sysdeps/mach/hurd/openat.c

   1 /* openat -- Open a file named relative to an open directory.  Hurd version.
   2    Copyright (C) 2006 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    <http://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
  28 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  29    the directory associated with FD.  If OFLAG includes O_CREAT, a
  30    third argument is the file protection.  */
  31 int
  32 __openat (fd, file, oflag)
  33      int fd;
  34      const char *file;
  35      int oflag;
  36 {
  37   int mode;
  38   io_t port;
  39
  40   if (oflag & O_CREAT)
  41     {
  42       va_list arg;
  43       va_start (arg, oflag);
  44       mode = va_arg (arg, int);
  45       va_end (arg);
  46     }
  47   else
  48     mode = 0;
  49
  50   port = __file_name_lookup_at (fd, 0, file, oflag, mode);
  51   if (port == MACH_PORT_NULL)
  52     return -1;
  53
  54   return _hurd_intern_fd (port, oflag, 1);
  55 }
  56 libc_hidden_def (__openat)
  57 weak_alias (__openat, openat)
  58
  59 int
  60 __openat_2 (fd, file, oflag)
  61      int fd;
  62      const char *file;
  63      int oflag;
  64 {
  65   if (oflag & O_CREAT)
  66     __fortify_fail ("invalid openat call: O_CREAT without mode");
  67
  68   return __openat (fd, file, oflag);
  69 }
  70
  71 /* openat64 is just the same as openat for us.  */
  72 weak_alias (__openat, __openat64)
  73 libc_hidden_weak (__openat64)
  74 weak_alias (__openat, openat64)
  75 strong_alias (__openat_2, __openat64_2)