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/* Check if internal buffer reallocation work for large paths (BZ #28126)
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <ftw.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
#include <stdio.h>
static int
my_func (const char *file, const struct stat *sb, int flag)
{
return 0;
}
static const char folder[NAME_MAX] = { [0 ... 253] = 'a', [254] = '\0' };
#define NSUBFOLDERS 16
static int nsubfolders;
static void
do_cleanup (void)
{
xchdir ("..");
for (int i = 0; i < nsubfolders; i++)
{
remove (folder);
xchdir ("..");
}
remove (folder);
}
#define CLEANUP_HANDLER do_cleanup
static void
check_mkdir (const char *path)
{
int r = mkdir (path, 0777);
/* Some filesystem such as overlayfs does not support larger path required
to trigger the internal buffer reallocation. */
if (r != 0)
{
if (errno == ENAMETOOLONG)
FAIL_UNSUPPORTED ("the filesystem does not support the required"
"large path");
else
FAIL_EXIT1 ("mkdir (\"%s\", 0%o): %m", folder, 0777);
}
}
static int
do_test (void)
{
char *tempdir = support_create_temp_directory ("tst-bz28126");
/* Create path with various subfolders to force an internal buffer
reallocation within ntfw. */
char *path = xasprintf ("%s/%s", tempdir, folder);
check_mkdir (path);
xchdir (path);
free (path);
for (int i = 0; i < NSUBFOLDERS - 1; i++)
{
check_mkdir (folder);
xchdir (folder);
nsubfolders++;
}
TEST_COMPARE (ftw (tempdir, my_func, 20), 0);
free (tempdir);
do_cleanup ();
return 0;
}
#include <support/test-driver.c>
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