1 /* ioset.h - srvx event loop
2 * Copyright 2002-2004, 2006 srvx Development Team
4 * This file is part of srvx.
6 * srvx is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with srvx; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 #include "ioset-impl.h"
30 #ifdef HAVE_SYS_SOCKET_H
31 #include <sys/socket.h>
34 #define IS_EOL(CH) ((CH) == '\n')
36 extern int uplink_connect(void);
40 static struct io_engine *engine;
41 static struct io_fd *active_fd;
44 ioq_init(struct ioq *ioq, int size) {
45 ioq->buf = malloc(size);
46 ioq->get = ioq->put = 0;
51 ioq_put_avail(const struct ioq *ioq) {
52 /* Subtract 1 from ioq->get to be sure we don't fill the buffer
53 * and make it look empty even when there's data in it. */
54 if (ioq->put < ioq->get)
55 return ioq->get - ioq->put - 1;
56 else if (ioq->get == 0)
57 return ioq->size - ioq->put - 1;
59 return ioq->size - ioq->put;
63 ioq_get_avail(const struct ioq *ioq) {
64 return ((ioq->put < ioq->get) ? ioq->size : ioq->put) - ioq->get;
68 ioq_used(const struct ioq *ioq) {
69 return ((ioq->put < ioq->get) ? ioq->size : 0) + ioq->put - ioq->get;
73 ioq_grow(struct ioq *ioq) {
74 int new_size = ioq->size << 1;
75 char *new_buf = malloc(new_size);
76 int get_avail = ioq_get_avail(ioq);
77 memcpy(new_buf, ioq->buf + ioq->get, get_avail);
78 if (ioq->put < ioq->get)
79 memcpy(new_buf + get_avail, ioq->buf, ioq->put);
81 ioq->put = ioq_used(ioq);
85 return new_size - ioq->put;
88 extern struct io_engine io_engine_kqueue;
89 extern struct io_engine io_engine_epoll;
90 extern struct io_engine io_engine_win32;
91 extern struct io_engine io_engine_select;
96 if (engine) /* someone beat us to it */
100 if (!engine && io_engine_kqueue.init())
101 engine = &io_engine_kqueue;
105 if (!engine && io_engine_epoll.init())
106 engine = &io_engine_epoll;
110 if (!engine && io_engine_win32.init())
111 engine = &io_engine_win32;
115 /* we found one that works */
116 } else if (io_engine_select.init())
117 engine = &io_engine_select;
119 log_module(MAIN_LOG, LOG_FATAL, "No usable I/O engine found.");
120 log_module(MAIN_LOG, LOG_DEBUG, "Using %s I/O engine.", engine->name);
124 ioset_cleanup(void) {
134 log_module(MAIN_LOG, LOG_ERROR, "Somebody called ioset_add(%d) on a negative fd!", fd);
139 res = calloc(1, sizeof(*res));
143 ioq_init(&res->send, 1024);
144 ioq_init(&res->recv, 1024);
145 flags = fcntl(fd, F_GETFL);
146 fcntl(fd, F_SETFL, flags|O_NONBLOCK);
151 struct io_fd *ioset_listen(struct sockaddr *local, unsigned int sa_size, void *data, void (*accept_cb)(struct io_fd *listener, struct io_fd *new_connect))
158 fd = socket(local ? local->sa_family : PF_INET, SOCK_STREAM, 0);
160 log_module(MAIN_LOG, LOG_ERROR, "Unable to create listening socket: %s", strerror(errno));
164 if (local && sa_size) {
165 res = bind(fd, local, sa_size);
167 log_module(MAIN_LOG, LOG_ERROR, "Unable to bind listening socket %d: %s", fd, strerror(errno));
173 res = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
175 log_module(MAIN_LOG, LOG_WARNING, "Unable to mark listener address as re-usable: %s", strerror(errno));
181 log_module(MAIN_LOG, LOG_ERROR, "Unable to listen on socket %d: %s", fd, strerror(errno));
186 io_fd = ioset_add(fd);
191 io_fd->state = IO_LISTENING;
193 io_fd->accept_cb = accept_cb;
194 engine->update(io_fd);
