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 assert(engine == NULL);
99 if (!engine && io_engine_kqueue.init())
100 engine = &io_engine_kqueue;
104 if (!engine && io_engine_epoll.init())
105 engine = &io_engine_epoll;
109 if (!engine && io_engine_win32.init())
110 engine = &io_engine_win32;
114 /* we found one that works */
115 } else if (io_engine_select.init())
116 engine = &io_engine_select;
118 log_module(MAIN_LOG, LOG_FATAL, "No usable I/O engine found.");
119 log_module(MAIN_LOG, LOG_DEBUG, "Using %s I/O engine.", engine->name);
123 ioset_cleanup(void) {
133 log_module(MAIN_LOG, LOG_ERROR, "Somebody called ioset_add(%d) on a negative fd!", fd);
136 res = calloc(1, sizeof(*res));
140 ioq_init(&res->send, 1024);
141 ioq_init(&res->recv, 1024);
143 flags = fcntl(fd, F_GETFL);
144 fcntl(fd, F_SETFL, flags|O_NONBLOCK);
148 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))
155 fd = socket(local ? local->sa_family : PF_INET, SOCK_STREAM, 0);
157 log_module(MAIN_LOG, LOG_ERROR, "Unable to create listening socket: %s", strerror(errno));
161 if (local && sa_size) {
162 res = bind(fd, local, sa_size);
164 log_module(MAIN_LOG, LOG_ERROR, "Unable to bind listening socket %d: %s", fd, strerror(errno));
170 res = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
172 log_module(MAIN_LOG, LOG_WARNING, "Unable to mark listener address as re-usable: %s", strerror(errno));
178 log_module(MAIN_LOG, LOG_ERROR, "Unable to listen on socket %d: %s", fd, strerror(errno));
183 io_fd = ioset_add(fd);
188 io_fd->state = IO_LISTENING;
190 io_fd->accept_cb = accept_cb;
191 engine->update(io_fd);
196 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)) {
199 struct addrinfo hints, *ai;
202 memset(&hints, 0, sizeof(hints));
203 hints.ai_family = local ? local->sa_family : 0;
204 hints.ai_socktype = SOCK_STREAM;
205 snprintf(portnum, sizeof(portnum), "%u", port);
206 if (getaddrinfo(peer, portnum, &hints, &ai)) {
207 log_module(MAIN_LOG, LOG_ERROR, "getaddrinfo(%s, %s) failed.", peer, portnum);
212 if ((fd = socket(local->sa_family, SOCK_STREAM, 0)) < 0) {
213 log_module(MAIN_LOG, LOG_ERROR, "socket() for %s returned errno %d (%s)", peer, errno, strerror(errno));
217 if (bind(fd, local, sa_size) < 0) {
218 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));
221 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
222 log_module(MAIN_LOG, LOG_ERROR, "socket() for %s returned errno %d (%s).", peer, errno, strerror(errno));
229 res = connect(fd, ai->ai_addr, ai->ai_addrlen);
230 io_fd = ioset_add(fd);
232 io_fd = ioset_add(fd);
233 res = connect(fd, ai->ai_addr, ai->ai_addrlen);
240 io_fd->state = IO_CONNECTING;
242 io_fd->connect_cb = connect_cb;
245 case EINPROGRESS: /* only if !blocking */
246 engine->update(io_fd);
249 log_module(MAIN_LOG, LOG_ERROR, "connect(%s:%d) (fd %d) returned errno %d (%s).", peer, port, io_fd->fd, errno, strerror(errno));
250 /* then fall through */
253 ioset_close(io_fd, 1);
254 engine->update(io_fd);
258 io_fd->state = IO_CONNECTED;
260 connect_cb(io_fd, ((res < 0) ? errno : 0));
261 engine->update(io_fd);
266 ioset_try_write(struct io_fd *fd) {
268 unsigned int req = ioq_get_avail(&fd->send);
269 res = write(fd->fd, fd->send.buf+fd->send.get, req);
275 log_module(MAIN_LOG, LOG_ERROR, "write() on fd %d error %d: %s", fd->fd, errno, strerror(errno));
279 if (fd->send.get == fd->send.size)
286 ioset_close(struct io_fd *fdp, int os_close) {
289 if (active_fd == fdp)
292 fdp->destroy_cb(fdp);
293 if (fdp->send.get != fdp->send.put) {
296 flags = fcntl(fdp->fd, F_GETFL);
297 fcntl(fdp->fd, F_SETFL, flags&~O_NONBLOCK);
298 ioset_try_write(fdp);
299 /* it may need to send the beginning of the buffer now.. */
300 if (fdp->send.get != fdp->send.put)
301 ioset_try_write(fdp);
312 ioset_accept(struct io_fd *listener)
314 struct io_fd *old_active_fd;
315 struct io_fd *new_fd;
318 fd = accept(listener->fd, NULL, 0);
320 log_module(MAIN_LOG, LOG_ERROR, "Unable to accept new connection on listener %d: %s", listener->fd, strerror(errno));
