1#include <dirent.h>
2#include <fcntl.h>
3#include <stdbool.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <string.h>
7#include <unistd.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-openat.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
99 /* Before closing the file, try using this file descriptor to open
100 another file. This must fail. */
101 int fd2 = openat (fd: fd, file: "should-not-work", O_CREAT|O_RDWR, 0666);
102 if (fd2 != -1)
103 {
104 puts (s: "openat using descriptor for normal file worked");
105 return 1;
106 }
107 if (errno != ENOTDIR)
108 {
109 puts (s: "error for openat using descriptor for normal file not ENOTDIR ");
110 return 1;
111 }
112
113 close (fd: fd);
114 puts (s: "file created");
115
116 /* fdopendir takes over the descriptor, make a copy. */
117 dupfd = dup (fd: dir_fd);
118 if (dupfd == -1)
119 {
120 puts (s: "dup failed");
121 return 1;
122 }
123 if (lseek (fd: dupfd, offset: 0, SEEK_SET) != 0)
124 {
125 puts (s: "2nd lseek failed");
126 return 1;
127 }
128
129 /* The directory should be empty safe the . and .. files. */
130 dir = fdopendir (fd: dupfd);
131 if (dir == NULL)
132 {
133 puts (s: "fdopendir failed");
134 return 1;
135 }
136 bool seen_file = false;
137 while ((d = readdir64 (dirp: dir)) != NULL)
138 if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
139 {
140 if (strcmp (d->d_name, "some-file") != 0)
141 {
142 printf (format: "temp directory contains file \"%s\"\n", d->d_name);
143 return 1;
144 }
145
146 seen_file = true;
147 }
148 closedir (dirp: dir);
149
150 if (!seen_file)
151 {
152 puts (s: "file not created in correct directory");
153 return 1;
154 }
155
156 int cwdfd = open (file: ".", O_RDONLY | O_DIRECTORY);
157 if (cwdfd == -1)
158 {
159 puts (s: "cannot get descriptor for cwd");
160 return 1;
161 }
162
163 if (fchdir (fd: dir_fd) != 0)
164 {
165 puts (s: "1st fchdir failed");
166 return 1;
167 }
168
169 if (unlink (name: "some-file") != 0)
170 {
171 puts (s: "unlink failed");
172 return 1;
173 }
174
175 if (fchdir (fd: cwdfd) != 0)
176 {
177 puts (s: "2nd fchdir failed");
178 return 1;
179 }
180
181 close (fd: dir_fd);
182 close (fd: cwdfd);
183
184 /* With the file descriptor closed the next call must fail. */
185 fd = openat (fd: dir_fd, file: "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
186 if (fd != -1)
187 {
188 puts (s: "openat using closed descriptor succeeded");
189 return 1;
190 }
191 if (errno != EBADF)
192 {
193 puts (s: "openat using closed descriptor did not set EBADF");
194 return 1;
195 }
196
197 fd = openat (fd: -1, file: "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
198 if (fd != -1)
199 {
200 puts (s: "openat using -1 descriptor succeeded");
201 return 1;
202 }
203 if (errno != EBADF)
204 {
205 puts (s: "openat using -1 descriptor did not set EBADF");
206 return 1;
207 }
208
209 return 0;
210}
211

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