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.
19 #include <sys/signalfd.h>
22 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
25 #define EPOLLRDHUP 0x2000
29 uloop_signal_fd_cb(struct uloop_fd *fd, unsigned int events)
31 struct signalfd_siginfo fdsi;
35 ret = read(fd->fd, &fdsi, sizeof(fdsi));
36 if (ret < 0 && errno == EINTR)
39 if (ret != sizeof(fdsi))
42 uloop_handle_signal(fdsi.ssi_signo);
46 uloop_setup_signalfd(bool add)
48 static struct uloop_fd sfd = {
49 .cb = uloop_signal_fd_cb
51 static sigset_t prev_mask;
60 uloop_fd_delete(&sfd);
61 sigprocmask(SIG_SETMASK, &prev_mask, NULL);
63 sigaddset(&mask, SIGQUIT);
64 sigaddset(&mask, SIGINT);
65 sigaddset(&mask, SIGTERM);
66 sigaddset(&mask, SIGCHLD);
67 sigprocmask(SIG_BLOCK, &mask, &prev_mask);
70 uloop_fd_add(&sfd, ULOOP_READ | ULOOP_EDGE_TRIGGER);
73 if (signalfd(signal_fd, &mask, SFD_NONBLOCK | SFD_CLOEXEC) < 0) {
74 sigprocmask(SIG_BLOCK, &prev_mask, NULL);
88 poll_fd = epoll_create(32);
92 fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
95 signal_fd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
100 static int register_poll(struct uloop_fd *fd, unsigned int flags)
102 struct epoll_event ev;
103 int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
105 memset(&ev, 0, sizeof(struct epoll_event));
107 if (flags & ULOOP_READ)
108 ev.events |= EPOLLIN | EPOLLRDHUP;
110 if (flags & ULOOP_WRITE)
111 ev.events |= EPOLLOUT;
113 if (flags & ULOOP_EDGE_TRIGGER)
114 ev.events |= EPOLLET;
120 return epoll_ctl(poll_fd, op, fd->fd, &ev);
123 static struct epoll_event events[ULOOP_MAX_EVENTS];
125 static int __uloop_fd_delete(struct uloop_fd *sock)
128 return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
131 static int uloop_fetch_events(int timeout)
135 nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
136 for (n = 0; n < nfds; ++n) {
137 struct uloop_fd_event *cur = &cur_fds[n];
138 struct uloop_fd *u = events[n].data.ptr;
145 if (events[n].events & (EPOLLERR|EPOLLHUP)) {
147 if (!(u->flags & ULOOP_ERROR_CB))
151 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
156 if(events[n].events & EPOLLRDHUP)
159 if(events[n].events & EPOLLIN)
162 if(events[n].events & EPOLLOUT)