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db137867 AC |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * sigio.c: Linux Realtime SIGIO 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 Aaron Sethman <androsyn@ratbox.org> | |
9 | * Copyright (C) 2002 ircd-ratbox development team | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
24 | * USA | |
25 | * | |
3202e249 | 26 | * $Id: sigio.c 26092 2008-09-19 15:13:52Z androsyn $ |
db137867 AC |
27 | */ |
28 | ||
29 | #ifndef _GNU_SOURCE | |
30 | #define _GNU_SOURCE 1 /* Needed for F_SETSIG */ | |
31 | #endif | |
32 | ||
33 | #include <libratbox_config.h> | |
34 | #include <ratbox_lib.h> | |
35 | #include <commio-int.h> | |
36 | #include <event-int.h> | |
37 | #include <fcntl.h> /* Yes this needs to be before the ifdef */ | |
38 | ||
39 | #if defined(HAVE_SYS_POLL_H) && (HAVE_POLL) && (F_SETSIG) | |
40 | #define USING_SIGIO | |
41 | #endif | |
42 | ||
43 | ||
44 | #ifdef USING_SIGIO | |
45 | ||
46 | #include <signal.h> | |
47 | #include <sys/poll.h> | |
48 | ||
49 | #if defined(USE_TIMER_CREATE) | |
50 | #define SIGIO_SCHED_EVENT 1 | |
51 | #endif | |
52 | ||
53 | #define RTSIGIO SIGRTMIN | |
54 | #define RTSIGTIM (SIGRTMIN+1) | |
55 | ||
56 | ||
57 | struct _pollfd_list | |
58 | { | |
59 | struct pollfd *pollfds; | |
60 | int maxindex; /* highest FD number */ | |
61 | int allocated; | |
62 | }; | |
63 | ||
64 | typedef struct _pollfd_list pollfd_list_t; | |
65 | ||
66 | pollfd_list_t pollfd_list; | |
67 | static int can_do_event = 0; | |
68 | static int sigio_is_screwed = 0; /* We overflowed our sigio queue */ | |
69 | static sigset_t our_sigset; | |
70 | ||
71 | ||
72 | /* | |
73 | * rb_init_netio | |
74 | * | |
75 | * This is a needed exported function which will be called to initialise | |
76 | * the network loop code. | |
77 | */ | |
78 | int | |
79 | rb_init_netio_sigio(void) | |
80 | { | |
81 | int fd; | |
82 | pollfd_list.pollfds = rb_malloc(rb_getmaxconnect() * (sizeof(struct pollfd))); | |
83 | pollfd_list.allocated = rb_getmaxconnect(); | |
3202e249 | 84 | for(fd = 0; fd < rb_getmaxconnect(); fd++) |
db137867 AC |
85 | { |
86 | pollfd_list.pollfds[fd].fd = -1; | |
87 | } | |
88 | ||
89 | pollfd_list.maxindex = 0; | |
90 | ||
91 | sigio_is_screwed = 1; /* Start off with poll first.. */ | |
92 | ||
93 | sigemptyset(&our_sigset); | |
94 | sigaddset(&our_sigset, RTSIGIO); | |
95 | sigaddset(&our_sigset, SIGIO); | |
96 | #ifdef SIGIO_SCHED_EVENT | |
97 | sigaddset(&our_sigset, RTSIGTIM); | |
98 | #endif | |
99 | sigprocmask(SIG_BLOCK, &our_sigset, NULL); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static inline void | |
104 | resize_pollarray(int fd) | |
105 | { | |
c2ac22cc | 106 | if(rb_unlikely(fd >= pollfd_list.allocated)) |
db137867 AC |
107 | { |
108 | int x, old_value = pollfd_list.allocated; | |
109 | pollfd_list.allocated += 1024; | |
110 | pollfd_list.pollfds = | |
111 | rb_realloc(pollfd_list.pollfds, | |
112 | pollfd_list.allocated * (sizeof(struct pollfd))); | |
113 | memset(&pollfd_list.pollfds[old_value + 1], 0, sizeof(struct pollfd) * 1024); | |
3202e249 | 114 | for(x = old_value + 1; x < pollfd_list.allocated; x++) |
db137867 AC |
115 | { |
116 | pollfd_list.pollfds[x].fd = -1; | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | ||
122 | /* | |
123 | * void setup_sigio_fd(int fd) | |
124 | * | |
125 | * Input: File descriptor | |
126 | * Output: None | |
127 | * Side Effect: Sets the FD up for SIGIO | |
