libio/oldtmpfile.c

   1 /* Copyright (C) 1991-2020 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <shlib-compat.h>
  19 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  20
  21 #define _IO_USE_OLD_IO_FILE
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <iolibio.h>
  25
  26 /* This returns a new stream opened on a temporary file (generated
  27    by tmpnam).  The file is opened with mode "w+b" (binary read/write).
  28    If we couldn't generate a unique filename or the file couldn't
  29    be opened, NULL is returned.  */
  30 FILE *
  31 attribute_compat_text_section
  32 __old_tmpfile (void)
  33 {
  34   char buf[FILENAME_MAX];
  35   int fd;
  36   FILE *f;
  37
  38   if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
  39     return NULL;
  40   fd = __gen_tempname (buf, 0, 0, __GT_FILE);
  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) __unlink (buf);
  47
  48   if ((f = _IO_old_fdopen (fd, "w+b")) == NULL)
  49     __close (fd);
  50
  51   return f;
  52 }
  53
  54 compat_symbol (libc, __old_tmpfile, tmpfile, GLIBC_2_0);
  55 #endif