1: /* Lookup helper function for Hurd implementation of *at functions.
    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 <hurd.h>
   21: #include <hurd/lookup.h>
   22: #include <hurd/fd.h>
   23: #include <string.h>
   24: #include <fcntl.h>
   25: 
   26: file_t
   27: __file_name_lookup_at (int fd, int at_flags,
   28:                        const char *file_name, int flags, mode_t mode)
   29: {
   30:   error_t err;
   31:   file_t result;
   32: 
   33:   flags |= (at_flags & AT_SYMLINK_NOFOLLOW) ? O_NOLINK : 0;
   34:   at_flags &= ~AT_SYMLINK_NOFOLLOW;
   35:   if (at_flags != 0)
   36:     return __hurd_fail (EINVAL);
   37: 
   38:   if (fd == AT_FDCWD || file_name[0] == '/')
   39:     return __file_name_lookup (file_name, flags, mode);
   40: 
   41:   file_t startdir;
   42:   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
   43:     {
   44:       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
   45:               _hurd_ports_use (which, operate));
   46:     }
   47: 
   48:   err = HURD_DPORT_USE (fd, (startdir = port,
   49:                              __hurd_file_name_lookup (&use_init_port,
   50:                                                       &__getdport, NULL,
   51:                                                       file_name,
   52:                                                       flags,
   53:                                                       mode & ~_hurd_umask,
   54:                                                       &result)));
   55: 
   56:   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
   57: }
   58: 
   59: file_t
   60: __file_name_split_at (int fd, const char *file_name, char **name)
   61: {
   62:   error_t err;
   63:   file_t result;
   64: 
   65:   if (fd == AT_FDCWD || file_name[0] == '/')
   66:     return __file_name_split (file_name, name);
   67: 
   68:   err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
   69:                                 file_name, &result, name);
   70: 
   71:   file_t startdir;
   72:   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
   73:   {
   74:     return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
   75:             _hurd_ports_use (which, operate));
   76:   }
   77: 
   78:   err = HURD_DPORT_USE (fd, (startdir = port,
   79:                              __hurd_file_name_split (&use_init_port,
   80:                                                      &__getdport, 0,
   81:                                                      file_name,
   82:                                                      &result, name)));
   83: 
   84:   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
   85: }
   86: 
   87: file_t
   88: __directory_name_split_at (int fd, const char *directory_name, char **name)
   89: {
   90:   error_t err;
   91:   file_t result;
   92: 
   93:   if (fd == AT_FDCWD || directory_name[0] == '/')
   94:     return __directory_name_split (directory_name, name);
   95: 
   96:   file_t startdir;
   97:   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
   98:     {
   99:       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  100:               _hurd_ports_use (which, operate));
  101:     }
  102: 
  103:   err = HURD_DPORT_USE (fd, (startdir = port,
  104:                              __hurd_directory_name_split (&use_init_port,
  105:                                                           &__getdport, 0,
  106:                                                           directory_name,
  107:                                                           &result, name)));
  108: 
  109:   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  110: }