/* Verify that fopen works with copy relocation on _IO_stderr_ in binaries
   linked with glibc 2.0.
   Copyright (C) 2024-2026 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 <shlib-compat.h>

#if TEST_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
# define _LIBC
# define _IO_USE_OLD_IO_FILE
# include <stdio.h>
# include <string.h>
# include <unistd.h>
# include <limits.h>
# include <sys/stat.h>
# include <support/check.h>

struct _IO_jump_t;

struct _IO_FILE_plus
{
  FILE file;
  const struct _IO_jump_t *vtable;
};

extern struct _IO_FILE_plus _IO_stderr_;
compat_symbol_reference (libc, _IO_stderr_, _IO_stderr_, GLIBC_2_0);
compat_symbol_reference (libc, fopen, fopen, GLIBC_2_0);
compat_symbol_reference (libc, fclose, fclose, GLIBC_2_0);

static int
do_test (int argc, char *argv[])
{
  static char filename[PATH_MAX + 1];
  struct stat st;
  char *name = NULL;
  int i;

  /* Try to trigger copy relocation.  */
  TEST_VERIFY_EXIT (_IO_stderr_.file._fileno == STDERR_FILENO);

  for (i = 1; i < argc; i++)
    {
      name = argv[i];
      if (stat (name, &st) == 0)
	{
	  TEST_VERIFY_EXIT (strlen (name) <= PATH_MAX);
	  break;
	}
    }
  TEST_VERIFY_EXIT (name != NULL);

  strcpy (filename, name);
  FILE *fp = fopen (filename, "r");
  TEST_VERIFY_EXIT (strcmp (filename, name) == 0);
  TEST_VERIFY_EXIT (fp != NULL);
  TEST_VERIFY_EXIT (fclose (fp) == 0);
  return 0;
}
#else
# include <support/test-driver.h>

static int
do_test (int argc, char *argv[])
{
  return EXIT_UNSUPPORTED;
}
#endif

#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>
