1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* Linux implementation for renameat2 function.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
#include <unistd.h>
/* Directory with the temporary files. */
static char *directory;
static int directory_fd;
/* Paths within that directory. */
static char *old_path; /* File is called "old". */
static char *new_path; /* File is called "new". */
/* Subdirectory within the directory above. */
static char *subdirectory;
int subdirectory_fd;
/* And a pathname in that directory (called "file"). */
static char *subdir_path;
static void
prepare (int argc, char **argv)
{
directory = support_create_temp_directory ("tst-renameat2-");
directory_fd = xopen (directory, O_RDONLY | O_DIRECTORY, 0);
old_path = xasprintf ("%s/old", directory);
add_temp_file (old_path);
new_path = xasprintf ("%s/new", directory);
add_temp_file (new_path);
subdirectory = xasprintf ("%s/subdir", directory);
xmkdir (subdirectory, 0777);
add_temp_file (subdirectory);
subdirectory_fd = xopen (subdirectory, O_RDONLY | O_DIRECTORY, 0);
subdir_path = xasprintf ("%s/file", subdirectory);
add_temp_file (subdir_path);
}
/* Delete all files, preparing a clean slate for the next test. */
static void
delete_all_files (void)
{
char *files[] = { old_path, new_path, subdir_path };
for (size_t i = 0; i < array_length (files); ++i)
if (unlink (files[i]) != 0 && errno != ENOENT)
FAIL_EXIT1 ("unlink (\"%s\"): %m", files[i]);
}
/* Return true if PATH exists in the file system. */
static bool
file_exists (const char *path)
{
return access (path, F_OK) == 0;
}
/* Check that PATH exists and has size EXPECTED_SIZE. */
static void
check_size (const char *path, off64_t expected_size)
{
struct stat64 st;
xstat (path, &st);
if (st.st_size != expected_size)
FAIL_EXIT1 ("file \"%s\": expected size %lld, actual size %lld",
path, (unsigned long long int) expected_size,
(unsigned long long int) st.st_size);
}
/* Rename tests where the target does not exist. */
static void
rename_without_existing_target (unsigned int flags)
{
delete_all_files ();
support_write_file_string (old_path, "");
TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, flags), 0);
TEST_VERIFY (!file_exists (old_path));
TEST_VERIFY (file_exists (new_path));
delete_all_files ();
support_write_file_string (old_path, "");
TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path, flags), 0);
TEST_VERIFY (!file_exists (old_path));
TEST_VERIFY (file_exists (new_path));
delete_all_files ();
support_write_file_string (old_path, "");
TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file", 0),
0);
TEST_VERIFY (!file_exists (old_path));
TEST_VERIFY (file_exists (subdir_path));
}
static int
do_test (void)
{
/* Tests with zero flags argument. These are expected to succeed
because this renameat2 variant can be implemented with
renameat. */
rename_without_existing_target (0);
/* renameat2 without flags replaces an existing destination. */
delete_all_files ();
support_write_file_string (old_path, "123");
support_write_file_string (new_path, "1234");
TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, 0), 0);
TEST_VERIFY (!file_exists (old_path));
check_size (new_path, 3);
/* Now we need to check for kernel support of renameat2 with
flags. */
delete_all_files ();
support_write_file_string (old_path, "");
if (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path, RENAME_NOREPLACE)
!= 0)
{
if (errno == EINVAL)
puts ("warning: no support for renameat2 with flags");
else
FAIL_EXIT1 ("renameat2 probe failed: %m");
}
else
{
/* We have full renameat2 support. */
rename_without_existing_target (RENAME_NOREPLACE);
/* Now test RENAME_NOREPLACE with an existing target. */
delete_all_files ();
support_write_file_string (old_path, "123");
support_write_file_string (new_path, "1234");
TEST_COMPARE (renameat2 (AT_FDCWD, old_path, AT_FDCWD, new_path,
RENAME_NOREPLACE), -1);
TEST_COMPARE (errno, EEXIST);
check_size (old_path, 3);
check_size (new_path, 4);
delete_all_files ();
support_write_file_string (old_path, "123");
support_write_file_string (new_path, "1234");
TEST_COMPARE (renameat2 (directory_fd, "old", AT_FDCWD, new_path,
RENAME_NOREPLACE), -1);
TEST_COMPARE (errno, EEXIST);
check_size (old_path, 3);
check_size (new_path, 4);
delete_all_files ();
support_write_file_string (old_path, "123");
support_write_file_string (subdir_path, "1234");
TEST_COMPARE (renameat2 (directory_fd, "old", subdirectory_fd, "file",
RENAME_NOREPLACE), -1);
TEST_COMPARE (errno, EEXIST);
check_size (old_path, 3);
check_size (subdir_path, 4);
/* The flag combination of RENAME_NOREPLACE and RENAME_EXCHANGE
is invalid. */
TEST_COMPARE (renameat2 (directory_fd, "ignored",
subdirectory_fd, "ignored",
RENAME_NOREPLACE | RENAME_EXCHANGE), -1);
TEST_COMPARE (errno, EINVAL);
}
/* Create all the pathnames to avoid warnings from the test
harness. */
support_write_file_string (old_path, "");
support_write_file_string (new_path, "");
support_write_file_string (subdir_path, "");
free (directory);
free (subdirectory);
free (old_path);
free (new_path);
free (subdir_path);
xclose (directory_fd);
xclose (subdirectory_fd);
return 0;
}
#define PREPARE prepare
#include <support/test-driver.c>
|
