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