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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <stdarg.h>
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <sys/stat.h>
  26 #include <hurd.h>
  27 #include <hurd/fd.h>
  28
  29 /* Open FILE with access OFLAG.  Interpret relative paths relative to
  30    the directory associated with FD.  If OFLAG includes O_CREAT, a
  31    third argument is the file protection.  */
  32 int
  33 __openat (fd, file, oflag)
  34      int fd;
  35      const char *file;
  36      int oflag;
  37 {
  38   int mode;
  39   io_t port;
  40
  41   if (oflag & O_CREAT)
  42     {
  43       va_list arg;
  44       va_start (arg, oflag);
  45       mode = va_arg (arg, int);
  46       va_end (arg);
  47     }
  48   else
  49     mode = 0;
  50
  51   port = __file_name_lookup_at (fd, 0, file, oflag, mode);
  52   if (port == MACH_PORT_NULL)
  53     return -1;
  54
  55   return _hurd_intern_fd (port, oflag, 1);
  56 }
  57 libc_hidden_def (__openat)
  58 weak_alias (__openat, openat)
  59
  60 int
  61 __openat_2 (fd, file, oflag)
  62      int fd;
  63      const char *file;
  64      int oflag;
  65 {
  66   if (oflag & O_CREAT)
  67     __fortify_fail ("invalid openat call: O_CREAT without mode");
  68
  69   return __openat (fd, file, oflag);
  70 }
  71
  72 /* openat64 is just the same as openat for us.  */
  73 weak_alias (__openat, __openat64)
  74 libc_hidden_weak (__openat64)
  75 weak_alias (__openat, openat64)
  76 strong_alias (__openat_2, __openat64_2)