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>
38 #include <sys/event.h>
41 #include <sys/epoll.h>
45 #define ULOOP_MAX_EVENTS 10
47 static struct list_head timeouts = LIST_HEAD_INIT(timeouts);
48 static struct list_head processes = LIST_HEAD_INIT(processes);
50 static int poll_fd = -1;
51 bool uloop_cancelled = false;
52 bool uloop_handle_sigchld = true;
53 static bool do_sigchld = false;
54 static int cur_fd, cur_nfds;
60 struct timespec timeout = { 0, 0 };
61 struct kevent ev = {};
70 EV_SET(&ev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, 0);
71 kevent(poll_fd, &ev, 1, NULL, 0, &timeout);
77 static uint16_t get_flags(unsigned int flags, unsigned int mask)
85 if (flags & ULOOP_EDGE_TRIGGER)
91 static struct kevent events[ULOOP_MAX_EVENTS];
93 static int register_poll(struct uloop_fd *fd, unsigned int flags)
95 struct timespec timeout = { 0, 0 };
101 kflags = get_flags(flags, ULOOP_READ);
102 EV_SET(&ev[nev++], fd->fd, EVFILT_READ, kflags, 0, 0, fd);
104 kflags = get_flags(flags, ULOOP_WRITE);
105 EV_SET(&ev[nev++], fd->fd, EVFILT_WRITE, kflags, 0, 0, fd);
110 if (nev && (kevent(poll_fd, ev, nev, NULL, fl, &timeout) == -1))
116 int uloop_fd_delete(struct uloop_fd *sock)
120 for (i = cur_fd + 1; i < cur_nfds; i++) {
121 if (events[i].udata != sock)
124 events[i].udata = NULL;
127 sock->registered = false;
128 return register_poll(sock, 0);
131 static void uloop_run_events(int timeout)
137 ts.tv_sec = timeout / 1000;
138 ts.tv_nsec = (timeout % 1000) * 1000000;
141 nfds = kevent(poll_fd, NULL, 0, events, ARRAY_SIZE(events), timeout >= 0 ? &ts : NULL);
142 for(n = 0; n < nfds; ++n)
144 struct uloop_fd *u = events[n].udata;
150 if (events[n].flags & EV_ERROR) {
155 if(events[n].filter == EVFILT_READ)
157 else if (events[n].filter == EVFILT_WRITE)
160 if (events[n].flags & EV_EOF)
179 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
182 #define EPOLLRDHUP 0x2000
190 poll_fd = epoll_create(32);
194 fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
198 static int register_poll(struct uloop_fd *fd, unsigned int flags)
200 struct epoll_event ev;
201 int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
203 memset(&ev, 0, sizeof(struct epoll_event));
205 if (flags & ULOOP_READ)
206 ev.events |= EPOLLIN | EPOLLRDHUP;
208 if (flags & ULOOP_WRITE)
209 ev.events |= EPOLLOUT;
211 if (flags & ULOOP_EDGE_TRIGGER)
212 ev.events |= EPOLLET;
217 return epoll_ctl(poll_fd, op, fd->fd, &ev);
220 static struct epoll_event events[ULOOP_MAX_EVENTS];
222 int uloop_fd_delete(struct uloop_fd *sock)
226 for (i = cur_fd + 1; i < cur_nfds; i++) {
227 if (events[i].data.ptr != sock)
230 events[i].data.ptr = NULL;
232 sock->registered = false;
233 return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
236 static void uloop_run_events(int timeout)
240 nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
241 for(n = 0; n < nfds; ++n)
243 struct uloop_fd *u = events[n].data.ptr;
249 if(events[n].events & (EPOLLERR|EPOLLHUP)) {
254 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)))
257 if(events[n].events & EPOLLRDHUP)
260 if(events[n].events & EPOLLIN)
263 if(events[n].events & EPOLLOUT)
277 int uloop_fd_add(struct uloop_fd *sock, unsigned int flags)
