Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* uloop - event loop implementation
*
* Copyright (C) 2010-2016 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
*/
#ifndef EPOLLRDHUP
#define EPOLLRDHUP 0x2000
#endif
static int uloop_init_pollfd(void)
{
if (poll_fd >= 0)
return 0;
poll_fd = epoll_create(32);
if (poll_fd < 0)
return -1;
fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
return 0;
}
static int register_poll(struct uloop_fd *fd, unsigned int flags)
{
struct epoll_event ev;
int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
memset(&ev, 0, sizeof(struct epoll_event));
if (flags & ULOOP_READ)
ev.events |= EPOLLIN | EPOLLRDHUP;
if (flags & ULOOP_WRITE)
ev.events |= EPOLLOUT;
if (flags & ULOOP_EDGE_TRIGGER)
ev.events |= EPOLLET;
ev.data.ptr = fd;
fd->flags = flags;
return epoll_ctl(poll_fd, op, fd->fd, &ev);
}
static struct epoll_event events[ULOOP_MAX_EVENTS];
static int __uloop_fd_delete(struct uloop_fd *sock)
{
sock->flags = 0;
return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
}
static int uloop_fetch_events(int timeout)
{
int n, nfds;
nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
for (n = 0; n < nfds; ++n) {
struct uloop_fd_event *cur = &cur_fds[n];
struct uloop_fd *u = events[n].data.ptr;
unsigned int ev = 0;
cur->fd = u;
if (!u)
continue;
if (events[n].events & (EPOLLERR|EPOLLHUP)) {
u->error = true;
if (!(u->flags & ULOOP_ERROR_CB))
uloop_fd_delete(u);
}
if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
cur->fd = NULL;
continue;
}
if(events[n].events & EPOLLRDHUP)
u->eof = true;
if(events[n].events & EPOLLIN)
ev |= ULOOP_READ;
if(events[n].events & EPOLLOUT)
ev |= ULOOP_WRITE;
cur->events = ev;
}
return nfds;
}