 | * rb_select | |
191 | * | |
192 | * Called to do the new-style IO, courtesy of squid (like most of this | |
193 | * new IO code). This routine handles the stuff we've hidden in | |
194 | * rb_setselect and fd_table[] and calls callbacks for IO ready | |
195 | * events. | |
196 | */ | |
197 | ||
198 | int | |
199 | rb_select_devpoll(long delay) | |
200 | { | |
201 | int num, i; | |
202 | struct pollfd pollfds[maxfd]; | |
203 | struct dvpoll dopoll; | |
204 | ||
205 | do | |
206 | { | |
3202e249 | 207 | for(;;) |
db137867 AC |
208 | { |
209 | dopoll.dp_timeout = delay; | |
210 | dopoll.dp_nfds = maxfd; | |
211 | dopoll.dp_fds = &pollfds[0]; | |
212 | num = ioctl(dpfd, DP_POLL, &dopoll); | |
213 | if(num >= 0) | |
214 | break; | |
215 | if(rb_ignore_errno(errno)) | |
216 | break; | |
217 | rb_set_time(); | |
218 | return RB_ERROR; | |
219 | } | |
220 | ||
221 | rb_set_time(); | |
222 | if(num == 0) | |
223 | continue; | |
224 | ||
3202e249 | 225 | for(i = 0; i < num; i++) |
db137867 AC |
226 | { |
227 | int fd = dopoll.dp_fds[i].fd; | |
228 | PF *hdl = NULL; | |
229 | rb_fde_t *F = rb_find_fd(fd); | |
3202e249 VY |
230 | if((dopoll.dp_fds[i].revents & (POLLRDNORM | POLLIN | POLLHUP | |
231 | POLLERR)) | |
db137867 AC |
232 | && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) |
233 | { | |
234 | if((hdl = F->read_handler) != NULL) | |
235 | { | |
236 | F->read_handler = NULL; | |
237 | hdl(F, F->read_data); | |
238 | /* | |
239 | * this call used to be with a NULL pointer, BUT | |
240 | * in the devpoll case we only want to update the | |
241 | * poll set *if* the handler changes state (active -> | |
242 | * NULL or vice versa.) | |
243 | */ | |
030272f3 | 244 | devpoll_update_events(F, RB_SELECT_READ, F->read_handler); |
db137867 AC |
245 | } |
246 | } | |
247 | ||
248 | if(!IsFDOpen(F)) | |
249 | continue; /* Read handler closed us..go on to do something more useful */ | |
3202e249 VY |
250 | if((dopoll.dp_fds[i].revents & (POLLWRNORM | POLLOUT | POLLHUP | |
251 | POLLERR)) | |
db137867 AC |
252 | && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) |
253 | { | |
254 | if((hdl = F->write_handler) != NULL) | |
255 | { | |
256 | F->write_handler = NULL; | |
257 | hdl(F, F->write_data); | |
258 | /* See above similar code in the read case */ | |
030272f3 | 259 | devpoll_update_events(F, |
db137867 AC |
260 | RB_SELECT_WRITE, F->write_handler); |
261 | } | |
262 | ||
263 | } | |
264 | } | |
265 | return RB_OK; | |
266 | } | |
3202e249 | 267 | while(0); |
db137867 AC |
268 | /* XXX Get here, we broke! */ |
269 | return 0; | |
270 | } | |
271 | ||
272 | #else /* /dev/poll not supported */ | |
3202e249 | 273 | int |
db137867 AC |
274 | rb_init_netio_devpoll(void) |
275 | { | |
276 | return ENOSYS; | |
277 | } | |
278 | ||
279 | void | |
8679c0fe | 280 | rb_setselect_devpoll(rb_fde_t *F __attribute__((unused)), unsigned int type __attribute__((unused)), PF * handler __attribute__((unused)), void *client_data __attribute__((unused))) |
db137867 AC |
281 | { |
282 | errno = ENOSYS; | |
283 | return; | |
284 | } | |
285 | ||
286 | int | |
8679c0fe | 287 | rb_select_devpoll(long delay __attribute__((unused))) |
db137867 AC |
288 | { |
289 | errno = ENOSYS; | |
290 | return -1; | |
291 | } | |
292 | ||
293 | int | |
8679c0fe | 294 | rb_setup_fd_devpoll(rb_fde_t *F __attribute__((unused))) |
db137867 AC |
295 | { |
296 | errno = ENOSYS; | |
297 | return -1; | |
298 | } | |
299 | #endif |