1 files changed, 90 insertions, 0 deletions
diff --git a/devio/open.c b/devio/open.c
new file mode 100644
index 00000000..64d62bfe
--- /dev/null
+++ b/devio/open.c
@@ -0,0 +1,90 @@
+/* Per-open information for devio.
+
+   Copyright (C) 1995 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 "open.h"
+#include "window.h"
+#include "dev.h"
+
+/* ---------------------------------------------------------------- */
+
+/* Returns a new per-open structure for the device DEV in OPEN.  If an error
+   occurs, the error-code is returned, otherwise 0.  */
+error_t
+open_create(struct dev *dev, struct open **open)
+{
+  error_t err;
+
+  *open = malloc(sizeof(struct open));
+
+  if (*open == NULL)
+    return ENOMEM;
+
+  (*open)->dev = dev;
+
+  err = io_state_init(&(*open)->io_state, dev);
+
+  if (!err && dev_is(dev, DEV_BUFFERED) && !dev_is(dev, DEV_SERIAL))
+    /* A random-access buffered device -- use a pager to do i/o to it.  */
+    {
+      mach_port_t memobj;
+      err = dev_get_memory_object(dev, &memobj);
+      if (!err)
+	err =
+	  window_create(memobj, 0, 0, dev_is(dev, DEV_READONLY),
+			&(*open)->window); /* XXX sizes */
+      if (err)
+	{
+	  mach_port_destroy(mach_task_self(), memobj);
+	  io_state_finalize(&(*open)->io_state);
+	}
+    }
+  else
+    (*open)->window = NULL;
+
+  if (err)
+    free(*open);
+
+  return err;
+}
+
+/* ---------------------------------------------------------------- */
+
+/* Free OPEN and any resources it holds.  */
+void
+open_free(struct open *open)
+{
+  io_state_finalize(&open->io_state);
+  window_free(open->window);
+  free(open);
+}
+
+
+/* ---------------------------------------------------------------- */
+
+/* Returns the appropiate io_state object for OPEN (which may be either
+   per-open or a per-device depending on the device).  */
+struct io_state *
+open_get_io_state(struct open *open)
+{
+  return
+    dev_is(open->dev, DEV_SERIAL) ? &open->dev->io_state : &open->io_state;
+}