1/* Test that _IO_wfile_sync does not crash (bug 20568).
2 Copyright (C) 2019-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <fcntl.h>
20#include <locale.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <wchar.h>
25#include <support/check.h>
26#include <support/xstdio.h>
27#include <support/xunistd.h>
28#include <support/temp_file.h>
29
30static const char test_data[] = "This is a test of _IO_wfile_sync.";
31
32static int
33do_test (void)
34{
35 static char *infile;
36 int infd;
37 FILE *infp;
38
39 infd = create_temp_file (base: "tst-wfile-sync-in-", filename: &infile);
40 xwrite (infd, test_data, strlen (test_data));
41 xclose (infd);
42
43 infd = xopen (path: infile, O_RDONLY, 0);
44 infp = fdopen (infd, "r");
45
46 TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
47 /* Fill the stdio buffer and advance the read pointer. */
48 TEST_VERIFY_EXIT (fgetwc (infp) != WEOF);
49 /* This calls _IO_wfile_sync, it should not crash. */
50 TEST_VERIFY_EXIT (setvbuf (infp, NULL, _IONBF, 0) == 0);
51 /* Verify that the external file offset has been synchronized. */
52 TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
53
54 fclose (infp);
55 free (ptr: infile);
56
57 return 0;
58}
59
60#include <support/test-driver.c>
61

source code of glibc/libio/tst-wfile-sync.c