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
10 static void prepare (void);
11 #define PREPARE(argc, argv) prepare ()
12
13 static int do_test (void);
14 #define TEST_FUNCTION do_test ()
15
16 #include "../test-skeleton.c"
17
18 static int dir_fd;
19
20 static void
prepare(void)21 prepare (void)
22 {
23 size_t test_dir_len = strlen (test_dir);
24 static const char dir_name[] = "/tst-linkat.XXXXXX";
25
26 size_t dirbuflen = test_dir_len + sizeof (dir_name);
27 char *dirbuf = malloc (dirbuflen);
28 if (dirbuf == NULL)
29 {
30 puts ("out of memory");
31 exit (1);
32 }
33
34 snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
35 if (mkdtemp (dirbuf) == NULL)
36 {
37 puts ("cannot create temporary directory");
38 exit (1);
39 }
40
41 add_temp_file (dirbuf);
42
43 dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
44 if (dir_fd == -1)
45 {
46 puts ("cannot open directory");
47 exit (1);
48 }
49 }
50
51
52 static int
do_test(void)53 do_test (void)
54 {
55 /* fdopendir takes over the descriptor, make a copy. */
56 int dupfd = dup (dir_fd);
57 if (dupfd == -1)
58 {
59 puts ("dup failed");
60 return 1;
61 }
62 if (lseek (dupfd, 0, SEEK_SET) != 0)
63 {
64 puts ("1st lseek failed");
65 return 1;
66 }
67
68 /* The directory should be empty safe the . and .. files. */
69 DIR *dir = fdopendir (dupfd);
70 if (dir == NULL)
71 {
72 puts ("fdopendir failed");
73 return 1;
74 }
75 struct dirent64 *d;
76 while ((d = readdir64 (dir)) != NULL)
77 if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
78 {
79 printf ("temp directory contains file \"%s\"\n", d->d_name);
80 return 1;
81 }
82 closedir (dir);
83
84 /* Try to create a file. */
85 int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
86 if (fd == -1)
87 {
88 if (errno == ENOSYS)
89 {
90 puts ("*at functions not supported");
91 return 0;
92 }
93
94 puts ("file creation failed");
95 return 1;
96 }
97 write (fd, "hello", 5);
98 puts ("file created");
99
100 struct stat64 st1;
101 if (fstat64 (fd, &st1) != 0)
102 {
103 puts ("fstat64 failed");
104 return 1;
105 }
106
107 close (fd);
108
109 if (linkat (dir_fd, "some-file", dir_fd, "another-file", 0) != 0)
110 {
111 puts ("symlinkat failed");
112 return 1;
113 }
114
115 struct stat64 st2;
116 if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
117 {
118 puts ("fstatat64 failed");
119 return 1;
120 }
121 if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
122 {
123 puts ("file changed after symlinkat");
124 return 1;
125 }
126
127 if (fstatat64 (dir_fd, "another-file", &st2, AT_SYMLINK_NOFOLLOW) != 0)
128 {
129 puts ("2nd fstatat64 failed");
130 return 1;
131 }
132 if (S_ISLNK (st2.st_mode))
133 {
134 puts ("2nd fstatat64 shows file is a symlink");
135 return 1;
136 }
137 if (st1.st_dev != st2.st_dev
138 || st1.st_ino != st2.st_ino
139 || st1.st_size != st2.st_size)
140 {
141 puts ("stat results for linked file do not match");
142 return 1;
143 }
144
145 if (fstatat64 (dir_fd, "another-file", &st2, 0) != 0)
146 {
147 puts ("3rd fstatat64 failed");
148 return 1;
149 }
150 if (st1.st_dev != st2.st_dev
151 || st1.st_ino != st2.st_ino
152 || st1.st_size != st2.st_size)
153 {
154 puts ("stat results do not match");
155 return 1;
156 }
157
158 if (unlinkat (dir_fd, "another-file", 0) != 0)
159 {
160 puts ("unlinkat failed");
161 return 1;
162 }
163 if (unlinkat (dir_fd, "some-file", 0) != 0)
164 {
165 puts ("2nd unlinkat failed");
166 return 1;
167 }
168
169 close (dir_fd);
170
171 return 0;
172 }
173