stdio-common/tmpfile64.c

   1 /* Copyright (C) 1991, 1993, 1996, 1997, 1998 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 <stdio.h>
  20 #include <unistd.h>
  21
  22 #ifdef USE_IN_LIBIO
  23 # include <iolibio.h>
  24 # define __fdopen _IO_fdopen
  25 #endif
  26
  27 /* This returns a new stream opened on a temporary file (generated
  28    by tmpnam) The file is opened with mode "w+b" (binary read/write).
  29    If we couldn't generate a unique filename or the file couldn't
  30    be opened, NULL is returned.  */
  31 FILE *
  32 tmpfile64 ()
  33 {
  34   char buf[FILENAME_MAX];
  35   int fd;
  36   FILE *f;
  37
  38   if (__path_search (buf, FILENAME_MAX, NULL, "tmpf"))
  39     return NULL;
  40   fd = __gen_tempname (buf, 1, 1);
  41   if (fd < 0)
  42     return NULL;
  43
  44   /* Note that this relies on the Unix semantics that
  45      a file is not really removed until it is closed.  */
  46   (void) remove (buf);
  47
  48   if ((f = __fdopen (fd, "w+b")) == NULL)
  49     __close (fd);
  50
  51   return f;
  52 }