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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 | * | |
b57f37fb WP |
25 | */ |
26 | #include <libratbox_config.h> | |
27 | #include <ratbox_lib.h> | |
28 | #include <commio-int.h> | |
29 | #include <fcntl.h> | |
30 | ||
f030cae8 | 31 | #if defined(HAVE_DEVPOLL) && (HAVE_SYS_DEVPOLL_H) |
b57f37fb WP |
32 | #include <sys/devpoll.h> |
33 | ||
b57f37fb WP |
34 | static int dpfd; |
35 | static int maxfd; | |
36 | static short *fdmask; | |
f030cae8 | 37 | static void devpoll_update_events(rb_fde_t *, short, PF *); |
b57f37fb WP |
38 | static void devpoll_write_update(int, int); |
39 | ||
40 | ||
94b4fbf9 | 41 | int |
b57f37fb WP |
42 | rb_setup_fd_devpoll(rb_fde_t *F) |
43 | { | |
94b4fbf9 | 44 | return 0; |
b57f37fb | 45 | } |
94b4fbf9 VY |
46 | |
47 | ||
b57f37fb WP |
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)) | |
94b4fbf9 VY |
68 | rb_lib_log("devpoll_write_update: dpfd write failed %d: %s", errno, |
69 | strerror(errno)); | |
b57f37fb WP |
70 | /* Done! */ |
71 | } | |
72 | ||
73 | static void | |
f030cae8 | 74 | devpoll_update_events(rb_fde_t *F, short filter, PF * handler) |
b57f37fb WP |
75 | { |
76 | int update_required = 0; | |
f030cae8 | 77 | int fd = rb_get_fd(F); |
b57f37fb WP |
78 | int cur_mask = fdmask[fd]; |
79 | PF *cur_handler; | |
b57f37fb WP |
80 | fdmask[fd] = 0; |
81 | switch (filter) | |
82 | { | |
83 | case RB_SELECT_READ: | |
84 | cur_handler = F->read_handler; | |
85 | if(handler) | |
86 | fdmask[fd] |= POLLRDNORM; | |
87 | else | |
88 | fdmask[fd] &= ~POLLRDNORM; | |
89 | if(F->write_handler) | |
90 | fdmask[fd] |= POLLWRNORM; | |
91 | break; | |
92 | case RB_SELECT_WRITE: | |
93 | cur_handler = F->write_handler; | |
94 | if(handler) | |
95 | fdmask[fd] |= POLLWRNORM; | |
96 | else | |
97 | fdmask[fd] &= ~POLLWRNORM; | |
98 | if(F->read_handler) | |
99 | fdmask[fd] |= POLLRDNORM; | |
100 | break; | |
101 | default: | |
102 | return; | |
103 | break; | |
104 | } | |
105 | ||
106 | if(cur_handler == NULL && handler != NULL) | |
107 | update_required++; | |
108 | else if(cur_handler != NULL && handler == NULL) | |
109 | update_required++; | |
110 | if(cur_mask != fdmask[fd]) | |
111 | update_required++; | |
112 | if(update_required) | |
113 | { | |
114 | /* | |
115 | * Ok, we can call devpoll_write_update() here now to re-build the | |
116 | * fd struct. If we end up with nothing on this fd, it won't write | |
117 | * anything. | |
118 | */ | |
119 | if(fdmask[fd]) | |
120 | { | |
121 | devpoll_write_update(fd, POLLREMOVE); | |
122 | devpoll_write_update(fd, fdmask[fd]); | |
123 | } | |
124 | else | |
125 | devpoll_write_update(fd, POLLREMOVE); | |
126 | } | |
127 | } | |
128 | ||
129 | ||
130 | ||
131 | ||
132 | ||
133 | /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ | |
134 | /* Public functions */ | |
135 | ||
136 | ||
137 | /* | |
138 | * rb_init_netio | |
139 | * | |
140 | * This is a needed exported function which will be called to initialise | |
141 | * the network loop code. | |
142 | */ | |
143 | int | |
144 | rb_init_netio_devpoll(void) | |
145 | { | |
146 | dpfd = open("/dev/poll", O_RDWR); | |
147 | if(dpfd < 0) | |
148 | { | |
149 | return errno; | |
150 | } | |
94b4fbf9 | 151 | maxfd = getdtablesize() - 2; /* This makes more sense than HARD_FDLIMIT */ |
b57f37fb WP |
152 | fdmask = rb_malloc(sizeof(fdmask) * maxfd + 1); |
153 | rb_open(dpfd, RB_FD_UNKNOWN, "/dev/poll file descriptor"); | |
f030cae8 | 154 | return 0; |
b57f37fb WP |
155 | } |
156 | ||
157 | /* | |
158 | * rb_setselect | |
159 | * | |
160 | * This is a needed exported function which will be called to register | |
161 | * and deregister interest in a pending IO state for a given FD. | |
162 | */ | |
163 | void | |
94b4fbf9 | 164 | rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) |
b57f37fb WP |
165 | { |
166 | lrb_assert(IsFDOpen(F)); | |
167 | ||
