70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "macro.h"
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static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
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char check[n];
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assert_se(lseek(fd, 0, SEEK_SET) == 0);
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assert_se(ftruncate(fd, 0) >= 0);
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assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
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assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
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assert_se(ftruncate(fd, n) >= 0);
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assert_se(lseek(fd, 0, SEEK_SET) == 0);
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assert_se(read(fd, check, n) == (ssize_t) n);
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assert_se(memcmp(buffer, check, n) == 0);
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}
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static void test_sparse_write(void) {
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const char test_a[] = "test";
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const char test_b[] = "\0\0\0\0test\0\0\0\0";
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const char test_c[] = "\0\0test\0\0\0\0";
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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";
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const char test_e[] = "test\0\0\0\0test";
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_cleanup_close_ int fd = -1;
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char fn[] = "/tmp/sparseXXXXXX";
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fd = mkostemp(fn, O_CLOEXEC);
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assert_se(fd >= 0);
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unlink(fn);
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test_sparse_write_one(fd, test_a, sizeof(test_a));
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test_sparse_write_one(fd, test_b, sizeof(test_b));
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test_sparse_write_one(fd, test_c, sizeof(test_c));
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test_sparse_write_one(fd, test_d, sizeof(test_d));
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test_sparse_write_one(fd, test_e, sizeof(test_e));
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}
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int main(void) {
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test_sparse_write();
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return 0;
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}
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