282 if (!sock->registered && !(flags & ULOOP_BLOCKING)) {
283 fl = fcntl(sock->fd, F_GETFL, 0);
285 fcntl(sock->fd, F_SETFL, fl);
288 ret = register_poll(sock, flags);
292 sock->registered = true;
299 static int tv_diff(struct timeval *t1, struct timeval *t2)
302 (t1->tv_sec - t2->tv_sec) * 1000 +
303 (t1->tv_usec - t2->tv_usec) / 1000;
306 int uloop_timeout_add(struct uloop_timeout *timeout)
308 struct uloop_timeout *tmp;
309 struct list_head *h = &timeouts;
311 if (timeout->pending)
314 list_for_each_entry(tmp, &timeouts, list) {
315 if (tv_diff(&tmp->time, &timeout->time) > 0) {
321 list_add_tail(&timeout->list, h);
322 timeout->pending = true;
327 int uloop_timeout_set(struct uloop_timeout *timeout, int msecs)
329 struct timeval *time = &timeout->time;
331 if (timeout->pending)
332 uloop_timeout_cancel(timeout);
334 gettimeofday(&timeout->time, NULL);
336 time->tv_sec += msecs / 1000;
337 time->tv_usec += (msecs % 1000) * 1000;
339 if (time->tv_usec > 1000000) {
341 time->tv_usec %= 1000000;
344 return uloop_timeout_add(timeout);
347 int uloop_timeout_cancel(struct uloop_timeout *timeout)
349 if (!timeout->pending)
352 list_del(&timeout->list);
353 timeout->pending = false;
358 int uloop_process_add(struct uloop_process *p)
360 struct uloop_process *tmp;
361 struct list_head *h = &processes;
366 list_for_each_entry(tmp, &processes, list) {
367 if (tmp->pid > p->pid) {
373 list_add_tail(&p->list, h);
379 int uloop_process_delete(struct uloop_process *p)
390 static void uloop_handle_processes(void)
392 struct uloop_process *p, *tmp;
399 pid = waitpid(-1, &ret, WNOHANG);
403 list_for_each_entry_safe(p, tmp, &processes, list) {
410 uloop_process_delete(p);
417 static void uloop_handle_sigint(int signo)
419 uloop_cancelled = true;
422 static void uloop_sigchld(int signo)
427 static void uloop_setup_signals(void)
431 memset(&s, 0, sizeof(struct sigaction));
432 s.sa_handler = uloop_handle_sigint;
434 sigaction(SIGINT, &s, NULL);
436 if (uloop_handle_sigchld) {
437 s.sa_handler = uloop_sigchld;
438 sigaction(SIGCHLD, &s, NULL);
442 static int uloop_get_next_timeout(struct timeval *tv)
444 struct uloop_timeout *timeout;
447 if (list_empty(&timeouts))
450 timeout = list_first_entry(&timeouts, struct uloop_timeout, list);
451 diff = tv_diff(&timeout->time, tv);
458 static void uloop_process_timeouts(struct timeval *tv)
460 struct uloop_timeout *t;
462 while (!list_empty(&timeouts)) {
463 t = list_first_entry(&timeouts, struct uloop_timeout, list);
465 if (tv_diff(&t->time, tv) > 0)
468 uloop_timeout_cancel(t);
474 static void uloop_clear_timeouts(void)
476 struct uloop_timeout *t, *tmp;
478 list_for_each_entry_safe(t, tmp, &timeouts, list)
479 uloop_timeout_cancel(t);
482 static void uloop_clear_processes(void)
484 struct uloop_process *p, *tmp;
486 list_for_each_entry_safe(p, tmp, &processes, list)
487 uloop_process_delete(p);
494 uloop_setup_signals();
495 while(!uloop_cancelled)
497 gettimeofday(&tv, NULL);
498 uloop_process_timeouts(&tv);
503 uloop_handle_processes();
504 uloop_run_events(uloop_get_next_timeout(&tv));
508 void uloop_done(void)
516 uloop_clear_timeouts();
517 uloop_clear_processes();