2 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
4 * Copyright (C) 2010 Steven Barth <steven@midlink.org>
6 * This program 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 this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
23 #include <sys/types.h>
28 #include <sys/event.h>
31 #include <sys/epoll.h>
45 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
47 #define ULOOP_MAX_EVENTS 10
49 static struct uloop_timeout *first_timeout;
50 static int poll_fd = -1;
51 bool uloop_cancelled = false;
68 static uint16_t get_flags(unsigned int flags, unsigned int mask)
76 if (flags & ULOOP_EDGE_TRIGGER)
82 static int register_poll(struct uloop_fd *fd, unsigned int flags)
84 struct timespec timeout = { 0, 0 };
89 changed = fd->kqflags ^ flags;
90 if (changed & ULOOP_EDGE_TRIGGER)
93 if (changed & ULOOP_READ) {
94 uint16_t kflags = get_flags(flags, ULOOP_READ);
95 EV_SET(&ev[nev++], fd->fd, EVFILT_READ, kflags, 0, 0, fd);
98 if (changed & ULOOP_WRITE) {
99 uint16_t kflags = get_flags(flags, ULOOP_WRITE);
100 EV_SET(&ev[nev++], fd->fd, EVFILT_WRITE, kflags, 0, 0, fd);
103 if (nev && (kevent(poll_fd, ev, nev, NULL, 0, &timeout) == -1))
110 int uloop_fd_delete(struct uloop_fd *sock)
112 sock->registered = false;
113 return register_poll(sock, 0);
116 static void uloop_run_events(int timeout)
118 struct kevent events[ULOOP_MAX_EVENTS];
123 ts.tv_sec = timeout / 1000;
124 ts.tv_nsec = (timeout % 1000) * 1000000;
127 nfds = kevent(poll_fd, NULL, 0, events, ARRAY_SIZE(events), timeout > 0 ? &ts : NULL);
128 for(n = 0; n < nfds; ++n)
130 struct uloop_fd *u = events[n].udata;
133 if(events[n].flags & EV_ERROR) {
138 if(events[n].filter == EVFILT_READ)
140 else if (events[n].filter == EVFILT_WRITE)
143 if(events[n].flags & EV_EOF)
158 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
161 #define EPOLLRDHUP 0x2000
169 poll_fd = epoll_create(32);
173 fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
177 static int register_poll(struct uloop_fd *fd, unsigned int flags)
179 struct epoll_event ev;
180 int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
182 memset(&ev, 0, sizeof(struct epoll_event));
184 if (flags & ULOOP_READ)
185 ev.events |= EPOLLIN | EPOLLRDHUP;
187 if (flags & ULOOP_WRITE)
188 ev.events |= EPOLLOUT;
190 if (flags & ULOOP_EDGE_TRIGGER)
191 ev.events |= EPOLLET;
196 return epoll_ctl(poll_fd, op, fd->fd, &ev);
199 int uloop_fd_delete(struct uloop_fd *sock)
201 sock->registered = false;
202 return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
205 static void uloop_run_events(int timeout)
207 struct epoll_event events[ULOOP_MAX_EVENTS];
210 nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
211 for(n = 0; n < nfds; ++n)
213 struct uloop_fd *u = events[n].data.ptr;
216 if(events[n].events & EPOLLERR) {
221 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR)))
224 if(events[n].events & EPOLLRDHUP)
227 if(events[n].events & EPOLLIN)
230 if(events[n].events & EPOLLOUT)
240 int uloop_fd_add(struct uloop_fd *sock, unsigned int flags)
245 if (!sock->registered && !(flags & ULOOP_BLOCKING)) {
246 fl = fcntl(sock->fd, F_GETFL, 0);
248 fcntl(sock->fd, F_SETFL, fl);
251 ret = register_poll(sock, flags);
255 sock->registered = true;
262 static int tv_diff(struct timeval *t1, struct timeval *t2)
264 if (t1->tv_sec != t2->tv_sec)
265 return (t1->tv_sec - t2->tv_sec) * 1000;
267 return (t1->tv_usec - t2->tv_usec) / 1000;
270 int uloop_timeout_add(struct uloop_timeout *timeout)
272 struct uloop_timeout **head = &first_timeout;
273 struct uloop_timeout *prev = NULL;
275 if (timeout->pending)
279 if (tv_diff(&(*head)->time, &timeout->time) > 0)
283 head = &(*head)->next;
286 timeout->prev = prev;
287 timeout->next = *head;
289 timeout->next->prev = timeout;
291 timeout->pending = true;
296 int uloop_timeout_set(struct uloop_timeout *timeout, int msecs)
298 struct timeval *time = &timeout->time;
300 if (timeout->pending)
301 uloop_timeout_cancel(timeout);
303 gettimeofday(&timeout->time, NULL);
305 time->tv_sec += msecs / 1000;
306 time->tv_usec += msecs % 1000;
308 if (time->tv_usec > 1000000) {
310 time->tv_usec %= 100000;
313 return uloop_timeout_add(timeout);
316 int uloop_timeout_cancel(struct uloop_timeout *timeout)
318 if (!timeout->pending)
322 timeout->prev->next = timeout->next;
324 first_timeout = timeout->next;
327 timeout->next->prev = timeout->prev;
329 timeout->pending = false;
334 static void uloop_handle_sigint(int signo)
336 uloop_cancelled = true;
339 static void uloop_setup_signals(void)
342 memset(&s, 0, sizeof(struct sigaction));
343 s.sa_handler = uloop_handle_sigint;
345 sigaction(SIGINT, &s, NULL);
348 static int uloop_get_next_timeout(struct timeval *tv)
355 diff = tv_diff(&first_timeout->time, tv);
362 static void uloop_process_timeouts(struct timeval *tv)
364 struct uloop_timeout *timeout;
366 while (first_timeout) {
367 if (tv_diff(&first_timeout->time, tv) > 0)
370 timeout = first_timeout;
371 uloop_timeout_cancel(timeout);
373 timeout->cb(timeout);
381 uloop_setup_signals();
382 while(!uloop_cancelled)
384 gettimeofday(&tv, NULL);
385 uloop_process_timeouts(&tv);
388 uloop_run_events(uloop_get_next_timeout(&tv));
392 void uloop_done(void)