hurd/lookup-at.c

   1 /* Lookup helper function for Hurd implementation of *at functions.
   2    Copyright (C) 2006,2010 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   if ((at_flags & AT_SYMLINK_FOLLOW) && (at_flags & AT_SYMLINK_NOFOLLOW))
  34     return (__hurd_fail (EINVAL), MACH_PORT_NULL);
  35
  36   flags |= (at_flags & AT_SYMLINK_NOFOLLOW) ? O_NOLINK : 0;
  37   at_flags &= ~AT_SYMLINK_NOFOLLOW;
  38   if (at_flags & AT_SYMLINK_FOLLOW)
  39     flags &= ~O_NOLINK;
  40   at_flags &= ~AT_SYMLINK_FOLLOW;
  41   if (at_flags != 0)
  42     return (__hurd_fail (EINVAL), MACH_PORT_NULL);
  43
  44   if (fd == AT_FDCWD || file_name[0] == '/')
  45     return __file_name_lookup (file_name, flags, mode);
  46
  47   file_t startdir;
  48   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  49     {
  50       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  51               _hurd_ports_use (which, operate));
  52     }
  53
  54   err = HURD_DPORT_USE (fd, (startdir = port,
  55                              __hurd_file_name_lookup (&use_init_port,
  56                                                       &__getdport, NULL,
  57                                                       file_name,
  58                                                       flags,
  59                                                       mode & ~_hurd_umask,
  60                                                       &result)));
  61
  62   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  63 }
  64
  65 file_t
  66 __file_name_split_at (int fd, const char *file_name, char **name)
  67 {
  68   error_t err;
  69   file_t result;
  70
  71   if (fd == AT_FDCWD || file_name[0] == '/')
  72     return __file_name_split (file_name, name);
  73
  74   err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
  75                                 file_name, &result, name);
  76
  77   file_t startdir;
  78   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  79   {
  80     return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  81             _hurd_ports_use (which, operate));
  82   }
  83
  84   err = HURD_DPORT_USE (fd, (startdir = port,
  85                              __hurd_file_name_split (&use_init_port,
  86                                                      &__getdport, 0,
  87                                                      file_name,
  88                                                      &result, name)));
  89
  90   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  91 }
  92
  93 file_t
  94 __directory_name_split_at (int fd, const char *directory_name, char **name)
  95 {
  96   error_t err;
  97   file_t result;
  98
  99   if (fd == AT_FDCWD || directory_name[0] == '/')
 100     return __directory_name_split (directory_name, name);
 101
 102   file_t startdir;
 103   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
 104     {
 105       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
 106               _hurd_ports_use (which, operate));
 107     }
 108
 109   err = HURD_DPORT_USE (fd, (startdir = port,
 110                              __hurd_directory_name_split (&use_init_port,
 111                                                           &__getdport, 0,
 112                                                           directory_name,
 113                                                           &result, name)));
 114
 115   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
 116 }