src/test/test-io-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4 ***/
   5
   6 #include <fcntl.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 #include "alloc-util.h"
  11 #include "fd-util.h"
  12 #include "io-util.h"
  13 #include "macro.h"
  14
  15 static void test_sparse_write_one(int fd, const char *buffer, size_t n) {
  16         char check[n];
  17
  18         assert_se(lseek(fd, 0, SEEK_SET) == 0);
  19         assert_se(ftruncate(fd, 0) >= 0);
  20         assert_se(sparse_write(fd, buffer, n, 4) == (ssize_t) n);
  21
  22         assert_se(lseek(fd, 0, SEEK_CUR) == (off_t) n);
  23         assert_se(ftruncate(fd, n) >= 0);
  24
  25         assert_se(lseek(fd, 0, SEEK_SET) == 0);
  26         assert_se(read(fd, check, n) == (ssize_t) n);
  27
  28         assert_se(memcmp(buffer, check, n) == 0);
  29 }
  30
  31 static void test_sparse_write(void) {
  32         const char test_a[] = "test";
  33         const char test_b[] = "\0\0\0\0test\0\0\0\0";
  34         const char test_c[] = "\0\0test\0\0\0\0";
  35         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";
  36         const char test_e[] = "test\0\0\0\0test";
  37         _cleanup_close_ int fd = -1;
  38         char fn[] = "/tmp/sparseXXXXXX";
  39
  40         fd = mkostemp(fn, O_CLOEXEC);
  41         assert_se(fd >= 0);
  42         unlink(fn);
  43
  44         test_sparse_write_one(fd, test_a, sizeof(test_a));
  45         test_sparse_write_one(fd, test_b, sizeof(test_b));
  46         test_sparse_write_one(fd, test_c, sizeof(test_c));
  47         test_sparse_write_one(fd, test_d, sizeof(test_d));
  48         test_sparse_write_one(fd, test_e, sizeof(test_e));
  49 }
  50
  51 int main(void) {
  52         test_sparse_write();
  53
  54         return 0;
  55 }