168 | if(type & RB_SELECT_READ) | |
169 | { | |
f030cae8 | 170 | devpoll_update_events(F, RB_SELECT_READ, handler); |
b57f37fb WP |
171 | F->read_handler = handler; |
172 | F->read_data = client_data; | |
173 | } | |
174 | if(type & RB_SELECT_WRITE) | |
175 | { | |
f030cae8 | 176 | devpoll_update_events(F, RB_SELECT_WRITE, handler); |
b57f37fb WP |
177 | F->write_handler = handler; |
178 | F->write_data = client_data; | |
179 | } | |
180 | } | |
181 | ||
182 | /* | |
183 | * Check all connections for new connections and input data that is to be | |
184 | * processed. Also check for connections with data queued and whether we can | |
185 | * write it out. | |
186 | */ | |
187 | ||
188 | /* | |
189 | * rb_select | |
190 | * | |
191 | * Called to do the new-style IO, courtesy of squid (like most of this | |
192 | * new IO code). This routine handles the stuff we've hidden in | |
193 | * rb_setselect and fd_table[] and calls callbacks for IO ready | |
194 | * events. | |
195 | */ | |
196 | ||
197 | int | |
198 | rb_select_devpoll(long delay) | |
199 | { | |
200 | int num, i; | |
201 | struct pollfd pollfds[maxfd]; | |
202 | struct dvpoll dopoll; | |
203 | ||
204 | do | |
205 | { | |
94b4fbf9 | 206 | for(;;) |
b57f37fb WP |
207 | { |
208 | dopoll.dp_timeout = delay; | |
209 | dopoll.dp_nfds = maxfd; | |
210 | dopoll.dp_fds = &pollfds[0]; | |
211 | num = ioctl(dpfd, DP_POLL, &dopoll); | |
212 | if(num >= 0) | |
213 | break; | |
214 | if(rb_ignore_errno(errno)) | |
215 | break; | |
216 | rb_set_time(); | |
217 | return RB_ERROR; | |
218 | } | |
219 | ||
220 | rb_set_time(); | |
221 | if(num == 0) | |
222 | continue; | |
223 | ||
94b4fbf9 | 224 | for(i = 0; i < num; i++) |
b57f37fb WP |
225 | { |
226 | int fd = dopoll.dp_fds[i].fd; | |
227 | PF *hdl = NULL; | |
228 | rb_fde_t *F = rb_find_fd(fd); | |
94b4fbf9 VY |
229 | if((dopoll.dp_fds[i].revents & (POLLRDNORM | POLLIN | POLLHUP | |
230 | POLLERR)) | |
b57f37fb WP |
231 | && (dopoll.dp_fds[i].events & (POLLRDNORM | POLLIN))) |
232 | { | |
233 | if((hdl = F->read_handler) != NULL) | |
234 | { | |
235 | F->read_handler = NULL; | |
236 | hdl(F, F->read_data); | |
237 | /* | |
238 | * this call used to be with a NULL pointer, BUT | |
239 | * in the devpoll case we only want to update the | |
240 | * poll set *if* the handler changes state (active -> | |
241 | * NULL or vice versa.) | |
242 | */ | |
f030cae8 | 243 | devpoll_update_events(F, RB_SELECT_READ, F->read_handler); |
b57f37fb WP |
244 | } |
245 | } | |
246 | ||
247 | if(!IsFDOpen(F)) | |
248 | continue; /* Read handler closed us..go on to do something more useful */ | |
94b4fbf9 VY |
249 | if((dopoll.dp_fds[i].revents & (POLLWRNORM | POLLOUT | POLLHUP | |
250 | POLLERR)) | |
b57f37fb WP |
251 | && (dopoll.dp_fds[i].events & (POLLWRNORM | POLLOUT))) |
252 | { | |
253 | if((hdl = F->write_handler) != NULL) | |
254 | { | |
255 | F->write_handler = NULL; | |
256 | hdl(F, F->write_data); | |
257 | /* See above similar code in the read case */ | |
f030cae8 | 258 | devpoll_update_events(F, |
b57f37fb WP |
259 | RB_SELECT_WRITE, F->write_handler); |
260 | } | |
261 | ||
262 | } | |
263 | } | |
264 | return RB_OK; | |
265 | } | |
94b4fbf9 | 266 | while(0); |
b57f37fb WP |
267 | /* XXX Get here, we broke! */ |
268 | return 0; | |
269 | } | |
270 | ||
271 | #else /* /dev/poll not supported */ | |
94b4fbf9 | 272 | int |
b57f37fb WP |
273 | rb_init_netio_devpoll(void) |
274 | { | |
275 | return ENOSYS; | |
276 | } | |
277 | ||
278 | void | |
279 | rb_setselect_devpoll(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) | |
280 | { | |
281 | errno = ENOSYS; | |
282 | return; | |
283 | } | |
284 | ||
285 | int | |
286 | rb_select_devpoll(long delay) | |
287 | { | |
288 | errno = ENOSYS; | |
289 | return -1; | |
290 | } | |
291 | ||
292 | int | |
293 | rb_setup_fd_devpoll(rb_fde_t *F) | |
294 | { | |
295 | errno = ENOSYS; | |
296 | return -1; | |
297 | } | |
298 | #endif |