1#include <dirent.h>
2#include <fcntl.h>
3#include <stdio.h>
4#include <stdlib.h>
5#include <string.h>
6#include <unistd.h>
7#include <sys/stat.h>
8
9
10static void prepare (void);
11#define PREPARE(argc, argv) prepare ()
12
13static int do_test (void);
14#define TEST_FUNCTION do_test ()
15
16#include "../test-skeleton.c"
17
18static int dir_fd;
19
20static void
21prepare (void)
22{
23 size_t test_dir_len = strlen (test_dir);
24 static const char dir_name[] = "/tst-fstatat.XXXXXX";
25
26 size_t dirbuflen = test_dir_len + sizeof (dir_name);
27 char *dirbuf = malloc (size: dirbuflen);
28 if (dirbuf == NULL)
29 {
30 puts (s: "out of memory");
31 exit (1);
32 }
33
34 snprintf (s: dirbuf, maxlen: dirbuflen, format: "%s%s", test_dir, dir_name);
35 if (mkdtemp (template: dirbuf) == NULL)
36 {
37 puts (s: "cannot create temporary directory");
38 exit (1);
39 }
40
41 add_temp_file (name: dirbuf);
42
43 dir_fd = open (file: dirbuf, O_RDONLY | O_DIRECTORY);
44 if (dir_fd == -1)
45 {
46 puts (s: "cannot open directory");
47 exit (1);
48 }
49}
50
51
52static int
53do_test (void)
54{
55 /* fdopendir takes over the descriptor, make a copy. */
56 int dupfd = dup (fd: dir_fd);
57 if (dupfd == -1)
58 {
59 puts (s: "dup failed");
60 return 1;
61 }
62 if (lseek (fd: dupfd, offset: 0, SEEK_SET) != 0)
63 {
64 puts (s: "1st lseek failed");
65 return 1;
66 }
67
68 /* The directory should be empty safe the . and .. files. */
69 DIR *dir = fdopendir (fd: dupfd);
70 if (dir == NULL)
71 {
72 puts (s: "fdopendir failed");
73 return 1;
74 }
75 struct dirent64 *d;
76 while ((d = readdir64 (dirp: dir)) != NULL)
77 if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
78 {
79 printf (format: "temp directory contains file \"%s\"\n", d->d_name);
80 return 1;
81 }
82 closedir (dirp: dir);
83
84 /* Try to create a file. */
85 int fd = openat (fd: dir_fd, file: "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
86 if (fd == -1)
87 {
88 if (errno == ENOSYS)
89 {
90 puts (s: "*at functions not supported");
91 return 0;
92 }
93
94 puts (s: "file creation failed");
95 return 1;
96 }
97 write (fd, "hello", 5);
98 puts (s: "file created");
99
100 struct stat64 st1;
101
102 /* Before closing the file, try using this file descriptor to open
103 another file. This must fail. */
104 if (fstatat64 (fd: fd, file: "some-file", buf: &st1, flag: 0) != -1)
105 {
106 puts (s: "fstatatat using descriptor for normal file worked");
107 return 1;
108 }
109 if (errno != ENOTDIR)
110 {
111 puts (s: "error for fstatat using descriptor for normal file not ENOTDIR ");
112 return 1;
113 }
114
115 if (fstat64 (fd: fd, buf: &st1) != 0)
116 {
117 puts (s: "fstat64 failed");
118 return 1;
119 }
120
121 close (fd: fd);
122
123 struct stat64 st2;
124 if (fstatat64 (fd: dir_fd, file: "some-file", buf: &st2, flag: 0) != 0)
125 {
126 puts (s: "fstatat64 failed");
127 return 1;
128 }
129
130 if (st1.st_dev != st2.st_dev
131 || st1.st_ino != st2.st_ino
132 || st1.st_size != st2.st_size)
133 {
134 puts (s: "stat results do not match");
135 return 1;
136 }
137
138 if (unlinkat (fd: dir_fd, name: "some-file", flag: 0) != 0)
139 {
140 puts (s: "unlinkat failed");
141 return 1;
142 }
143
144 if (fstatat64 (fd: dir_fd, file: "some-file", buf: &st2, flag: 0) == 0)
145 {
146 puts (s: "second fstatat64 succeeded");
147 return 1;
148 }
149 if (errno != ENOENT)
150 {
151 puts (s: "second fstatat64 did not fail with ENOENT");
152 return 1;
153 }
154
155 /* Create a file descriptor which is closed again right away. */
156 int dir_fd2 = dup (fd: dir_fd);
157 if (dir_fd2 == -1)
158 {
159 puts (s: "dup failed");
160 return 1;
161 }
162 close (fd: dir_fd2);
163
164 if (fstatat64 (fd: dir_fd2, file: "some-file", buf: &st1, flag: 0) != -1)
165 {
166 puts (s: "fstatat64 using closed descriptor worked");
167 return 1;
168 }
169 if (errno != EBADF)
170 {
171 puts (s: "error for fstatat using closed descriptor not EBADF ");
172 return 1;
173 }
174
175 close (fd: dir_fd);
176
177 if (fstatat64 (fd: -1, file: "some-file", buf: &st1, flag: 0) != -1)
178 {
179 puts (s: "fstatat64 using invalid descriptor worked");
180 return 1;
181 }
182 if (errno != EBADF)
183 {
184 puts (s: "error for fstatat using invalid descriptor not EBADF ");
185 return 1;
186 }
187
188 return 0;
189}
190

source code of glibc/io/tst-fstatat.c