io/openat64.c

   1 /* Copyright (C) 2005-2016 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <stdarg.h>
  21 #include <stddef.h>
  22 #include <stdio.h>
  23 #include <sys/stat.h>
  24 #include <libc-internal.h>
  25
  26 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  27    the directory associated with FD.  If O_CREAT or O_TMPFILE is in OFLAG, a
  28    third argument is the file protection.  */
  29 int
  30 __openat64 (int fd, const char *file, int oflag, ...)
  31 {
  32   int mode;
  33
  34   if (file == NULL)
  35     {
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39
  40   if (fd != AT_FDCWD && file[0] != '/')
  41     {
  42       /* Check FD is associated with a directory.  */
  43       struct stat64 st;
  44       if (__fxstat64 (_STAT_VER, fd, &st) != 0)
  45         return -1;
  46
  47       if (!S_ISDIR (st.st_mode))
  48         {
  49           __set_errno (ENOTDIR);
  50           return -1;
  51         }
  52     }
  53
  54   if (__OPEN_NEEDS_MODE (oflag))
  55     {
  56       va_list arg;
  57       va_start (arg, oflag);
  58       mode = va_arg (arg, int);
  59       va_end (arg);
  60
  61       ignore_value (mode);
  62     }
  63
  64   __set_errno (ENOSYS);
  65   return -1;
  66 }
  67 libc_hidden_def (__openat64)
  68 weak_alias (__openat64, openat64)
  69 stub_warning (openat64)
  70
  71 /* __openat64_2 is a generic wrapper that calls __openat64.
  72    So give a stub warning for that symbol too.  */
  73 stub_warning (__openat_2)