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>
24 #include <sys/epoll.h>
39 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
42 #define EPOLLRDHUP 0x2000
46 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
49 struct uloop_timeout *first_timeout;
53 int uloop_fd_add(struct uloop_fd *sock, unsigned int flags)
55 struct epoll_event ev;
56 int op = sock->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
60 if (!sock->registered) {
61 fl = fcntl(sock->fd, F_GETFL, 0);
63 fcntl(sock->fd, F_SETFL, fl);
66 memset(&ev, 0, sizeof(struct epoll_event));
68 if (flags & ULOOP_READ)
69 ev.events |= EPOLLIN | EPOLLRDHUP;
71 if (flags & ULOOP_WRITE)
72 ev.events |= EPOLLOUT;
74 if (flags & ULOOP_EDGE_TRIGGER)
77 ev.data.fd = sock->fd;
80 ret = epoll_ctl(epoll_fd, op, sock->fd, &ev);
84 sock->registered = true;
91 int uloop_fd_delete(struct uloop_fd *sock)
93 sock->registered = false;
94 return epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock->fd, 0);
97 static int tv_diff(struct timeval *t1, struct timeval *t2)
99 if (t1->tv_sec != t2->tv_sec)
100 return (t1->tv_sec - t2->tv_sec) * 1000;
102 return (t1->tv_usec - t2->tv_usec) / 1000;
105 int uloop_timeout_add(struct uloop_timeout *timeout)
107 struct uloop_timeout **head = &first_timeout;
108 struct uloop_timeout *prev = NULL;
110 if (timeout->pending)
114 if (tv_diff(&(*head)->time, &timeout->time) > 0)
118 head = &(*head)->next;
121 timeout->prev = prev;
122 timeout->next = *head;
124 timeout->next->prev = timeout;
126 timeout->pending = true;
131 int uloop_timeout_set(struct uloop_timeout *timeout, int msecs)
133 struct timeval *time = &timeout->time;
135 if (timeout->pending)
136 uloop_timeout_cancel(timeout);
138 gettimeofday(&timeout->time, NULL);
140 time->tv_sec += msecs / 1000;
141 time->tv_usec += msecs % 1000;
143 if (time->tv_usec > 1000000) {
145 time->tv_usec %= 100000;
148 return uloop_timeout_add(timeout);
151 int uloop_timeout_cancel(struct uloop_timeout *timeout)
153 if (!timeout->pending)
157 timeout->prev->next = timeout->next;
159 first_timeout = timeout->next;
162 timeout->next->prev = timeout->prev;
164 timeout->pending = false;
169 static void uloop_handle_sigint(int signo)
174 static void uloop_setup_signals(void)
177 memset(&s, 0, sizeof(struct sigaction));
178 s.sa_handler = uloop_handle_sigint;
180 sigaction(SIGINT, &s, NULL);
183 static int uloop_get_next_timeout(struct timeval *tv)
190 diff = tv_diff(&first_timeout->time, tv);
197 static void uloop_process_timeouts(struct timeval *tv)
199 struct uloop_timeout *timeout;
201 while (first_timeout) {
202 if (tv_diff(&first_timeout->time, tv) > 0)
205 timeout = first_timeout;
206 uloop_timeout_cancel(timeout);
208 timeout->cb(timeout);
219 epoll_fd = epoll_create(32);
223 fcntl(epoll_fd, F_SETFD, fcntl(epoll_fd, F_GETFD) | FD_CLOEXEC);
229 struct epoll_event events[10];
234 uloop_setup_signals();
237 gettimeofday(&tv, NULL);
238 uloop_process_timeouts(&tv);
239 timeout = uloop_get_next_timeout(&tv);
240 nfds = epoll_wait(epoll_fd, events, ARRAY_SIZE(events), timeout);
241 for(n = 0; n < nfds; ++n)
243 struct uloop_fd *u = events[n].data.ptr;
246 if(events[n].events & EPOLLERR) {
251 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR)))
254 if(events[n].events & EPOLLRDHUP)
257 if(events[n].events & EPOLLIN)
260 if(events[n].events & EPOLLOUT)
269 void uloop_done(void)