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-rw-r--r--libtrivfs/protid-dup.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/libtrivfs/protid-dup.c b/libtrivfs/protid-dup.c
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+++ b/libtrivfs/protid-dup.c
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+/* Duplicate a protid
+
+ Copyright (C) 1993, 1994, 1995 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> /* For bcopy() */
+
+#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_peropen_create_hook. */
+error_t
+trivfs_protid_dup (struct trivfs_protid *cred, struct trivfs_protid **dup)
+{
+ error_t err = 0;
+ struct trivfs_protid *new =
+ ports_allocate_port (cred->po->cntl->protid_bucket,
+ sizeof (struct trivfs_protid),
+ cred->po->cntl->protid_class);
+
+ mutex_lock (&cred->po->cntl->lock);
+ new->po = cred->po;
+ new->po->refcnt++;
+ mutex_unlock (&cred->po->cntl->lock);
+
+ new->isroot = cred->isroot;
+
+ new->uids = malloc (cred->nuids * sizeof (uid_t));
+ bcopy (cred->uids, new->uids, cred->nuids * sizeof (uid_t));
+ new->nuids = cred->nuids;
+
+ new->gids = malloc (cred->ngids * sizeof (gid_t));
+ bcopy (cred->gids, new->gids, cred->ngids * sizeof (uid_t));
+ new->ngids = cred->ngids;
+
+ 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;
+}