2 * uloop - event loop implementation
4 * Copyright (C) 2010-2016 Felix Fietkau <nbd@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
23 #define EPOLLRDHUP 0x2000
31 poll_fd = epoll_create(32);
35 fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
39 static int register_poll(struct uloop_fd *fd, unsigned int flags)
41 struct epoll_event ev;
42 int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
44 memset(&ev, 0, sizeof(struct epoll_event));
46 if (flags & ULOOP_READ)
47 ev.events |= EPOLLIN | EPOLLRDHUP;
49 if (flags & ULOOP_WRITE)
50 ev.events |= EPOLLOUT;
52 if (flags & ULOOP_EDGE_TRIGGER)
59 return epoll_ctl(poll_fd, op, fd->fd, &ev);
62 static struct epoll_event events[ULOOP_MAX_EVENTS];
64 static int __uloop_fd_delete(struct uloop_fd *sock)
67 return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
70 static int uloop_fetch_events(int timeout)
74 nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
75 for (n = 0; n < nfds; ++n) {
76 struct uloop_fd_event *cur = &cur_fds[n];
77 struct uloop_fd *u = events[n].data.ptr;
84 if (events[n].events & (EPOLLERR|EPOLLHUP)) {
86 if (!(u->flags & ULOOP_ERROR_CB))
90 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
95 if(events[n].events & EPOLLRDHUP)
98 if(events[n].events & EPOLLIN)
101 if(events[n].events & EPOLLOUT)