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.
18 static int uloop_init_pollfd(void)
20 struct timespec timeout = { 0, 0 };
21 struct kevent ev = {};
30 EV_SET(&ev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, 0);
31 kevent(poll_fd, &ev, 1, NULL, 0, &timeout);
37 static uint16_t get_flags(unsigned int flags, unsigned int mask)
45 if (flags & ULOOP_EDGE_TRIGGER)
51 static struct kevent events[ULOOP_MAX_EVENTS];
53 static int register_kevent(struct uloop_fd *fd, unsigned int flags)
55 struct timespec timeout = { 0, 0 };
62 if (flags & ULOOP_EDGE_DEFER)
63 flags &= ~ULOOP_EDGE_TRIGGER;
65 changed = flags ^ fd->flags;
66 if (changed & ULOOP_EDGE_TRIGGER)
69 if (changed & ULOOP_READ) {
70 kflags = get_flags(flags, ULOOP_READ);
71 EV_SET(&ev[nev++], fd->fd, EVFILT_READ, kflags, 0, 0, fd);
74 if (changed & ULOOP_WRITE) {
75 kflags = get_flags(flags, ULOOP_WRITE);
76 EV_SET(&ev[nev++], fd->fd, EVFILT_WRITE, kflags, 0, 0, fd);
83 if (kevent(poll_fd, ev, nev, NULL, fl, &timeout) == -1)
89 static int register_poll(struct uloop_fd *fd, unsigned int flags)
91 if (flags & ULOOP_EDGE_TRIGGER)
92 flags |= ULOOP_EDGE_DEFER;
94 flags &= ~ULOOP_EDGE_DEFER;
96 return register_kevent(fd, flags);
99 static int __uloop_fd_delete(struct uloop_fd *fd)
101 return register_poll(fd, 0);
104 static int uloop_fetch_events(int timeout)
110 ts.tv_sec = timeout / 1000;
111 ts.tv_nsec = (timeout % 1000) * 1000000;
114 nfds = kevent(poll_fd, NULL, 0, events, ARRAY_SIZE(events), timeout >= 0 ? &ts : NULL);
115 for (n = 0; n < nfds; n++) {
116 struct uloop_fd_event *cur = &cur_fds[n];
117 struct uloop_fd *u = events[n].udata;
124 if (events[n].flags & EV_ERROR) {
126 if (!(u->flags & ULOOP_ERROR_CB))
130 if(events[n].filter == EVFILT_READ)
132 else if (events[n].filter == EVFILT_WRITE)
135 if (events[n].flags & EV_EOF)
141 if (u->flags & ULOOP_EDGE_DEFER) {
142 u->flags &= ~ULOOP_EDGE_DEFER;
143 u->flags |= ULOOP_EDGE_TRIGGER;
144 register_kevent(u, u->flags);