1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*
7 * DESCRIPTION
8 * Testcase to check the basic functionality of the getcwd(2)
9 * system call on a symbolic link.
10 *
11 * ALGORITHM
12 * 1) create a directory, and create a symbolic link to it at the
13 * same directory level.
14 * 2) get the working directory of a directory, and its pathname.
15 * 3) get the working directory of a symbolic link, and its pathname,
16 * and its readlink info.
17 * 4) compare the working directories and link information.
18 */
19
20 #define _GNU_SOURCE 1
21 #include <errno.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <stdlib.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <stdlib.h>
28 #include "tst_test.h"
29
30 static char dir[BUFSIZ], dir_link[BUFSIZ];
31
verify_getcwd(void)32 static void verify_getcwd(void)
33 {
34 char link[BUFSIZ];
35 char *res1 = NULL;
36 char *res2 = NULL;
37
38 SAFE_CHDIR(dir);
39
40 res1 = getcwd(NULL, 0);
41 if (!res1) {
42 tst_res(TFAIL | TERRNO, "getcwd() failed to "
43 "get working directory of a directory");
44 goto end;
45 }
46
47 SAFE_CHDIR("..");
48 SAFE_CHDIR(dir_link);
49
50 res2 = getcwd(NULL, 0);
51 if (!res2) {
52 tst_res(TFAIL | TERRNO, "getcwd() failed to get "
53 "working directory of a symbolic link");
54 goto end;
55 }
56
57 if (strcmp(res1, res2)) {
58 tst_res(TFAIL,
59 "getcwd() got mismatched working directories (%s, %s)",
60 res1, res2);
61 goto end;
62 }
63
64 SAFE_CHDIR("..");
65 SAFE_READLINK(dir_link, link, sizeof(link));
66
67 if (strcmp(link, SAFE_BASENAME(res1))) {
68 tst_res(TFAIL,
69 "link information didn't match the working directory");
70 goto end;
71 }
72
73 tst_res(TPASS, "getcwd() succeeded on a symbolic link");
74
75 end:
76 free(res1);
77 free(res2);
78 }
79
setup(void)80 static void setup(void)
81 {
82 sprintf(dir, "getcwd1.%d", getpid());
83 sprintf(dir_link, "getcwd2.%d", getpid());
84 SAFE_MKDIR(dir, 0755);
85 SAFE_SYMLINK(dir, dir_link);
86 }
87
88 static struct tst_test test = {
89 .needs_tmpdir = 1,
90 .setup = setup,
91 .test_all = verify_getcwd
92 };
93