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/* libdiskfs implementation of io.defs: io_pathconf
Copyright (C) 1992, 1993, 1994, 1995, 1999 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 <unistd.h>
#include "priv.h"
#include "io_S.h"
#include <dirent.h>
#include <limits.h>
/* Implement io_pathconf as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_pathconf (struct protid *cred,
int name,
int *value)
{
if (!cred)
return EOPNOTSUPP;
switch (name)
{
case _PC_LINK_MAX:
*value = diskfs_link_max;
break;
case _PC_MAX_CANON:
case _PC_MAX_INPUT:
case _PC_PIPE_BUF:
case _PC_VDISABLE:
case _PC_SOCK_MAXBUF:
case _PC_PATH_MAX:
case _PC_REC_MAX_XFER_SIZE:
case _PC_REC_INCR_XFER_SIZE:
case _PC_SYMLINK_MAX:
*value = -1;
break;
case _PC_NAME_MAX:
/* <hurd/hurd_types.defs> string_t constrains the upper bound.
The `struct dirent' format defined by libc further contrains it. */
#define D_NAMLEN_MAX (UCHAR_MAX * sizeof (((struct dirent *) 0)->d_namlen))
if (diskfs_name_max > D_NAMLEN_MAX || diskfs_name_max < 0)
diskfs_name_max = D_NAMLEN_MAX;
*value = diskfs_name_max;
break;
case _PC_NO_TRUNC: /* enforced in diskfs_lookup */
case _PC_2_SYMLINKS:
*value = 1; /* diskfs_name_max >= 0; */ /* see above */
break;
case _PC_CHOWN_RESTRICTED:
case _PC_SYNC_IO:
case _PC_ASYNC_IO:
*value = 1;
break;
case _PC_PRIO_IO:
*value = 0;
break;
case _PC_FILESIZEBITS:
*value = 32;
break;
case _PC_REC_MIN_XFER_SIZE:
case _PC_REC_XFER_ALIGN:
case _PC_ALLOC_SIZE_MIN:
*value = vm_page_size;
break;
default:
return EINVAL;
}
return 0;
}
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