1  /* Copyright (C) 2005-2023 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 <errno.h>
      19  #include <fcntl.h>
      20  #include <stdarg.h>
      21  #include <stddef.h>
      22  #include <stdio.h>
      23  #include <sys/stat.h>
      24  
      25  /* Open FILE with access OFLAG.  Interpret relative paths relative to
      26     the directory associated with FD.  If O_CREAT or O_TMPFILE is in OFLAG, a
      27     third argument is the file protection.  */
      28  int
      29  __openat64 (int fd, const char *file, int oflag, ...)
      30  {
      31    int mode;
      32  
      33    if (file == NULL)
      34      {
      35        __set_errno (EINVAL);
      36        return -1;
      37      }
      38  
      39    if (fd != AT_FDCWD && file[0] != '/')
      40      {
      41        /* Check FD is associated with a directory.  */
      42        struct stat64 st;
      43        if (__fstat64 (fd, &st) != 0)
      44  	return -1;
      45  
      46        if (!S_ISDIR (st.st_mode))
      47  	{
      48  	  __set_errno (ENOTDIR);
      49  	  return -1;
      50  	}
      51      }
      52  
      53    if (__OPEN_NEEDS_MODE (oflag))
      54      {
      55        va_list arg;
      56        va_start (arg, oflag);
      57        mode = va_arg (arg, int);
      58        va_end (arg);
      59  
      60        ignore_value (mode);
      61      }
      62  
      63    __set_errno (ENOSYS);
      64    return -1;
      65  }
      66  libc_hidden_def (__openat64)
      67  weak_alias (__openat64, openat64)
      68  stub_warning (openat64)
      69  
      70  /* __openat64_2 is a generic wrapper that calls __openat64.
      71     So give a stub warning for that symbol too.  */
      72  stub_warning (__openat_2)