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Sources/libubox/uloop-epoll.c

  1 /*
  2  * uloop - event loop implementation
  3  *
  4  * Copyright (C) 2010-2016 Felix Fietkau <nbd@openwrt.org>
  5  *
  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.
  9  *
 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.
 17  */
 18 
 19 /**
 20  * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
 21  */
 22 #ifndef EPOLLRDHUP
 23 #define EPOLLRDHUP 0x2000
 24 #endif
 25 
 26 static int uloop_init_pollfd(void)
 27 {
 28         if (poll_fd >= 0)
 29                 return 0;
 30 
 31         poll_fd = epoll_create(32);
 32         if (poll_fd < 0)
 33                 return -1;
 34 
 35         fcntl(poll_fd, F_SETFD, fcntl(poll_fd, F_GETFD) | FD_CLOEXEC);
 36         return 0;
 37 }
 38 
 39 static int register_poll(struct uloop_fd *fd, unsigned int flags)
 40 {
 41         struct epoll_event ev;
 42         int op = fd->registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
 43 
 44         memset(&ev, 0, sizeof(struct epoll_event));
 45 
 46         if (flags & ULOOP_READ)
 47                 ev.events |= EPOLLIN | EPOLLRDHUP;
 48 
 49         if (flags & ULOOP_WRITE)
 50                 ev.events |= EPOLLOUT;
 51 
 52         if (flags & ULOOP_EDGE_TRIGGER)
 53                 ev.events |= EPOLLET;
 54 
 55         ev.data.ptr = fd;
 56         fd->flags = flags;
 57 
 58         return epoll_ctl(poll_fd, op, fd->fd, &ev);
 59 }
 60 
 61 static struct epoll_event events[ULOOP_MAX_EVENTS];
 62 
 63 static int __uloop_fd_delete(struct uloop_fd *sock)
 64 {
 65         sock->flags = 0;
 66         return epoll_ctl(poll_fd, EPOLL_CTL_DEL, sock->fd, 0);
 67 }
 68 
 69 static int uloop_fetch_events(int timeout)
 70 {
 71         int n, nfds;
 72 
 73         nfds = epoll_wait(poll_fd, events, ARRAY_SIZE(events), timeout);
 74         for (n = 0; n < nfds; ++n) {
 75                 struct uloop_fd_event *cur = &cur_fds[n];
 76                 struct uloop_fd *u = events[n].data.ptr;
 77                 unsigned int ev = 0;
 78 
 79                 cur->fd = u;
 80                 if (!u)
 81                         continue;
 82 
 83                 if (events[n].events & (EPOLLERR|EPOLLHUP)) {
 84                         u->error = true;
 85                         if (!(u->flags & ULOOP_ERROR_CB))
 86                                 uloop_fd_delete(u);
 87                 }
 88 
 89                 if(!(events[n].events & (EPOLLRDHUP|EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP))) {
 90                         cur->fd = NULL;
 91                         continue;
 92                 }
 93 
 94                 if(events[n].events & EPOLLRDHUP)
 95                         u->eof = true;
 96 
 97                 if(events[n].events & EPOLLIN)
 98                         ev |= ULOOP_READ;
 99 
100                 if(events[n].events & EPOLLOUT)
101                         ev |= ULOOP_WRITE;
102 
103                 cur->events = ev;
104         }
105 
106         return nfds;
107 }
108 

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