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6c80c6e8 FW |
1 | /* Test for <file_change_detection.c>. |
2 | Copyright (C) 2020 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* The header uses the internal __fileno symbol, which is not | |
20 | available outside of libc (even to internal tests). */ | |
21 | #define __fileno(fp) fileno (fp) | |
22 | ||
23 | #include <file_change_detection.h> | |
24 | ||
25 | #include <array_length.h> | |
26 | #include <stdlib.h> | |
27 | #include <support/check.h> | |
28 | #include <support/support.h> | |
29 | #include <support/temp_file.h> | |
30 | #include <support/test-driver.h> | |
31 | #include <support/xstdio.h> | |
32 | #include <support/xunistd.h> | |
33 | #include <unistd.h> | |
34 | ||
35 | static void | |
36 | all_same (struct file_change_detection *array, size_t length) | |
37 | { | |
38 | for (size_t i = 0; i < length; ++i) | |
39 | for (size_t j = 0; j < length; ++j) | |
40 | { | |
41 | if (test_verbose > 0) | |
42 | printf ("info: comparing %zu and %zu\n", i, j); | |
43 | TEST_VERIFY (file_is_unchanged (array + i, array + j)); | |
44 | } | |
45 | } | |
46 | ||
47 | static void | |
48 | all_different (struct file_change_detection *array, size_t length) | |
49 | { | |
50 | for (size_t i = 0; i < length; ++i) | |
51 | for (size_t j = 0; j < length; ++j) | |
52 | { | |
53 | if (i == j) | |
54 | continue; | |
55 | if (test_verbose > 0) | |
56 | printf ("info: comparing %zu and %zu\n", i, j); | |
57 | TEST_VERIFY (!file_is_unchanged (array + i, array + j)); | |
58 | } | |
59 | } | |
60 | ||
61 | static int | |
62 | do_test (void) | |
63 | { | |
64 | /* Use a temporary directory with various paths. */ | |
65 | char *tempdir = support_create_temp_directory ("tst-file_change_detection-"); | |
66 | ||
67 | char *path_dangling = xasprintf ("%s/dangling", tempdir); | |
68 | char *path_does_not_exist = xasprintf ("%s/does-not-exist", tempdir); | |
69 | char *path_empty1 = xasprintf ("%s/empty1", tempdir); | |
70 | char *path_empty2 = xasprintf ("%s/empty2", tempdir); | |
71 | char *path_fifo = xasprintf ("%s/fifo", tempdir); | |
72 | char *path_file1 = xasprintf ("%s/file1", tempdir); | |
73 | char *path_file2 = xasprintf ("%s/file2", tempdir); | |
74 | char *path_loop = xasprintf ("%s/loop", tempdir); | |
75 | char *path_to_empty1 = xasprintf ("%s/to-empty1", tempdir); | |
76 | char *path_to_file1 = xasprintf ("%s/to-file1", tempdir); | |
77 | ||
78 | add_temp_file (path_dangling); | |
79 | add_temp_file (path_empty1); | |
80 | add_temp_file (path_empty2); | |
81 | add_temp_file (path_fifo); | |
82 | add_temp_file (path_file1); | |
83 | add_temp_file (path_file2); | |
84 | add_temp_file (path_loop); | |
85 | add_temp_file (path_to_empty1); | |
86 | add_temp_file (path_to_file1); | |
87 | ||
88 | xsymlink ("target-does-not-exist", path_dangling); | |
89 | support_write_file_string (path_empty1, ""); | |
90 | support_write_file_string (path_empty2, ""); | |
91 | TEST_COMPARE (mknod (path_fifo, 0777 | S_IFIFO, 0), 0); | |
92 | support_write_file_string (path_file1, "line\n"); | |
93 | support_write_file_string (path_file2, "line\n"); | |
94 | xsymlink ("loop", path_loop); | |
95 | xsymlink ("empty1", path_to_empty1); | |
96 | xsymlink ("file1", path_to_file1); | |
97 | ||
98 | FILE *fp_file1 = xfopen (path_file1, "r"); | |
99 | FILE *fp_file2 = xfopen (path_file2, "r"); | |
100 | FILE *fp_empty1 = xfopen (path_empty1, "r"); | |
101 | FILE *fp_empty2 = xfopen (path_empty2, "r"); | |
102 | ||
103 | /* Test for the same (empty) files. */ | |
104 | { | |
105 | struct file_change_detection fcd[10]; | |
106 | int i = 0; | |
107 | /* Two empty files always have the same contents. */ | |
108 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_empty1)); | |
109 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_empty2)); | |
110 | /* So does a missing file (which is treated as empty). */ | |
