mirror of
https://github.com/mpv-player/mpv
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ba418132cd
This implements a poll-compatible interface, backed by select on macOS, suitable for polling on device files - which are not supported by macOS's implementation of poll. This is a (long-standing) bug in macOS, so hopefully we can eventually remove this shim.
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* poll shim that supports device files on macOS.
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <poll.h>
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#include <sys/select.h>
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#include <stdio.h>
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#include "osdep/polldev.h"
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int polldev(struct pollfd fds[], nfds_t nfds, int timeout) {
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#ifdef __APPLE__
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int maxfd = 0;
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fd_set readfds, writefds, errorfds;
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FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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FD_ZERO(&errorfds);
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for (size_t i = 0; i < nfds; ++i) {
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struct pollfd *fd = &fds[i];
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if (fd->fd > maxfd) {
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maxfd = fd->fd;
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}
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if ((fd->events & POLLIN)) {
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FD_SET(fd->fd, &readfds);
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}
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if ((fd->events & POLLOUT)) {
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FD_SET(fd->fd, &writefds);
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}
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if ((fd->events & POLLERR)) {
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FD_SET(fd->fd, &errorfds);
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}
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}
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struct timeval _timeout = {
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.tv_sec = timeout / 1000,
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.tv_usec = (timeout % 1000) * 1000
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};
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int n = select(maxfd + 1, &readfds, &writefds, &errorfds,
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timeout != -1 ? &_timeout : NULL);
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if (n < 0) {
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return n;
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}
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for (size_t i = 0; i < nfds; ++i) {
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struct pollfd *fd = &fds[i];
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fd->revents = 0;
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if (FD_ISSET(fd->fd, &readfds)) {
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fd->revents |= POLLIN;
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}
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if (FD_ISSET(fd->fd, &writefds)) {
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fd->revents |= POLLOUT;
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}
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if (FD_ISSET(fd->fd, &errorfds)) {
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fd->revents |= POLLERR;
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}
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}
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return n;
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#else
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return poll(fds, nfds, timeout);
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#endif
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}
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