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