111 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], | |
112 | path_does_not_exist)); | |
113 | /* And a symbolic link loop. */ | |
114 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_loop)); | |
115 | /* And a dangling symbolic link. */ | |
116 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_dangling)); | |
117 | /* And a directory. */ | |
118 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], tempdir)); | |
119 | /* And a symbolic link to an empty file. */ | |
120 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_to_empty1)); | |
121 | /* Likewise for access the file via a FILE *. */ | |
122 | TEST_VERIFY (file_change_detection_for_fp (&fcd[i++], fp_empty1)); | |
123 | TEST_VERIFY (file_change_detection_for_fp (&fcd[i++], fp_empty2)); | |
124 | /* And a NULL FILE * (missing file). */ | |
125 | TEST_VERIFY (file_change_detection_for_fp (&fcd[i++], NULL)); | |
126 | TEST_COMPARE (i, array_length (fcd)); | |
127 | ||
128 | all_same (fcd, array_length (fcd)); | |
129 | } | |
130 | ||
131 | /* Symbolic links are resolved. */ | |
132 | { | |
133 | struct file_change_detection fcd[3]; | |
134 | int i = 0; | |
135 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_file1)); | |
136 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_to_file1)); | |
137 | TEST_VERIFY (file_change_detection_for_fp (&fcd[i++], fp_file1)); | |
138 | TEST_COMPARE (i, array_length (fcd)); | |
139 | all_same (fcd, array_length (fcd)); | |
140 | } | |
141 | ||
142 | /* Test for different files. */ | |
143 | { | |
144 | struct file_change_detection fcd[5]; | |
145 | int i = 0; | |
146 | /* The other files are not empty. */ | |
147 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_empty1)); | |
148 | /* These two files have the same contents, but have different file | |
149 | identity. */ | |
150 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_file1)); | |
151 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_file2)); | |
152 | /* FIFOs are always different, even with themselves. */ | |
153 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_fifo)); | |
154 | TEST_VERIFY (file_change_detection_for_path (&fcd[i++], path_fifo)); | |
155 | TEST_COMPARE (i, array_length (fcd)); | |
156 | all_different (fcd, array_length (fcd)); | |
157 | ||
158 | /* Replacing the file with its symbolic link does not make a | |
159 | difference. */ | |
160 | TEST_VERIFY (file_change_detection_for_path (&fcd[1], path_to_file1)); | |
161 | all_different (fcd, array_length (fcd)); | |
162 | } | |
163 | ||
164 | /* Wait for a file change. Depending on file system time stamp | |
165 | resolution, this subtest blocks for a while. */ | |
166 | for (int use_stdio = 0; use_stdio < 2; ++use_stdio) | |
167 | { | |
168 | struct file_change_detection initial; | |
169 | TEST_VERIFY (file_change_detection_for_path (&initial, path_file1)); | |
170 | while (true) | |
171 | { | |
172 | support_write_file_string (path_file1, "line\n"); | |
173 | struct file_change_detection current; | |
174 | if (use_stdio) | |
175 | TEST_VERIFY (file_change_detection_for_fp (¤t, fp_file1)); | |
176 | else | |
177 | TEST_VERIFY (file_change_detection_for_path (¤t, path_file1)); | |
178 | if (!file_is_unchanged (&initial, ¤t)) | |
179 | break; | |
180 | /* Wait for a bit to reduce system load. */ | |
181 | usleep (100 * 1000); | |
182 | } | |
183 | } | |
184 | ||
185 | fclose (fp_empty1); | |
186 | fclose (fp_empty2); | |
187 | fclose (fp_file1); | |
188 | fclose (fp_file2); | |
189 | ||
190 | free (path_dangling); | |
191 | free (path_does_not_exist); | |
192 | free (path_empty1); | |
193 | free (path_empty2); | |
194 | free (path_fifo); | |
195 | free (path_file1); | |
196 | free (path_file2); | |
197 | free (path_loop); | |
198 | free (path_to_empty1); | |
199 | free (path_to_file1); | |
200 | ||
201 | free (tempdir); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | #include <support/test-driver.c> |