Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | /* * 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; 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; } static void dispatch_timer(struct uloop_fd *u, unsigned int events) { if (!(events & ULOOP_READ)) return; uint64_t fired; if (read(u->fd, &fired, sizeof(fired)) != sizeof(fired)) return; struct uloop_interval *tm = container_of(u, struct uloop_interval, priv.ufd); tm->expirations += fired; tm->cb(tm); } static int timer_register(struct uloop_interval *tm, unsigned int msecs) { if (!tm->priv.ufd.registered) { int fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC|TFD_NONBLOCK); if (fd == -1) return -1; tm->priv.ufd.fd = fd; tm->priv.ufd.cb = dispatch_timer; } struct itimerspec spec = { .it_value = { .tv_sec = msecs / 1000, .tv_nsec = (msecs % 1000) * 1000000 }, .it_interval = { .tv_sec = msecs / 1000, .tv_nsec = (msecs % 1000) * 1000000 } }; if (timerfd_settime(tm->priv.ufd.fd, 0, &spec, NULL) == -1) goto err; if (uloop_fd_add(&tm->priv.ufd, ULOOP_READ) == -1) goto err; return 0; err: uloop_fd_delete(&tm->priv.ufd); close(tm->priv.ufd.fd); memset(&tm->priv.ufd, 0, sizeof(tm->priv.ufd)); return -1; } static int timer_remove(struct uloop_interval *tm) { int ret = __uloop_fd_delete(&tm->priv.ufd); if (ret == 0) { close(tm->priv.ufd.fd); memset(&tm->priv.ufd, 0, sizeof(tm->priv.ufd)); } return ret; } static int64_t timer_next(struct uloop_interval *tm) { struct itimerspec spec; if (!tm->priv.ufd.registered) return -1; if (timerfd_gettime(tm->priv.ufd.fd, &spec) == -1) return -1; return spec.it_value.tv_sec * 1000 + spec.it_value.tv_nsec / 1000000; } |