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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) International Business Machines Corp., 2006
* Copyright (c) Cyril Hrubis 2014 <chrubis@suse.cz>
* Copyright (c) Linux Test Project, 2003-2023
* Author: Yi Yang <yyangcdl@cn.ibm.com>
*/
/*\
* [Description]
*
* Check the basic functionality of the readlinkat() system call.
*
* - readlinkat() passes if dirfd is directory file descriptor
* and the pathname is relative.
* - readlinkat() passes if the pathname is abspath, then dirfd
* is ignored.
* - readlinkat() passes if dirfd is the special value AT_FDCWD
* and the pathname is relative.
* - readlinkat() passes if pathname is an empty string, in which
* case the call operates on the symbolic link referred to by dirfd.
*/
#include <stdlib.h>
#include <stdio.h>
#include "tst_test.h"
#include "lapi/fcntl.h"
#define TEST_FILE "readlink_file"
#define TEST_SYMLINK "readlink_symlink"
static int file_fd, dir_fd, dir_fd2;
static int fd_atcwd = AT_FDCWD;
static const char *abspath;
static const char *testsymlink;
static const char *emptypath;
static struct tcase {
int *fd;
const char **path;
} tcases[] = {
{&dir_fd, &testsymlink},
{&dir_fd, &abspath},
{&file_fd, &abspath},
{&fd_atcwd, &abspath},
{&fd_atcwd, &testsymlink},
{&dir_fd2, &emptypath},
};
static void verify_readlinkat(unsigned int i)
{
char buf[1024];
struct tcase *tc = &tcases[i];
memset(buf, 0, sizeof(buf));
TST_EXP_POSITIVE(readlinkat(*tc->fd, *tc->path, buf, sizeof(buf)),
"readlinkat(%d, %s, %s, %ld)",
*tc->fd, *tc->path, buf, sizeof(buf));
if (strcmp(buf, TEST_FILE) == 0)
tst_res(TPASS, "The filename in buffer is correct");
else
tst_res(TFAIL, "Wrong filename in buffer '%s'", buf);
}
static void setup(void)
{
char *tmpdir = tst_get_tmpdir();
abspath = tst_aprintf("%s/" TEST_SYMLINK, tmpdir);
free(tmpdir);
file_fd = SAFE_OPEN(TEST_FILE, O_CREAT, 0600);
SAFE_SYMLINK(TEST_FILE, TEST_SYMLINK);
dir_fd = SAFE_OPEN(".", O_DIRECTORY);
dir_fd2 = SAFE_OPEN(TEST_SYMLINK, O_PATH | O_NOFOLLOW);
}
static void cleanup(void)
{
if (file_fd > -1)
SAFE_CLOSE(file_fd);
if (dir_fd > -1)
SAFE_CLOSE(dir_fd);
if (dir_fd2 > -1)
SAFE_CLOSE(dir_fd2);
}
static struct tst_test test = {
.test = verify_readlinkat,
.needs_tmpdir = 1,
.setup = setup,
.cleanup = cleanup,
.bufs = (struct tst_buffers []) {
{&testsymlink, .str = TEST_SYMLINK},
{&emptypath, .str = ""},
{},
},
.tcnt = ARRAY_SIZE(tcases),
};
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