tools/testing/selftests/media_tests/media_device_open.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/media_tests/media_device_open.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/media_tests/media_device_open.c
Extension
.c
Size
1919 bytes
Lines
83
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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");

	/* 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);
	}

	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\n",
			mdi.model, mdi.driver);
}

Annotation

Implementation Notes