199 ioset_connect(struct sockaddr *local, unsigned int sa_size, const char *peer, unsigned int port, int blocking, void *data, void (*connect_cb)(struct io_fd *fd, int error)) {
200 struct addrinfo hints;
203 struct io_fd *old_active;
208 memset(&hints, 0, sizeof(hints));
209 hints.ai_family = local ? local->sa_family : 0;
210 hints.ai_socktype = SOCK_STREAM;
211 snprintf(portnum, sizeof(portnum), "%u", port);
212 if (getaddrinfo(peer, portnum, &hints, &ai)) {
213 log_module(MAIN_LOG, LOG_ERROR, "getaddrinfo(%s, %s) failed.", peer, portnum);
218 if ((fd = socket(local->sa_family, SOCK_STREAM, 0)) < 0) {
219 log_module(MAIN_LOG, LOG_ERROR, "socket() for %s returned errno %d (%s)", peer, errno, strerror(errno));
223 if (bind(fd, local, sa_size) < 0) {
224 log_module(MAIN_LOG, LOG_ERROR, "bind() of socket for %s (fd %d) returned errno %d (%s). Will let operating system choose.", peer, fd, errno, strerror(errno));
227 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
228 log_module(MAIN_LOG, LOG_ERROR, "socket() for %s returned errno %d (%s).", peer, errno, strerror(errno));
235 res = connect(fd, ai->ai_addr, ai->ai_addrlen);
236 io_fd = ioset_add(fd);
238 io_fd = ioset_add(fd);
239 res = connect(fd, ai->ai_addr, ai->ai_addrlen);
246 io_fd->state = IO_CONNECTING;
248 io_fd->connect_cb = connect_cb;
251 case EINPROGRESS: /* only if !blocking */
252 engine->update(io_fd);
255 log_module(MAIN_LOG, LOG_ERROR, "connect(%s:%d) (fd %d) returned errno %d (%s).", peer, port, io_fd->fd, errno, strerror(errno));
256 /* then fall through */
259 ioset_close(io_fd, 1);
260 engine->update(io_fd);
264 io_fd->state = IO_CONNECTED;
265 old_active = active_fd;
267 connect_cb(io_fd, ((res < 0) ? errno : 0));
269 engine->update(io_fd);
270 if (old_active != io_fd)
271 active_fd = old_active;
275 void ioset_update(struct io_fd *fd) {
280 ioset_try_write(struct io_fd *fd) {
282 unsigned int req = ioq_get_avail(&fd->send);
283 res = write(fd->fd, fd->send.buf+fd->send.get, req);
289 log_module(MAIN_LOG, LOG_ERROR, "write() on fd %d error %d: %s", fd->fd, errno, strerror(errno));
293 if (fd->send.get == fd->send.size)
300 ioset_close(struct io_fd *fdp, int os_close) {
303 if (active_fd == fdp)
306 fdp->destroy_cb(fdp);
307 if (fdp->send.get != fdp->send.put) {
310 flags = fcntl(fdp->fd, F_GETFL);
311 fcntl(fdp->fd, F_SETFL, flags&~O_NONBLOCK);
312 ioset_try_write(fdp);
313 /* it may need to send the beginning of the buffer now.. */
314 if (fdp->send.get != fdp->send.put)
315 ioset_try_write(fdp);
326 ioset_accept(struct io_fd *listener)
328 struct io_fd *old_active;
329 struct io_fd *new_fd;
332 fd = accept(listener->fd, NULL, 0);
334 log_module(MAIN_LOG, LOG_ERROR, "Unable to accept new connection on listener %d: %s", listener->fd, strerror(errno));
338 new_fd = ioset_add(fd);
339 new_fd->state = IO_CONNECTED;
340 old_active = active_fd;
342 listener->accept_cb(listener, new_fd);
343 assert(active_fd == NULL || active_fd == new_fd);
344 if (active_fd == new_fd) {
345 if (new_fd->send.get != new_fd->send.put)
346 ioset_try_write(new_fd);
348 engine->update(new_fd);
350 active_fd = old_active;
354 ioset_find_line_length(struct io_fd *fd) {
355 unsigned int pos, max, len;
357 max = (fd->recv.put < fd->recv.get) ? fd->recv.size : fd->recv.put;
358 for (pos = fd->recv.get; pos < max; ++pos, ++len)
359 if (IS_EOL(fd->recv.buf[pos]))
360 return fd->line_len = len + 1;
361 if (fd->recv.put < fd->recv.get)