324 new_fd = ioset_add(fd);
325 new_fd->state = IO_CONNECTED;
326 old_active_fd = active_fd;
328 listener->accept_cb(listener, new_fd);
329 assert(active_fd == NULL || active_fd == new_fd);
330 if (active_fd == new_fd) {
331 if (new_fd->send.get != new_fd->send.put)
332 ioset_try_write(new_fd);
334 engine->update(new_fd);
336 active_fd = old_active_fd;
340 ioset_find_line_length(struct io_fd *fd) {
341 unsigned int pos, max, len;
343 max = (fd->recv.put < fd->recv.get) ? fd->recv.size : fd->recv.put;
344 for (pos = fd->recv.get; pos < max; ++pos, ++len)
345 if (IS_EOL(fd->recv.buf[pos]))
346 return fd->line_len = len + 1;
347 if (fd->recv.put < fd->recv.get)
348 for (pos = 0; pos < fd->recv.put; ++pos, ++len)
349 if (IS_EOL(fd->recv.buf[pos]))
350 return fd->line_len = len + 1;
351 return fd->line_len = 0;
355 ioset_buffered_read(struct io_fd *fd) {
356 int put_avail, nbr, fdnum;
358 if (!(put_avail = ioq_put_avail(&fd->recv)))
359 put_avail = ioq_grow(&fd->recv);
360 nbr = read(fd->fd, fd->recv.buf + fd->recv.put, put_avail);
366 log_module(MAIN_LOG, LOG_ERROR, "Unexpected read() error %d on fd %d: %s", errno, fd->fd, strerror(errno));
367 /* Just flag it as EOF and call readable_cb() to notify the fd's owner. */
368 fd->state = IO_CLOSED;
373 } else if (nbr == 0) {
374 fd->state = IO_CLOSED;
379 if (fd->line_len == 0) {
381 for (pos = fd->recv.put; pos < fd->recv.put + nbr; ++pos) {
382 if (IS_EOL(fd->recv.buf[pos])) {
383 if (fd->recv.put < fd->recv.get)
384 fd->line_len = fd->recv.size + pos + 1 - fd->recv.get;
386 fd->line_len = pos + 1 - fd->recv.get;
392 if (fd->recv.put == fd->recv.size)
395 while (fd->wants_reads && (fd->line_len > 0)) {
396 struct io_fd *old_active;
398 old_active = active_fd;
402 ioset_find_line_length(fd);
403 if (old_active != fd)
404 active_fd = old_active;
410 ioset_line_read(struct io_fd *fd, char *dest, int max) {
412 if ((fd->state == IO_CLOSED) && (!ioq_get_avail(&fd->recv) || (fd->line_len < 0)))
414 if (fd->line_len < 0)
416 if (fd->line_len < max)
418 avail = ioq_get_avail(&fd->recv);
420 memcpy(dest, fd->recv.buf + fd->recv.get, avail);
421 fd->recv.get += avail;
422 assert(fd->recv.get == fd->recv.size);
428 memcpy(dest + done, fd->recv.buf + fd->recv.get, max - done);
429 fd->recv.get += max - done;
430 if (fd->recv.get == fd->recv.size)
433 ioset_find_line_length(fd);
438 ioset_events(struct io_fd *fd, int readable, int writable)
440 if (!fd || (!readable && !writable))
447 if (active_fd && readable)
451 assert(active_fd == NULL || active_fd == fd);
452 if (active_fd && writable) {
456 if (getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &rc, &arglen) < 0)
458 fd->state = IO_CONNECTED;
460 fd->connect_cb(fd, rc);
464 /* and fall through */
466 assert(active_fd == NULL || active_fd == fd);
467 if (active_fd && readable) {
469 ioset_buffered_read(fd);
474 assert(active_fd == NULL || active_fd == fd);
475 if (active_fd && writable)
483 extern struct io_fd *socket_io_fd;
484 struct timeval timeout;
487 while (!quit_services) {
488 while (!socket_io_fd)
491 /* How long to sleep? (fill in select_timeout) */
492 wakey = timeq_next();
493 if ((wakey - now) < 0)
496 timeout.tv_sec = wakey - now;
499 if (engine->loop(&timeout))
502 /* Call any timeq events we need to call. */
509 extern char *services_config;
510 conf_read(services_config);
517 ioset_write(struct io_fd *fd, const char *buf, unsigned int nbw) {
519 while (ioq_used(&fd->send) + nbw >= fd->send.size)
521 avail = ioq_put_avail(&fd->send);
523 memcpy(fd->send.buf + fd->send.put, buf, avail);
528 memcpy(fd->send.buf + fd->send.put, buf, nbw);
530 if (fd->send.put == fd->send.size)
536 ioset_printf(struct io_fd *fd, const char *fmt, ...) {
542 res = vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap);
544 if (res > 0 && (size_t)res <= sizeof(tmpbuf))
545 ioset_write(fd, tmpbuf, res);
550 ioset_set_time(unsigned long new_now) {
551 clock_skew = new_now - time(NULL);