stdio-common/tmpfile64.c

   1 /* Copyright (C) 1991, 1993, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21
  22
  23 /* This returns a new stream opened on a temporary file (generated
  24    by tmpnam) The file is opened with mode "w+b" (binary read/write).
  25    If we couldn't generate a unique filename or the file couldn't
  26    be opened, NULL is returned.  */
  27 FILE *
  28 tmpfile64 ()
  29 {
  30 #ifdef _G_OPEN64
  31   char buf[FILENAME_MAX];
  32   char *filename;
  33   FILE *f;
  34
  35   filename = __stdio_gen_tempname (buf, sizeof (buf), (char *) NULL, "tmpf", 0,
  36                                    (size_t *) NULL, &f, 1);
  37   if (filename == NULL)
  38     return NULL;
  39
  40   /* Note that this relies on the Unix semantics that
  41      a file is not really removed until it is closed.  */
  42   (void) remove (filename);
  43
  44   return f;
  45 #else
  46   __set_errno (ENOSYS);
  47   return NULL;
  48 #endif
  49 }