1  /* openat -- Open a file named relative to an open directory.  Hurd version.
       2     Copyright (C) 2006-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <fcntl.h>
      21  #include <stdarg.h>
      22  #include <stddef.h>
      23  #include <stdio.h>
      24  #include <sys/stat.h>
      25  #include <hurd.h>
      26  #include <hurd/fd.h>
      27  #include <sysdep-cancel.h>
      28  
      29  /* Open FILE with access OFLAG.  Interpret relative paths relative to
      30     the directory associated with FD.  If O_CREAT or O_TMPFILE is in OFLAG, a
      31     third argument is the file protection.  */
      32  int
      33  __openat (int fd, const char *file, int oflag, ...)
      34  {
      35    mode_t mode;
      36    io_t port;
      37    int cancel_oldtype;
      38  
      39    if (__OPEN_NEEDS_MODE (oflag))
      40      {
      41        va_list arg;
      42        va_start (arg, oflag);
      43        mode = va_arg (arg, mode_t);
      44        va_end (arg);
      45      }
      46    else
      47      mode = 0;
      48  
      49    cancel_oldtype = LIBC_CANCEL_ASYNC();
      50    port = __file_name_lookup_at (fd, 0, file, oflag, mode);
      51    LIBC_CANCEL_RESET (cancel_oldtype);
      52  
      53    if (port == MACH_PORT_NULL)
      54      return -1;
      55  
      56    return _hurd_intern_fd (port, oflag, 1);
      57  }
      58  libc_hidden_def (__openat)
      59  weak_alias (__openat, openat)
      60  
      61  /* openat64 is just the same as openat for us.  */
      62  weak_alias (__openat, __openat64)
      63  libc_hidden_weak (__openat64)
      64  weak_alias (__openat, openat64)