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/*
Copyright (C) 1995 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 <assert-backtrace.h>
error_t
fshelp_fetch_control (struct transbox *box,
mach_port_t *control)
{
error_t err = 0;
*control = box->active;
if (*control != MACH_PORT_NULL)
err = mach_port_mod_refs (mach_task_self (), *control,
MACH_PORT_RIGHT_SEND, 1);
if (err == KERN_INVALID_RIGHT)
*control = box->active = MACH_PORT_NULL;
return err;
}
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