362 for (pos = 0; pos < fd->recv.put; ++pos, ++len)
363 if (IS_EOL(fd->recv.buf[pos]))
364 return fd->line_len = len + 1;
365 return fd->line_len = 0;
369 ioset_buffered_read(struct io_fd *fd) {
370 int put_avail, nbr, fdnum;
372 if (!(put_avail = ioq_put_avail(&fd->recv)))
373 put_avail = ioq_grow(&fd->recv);
374 nbr = read(fd->fd, fd->recv.buf + fd->recv.put, put_avail);
380 log_module(MAIN_LOG, LOG_ERROR, "Unexpected read() error %d on fd %d: %s", errno, fd->fd, strerror(errno));
381 /* Just flag it as EOF and call readable_cb() to notify the fd's owner. */
382 fd->state = IO_CLOSED;
387 } else if (nbr == 0) {
388 fd->state = IO_CLOSED;
393 if (fd->line_len == 0) {
395 for (pos = fd->recv.put; pos < fd->recv.put + nbr; ++pos) {
396 if (IS_EOL(fd->recv.buf[pos])) {
397 if (fd->recv.put < fd->recv.get)
398 fd->line_len = fd->recv.size + pos + 1 - fd->recv.get;
400 fd->line_len = pos + 1 - fd->recv.get;
406 if (fd->recv.put == fd->recv.size)
409 while (fd->line_len > 0) {
410 struct io_fd *old_active;
413 old_active = active_fd;
417 ioset_find_line_length(fd);
420 if (old_active != fd)
421 active_fd = old_active;
429 ioset_line_read(struct io_fd *fd, char *dest, int max) {
431 if ((fd->state == IO_CLOSED) && (!ioq_get_avail(&fd->recv) || (fd->line_len < 0)))
433 if (fd->line_len < 0)
435 if (fd->line_len < max)
437 avail = ioq_get_avail(&fd->recv);
439 memcpy(dest, fd->recv.buf + fd->recv.get, avail);
440 fd->recv.get += avail;
441 assert(fd->recv.get == fd->recv.size);
447 memcpy(dest + done, fd->recv.buf + fd->recv.get, max - done);
448 fd->recv.get += max - done;
449 if (fd->recv.get == fd->recv.size)
452 ioset_find_line_length(fd);
457 ioset_events(struct io_fd *fd, int readable, int writable)
459 if (!fd || (!readable && !writable))
466 if (active_fd && readable)
470 assert(active_fd == NULL || active_fd == fd);
471 if (active_fd && readable) {
475 if (getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &rc, &arglen) < 0)
477 fd->state = IO_CLOSED;
479 fd->connect_cb(fd, rc);
480 } else if (active_fd && writable) {
481 fd->state = IO_CONNECTED;
483 fd->connect_cb(fd, 0);
488 /* and fall through */
490 assert(active_fd == NULL || active_fd == fd);
491 if (active_fd && readable) {
493 ioset_buffered_read(fd);
498 assert(active_fd == NULL || active_fd == fd);
499 if (active_fd && writable)
507 extern struct io_fd *socket_io_fd;
508 struct timeval timeout;
511 while (!quit_services) {
512 while (!socket_io_fd)
515 /* How long to sleep? (fill in select_timeout) */
516 wakey = timeq_next();
517 if ((wakey - now) < 0)
520 timeout.tv_sec = wakey - now;
523 if (engine->loop(&timeout))
526 /* Call any timeq events we need to call. */
533 extern char *services_config;
534 conf_read(services_config);
541 ioset_write(struct io_fd *fd, const char *buf, unsigned int nbw) {
543 while (ioq_used(&fd->send) + nbw >= fd->send.size)
545 avail = ioq_put_avail(&fd->send);
547 memcpy(fd->send.buf + fd->send.put, buf, avail);
552 memcpy(fd->send.buf + fd->send.put, buf, nbw);
554 if (fd->send.put == fd->send.size)
560 ioset_printf(struct io_fd *fd, const char *fmt, ...) {
566 res = vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap);
568 if (res > 0 && (size_t)res <= sizeof(tmpbuf))
569 ioset_write(fd, tmpbuf, res);
574 ioset_set_time(unsigned long new_now) {
575 clock_skew = new_now - time(NULL);