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/* Some handy utility routines for fsys control ports
Copyright (C) 1996, 1999 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <errno.h>
#include <argz.h>
#include <mach.h>
#include <hurd/fsys.h>
/* Make FSYS readonly or writable. */
error_t
fsys_set_readonly (fsys_t fsys, int readonly)
{
error_t err;
char *opts = readonly ? "--readonly" : "--writable";
size_t opts_len = strlen (opts) + 1;
err = fsys_set_options (fsys, opts, opts_len, 0);
if (err == EINVAL)
err = EOPNOTSUPP;
return err;
}
/* Ask FSYS whether it's readonly, returning the result in READONLY; we don't
really have a good method for this, other than asking for it's options and
looking for `--readonly' or `--writable'. If we see neither, return
EOPNOTSUPP. */
error_t
fsys_get_readonly (fsys_t fsys, int *readonly)
{
error_t err;
char _opts[200], *opts = _opts;
size_t opts_len = sizeof opts;
err = fsys_get_options (fsys, &opts, &opts_len);
if (! err)
{
char *opt;
int ok = 0;
for (opt = opts
; !ok && opt && opt < opts + opts_len
; opt = argz_next (opts, opts_len, opt))
if (strcasecmp (opt, "--readonly") == 0)
{
*readonly = 1;
ok = 1;
}
else if (strcasecmp (opt, "--writable") == 0)
{
*readonly = 0;
ok = 1;
}
if (! ok)
err = EOPNOTSUPP; /* So far as we know... */
if (opts != _opts)
/* Free out-of-line memory returned by fsys_get_options. */
munmap (opts, opts_len);
}
return err;
}
/* Tell FSYS to remount itself. */
error_t
fsys_update (fsys_t fsys, int readonly)
{
error_t err;
char *opts = "--update";
size_t opts_len = strlen (opts) + 1;
err = fsys_set_options (fsys, opts, opts_len, 0);
if (err == EINVAL)
err = EOPNOTSUPP;
return err;
}
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