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/*
Copyright (C) 1996, 1999, 2000, 2008 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd 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.
The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <string.h>
#include <stdio.h>
#include <hurd/paths.h>
#include "netfs.h"
#include "fs_S.h"
#include <sys/mman.h>
error_t
netfs_S_file_get_translator (struct protid *user,
char **trans,
mach_msg_type_number_t *translen)
{
struct node *np;
error_t err;
if (!user)
return EOPNOTSUPP;
np = user->po->np;
mutex_lock (&np->lock);
err = netfs_validate_stat (np, user->user);
if (err)
{
mutex_unlock (&np->lock);
return err;
}
if (S_ISLNK (np->nn_stat.st_mode))
{
unsigned int len = sizeof _HURD_SYMLINK + np->nn_stat.st_size + 1;
if (len > *translen)
*trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
memcpy (*trans, _HURD_SYMLINK, sizeof _HURD_SYMLINK);
err = netfs_attempt_readlink (user->user, np,
*trans + sizeof _HURD_SYMLINK);
if (!err)
{
(*trans)[sizeof _HURD_SYMLINK + np->nn_stat.st_size] = '\0';
*translen = len;
}
}
else if (S_ISCHR (np->nn_stat.st_mode) || S_ISBLK (np->nn_stat.st_mode))
{
char *buf;
unsigned int buflen;
buflen = asprintf (&buf, "%s%c%d%c%d",
(S_ISCHR (np->nn_stat.st_mode)
? _HURD_CHRDEV
: _HURD_BLKDEV),
'\0', major (np->nn_stat.st_rdev),
'\0', minor (np->nn_stat.st_rdev));
if (buflen < 0)
err = ENOMEM;
else
{
buflen++; /* terminating nul */
if (buflen > *translen)
*trans = mmap (0, buflen, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
memcpy (*trans, buf, buflen);
free (buf);
*translen = buflen;
err = 0;
}
}
else if (S_ISFIFO (np->nn_stat.st_mode))
{
unsigned int len;
len = sizeof _HURD_FIFO;
if (len > *translen)
*trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
memcpy (*trans, _HURD_FIFO, sizeof _HURD_FIFO);
*translen = len;
err = 0;
}
else if (S_ISSOCK (np->nn_stat.st_mode))
{
unsigned int len;
len = sizeof _HURD_IFSOCK;
if (len > *translen)
*trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
memcpy (*trans, _HURD_IFSOCK, sizeof _HURD_IFSOCK);
*translen = len;
err = 0;
}
else
err = EINVAL;
mutex_unlock (&np->lock);
return err;
}
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