hurd/lookup-at.c

   1 /* Lookup helper function for Hurd implementation of *at functions.
   2    Copyright (C) 2006-2018 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 <hurd.h>
  20 #include <hurd/lookup.h>
  21 #include <hurd/fd.h>
  22 #include <string.h>
  23 #include <fcntl.h>
  24
  25 file_t
  26 __file_name_lookup_at (int fd, int at_flags,
  27                        const char *file_name, int flags, mode_t mode)
  28 {
  29   error_t err;
  30   file_t result;
  31
  32   err = __hurd_at_flags (&at_flags, &flags);
  33   if (err)
  34     return (__hurd_fail (err), MACH_PORT_NULL);
  35
  36   if (fd == AT_FDCWD || file_name[0] == '/')
  37     return __file_name_lookup (file_name, flags, mode);
  38
  39   file_t startdir;
  40   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  41     {
  42       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  43               _hurd_ports_use (which, operate));
  44     }
  45
  46   err = HURD_DPORT_USE (fd, (startdir = port,
  47                              __hurd_file_name_lookup (&use_init_port,
  48                                                       &__getdport, NULL,
  49                                                       file_name,
  50                                                       flags,
  51                                                       mode & ~_hurd_umask,
  52                                                       &result)));
  53
  54   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  55 }
  56
  57 file_t
  58 __file_name_split_at (int fd, const char *file_name, char **name)
  59 {
  60   error_t err;
  61   file_t result;
  62
  63   if (fd == AT_FDCWD || file_name[0] == '/')
  64     return __file_name_split (file_name, name);
  65
  66   err = __hurd_file_name_split (&_hurd_ports_use, &__getdport, 0,
  67                                 file_name, &result, name);
  68
  69   file_t startdir;
  70   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  71   {
  72     return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  73             _hurd_ports_use (which, operate));
  74   }
  75
  76   err = HURD_DPORT_USE (fd, (startdir = port,
  77                              __hurd_file_name_split (&use_init_port,
  78                                                      &__getdport, 0,
  79                                                      file_name,
  80                                                      &result, name)));
  81
  82   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
  83 }
  84
  85 file_t
  86 __directory_name_split_at (int fd, const char *directory_name, char **name)
  87 {
  88   error_t err;
  89   file_t result;
  90
  91   if (fd == AT_FDCWD || directory_name[0] == '/')
  92     return __directory_name_split (directory_name, name);
  93
  94   file_t startdir;
  95   error_t use_init_port (int which, error_t (*operate) (mach_port_t))
  96     {
  97       return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
  98               _hurd_ports_use (which, operate));
  99     }
 100
 101   err = HURD_DPORT_USE (fd, (startdir = port,
 102                              __hurd_directory_name_split (&use_init_port,
 103                                                           &__getdport, 0,
 104                                                           directory_name,
 105                                                           &result, name)));
 106
 107   return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
 108 }