hurd/lookup-at.c

   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 }