1 files changed, 85 insertions, 0 deletions
diff --git a/libtrivfs/dir-lookup.c b/libtrivfs/dir-lookup.c
new file mode 100644
index 00000000..604df8cc
--- /dev/null
+++ b/libtrivfs/dir-lookup.c
@@ -0,0 +1,85 @@
+/*
+   Copyright (C) 1994, 1998, 1999 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 "fs_S.h"
+#include <assert.h>
+#include <fcntl.h>
+#include <string.h>
+
+kern_return_t
+trivfs_S_dir_lookup (struct trivfs_protid *cred,
+		     mach_port_t reply, mach_msg_type_name_t reply_type,
+		     char *filename,
+		     int flags,
+		     mode_t mode,
+		     retry_type *retry_type,
+		     char *retry_name,
+		     mach_port_t *retrypt,
+		     mach_msg_type_name_t *retrypt_type)
+{
+  int perms;
+  error_t err;
+  struct trivfs_protid *newcred;
+
+  if (!cred)
+    return EOPNOTSUPP;
+
+  if (filename[0])
+    return ENOTDIR;
+
+  /* This is a null-pathname "reopen" call; do the right thing. */
+
+  /* Burn off flags we don't actually implement */
+  flags &= O_HURD;
+  flags &= ~(O_CREAT|O_EXCL|O_NOLINK|O_NOTRANS);
+
+  /* Validate permissions */
+  if (! trivfs_check_access_hook)
+    file_check_access (cred->realnode, &perms);
+  else
+    (*trivfs_check_access_hook) (cred->po->cntl, cred->user,
+				 cred->realnode, &perms);
+  if ((flags & (O_READ|O_WRITE|O_EXEC) & perms)
+      != (flags & (O_READ|O_WRITE|O_EXEC)))
+    return EACCES;
+
+  /* Execute the open */
+  err = 0;
+  if (trivfs_check_open_hook)
+    err = (*trivfs_check_open_hook) (cred->po->cntl, cred->user, flags);
+  if (!err)
+    {
+      struct iouser *user = iohelp_dup_iouser (cred->user);
+      err = trivfs_open (cred->po->cntl, user, flags,
+			 cred->realnode, &newcred);
+      if (err)
+	iohelp_free_iouser (user);
+      else
+	mach_port_mod_refs (mach_task_self (), cred->realnode,
+			    MACH_PORT_RIGHT_SEND, +1);
+    }
+  if (err)
+    return err;
+
+  *retry_type = FS_RETRY_NORMAL;
+  *retry_name = '\0';
+  *retrypt = ports_get_right (newcred);
+  *retrypt_type = MACH_MSG_TYPE_MAKE_SEND;
+  ports_port_deref (newcred);
+  return 0;
+}