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 |
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 (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 | |
52 | static int |
53 | do_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 | if (fstat64 (fd: fd, buf: &st1) != 0) |
102 | { |
103 | puts (s: "fstat64 failed" ); |
104 | return 1; |
105 | } |
106 | |
107 | close (fd: fd); |
108 | |
109 | if (linkat (fromfd: dir_fd, from: "some-file" , tofd: dir_fd, to: "another-file" , flags: 0) != 0) |
110 | { |
111 | puts (s: "symlinkat failed" ); |
112 | return 1; |
113 | } |
114 | |
115 | struct stat64 st2; |
116 | if (fstatat64 (fd: dir_fd, file: "some-file" , buf: &st2, flag: 0) != 0) |
117 | { |
118 | puts (s: "fstatat64 failed" ); |
119 | return 1; |
120 | } |
121 | if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) |
122 | { |
123 | puts (s: "file changed after symlinkat" ); |
124 | return 1; |
125 | } |
126 | |
127 | if (fstatat64 (fd: dir_fd, file: "another-file" , buf: &st2, AT_SYMLINK_NOFOLLOW) != 0) |
128 | { |
129 | puts (s: "2nd fstatat64 failed" ); |
130 | return 1; |
131 | } |
132 | if (S_ISLNK (st2.st_mode)) |
133 | { |
134 | puts (s: "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 (s: "stat results for linked file do not match" ); |
142 | return 1; |
143 | } |
144 | |
145 | if (fstatat64 (fd: dir_fd, file: "another-file" , buf: &st2, flag: 0) != 0) |
146 | { |
147 | puts (s: "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 (s: "stat results do not match" ); |
155 | return 1; |
156 | } |
157 | |
158 | if (unlinkat (fd: dir_fd, name: "another-file" , flag: 0) != 0) |
159 | { |
160 | puts (s: "unlinkat failed" ); |
161 | return 1; |
162 | } |
163 | if (unlinkat (fd: dir_fd, name: "some-file" , flag: 0) != 0) |
164 | { |
165 | puts (s: "2nd unlinkat failed" ); |
166 | return 1; |
167 | } |
168 | |
169 | close (fd: dir_fd); |
170 | |
171 | return 0; |
172 | } |
173 | |