2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include "alloc-util.h"
29 static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
32 assert_se(lseek(fd, 0, SEEK_SET) == 0);
33 assert_se(ftruncate(fd, 0) >= 0);
34 assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
36 assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
37 assert_se(ftruncate(fd, n) >= 0);
39 assert_se(lseek(fd, 0, SEEK_SET) == 0);
40 assert_se(read(fd, check, n) == (ssize_t) n);
42 assert_se(memcmp(buffer, check, n) == 0);
45 static void test_sparse_write(void) {
46 const char test_a[] = "test";
47 const char test_b[] = "\0\0\0\0test\0\0\0\0";
48 const char test_c[] = "\0\0test\0\0\0\0";
49 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";
50 const char test_e[] = "test\0\0\0\0test";
51 _cleanup_close_ int fd = -1;
52 char fn[] = "/tmp/sparseXXXXXX";
54 fd = mkostemp(fn, O_CLOEXEC);
58 test_sparse_write_one(fd, test_a, sizeof(test_a));
59 test_sparse_write_one(fd, test_b, sizeof(test_b));
60 test_sparse_write_one(fd, test_c, sizeof(test_c));
61 test_sparse_write_one(fd, test_d, sizeof(test_d));
62 test_sparse_write_one(fd, test_e, sizeof(test_e));