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/*
Copyright (C) 1994 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 "priv.h"
#include "io_S.h"
/* Implement io_map_cntl as described in <hurd/io.defs>. */
error_t
S_io_map_cntl (struct protid *cred,
memory_object_t *ctlobj)
{
if (!cred)
return EOPNOTSUPP;
assert (__vm_page_size >= sizeof (struct shared_io));
mutex_lock (&cred->po->np->lock);
if (!cred->mapped)
{
default_pager_object_create (default_pager, &cred->shared_object,
__vm_page_size);
vm_map (mach_task_self (), (u_int *)&cred->mapped, __vm_page_size, 0, 1,
cred->shared_object, 0, 0, VM_PROT_READ|VM_PROT_WRITE,
VM_PROT_READ|VM_PROT_WRITE, 0);
cred->mapped->conch_status = USER_HAS_NOT_CONCH;
spin_lock_init (&cred->mapped->lock);
*ctlobj = cred->shared_object;
mutex_unlock (&cred->po->np->lock);
return 0;
}
else
{
mutex_unlock (&cred->po->np->lock);
return EBUSY;
}
}
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