128 | */ | |
129 | ||
130 | int | |
3202e249 | 131 | rb_setup_fd_sigio(rb_fde_t *F) |
db137867 AC |
132 | { |
133 | int flags = 0; | |
134 | int fd = F->fd; | |
135 | flags = fcntl(fd, F_GETFL, 0); | |
136 | if(flags == -1) | |
137 | return 0; | |
138 | /* if set async, clear it so we can reset it in the kernel :/ */ | |
139 | if(flags & O_ASYNC) | |
140 | { | |
141 | flags &= ~O_ASYNC; | |
142 | fcntl(fd, F_SETFL, flags); | |
143 | } | |
144 | ||
145 | flags |= O_ASYNC | O_NONBLOCK; | |
146 | ||
147 | if(fcntl(fd, F_SETFL, flags) == -1) | |
148 | return 0; | |
149 | ||
150 | if(fcntl(fd, F_SETSIG, RTSIGIO) == -1) | |
151 | return 0; | |
152 | if(fcntl(fd, F_SETOWN, getpid()) == -1) | |
153 | return 0; | |
154 | ||
155 | return 1; | |
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_sigio(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) |
db137867 AC |
166 | { |
167 | if(F == NULL) | |
168 | return; | |
169 | ||
170 | if(type & RB_SELECT_READ) | |
171 | { | |
172 | F->read_handler = handler; | |
173 | F->read_data = client_data; | |
174 | if(handler != NULL) | |
175 | F->pflags |= POLLRDNORM; | |
176 | else | |
177 | F->pflags &= ~POLLRDNORM; | |
178 | } | |
179 | if(type & RB_SELECT_WRITE) | |
180 | { | |
181 | F->write_handler = handler; | |
182 | F->write_data = client_data; | |
183 | if(handler != NULL) | |
184 | F->pflags |= POLLWRNORM; | |
185 | else | |
186 | F->pflags &= ~POLLWRNORM; | |
187 | } | |
188 | ||
189 | resize_pollarray(F->fd); | |
190 | ||
191 | if(F->pflags <= 0) | |
192 | { | |
193 | pollfd_list.pollfds[F->fd].events = 0; | |
194 | pollfd_list.pollfds[F->fd].fd = -1; | |
195 | if(F->fd == pollfd_list.maxindex) | |
196 | { | |
3202e249 VY |
197 | while(pollfd_list.maxindex >= 0 |
198 | && pollfd_list.pollfds[pollfd_list.maxindex].fd == -1) | |
db137867 AC |
199 | pollfd_list.maxindex--; |
200 | } | |
201 | } | |
202 | else | |
203 | { | |
204 | pollfd_list.pollfds[F->fd].events = F->pflags; | |
205 | pollfd_list.pollfds[F->fd].fd = F->fd; | |
206 | if(F->fd > pollfd_list.maxindex) | |
207 | pollfd_list.maxindex = F->fd; | |
208 | } | |
209 | ||
210 | } | |
211 | ||
212 | ||
213 | ||
214 | /* int rb_select(long delay) | |
215 | * Input: The maximum time to delay. | |
216 | * Output: Returns -1 on error, 0 on success. | |
217 | * Side-effects: Deregisters future interest in IO and calls the handlers | |
218 | * if an event occurs for an FD. | |
219 | * Comments: Check all connections for new connections and input data | |
220 | * that is to be processed. Also check for connections with data queued | |
221 | * and whether we can write it out. | |
222 | * Called to do the new-style IO, courtesy of squid (like most of this | |
223 | * new IO code). This routine handles the stuff we've hidden in | |
224 | * rb_setselect and fd_table[] and calls callbacks for IO ready | |
225 | * events. | |
226 | */ | |
227 | int | |
228 | rb_select_sigio(long delay) | |
229 | { | |
230 | int num = 0; | |
231 | int revents = 0; | |
232 | int sig; | |
233 | int fd; | |
234 | int ci; | |
235 | PF *hdl; | |
236 | rb_fde_t *F; | |
237 | void *data; | |
238 | struct siginfo si; | |
239 | ||
240 | struct timespec timeout; | |
241 | if(rb_sigio_supports_event() || delay >= 0) | |
242 | { | |
243 | timeout.tv_sec = (delay / 1000); | |
244 | timeout.tv_nsec = (delay % 1000) * 1000000; | |
245 | } | |
246 | ||
3202e249 | 247 | for(;;) |
db137867 AC |
248 | { |
