testcases/kernel/syscalls/getcwd/getcwd01.c

/*
 * Copyright (c) International Business Machines  Corp., 2001
 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.
 */

/*
 * DESCRIPTION
 * Testcase to test that getcwd(2) sets errno correctly.
 * 1) getcwd(2) fails if buf points to a bad address.
 * 2) getcwd(2) fails if the size is invalid.
 * 3) getcwd(2) fails if the size is set to 0.
 * 4) getcwd(2) fails if the size is set to 1.
 * 5) getcwd(2) fails if buf points to NULL and the size is set to 1.
 *
 * Expected Result:
 * 1) getcwd(2) should return NULL and set errno to EFAULT.
 * 2) getcwd(2) should return NULL and set errno to ENOMEM.
 * 3) getcwd(2) should return NULL and set errno to EINVAL.
 * 4) getcwd(2) should return NULL and set errno to ERANGE.
 * 5) getcwd(2) should return NULL and set errno to ERANGE.
 *
 */

#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include "tst_test.h"

static char buffer[5];

static struct t_case {
	char *buf;
	size_t size;
	int exp_err;
} tcases[] = {
	{(void *)-1, PATH_MAX, EFAULT},
	{NULL, (size_t)-1, ENOMEM},
	{buffer, 0, EINVAL},
	{buffer, 1, ERANGE},
	{NULL, 1, ERANGE}
};

static void verify_getcwd(unsigned int n)
{
	struct t_case *tc = &tcases[n];
	char *res;

	errno = 0;
	res = getcwd(tc->buf, tc->size);
	TEST_ERRNO = errno;
	if (res) {
		tst_res(TFAIL, "getcwd() succeeded unexpectedly");
		return;
	}

	if (TEST_ERRNO != tc->exp_err) {
		tst_res(TFAIL | TTERRNO, "getcwd() failed unexpectedly, expected %s",
			tst_strerrno(tc->exp_err));
		return;
	}

	tst_res(TPASS | TTERRNO, "getcwd() failed as expected");
}

static void setup(void)
{
	SAFE_CHDIR("/tmp");
}

static struct tst_test test = {
	.tid = "getcwd01",
	.setup = setup,
	.tcnt = ARRAY_SIZE(tcases),
	.test = verify_getcwd
};