/* Open a stdio stream on an anonymous temporary file.  Generic/POSIX version.

   Copyright (C) 1991-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <fcntl.h>

#include <stdio.h>

#include <unistd.h>

#include <iolibio.h>

#define __fdopen _IO_fdopen

#ifndef tmpfile

# define tmpfile __new_tmpfile

#endif

/* This returns a new stream opened on a temporary file (generated

   by tmpnam).  The file is opened with mode "w+b" (binary read/write).

   If we couldn't generate a unique filename or the file couldn't

   be opened, NULL is returned.  */

FILE *

tmpfile (void)

{

  int fd;

  FILE *f;

  int flags = 0;

#ifdef FLAGS

  flags = FLAGS;

#endif

  /* First try a system specific method.  */

  fd = __gen_tempfd (flags);

  if (fd < 0)

    {

      char buf[FILENAME_MAX];

      if (__path_search (buf, sizeof buf, NULL, "tmpf", 0))

	return NULL;

      fd = __gen_tempname (buf, 0, flags, __GT_FILE);

      if (fd < 0)

	return NULL;

      /* Note that this relies on the Unix semantics that

	 a file is not really removed until it is closed.  */

      (void) __unlink (buf);

    }

  if ((f = __fdopen (fd, "w+b")) == NULL)

    __close (fd);

  return f;

}

#if !defined O_LARGEFILE || O_LARGEFILE == 0

weak_alias (__new_tmpfile, tmpfile64)

#endif

#ifndef FLAGS /* Not for tmpfile64.  */

# undef tmpfile

# include <shlib-compat.h>

versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1);

#endif