blob: 5d49943e77d0bbf11fde0af8d6dd7226b12514c3 [file] [log] [blame]
* media_device_test.c - Media Controller Device ioctl loop Test
* Copyright (c) 2016 Shuah Khan <>
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* This file is released under the GPLv2.
* 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>
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]);
/* 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';
printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
if (getuid() != 0) {
printf("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));
"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 iternations\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));
printf("Media device model %s driver %s - count %d\n",
mdi.model, mdi.driver, count);