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/* Test freopen with mmap stdio.
Copyright (C) 2002-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <support/check.h>
#include <support/temp_file.h>
static int fd;
static char *name;
static void
do_prepare (int argc, char *argv[])
{
fd = create_temp_file ("tst-freopen.", &name);
TEST_VERIFY_EXIT (fd != -1);
}
#define PREPARE do_prepare
/* Basic tests for freopen. */
static void
do_test_basic (void)
{
const char * const test = "Let's test freopen.\n";
char temp[strlen (test) + 1];
FILE *f = fdopen (fd, "w");
if (f == NULL)
FAIL_EXIT1 ("fdopen: %m");
fputs (test, f);
fclose (f);
f = fopen (name, "r");
if (f == NULL)
FAIL_EXIT1 ("fopen: %m");
if (fread (temp, 1, strlen (test), f) != strlen (test))
FAIL_EXIT1 ("fread: %m");
temp [strlen (test)] = '\0';
if (strcmp (test, temp))
FAIL_EXIT1 ("read different string than was written: (%s, %s)",
test, temp);
f = freopen (name, "r+", f);
if (f == NULL)
FAIL_EXIT1 ("freopen: %m");
if (fseek (f, 0, SEEK_SET) != 0)
FAIL_EXIT1 ("fseek: %m");
if (fread (temp, 1, strlen (test), f) != strlen (test))
FAIL_EXIT1 ("fread: %m");
temp [strlen (test)] = '\0';
if (strcmp (test, temp))
FAIL_EXIT1 ("read different string than was written: (%s, %s)",
test, temp);
fclose (f);
}
/* Test for BZ#21398, where it tries to freopen stdio after the close
of its file descriptor. */
static void
do_test_bz21398 (void)
{
(void) close (STDIN_FILENO);
FILE *f = freopen (name, "r", stdin);
if (f == NULL)
FAIL_EXIT1 ("freopen: %m");
TEST_VERIFY_EXIT (ferror (f) == 0);
char buf[128];
char *ret = fgets (buf, sizeof (buf), stdin);
TEST_VERIFY_EXIT (ret != NULL);
TEST_VERIFY_EXIT (ferror (f) == 0);
}
static int
do_test (void)
{
do_test_basic ();
do_test_bz21398 ();
return 0;
}
#include <support/test-driver.c>
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