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-symlinkat.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 | static const char symlinkcontent[] = "some-file" ; |
85 | if (symlinkat (from: symlinkcontent, tofd: dir_fd, to: "another-file" ) != 0) |
86 | { |
87 | puts (s: "symlinkat failed" ); |
88 | return 1; |
89 | } |
90 | |
91 | struct stat64 st2; |
92 | if (fstatat64 (fd: dir_fd, file: "another-file" , buf: &st2, AT_SYMLINK_NOFOLLOW) != 0) |
93 | { |
94 | puts (s: "fstatat64 failed" ); |
95 | return 1; |
96 | } |
97 | if (!S_ISLNK (st2.st_mode)) |
98 | { |
99 | puts (s: "2nd fstatat64 does not show file is a symlink" ); |
100 | return 1; |
101 | } |
102 | |
103 | if (fstatat64 (fd: dir_fd, file: symlinkcontent, buf: &st2, AT_SYMLINK_NOFOLLOW) == 0) |
104 | { |
105 | puts (s: "2nd fstatat64 succeeded" ); |
106 | return 1; |
107 | } |
108 | |
109 | char buf[100]; |
110 | int n = readlinkat (dir_fd, "another-file" , buf, sizeof (buf)); |
111 | if (n == -1) |
112 | { |
113 | puts (s: "readlinkat failed" ); |
114 | return 1; |
115 | } |
116 | if (n != sizeof (symlinkcontent) - 1) |
117 | { |
118 | printf (format: "readlinkat returned %d, expected %zu\n" , |
119 | n, sizeof (symlinkcontent) - 1); |
120 | return 1; |
121 | } |
122 | if (strncmp (buf, symlinkcontent, n) != 0) |
123 | { |
124 | puts (s: "readlinkat retrieved wrong link content" ); |
125 | return 1; |
126 | } |
127 | |
128 | if (unlinkat (fd: dir_fd, name: "another-file" , flag: 0) != 0) |
129 | { |
130 | puts (s: "unlinkat failed" ); |
131 | return 1; |
132 | } |
133 | |
134 | close (fd: dir_fd); |
135 | |
136 | return 0; |
137 | } |
138 | |