249 | if(!sigio_is_screwed) | |
250 | { | |
251 | if(can_do_event || delay < 0) | |
252 | { | |
253 | sig = sigwaitinfo(&our_sigset, &si); | |
254 | } | |
255 | else | |
256 | sig = sigtimedwait(&our_sigset, &si, &timeout); | |
257 | ||
258 | if(sig > 0) | |
259 | { | |
260 | ||
261 | if(sig == SIGIO) | |
262 | { | |
263 | rb_lib_log | |
264 | ("Kernel RT Signal queue overflowed. Is ulimit -i too small(or perhaps /proc/sys/kernel/rtsig-max on old kernels)"); | |
265 | sigio_is_screwed = 1; | |
266 | break; | |
267 | } | |
268 | #ifdef SIGIO_SCHED_EVENT | |
269 | if(sig == RTSIGTIM && can_do_event) | |
270 | { | |
3202e249 | 271 | struct ev_entry *ev = (struct ev_entry *)si.si_ptr; |
db137867 AC |
272 | if(ev == NULL) |
273 | continue; | |
274 | rb_run_event(ev); | |
275 | continue; | |
276 | } | |
277 | #endif | |
278 | fd = si.si_fd; | |
279 | pollfd_list.pollfds[fd].revents |= si.si_band; | |
280 | revents = pollfd_list.pollfds[fd].revents; | |
281 | num++; | |
282 | F = rb_find_fd(fd); | |
283 | if(F == NULL) | |
284 | continue; | |
285 | ||
286 | if(revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) | |
287 | { | |
288 | hdl = F->read_handler; | |
289 | data = F->read_data; | |
290 | F->read_handler = NULL; | |
291 | F->read_data = NULL; | |
292 | if(hdl) | |
293 | hdl(F, data); | |
294 | } | |
295 | ||
296 | if(revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR)) | |
297 | { | |
298 | hdl = F->write_handler; | |
299 | data = F->write_data; | |
300 | F->write_handler = NULL; | |
301 | F->write_data = NULL; | |
302 | if(hdl) | |
303 | hdl(F, data); | |
304 | } | |
305 | } | |
306 | else | |
307 | break; | |
308 | ||
309 | } | |
310 | else | |
311 | break; | |
312 | } | |
313 | ||
314 | if(!sigio_is_screwed) /* We don't need to proceed */ | |
315 | { | |
316 | rb_set_time(); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | signal(RTSIGIO, SIG_IGN); | |
321 | signal(RTSIGIO, SIG_DFL); | |
322 | sigio_is_screwed = 0; | |
323 | ||
324 | ||
325 | num = poll(pollfd_list.pollfds, pollfd_list.maxindex + 1, delay); | |
326 | rb_set_time(); | |
327 | if(num < 0) | |
328 | { | |
329 | if(!rb_ignore_errno(errno)) | |
330 | return RB_OK; | |
331 | else | |
332 | return RB_ERROR; | |
333 | } | |
334 | if(num == 0) | |
335 | return RB_OK; | |
336 | ||
337 | /* XXX we *could* optimise by falling out after doing num fds ... */ | |
3202e249 | 338 | for(ci = 0; ci < pollfd_list.maxindex + 1; ci++) |
db137867 AC |
339 | { |
340 | if(((revents = pollfd_list.pollfds[ci].revents) == 0) | |
341 | || (pollfd_list.pollfds[ci].fd) == -1) | |
342 | continue; | |
343 | fd = pollfd_list.pollfds[ci].fd; | |
344 | F = rb_find_fd(fd); | |
345 | if(F == NULL) | |
346 | continue; | |
347 | if(revents & (POLLRDNORM | POLLIN | POLLHUP | POLLERR)) | |
348 | { | |
349 | hdl = F->read_handler; | |
350 | data = F->read_data; | |
351 | F->read_handler = NULL; | |
352 | F->read_data = NULL; | |
353 | if(hdl) | |
354 | hdl(F, data); | |
355 | } | |
356 | ||
357 | if(IsFDOpen(F) && (revents & (POLLWRNORM | POLLOUT | POLLHUP | POLLERR))) | |
358 | { | |
359 | hdl = F->write_handler; | |
360 | data = F->write_data; | |
361 | F->write_handler = NULL; | |
362 | F->write_data = NULL; | |
363 | if(hdl) | |
364 | hdl(F, data); | |
365 | } | |
366 | if(F->read_handler == NULL) | |
367 | rb_setselect_sigio(F, RB_SELECT_READ, NULL, NULL); | |
368 | if(F->write_handler == NULL) | |
369 | rb_setselect_sigio(F, RB_SELECT_WRITE, NULL, NULL); | |
