summaryrefslogtreecommitdiff
path: root/libdiskfs/file-getlinknode.c
blob: 8c10f62b82d8b067a99628b3594cf5865dd1f754 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/* libdiskfs implementation of fs.defs: file_getlinknode
   Copyright (C) 1992, 1993, 1994 Free Software Foundation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "priv.h"
#include "fs_S.h"

/* Implement file_getlinknode as described in <hurd/fs.defs>. */
error_t
diskfs_S_file_getlinknode (struct protid *cred,
			   file_t *port,
			   mach_msg_type_name_t *portpoly)
{
  struct node *np;

  if (!cred)
    return EOPNOTSUPP;
  
  np = cred->po->np;
  if (np == diskfs_root_node)
    return EBUSY;
  
  /* XXX -- this is wrong; port management code for protids
     only allows a port to be given out once; we need to
     send a new protid unfortunately. */
  *port = cred->pi.port;
  *portpoly = MACH_MSG_TYPE_MAKE_SEND;
  return 0;
}