1 files changed, 88 insertions, 0 deletions
diff --git a/libtrivfs/startup.c b/libtrivfs/startup.c
new file mode 100644
index 00000000..4d76d47c
--- /dev/null
+++ b/libtrivfs/startup.c
@@ -0,0 +1,88 @@
+/* Contact parent filesystem and establish ourselves as the translator.
+
+   Copyright (C) 1995, 2000 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   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 <hurd.h>
+#include <hurd/fsys.h>
+#include <assert.h>
+
+#include "priv.h"
+
+/* Creates a control port for this filesystem and sends it to BOOTSTRAP with
+   fsys_startup.  CONTROL_TYPE is the ports library type for the control
+   port, and PROTID_TYPE is the type for ports representing opens of this
+   node.  If CONTROL isn't NULL, the trivfs control port is return in it.  If
+   any error occurs sending fsys_startup, it is returned, otherwise 0.
+   FLAGS specifies how to open the underlying node (O_*).  */
+error_t
+trivfs_startup(mach_port_t bootstrap, int flags,
+	       struct port_class *control_class,
+	       struct port_bucket *control_bucket,
+	       struct port_class *protid_class,
+	       struct port_bucket *protid_bucket,
+	       struct trivfs_control **control)
+{
+  mach_port_t underlying, right;
+  struct trivfs_control *fsys;
+  error_t err =
+    trivfs_create_control (MACH_PORT_NULL,
+			   control_class, control_bucket,
+			   protid_class, protid_bucket,
+			   &fsys);
+
+  if (err)
+    return err;
+
+  right = ports_get_send_right (fsys);
+
+  /* Contact whoever started us.  */
+  err = fsys_startup (bootstrap, flags, right, MACH_MSG_TYPE_COPY_SEND,
+		      &underlying);
+  mach_port_deallocate (mach_task_self (), right);
+
+  if (! err)
+    fsys->underlying = underlying;
+
+  ports_port_deref (fsys);
+
+  /* Pass back what we got, unless the caller doesn't want it.  */
+  if (!err && control)
+    *control = fsys;
+
+  /* Mark us as important.  */
+  if (! err)
+    {
+      mach_port_t proc = getproc ();
+      if (proc == MACH_PORT_NULL)
+	/* /hurd/exec uses libtrivfs.  We have no handle to the proc
+	   server in /hurd/exec when it does its handshake with the
+	   root filesystem, so fail graciously here.  */
+	return 0;
+
+      err = proc_mark_important (proc);
+      /* This might fail due to permissions or because the old proc
+	 server is still running, ignore any such errors.  */
+      if (err == EPERM || err == EMIG_BAD_ID)
+	err = 0;
+
+      mach_port_deallocate (mach_task_self (), proc);
+    }
+
+  return err;
+}