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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 | |
ac933e8e RC |
6 | ***/ |
7 | ||
8 | #include <fcntl.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | ||
12 | #include "alloc-util.h" | |
13 | #include "fd-util.h" | |
14 | #include "io-util.h" | |
15 | #include "macro.h" | |
16 | ||
17 | static void test_sparse_write_one(int fd, const char *buffer, size_t n) { | |
18 | char check[n]; | |
19 | ||
20 | assert_se(lseek(fd, 0, SEEK_SET) == 0); | |
21 | assert_se(ftruncate(fd, 0) >= 0); | |
22 | assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n); | |
23 | ||
24 | assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n); | |
25 | assert_se(ftruncate(fd, n) >= 0); | |
26 | ||
27 | assert_se(lseek(fd, 0, SEEK_SET) == 0); | |
28 | assert_se(read(fd, check, n) == (ssize_t) n); | |
29 | ||
30 | assert_se(memcmp(buffer, check, n) == 0); | |
31 | } | |
32 | ||
33 | static void test_sparse_write(void) { | |
34 | const char test_a[] = "test"; | |
35 | const char test_b[] = "\0\0\0\0test\0\0\0\0"; | |
36 | const char test_c[] = "\0\0test\0\0\0\0"; | |
37 | 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"; | |
38 | const char test_e[] = "test\0\0\0\0test"; | |
39 | _cleanup_close_ int fd = -1; | |
40 | char fn[] = "/tmp/sparseXXXXXX"; | |
41 | ||
42 | fd = mkostemp(fn, O_CLOEXEC); | |
43 | assert_se(fd >= 0); | |
44 | unlink(fn); | |
45 | ||
46 | test_sparse_write_one(fd, test_a, sizeof(test_a)); | |
47 | test_sparse_write_one(fd, test_b, sizeof(test_b)); | |
48 | test_sparse_write_one(fd, test_c, sizeof(test_c)); | |
49 | test_sparse_write_one(fd, test_d, sizeof(test_d)); | |
50 | test_sparse_write_one(fd, test_e, sizeof(test_e)); | |
51 | } | |
52 | ||
53 | int main(void) { | |
54 | test_sparse_write(); | |
55 | ||
56 | return 0; | |
57 | } |