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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
ac933e8e RC |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <fcntl.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include "alloc-util.h" | |
26 | #include "fd-util.h" | |
27 | #include "io-util.h" | |
28 | #include "macro.h" | |
29 | ||
30 | static void test_sparse_write_one(int fd, const char *buffer, size_t n) { | |
31 | char check[n]; | |
32 | ||
33 | assert_se(lseek(fd, 0, SEEK_SET) == 0); | |
34 | assert_se(ftruncate(fd, 0) >= 0); | |
35 | assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n); | |
36 | ||
37 | assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n); | |
38 | assert_se(ftruncate(fd, n) >= 0); | |
39 | ||
40 | assert_se(lseek(fd, 0, SEEK_SET) == 0); | |
41 | assert_se(read(fd, check, n) == (ssize_t) n); | |
42 | ||
43 | assert_se(memcmp(buffer, check, n) == 0); | |
44 | } | |
45 | ||
46 | static void test_sparse_write(void) { | |
47 | const char test_a[] = "test"; | |
48 | const char test_b[] = "\0\0\0\0test\0\0\0\0"; | |
49 | const char test_c[] = "\0\0test\0\0\0\0"; | |
50 | const char test_d[] = "\0\0test\0\0\0test\0\0\0\0test\0\0\0\0\0test\0\0\0test\0\0\0\0test\0\0\0\0\0\0\0\0"; | |
51 | const char test_e[] = "test\0\0\0\0test"; | |
52 | _cleanup_close_ int fd = -1; | |
53 | char fn[] = "/tmp/sparseXXXXXX"; | |
54 | ||
55 | fd = mkostemp(fn, O_CLOEXEC); | |
56 | assert_se(fd >= 0); | |
57 | unlink(fn); | |
58 | ||
59 | test_sparse_write_one(fd, test_a, sizeof(test_a)); | |
60 | test_sparse_write_one(fd, test_b, sizeof(test_b)); | |
61 | test_sparse_write_one(fd, test_c, sizeof(test_c)); | |
62 | test_sparse_write_one(fd, test_d, sizeof(test_d)); | |
63 | test_sparse_write_one(fd, test_e, sizeof(test_e)); | |
64 | } | |
65 | ||
66 | int main(void) { | |
67 | test_sparse_write(); | |
68 | ||
69 | return 0; | |
70 | } |