mirror of https://github.com/mpv-player/mpv
150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/*
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* This file is part of mpv.
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*
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* by rr- <rr-@sakuya.pl>
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/vt.h>
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#include <unistd.h>
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#include "drm_common.h"
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#include "common/common.h"
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#include "common/msg.h"
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#include "osdep/io.h"
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#define EVT_RELEASE 1
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#define EVT_ACQUIRE 2
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#define EVT_INTERRUPT 255
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#define HANDLER_ACQUIRE 0
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#define HANDLER_RELEASE 1
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static int vt_switcher_pipe[2];
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static void vt_switcher_sighandler(int sig)
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{
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unsigned char event = sig == SIGUSR1 ? EVT_RELEASE : EVT_ACQUIRE;
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write(vt_switcher_pipe[1], &event, sizeof(event));
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}
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int vt_switcher_init(struct vt_switcher *s, struct mp_log *log)
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{
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s->log = log;
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s->tty_fd = -1;
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vt_switcher_pipe[0] = -1;
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vt_switcher_pipe[1] = -1;
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if (mp_make_cloexec_pipe(vt_switcher_pipe)) {
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MP_ERR(s, "Creating pipe failed: %s", mp_strerror(errno));
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return -1;
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}
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s->tty_fd = open("/dev/tty", O_RDWR | O_CLOEXEC);
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if (s->tty_fd < 0) {
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MP_ERR(s, "Can't open TTY for VT control: %s", mp_strerror(errno));
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return -1;
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}
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struct sigaction act;
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act.sa_handler = vt_switcher_sighandler;
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act.sa_flags = SA_RESTART;
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sigemptyset(&act.sa_mask);
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sigaction(SIGUSR1, &act, 0);
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sigaction(SIGUSR2, &act, 0);
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struct vt_mode vt_mode;
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if (ioctl(s->tty_fd, VT_GETMODE, &vt_mode) < 0) {
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MP_ERR(s, "VT_GETMODE failed: %s", mp_strerror(errno));
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return -1;
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}
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vt_mode.mode = VT_PROCESS;
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vt_mode.relsig = SIGUSR1;
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vt_mode.acqsig = SIGUSR2;
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if (ioctl(s->tty_fd, VT_SETMODE, &vt_mode) < 0) {
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MP_ERR(s, "VT_SETMODE failed: %s", mp_strerror(errno));
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return -1;
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}
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return 0;
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}
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void vt_switcher_acquire(struct vt_switcher *s,
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void (*handler)(void*), void *user_data)
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{
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s->handlers[HANDLER_ACQUIRE] = handler;
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s->handler_data[HANDLER_ACQUIRE] = user_data;
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}
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void vt_switcher_release(struct vt_switcher *s,
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void (*handler)(void*), void *user_data)
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{
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s->handlers[HANDLER_RELEASE] = handler;
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s->handler_data[HANDLER_RELEASE] = user_data;
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}
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void vt_switcher_interrupt_poll(struct vt_switcher *s)
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{
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unsigned char event = EVT_INTERRUPT;
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write(vt_switcher_pipe[1], &event, sizeof(event));
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}
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void vt_switcher_destroy(struct vt_switcher *s)
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{
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close(s->tty_fd);
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close(vt_switcher_pipe[0]);
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close(vt_switcher_pipe[1]);
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}
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void vt_switcher_poll(struct vt_switcher *s, int timeout_ms)
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{
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struct pollfd fds[1] = {
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{ .events = POLLIN, .fd = vt_switcher_pipe[0] },
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};
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poll(fds, 1, timeout_ms);
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if (!fds[0].revents)
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return;
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unsigned char event;
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if (read(fds[0].fd, &event, sizeof(event)) != sizeof(event))
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return;
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switch (event) {
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case EVT_RELEASE:
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s->handlers[HANDLER_RELEASE](s->handler_data[HANDLER_RELEASE]);
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if (ioctl(s->tty_fd, VT_RELDISP, 1) < 0) {
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MP_ERR(s, "Failed to release virtual terminal\n");
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}
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break;
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case EVT_ACQUIRE:
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s->handlers[HANDLER_ACQUIRE](s->handler_data[HANDLER_ACQUIRE]);
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if (ioctl(s->tty_fd, VT_RELDISP, VT_ACKACQ) < 0) {
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MP_ERR(s, "Failed to acquire virtual terminal\n");
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}
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break;
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case EVT_INTERRUPT:
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break;
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}
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}
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