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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <poll.h>
#include <sys/select.h>
#include <stdio.h>
#include "common/common.h"
#include "config.h"
#include "poll_wrapper.h"
#include "timer.h"
int mp_poll(struct pollfd *fds, int nfds, int64_t timeout_ns)
{
#if HAVE_PPOLL
struct timespec ts;
ts.tv_sec = timeout_ns / MP_TIME_S_TO_NS(1);
ts.tv_nsec = timeout_ns % MP_TIME_S_TO_NS(1);
struct timespec *tsp = timeout_ns >= 0 ? &ts : NULL;
return ppoll(fds, nfds, tsp, NULL);
#endif
// Round-up to 1ms for short timeouts (100us, 1000us]
if (timeout_ns > MP_TIME_US_TO_NS(100))
timeout_ns = MPMAX(timeout_ns, MP_TIME_MS_TO_NS(1));
if (timeout_ns > 0)
timeout_ns /= MP_TIME_MS_TO_NS(1);
return poll(fds, nfds, timeout_ns);
}
// poll shim that supports device files on macOS.
int polldev(struct pollfd fds[], nfds_t nfds, int timeout)
{
#ifdef __APPLE__
int maxfd = 0;
fd_set readfds, writefds;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
for (size_t i = 0; i < nfds; ++i) {
struct pollfd *fd = &fds[i];
if (fd->fd > maxfd) {
maxfd = fd->fd;
}
if ((fd->events & POLLIN)) {
FD_SET(fd->fd, &readfds);
}
if ((fd->events & POLLOUT)) {
FD_SET(fd->fd, &writefds);
}
}
struct timeval _timeout = {
.tv_sec = timeout / 1000,
.tv_usec = (timeout % 1000) * 1000
};
int n = select(maxfd + 1, &readfds, &writefds, NULL,
timeout != -1 ? &_timeout : NULL);
if (n < 0) {
return n;
}
for (size_t i = 0; i < nfds; ++i) {
struct pollfd *fd = &fds[i];
fd->revents = 0;
if (FD_ISSET(fd->fd, &readfds)) {
fd->revents |= POLLIN;
}
if (FD_ISSET(fd->fd, &writefds)) {
fd->revents |= POLLOUT;
}
}
return n;
#else
return poll(fds, nfds, timeout);
#endif
}
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