1/* Open a stdio stream on an anonymous temporary file.  Generic/POSIX version.
2   Copyright (C) 1991,93,1996-2000,2002,2003 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#include <stdio_private.h>
21#include <unistd.h>
22
23#ifdef USE_IN_LIBIO
24# include <iolibio.h>
25# define __fdopen INTUSE(_IO_fdopen)
26# ifndef tmpfile
27#  define tmpfile __new_tmpfile
28# endif
29#endif
30
31#ifndef GEN_THIS
32# define GEN_THIS __GT_FILE
33#endif
34
35/* This returns a new stream opened on a temporary file (generated
36   by tmpnam).  The file is opened with mode "w+b" (binary read/write).
37   If we couldn't generate a unique filename or the file couldn't
38   be opened, NULL is returned.  */
39FILE *
40tmpfile (void)
41{
42  char buf[FILENAME_MAX];
43  int fd;
44  FILE *f;
45
46  if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
47    return NULL;
48  fd = __gen_tempname (buf, GEN_THIS);
49  if (fd < 0)
50    return NULL;
51
52  /* Note that this relies on the Unix semantics that
53     a file is not really removed until it is closed.  */
54  (void) __unlink (buf);
55
56  if ((f = __fdopen (fd, "w+b")) == NULL)
57    __close (fd);
58
59  return f;
60}
61
62#if defined USE_IN_LIBIO && GEN_THIS == __GT_FILE /* Not for tmpfile64.  */
63# undef tmpfile
64# include <shlib-compat.h>
65versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1);
66#endif
67