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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#ifndef FBIO_WAITFORVSYNC
#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
#endif
int main(int argc, char** argv) {
int fd = open("/dev/graphics/fb0", O_RDWR);
if (fd >= 0) {
do {
uint32_t crt = 0;
int err = ioctl(fd, FBIO_WAITFORVSYNC, &crt);
if (err < 0) {
printf("FBIO_WAITFORVSYNC error: %s\n", strerror(errno));
break;
}
} while(1);
close(fd);
}
return 0;
}
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