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) system call.
9 * 1) getcwd(2) works fine if buf and size are valid.
10 * 2) getcwd(2) works fine if buf points to NULL and size is set to 0.
11 * 3) getcwd(2) works fine if buf points to NULL and size is greater than strlen(path).
12 */
13
14 #include <errno.h>
15 #include <unistd.h>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20
21 #include "tst_test.h"
22
23 static char exp_buf[PATH_MAX];
24 static char buffer[PATH_MAX];
25
26 static struct t_case {
27 char *buf;
28 size_t size;
29 } tcases[] = {
30 {buffer, sizeof(buffer)},
31 {NULL, 0},
32 {NULL, PATH_MAX}
33 };
34
dir_exists(const char * dirpath)35 static int dir_exists(const char *dirpath)
36 {
37 struct stat sb;
38
39 if (!stat(dirpath, &sb) && S_ISDIR(sb.st_mode))
40 return 1;
41
42 return 0;
43 }
44
get_tmpdir_path(void)45 static const char *get_tmpdir_path(void)
46 {
47 char *tmpdir = "/tmp";
48
49 if (dir_exists(tmpdir))
50 goto done;
51
52 /* fallback to $TMPDIR */
53 tmpdir = getenv("TMPDIR");
54 if (!tmpdir)
55 tst_brk(TBROK | TERRNO, "Failed to get $TMPDIR");
56
57 if (tmpdir[0] != '/')
58 tst_brk(TBROK, "$TMPDIR must be an absolute path");
59
60 if (!dir_exists(tmpdir))
61 tst_brk(TBROK | TERRNO, "TMPDIR '%s' doesn't exist", tmpdir);
62
63 done:
64 return tmpdir;
65 }
66
verify_getcwd(unsigned int n)67 static void verify_getcwd(unsigned int n)
68 {
69 struct t_case *tc = &tcases[n];
70 char *res = NULL;
71
72 errno = 0;
73 res = getcwd(tc->buf, tc->size);
74 TST_ERR = errno;
75 if (!res) {
76 tst_res(TFAIL | TTERRNO, "getcwd() failed");
77 goto end;
78 }
79
80 if (strcmp(exp_buf, res)) {
81 tst_res(TFAIL, "getcwd() returned unexpected directory: %s, "
82 "expected: %s", res, exp_buf);
83 goto end;
84 }
85
86 tst_res(TPASS, "getcwd() returned expected directory: %s", res);
87
88 end:
89 if (!tc->buf)
90 free(res);
91 }
92
setup(void)93 static void setup(void)
94 {
95 const char *tmpdir = get_tmpdir_path();
96
97 SAFE_CHDIR(tmpdir);
98
99 if (!realpath(tmpdir, exp_buf))
100 tst_brk(TBROK | TERRNO, "realpath() failed");
101
102 tst_res(TINFO, "Expected path '%s'", exp_buf);
103 }
104
105 static struct tst_test test = {
106 .setup = setup,
107 .tcnt = ARRAY_SIZE(tcases),
108 .test = verify_getcwd
109 };
110