xref: /aosp_15_r20/external/ltp/testcases/kernel/syscalls/ioctl/ioctl05.c (revision 49cdfc7efb34551c7342be41a7384b9c40d7cab7)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2017 Cyril Hrubis <[email protected]>
 */

/*\
 * [Description]
 *
 * Basic test for the BLKGETSIZE and BLKGETSIZE64 ioctls.
 *
 * - BLKGETSIZE returns size in 512 byte blocks BLKGETSIZE64 in bytes
 *   compare that they return the same value.
 * - lseek to the end of the device, this should work
 * - try to read from the device, read should return 0
 */

#include <stdint.h>
#include <errno.h>
#include <sys/mount.h>
#include "tst_test.h"

static int fd;

static void verify_ioctl(void)
{
	unsigned long size = 0;
	uint64_t size64 = 0;
	char buf;
	int ret;

	fd = SAFE_OPEN(tst_device->dev, O_RDONLY);

	SAFE_IOCTL(fd, BLKGETSIZE, &size);
	SAFE_IOCTL(fd, BLKGETSIZE64, &size64);

	if (size == size64/512) {
		tst_res(TPASS, "BLKGETSIZE returned %lu, BLKGETSIZE64 %llu",
			size, (unsigned long long)size64);
	} else {
		tst_res(TFAIL,
			"BLKGETSIZE returned %lu, BLKGETSIZE64 returned %llu",
			size, (unsigned long long)size64);
	}

	if (lseek(fd, size * 512, SEEK_SET) !=  (off_t)size * 512) {
		tst_res(TFAIL | TERRNO,
			"Cannot lseek to the end of the device");
	} else {
		tst_res(TPASS, "Could lseek to the end of the device");
	}

	ret = read(fd, &buf, 1);

	if (ret == 0) {
		tst_res(TPASS,
			"Got EOF when trying to read after the end of device");
	} else {
		tst_res(TFAIL | TERRNO,
			"Read at the end of device returned %i", ret);
	}

	SAFE_CLOSE(fd);
}

static void cleanup(void)
{
	if (fd > 0)
		SAFE_CLOSE(fd);
}

static struct tst_test test = {
	.needs_device = 1,
	.needs_root = 1,
	.cleanup = cleanup,
	.test_all = verify_ioctl,
};