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;
36 ret = read(fd->fd, &fdsi, sizeof(fdsi));
37 if (ret < 0 && errno == EINTR)
40 if (ret != sizeof(fdsi))
43 switch (fdsi.ssi_signo) {
47 sigaction(fdsi.ssi_signo, NULL, &act);
48 if (act.sa_handler != SIG_IGN &&
49 act.sa_handler != SIG_DFL) {
50 act.sa_handler(fdsi.ssi_signo);
56 uloop_handle_signal(fdsi.ssi_signo);
62 uloop_setup_signalfd(bool add)
64 static struct uloop_fd sfd = {
65 .cb = uloop_signal_fd_cb
67 static sigset_t prev_mask;
76 uloop_fd_delete(&sfd);
77 sigprocmask(SIG_BLOCK, &prev_mask, NULL);
79 sigaddset(&mask, SIGQUIT);
80 sigaddset(&mask, SIGINT);
81 sigaddset(&mask, SIGTERM);
82 sigaddset(&mask, SIGCHLD);
83 sigprocmask(SIG_BLOCK, &mask, &prev_mask);
86 uloop_fd_add(&sfd, ULOOP_READ | ULOOP_EDGE_TRIGGER);
89 if (signalfd(signal_fd, &mask, SFD_NONBLOCK | SFD_CLOEXEC) < 0) {
90 sigprocmask(SIG_BLOCK, &prev_mask, NULL);
104 poll_fd = epoll_create(32);
108 fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
111 signal_fd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
116 static int register_poll(struct uloop_fd *fd, unsigned int flags)
118 struct epoll_event ev;
119 int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
121 memset(&ev, 0, sizeof(struct epoll_event));
123 if (flags & ULOOP_READ)
124 ev.events |= EPOLLIN | EPOLLRDHUP;
126 if (flags & ULOOP_WRITE)
127 ev.events |= EPOLLOUT;
129 if (flags & ULOOP_EDGE_TRIGGER)
130 ev.events |= EPOLLET;
136 return epoll_ctl(poll_fd, op, fd->fd, &ev);
139 static struct epoll_event events[ULOOP_MAX_EVENTS];
141 static int __uloop_fd_delete(struct uloop_fd *sock)
144 return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
147 static int uloop_fetch_events(int timeout)
151 nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
152 for (n = 0; n < nfds; ++n) {
153 struct uloop_fd_event *cur = &cur_fds[n];
154 struct uloop_fd *u = events[n].data.ptr;
161 if (events[n].events & (EPOLLERR|EPOLLHUP)) {
163 if (!(u->flags & ULOOP_ERROR_CB))
167 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
172 if(events[n].events & EPOLLRDHUP)
175 if(events[n].events & EPOLLIN)
178 if(events[n].events & EPOLLOUT)