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/* Hurd unionfs
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
Written by Moritz Schulte <moritz@duesseldorf.ccc.de>.
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 of the
License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA. */
#define _GNU_SOURCE
#include <hurd/netfs.h>
#include <error.h>
#include <dirent.h>
#include <errno.h>
#include <sys/mman.h>
#include <stddef.h>
#include "lib.h"
/* Lock, which must be held, during printing of debugging
messages. */
struct mutex debug_msg_lock = MUTEX_INITIALIZER;
/* Fetch directory entries for DIR; store the raw data as returned by
the dir_readdir RPC in *DIRENT_DATA, the size of *DIRENT_DATA in
*DIRENT_DATA_SIZE and a list of pointers to the dirent structures
in *DIRENT_LIST. */
error_t
dir_entries_get (file_t dir, char **dirent_data,
size_t *dirent_data_size, struct dirent ***dirent_list)
{
error_t err;
size_t data_size;
int entries_num;
char *data;
err = dir_readdir (dir, &data, &data_size, 0, -1, 0, &entries_num);
if (! err)
{
struct dirent **list;
list = malloc (sizeof (struct dirent *) * (entries_num + 1));
if (list)
{
struct dirent *dp;
int i;
for (i = 0, dp = (struct dirent *) data;
i < entries_num;
i++, dp = (struct dirent *) ((char *) dp + dp->d_reclen))
*(list + i) = dp;
*(list + i) = NULL;
*dirent_data = data;
*dirent_data_size = data_size;
*dirent_list = list;
}
else
{
munmap (data, data_size);
err = ENOMEM;
}
}
return err;
}
/* Lookup the file named NAME beneath DIR (or the cwd, if DIR is not a
valid port. Try to open with FLAGS0 first, and if that fails with
FLAGS1; MODE is the mode to user for newly created files. On
success, stat the looked up port and store it in *PORT, the
according stat information are stored in *STAT. */
error_t
file_lookup (file_t dir, char *name, int flags0, int flags1,
int mode, file_t *port, struct stat *stat)
{
error_t err;
file_t p;
struct stat s;
file_t do_file_lookup (file_t d, char *n, int f, int m)
{
if (port_valid (d))
p = file_name_lookup_under (d, n, f, m);
else if (errno == EACCES)
p = file_name_lookup (n, f, m);
return p;
}
p = do_file_lookup (dir, name, flags0, mode);
if (! port_valid (p))
p = do_file_lookup (dir, name, flags1, mode);
if (port_valid (p))
{
if (stat)
{
err = io_stat (p, &s);
if (err)
port_dealloc (p);
}
}
else
err = errno;
if (! err)
{
*port = p;
if (stat)
*stat = s;
}
return err;
}
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