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/* Duplicate a protid
Copyright (C) 1993,94,95,96,2001 Free Software Foundation, Inc.
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 the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include "priv.h"
/* Return a duplicate of CRED in DUP, sharing the same peropen and hook. A
non-null hook may be used to detect that this is a duplicate by
trivfs_protid_create_hook. */
error_t
trivfs_protid_dup (struct trivfs_protid *cred, struct trivfs_protid **dup)
{
struct trivfs_protid *new;
error_t err = ports_create_port (cred->po->cntl->protid_class,
cred->po->cntl->protid_bucket,
sizeof (struct trivfs_protid),
&new);
if (! err)
{
pthread_mutex_lock (&cred->po->cntl->lock);
new->po = cred->po;
new->po->refcnt++;
pthread_mutex_unlock (&cred->po->cntl->lock);
new->isroot = cred->isroot;
err = iohelp_dup_iouser (&new->user, cred->user);
if (err)
{
ports_port_deref (new);
return err;
}
new->realnode = cred->realnode;
mach_port_mod_refs (mach_task_self (), new->realnode,
MACH_PORT_RIGHT_SEND, 1);
new->hook = cred->hook;
if (trivfs_protid_create_hook)
err = (*trivfs_protid_create_hook) (new);
if (err)
{
mach_port_deallocate (mach_task_self (), new->realnode);
/* Signal that the user destroy hook shouldn't be called on NEW. */
new->realnode = MACH_PORT_NULL;
ports_port_deref (new);
}
else
*dup = new;
}
return err;
}
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