mirror of
https://github.com/mpv-player/mpv
synced 2024-12-23 07:12:39 +00:00
e4ec0f42e4
Do this to make the license situation less confusing. This change should be of no consequence, since LGPL is compatible with GPL anyway, and making it LGPL-only does not restrict the use with GPL code. Additionally, the wording implies that this is allowed, and that we can just remove the GPL part.
361 lines
9.8 KiB
C
361 lines
9.8 KiB
C
/*
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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 <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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#define RELEASE_SIGNAL SIGUSR1
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#define ACQUIRE_SIGNAL SIGUSR2
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static int vt_switcher_pipe[2];
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// KMS ------------------------------------------------------------------------
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static bool is_connector_valid(struct kms *kms, int connector_id,
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drmModeConnector *connector, bool silent)
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{
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if (!connector) {
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if (!silent) {
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MP_ERR(kms, "Cannot get connector %d: %s\n", connector_id,
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mp_strerror(errno));
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}
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return false;
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}
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if (connector->connection != DRM_MODE_CONNECTED) {
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if (!silent) {
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MP_ERR(kms, "Connector %d is disconnected\n", connector_id);
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}
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return false;
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}
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if (connector->count_modes == 0) {
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if (!silent) {
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MP_ERR(kms, "Connector %d has no valid modes\n", connector_id);
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}
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return false;
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}
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return true;
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}
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static bool setup_connector(
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struct kms *kms, const drmModeRes *res, int connector_id)
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{
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drmModeConnector *connector = NULL;
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if (connector_id == -1) {
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// get the first connected connector
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for (int i = 0; i < res->count_connectors; i++) {
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connector = drmModeGetConnector(kms->fd, res->connectors[i]);
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if (is_connector_valid(kms, i, connector, true)) {
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connector_id = i;
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break;
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}
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if (connector) {
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drmModeFreeConnector(connector);
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connector = NULL;
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}
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}
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if (connector_id == -1) {
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MP_ERR(kms, "No connected connectors found\n");
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return false;
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}
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}
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if (connector_id < 0 || connector_id >= res->count_connectors) {
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MP_ERR(kms, "Bad connector ID. Max valid connector ID = %u\n",
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res->count_connectors);
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return false;
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}
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connector = drmModeGetConnector(kms->fd, res->connectors[connector_id]);
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if (!is_connector_valid(kms, connector_id, connector, false))
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return false;
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kms->connector = connector;
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return true;
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}
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static bool setup_crtc(struct kms *kms, const drmModeRes *res)
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{
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for (unsigned int i = 0; i < kms->connector->count_encoders; ++i) {
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drmModeEncoder *encoder
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= drmModeGetEncoder(kms->fd, kms->connector->encoders[i]);
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if (!encoder) {
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MP_WARN(kms, "Cannot retrieve encoder %u:%u: %s\n",
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i, kms->connector->encoders[i], mp_strerror(errno));
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continue;
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}
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// iterate all global CRTCs
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for (unsigned int j = 0; j < res->count_crtcs; ++j) {
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// check whether this CRTC works with the encoder
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if (!(encoder->possible_crtcs & (1 << j)))
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continue;
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kms->encoder = encoder;
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kms->crtc_id = res->crtcs[j];
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return true;
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}
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drmModeFreeEncoder(encoder);
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}
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MP_ERR(kms,
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"Connector %u has no suitable CRTC\n",
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kms->connector->connector_id);
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return false;
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}
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static bool setup_mode(struct kms *kms, int mode_id)
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{
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if (mode_id < 0 || mode_id >= kms->connector->count_modes) {
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MP_ERR(
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kms,
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"Bad mode ID (max = %d).\n",
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kms->connector->count_modes - 1);
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MP_INFO(kms, "Available modes:\n");
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for (unsigned int i = 0; i < kms->connector->count_modes; i++) {
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MP_INFO(kms,
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"Mode %d: %s (%dx%d)\n",
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i,
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kms->connector->modes[i].name,
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kms->connector->modes[i].hdisplay,
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kms->connector->modes[i].vdisplay);
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}
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return false;
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}
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kms->mode = kms->connector->modes[mode_id];
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return true;
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}
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struct kms *kms_create(struct mp_log *log)
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{
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struct kms *ret = talloc(NULL, struct kms);
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*ret = (struct kms) {
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.log = mp_log_new(ret, log, "kms"),
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.fd = -1,
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.connector = NULL,
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.encoder = NULL,
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.mode = { 0 },
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.crtc_id = -1,
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};
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return ret;
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}
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bool kms_setup(struct kms *kms, const char *device_path, int connector_id, int mode_id)
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{
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kms->fd = open(device_path, O_RDWR | O_CLOEXEC);
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if (kms->fd < 0) {
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MP_ERR(kms, "Cannot open \"%s\": %s.\n", device_path, mp_strerror(errno));
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return false;
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}
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drmModeRes *res = drmModeGetResources(kms->fd);
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if (!res) {
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MP_ERR(kms, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
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return false;
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}
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if (!setup_connector(kms, res, connector_id))
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return false;
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if (!setup_crtc(kms, res))
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return false;
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if (!setup_mode(kms, mode_id))
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return false;
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return true;
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}
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void kms_destroy(struct kms *kms)
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{
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if (!kms)
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return;
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if (kms->connector) {
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drmModeFreeConnector(kms->connector);
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kms->connector = NULL;
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}
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if (kms->encoder) {
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drmModeFreeEncoder(kms->encoder);
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kms->encoder = NULL;
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}
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close(kms->fd);
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talloc_free(kms);
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}
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// VT switcher ----------------------------------------------------------------
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static void vt_switcher_sighandler(int sig)
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{
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unsigned char event = sig == RELEASE_SIGNAL ? EVT_RELEASE : EVT_ACQUIRE;
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write(vt_switcher_pipe[1], &event, sizeof(event));
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}
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static bool has_signal_installed(int signo)
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{
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struct sigaction act = { 0 };
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sigaction(signo, 0, &act);
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return act.sa_handler != 0;
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}
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static int install_signal(int signo, void (*handler)(int))
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{
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struct sigaction act = { 0 };
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act.sa_handler = handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_RESTART;
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return sigaction(signo, &act, NULL);
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}
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bool 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\n", mp_strerror(errno));
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return false;
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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\n", mp_strerror(errno));
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return false;
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}
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if (has_signal_installed(RELEASE_SIGNAL)) {
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MP_ERR(s, "Can't handle VT release - signal already used\n");
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return false;
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}
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if (has_signal_installed(ACQUIRE_SIGNAL)) {
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MP_ERR(s, "Can't handle VT acquire - signal already used\n");
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return false;
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}
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if (install_signal(RELEASE_SIGNAL, vt_switcher_sighandler)) {
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MP_ERR(s, "Failed to install release signal: %s\n", mp_strerror(errno));
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return false;
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}
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if (install_signal(ACQUIRE_SIGNAL, vt_switcher_sighandler)) {
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MP_ERR(s, "Failed to install acquire signal: %s\n", mp_strerror(errno));
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return false;
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}
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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\n", mp_strerror(errno));
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return false;
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}
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vt_mode.mode = VT_PROCESS;
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vt_mode.relsig = RELEASE_SIGNAL;
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vt_mode.acqsig = ACQUIRE_SIGNAL;
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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\n", mp_strerror(errno));
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return false;
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}
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return true;
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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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install_signal(RELEASE_SIGNAL, SIG_DFL);
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install_signal(ACQUIRE_SIGNAL, SIG_DFL);
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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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