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/*
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
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 "fshelp.h"
#include <hurd/fsys.h>
error_t
fshelp_set_active (struct transbox *box,
mach_port_t active,
int excl)
{
int cancel;
if (excl)
{
if (box->flags & TRANSBOX_STARTING)
return EBUSY;
if (box->active != MACH_PORT_NULL)
/* It looks like there's an existing translator, but make sure. */
{
mach_port_urefs_t dead_refs;
error_t err =
mach_port_get_refs (mach_task_self (),
box->active, MACH_PORT_RIGHT_DEAD_NAME,
&dead_refs);
if (!err && dead_refs == 0)
/* Still active, we lose. */
return EBUSY;
}
}
while (box->flags & TRANSBOX_STARTING)
{
box->flags |= TRANSBOX_WANTED;
cancel = hurd_condition_wait (&box->wakeup, box->lock);
if (cancel)
return EINTR;
}
if (box->active != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), box->active);
box->active = active;
return 0;
}
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