1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014 Fujitsu Ltd.
4 * Copyright (c) Linux Test Project, 2003-2023
5 * Author: Zeng Linggang <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * - readlinkat() fails with EINVAL if the bufsiz is 0.
12 *
13 * - readlinkat() fails with EINVAL if the named file is not a symbolic link.
14 *
15 * - readlinkat() fails with ENOTDIR if the component of the path prefix is
16 * not a directory.
17 *
18 * - readlinkat() fails with ENOTDIR if the pathname is relative and
19 * dirfd is a file descriptor referring to a file other than a directory.
20 *
21 * - readlinkat() fails with EBADF if the file descriptor is invalid.
22 *
23 * - readlinkat() fails with ENOENT when the pathname does not exists.
24 */
25
26 #include "tst_test.h"
27
28 #define TEST_FILE "test_file"
29 #define SYMLINK_FILE "symlink_file"
30 #define BUFF_SIZE 256
31
32 static int file_fd, dir_fd;
33 static int fd_invalid = -1;
34
35 static struct tcase {
36 int *fd;
37 const char *pathname;
38 size_t bufsiz;
39 int exp_errno;
40 } tcases[] = {
41 {&dir_fd, SYMLINK_FILE, 0, EINVAL},
42 {&dir_fd, TEST_FILE, BUFF_SIZE, EINVAL},
43 {&file_fd, SYMLINK_FILE, BUFF_SIZE, ENOTDIR},
44 {&dir_fd, "test_file/test_file", BUFF_SIZE, ENOTDIR},
45 {&fd_invalid, SYMLINK_FILE, BUFF_SIZE, EBADF},
46 {&dir_fd, "does_not_exists", BUFF_SIZE, ENOENT},
47 };
48
verify_readlinkat(unsigned int i)49 static void verify_readlinkat(unsigned int i)
50 {
51 char buf[BUFF_SIZE];
52 struct tcase *tc = &tcases[i];
53
54 memset(buf, 0, sizeof(buf));
55
56 TST_EXP_FAIL(readlinkat(*tc->fd, tc->pathname, buf, tc->bufsiz),
57 tc->exp_errno, "readlinkat(%d, %s, NULL, %ld)",
58 *tc->fd, tc->pathname, tc->bufsiz);
59 }
60
setup(void)61 static void setup(void)
62 {
63 dir_fd = SAFE_OPEN(".", O_RDONLY);
64
65 file_fd = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT, 0644);
66
67 SAFE_SYMLINK(TEST_FILE, SYMLINK_FILE);
68 }
69
cleanup(void)70 static void cleanup(void)
71 {
72 if (file_fd > -1)
73 SAFE_CLOSE(file_fd);
74
75 if (dir_fd > -1)
76 SAFE_CLOSE(dir_fd);
77 }
78
79 static struct tst_test test = {
80 .test = verify_readlinkat,
81 .needs_tmpdir = 1,
82 .setup = setup,
83 .cleanup = cleanup,
84 .tcnt = ARRAY_SIZE(tcases),
85 };
86