Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
 
/*
 * media_device_test.c - Media Controller Device ioctl loop Test
 *
 * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
 *
 */
 
/*
 * This file adds a test for Media Controller API.
 * This test should be run as root and should not be
 * included in the Kselftest run. This test should be
 * run when hardware and driver that makes use Media
 * Controller API are present in the system.
 *
 * This test opens user specified Media Device and calls
 * MEDIA_IOC_DEVICE_INFO ioctl in a loop once every 10
 * seconds.
 *
 * Usage:
 *	sudo ./media_device_test -d /dev/mediaX
 *
 *	While test is running, remove the device and
 *	ensure there are no use after free errors and
 *	other Oops in the dmesg. Enable KaSan kernel
 *	config option for use-after-free error detection.
*/
 
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <time.h>
#include <linux/media.h>
 
#include "../kselftest.h"
 
int main(int argc, char **argv)
{
<------>int opt;
<------>char media_device[256];
<------>int count;
<------>struct media_device_info mdi;
<------>int ret;
<------>int fd;
 
<------>if (argc < 2) {
<------><------>printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
<------><------>exit(-1);
<------>}
 
<------>/* Process arguments */
<------>while ((opt = getopt(argc, argv, "d:")) != -1) {
<------><------>switch (opt) {
<------><------>case 'd':
<------><------><------>strncpy(media_device, optarg, sizeof(media_device) - 1);
<------><------><------>media_device[sizeof(media_device)-1] = '\0';
<------><------><------>break;
<------><------>default:
<------><------><------>printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
<------><------><------>exit(-1);
<------><------>}
<------>}
 
<------>if (getuid() != 0)
<------><------>ksft_exit_skip("Please run the test as root - Exiting.\n");
 
<------>/* Generate random number of interations */
<------>srand((unsigned int) time(NULL));
<------>count = rand();
 
<------>/* Open Media device and keep it open */
<------>fd = open(media_device, O_RDWR);
<------>if (fd == -1) {
<------><------>printf("Media Device open errno %s\n", strerror(errno));
<------><------>exit(-1);
<------>}
 
<------>printf("\nNote:\n"
<------>       "While test is running, remove the device and\n"
<------>       "ensure there are no use after free errors and\n"
<------>       "other Oops in the dmesg. Enable KaSan kernel\n"
<------>       "config option for use-after-free error detection.\n\n");
 
<------>printf("Running test for %d iterations\n", count);
 
<------>while (count > 0) {
<------><------>ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
<------><------>if (ret < 0)
<------><------><------>printf("Media Device Info errno %s\n", strerror(errno));
<------><------>else
<------><------><------>printf("Media device model %s driver %s - count %d\n",
<------><------><------><------>mdi.model, mdi.driver, count);
<------><------>sleep(10);
<------><------>count--;
<------>}
}