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/* Test freopen and freopen64 with large offsets.
Copyright (C) 2024-2025 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 <mcheck.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/descriptors.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#define START_TEST(DESC) \
do \
{ \
fds = support_descriptors_list (); \
verbose_printf (DESC); \
} \
while (0)
#define END_TEST \
do \
{ \
support_descriptors_check (fds); \
support_descriptors_free (fds); \
} \
while (0)
int
do_test (void)
{
mtrace ();
struct support_descriptors *fds;
FILE *fp;
int ret;
char *temp_dir = support_create_temp_directory ("tst-freopen5");
/* This file is removed at the end of each test rather than left
around between tests to avoid problems with subsequent tests
reopening it as a large (2GB + 1 byte) file. */
char *file1 = xasprintf ("%s/file1", temp_dir);
/* fopen with freopen64: large offsets OK. */
START_TEST ("testing fopen with freopen64\n");
fp = fopen ("/dev/null", "r");
TEST_VERIFY_EXIT (fp != NULL);
fp = freopen64 (file1, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
setbuf (fp, NULL);
ret = fseeko64 (fp, 1LL << 32, SEEK_SET);
TEST_COMPARE (ret, 0);
ret = fputc ('x', fp);
TEST_COMPARE (ret, 'x');
xfclose (fp);
ret = remove (file1);
TEST_COMPARE (ret, 0);
END_TEST;
/* fopen64 with freopen64: large offsets OK. */
START_TEST ("testing fopen64 with freopen64\n");
fp = fopen64 ("/dev/null", "r");
TEST_VERIFY_EXIT (fp != NULL);
fp = freopen64 (file1, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
setbuf (fp, NULL);
ret = fseeko64 (fp, 1LL << 32, SEEK_SET);
TEST_COMPARE (ret, 0);
ret = fputc ('x', fp);
TEST_COMPARE (ret, 'x');
xfclose (fp);
ret = remove (file1);
TEST_COMPARE (ret, 0);
END_TEST;
/* fopen with freopen: large offsets not OK on 32-bit systems. */
START_TEST ("testing fopen with freopen\n");
fp = fopen ("/dev/null", "r");
TEST_VERIFY_EXIT (fp != NULL);
fp = freopen (file1, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
setbuf (fp, NULL);
ret = fseeko64 (fp, 1LL << 32, SEEK_SET);
TEST_COMPARE (ret, 0);
errno = 0;
ret = fputc ('x', fp);
if (sizeof (off_t) == 4)
{
TEST_COMPARE (ret, EOF);
TEST_COMPARE (errno, EFBIG);
}
else
TEST_COMPARE (ret, 'x');
fclose (fp);
ret = remove (file1);
TEST_COMPARE (ret, 0);
END_TEST;
/* fopen64 with freopen: large offsets not OK on 32-bit systems. */
START_TEST ("testing fopen64 with freopen\n");
fp = fopen64 ("/dev/null", "r");
TEST_VERIFY_EXIT (fp != NULL);
fp = freopen (file1, "w", fp);
TEST_VERIFY_EXIT (fp != NULL);
setbuf (fp, NULL);
ret = fseeko64 (fp, 1LL << 32, SEEK_SET);
TEST_COMPARE (ret, 0);
errno = 0;
ret = fputc ('x', fp);
if (sizeof (off_t) == 4)
{
TEST_COMPARE (ret, EOF);
TEST_COMPARE (errno, EFBIG);
}
else
TEST_COMPARE (ret, 'x');
fclose (fp);
ret = remove (file1);
TEST_COMPARE (ret, 0);
END_TEST;
free (temp_dir);
free (file1);
return 0;
}
#include <support/test-driver.c>
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