370 | ||
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | #if defined(SIGIO_SCHED_EVENT) | |
377 | void | |
378 | rb_sigio_init_event(void) | |
379 | { | |
380 | rb_sigio_supports_event(); | |
381 | } | |
382 | ||
383 | ||
384 | int | |
385 | rb_sigio_supports_event(void) | |
386 | { | |
387 | timer_t timer; | |
388 | struct sigevent ev; | |
389 | if(can_do_event == 1) | |
390 | return 1; | |
391 | if(can_do_event == -1) | |
392 | return 0; | |
393 | ||
394 | ev.sigev_signo = SIGVTALRM; | |
395 | ev.sigev_notify = SIGEV_SIGNAL; | |
396 | if(timer_create(CLOCK_REALTIME, &ev, &timer) != 0) | |
397 | { | |
398 | can_do_event = -1; | |
399 | return 0; | |
400 | } | |
401 | timer_delete(timer); | |
402 | can_do_event = 1; | |
403 | return 1; | |
404 | } | |
405 | ||
406 | int | |
407 | rb_sigio_sched_event(struct ev_entry *event, int when) | |
408 | { | |
409 | timer_t *id; | |
410 | struct sigevent ev; | |
411 | struct itimerspec ts; | |
412 | if(can_do_event <= 0) | |
413 | return 0; | |
414 | ||
415 | memset(&ev, 0, sizeof(&ev)); | |
416 | event->comm_ptr = rb_malloc(sizeof(timer_t)); | |
417 | id = event->comm_ptr; | |
418 | ev.sigev_notify = SIGEV_SIGNAL; | |
419 | ev.sigev_signo = RTSIGTIM; | |
420 | ev.sigev_value.sival_ptr = event; | |
421 | ||
422 | if(timer_create(CLOCK_REALTIME, &ev, id) < 0) | |
423 | { | |
424 | rb_lib_log("timer_create: %s\n", strerror(errno)); | |
425 | return 0; | |
426 | } | |
427 | memset(&ts, 0, sizeof(ts)); | |
428 | ts.it_value.tv_sec = when; | |
429 | ts.it_value.tv_nsec = 0; | |
430 | if(event->frequency != 0) | |
431 | ts.it_interval = ts.it_value; | |
432 | ||
433 | if(timer_settime(*id, 0, &ts, NULL) < 0) | |
434 | { | |
435 | rb_lib_log("timer_settime: %s\n", strerror(errno)); | |
436 | return 0; | |
437 | } | |
438 | return 1; | |
439 | } | |
440 | ||
441 | void | |
442 | rb_sigio_unsched_event(struct ev_entry *event) | |
443 | { | |
444 | if(can_do_event <= 0) | |
445 | return; | |
446 | timer_delete(*((timer_t *) event->comm_ptr)); | |
447 | rb_free(event->comm_ptr); | |
448 | event->comm_ptr = NULL; | |
449 | } | |
450 | #endif /* SIGIO_SCHED_EVENT */ | |
451 | ||
452 | #else | |
453 | ||
454 | int | |
455 | rb_init_netio_sigio(void) | |
456 | { | |
457 | return ENOSYS; | |
458 | } | |
459 | ||
460 | void | |
3202e249 | 461 | rb_setselect_sigio(rb_fde_t *F, unsigned int type, PF * handler, void *client_data) |
db137867 AC |
462 | { |
463 | errno = ENOSYS; | |
464 | return; | |
465 | } | |
466 | ||
467 | int | |
468 | rb_select_sigio(long delay) | |
469 | { | |
470 | errno = ENOSYS; | |
471 | return -1; | |
472 | } | |
473 | ||
474 | int | |
3202e249 | 475 | rb_setup_fd_sigio(rb_fde_t *F) |
db137867 AC |
476 | { |
477 | errno = ENOSYS; | |
478 | return -1; | |
479 | } | |
480 | ||
481 | #endif | |
482 | ||
483 | #if !defined(USING_SIGIO) || !defined(SIGIO_SCHED_EVENT) | |
484 | void | |
485 | rb_sigio_init_event(void) | |
486 | { | |
487 | return; | |
488 | } | |
489 | ||
490 | int | |
491 | rb_sigio_sched_event(struct ev_entry *event, int when) | |
492 | { | |
493 | errno = ENOSYS; | |
494 | return -1; | |
495 | } | |
496 | ||
497 | void | |
498 | rb_sigio_unsched_event(struct ev_entry *event) | |
499 | { | |
500 | return; | |
501 | } | |
502 | ||
503 | int | |
504 | rb_sigio_supports_event(void) | |
505 | { | |
506 | errno = ENOSYS; | |
507 | return 0; | |
508 | } | |
509 | #endif /* !USING_SIGIO || !SIGIO_SCHED_EVENT */ |