sysdeps/mach/hurd/openat.c

   1 /* openat -- Open a file named relative to an open directory.  Hurd version.
   2    Copyright (C) 2006-2024 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)