Reduced control channel code duplication.

2009-02-17  David Smith  <dsmith@redhat.com>

	* control.c: Contains generic control channel functions.
	* procfs.c: Specific procfs control channel functions.  All generic
	control channel functions moved to control.c.
	* debugfs.c: New file containing debugfs specific control channel
	functions.
	* control.h: New file.
	* transport.c: Updated file inclusion.

1 files changed, 45 insertions, 0 deletions

diff --git a/runtime/transport/debugfs.c b/runtime/transport/debugfs.c
new file mode 100644
index 00000000..dc651a56
--- /dev/null
+++ b/runtime/transport/debugfs.c
@@ -0,0 +1,45 @@
+/* -*- linux-c -*-
+ *
+ * debugfs functions
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This file is part of systemtap, and is free software.  You can
+ * redistribute it and/or modify it under the terms of the GNU General
+ * Public License (GPL); either version 2, or (at your option) any
+ * later version.
+ */
+
+#define STP_DEFAULT_BUFFERS 50
+
+inline static int _stp_ctl_write_fs(int type, void *data, unsigned len)
+{
+	return 0;
+}
+
+static struct dentry *_stp_cmd_file = NULL;
+
+static int _stp_register_ctl_channel_fs(void)
+{
+	if (_stp_utt == NULL) {
+		errk("_expected _stp_utt to be set.\n");
+		return -1;
+	}
+
+	/* create [debugfs]/systemtap/module_name/.cmd  */
+	_stp_cmd_file = debugfs_create_file(".cmd", 0600, _stp_utt->dir,
+					    NULL, &_stp_ctl_fops_cmd);
+	if (_stp_cmd_file == NULL) {
+		errk("Error creating systemtap debugfs entries.\n");
+		return -1;
+	}
+	_stp_cmd_file->d_inode->i_uid = _stp_uid;
+	_stp_cmd_file->d_inode->i_gid = _stp_gid;
+
+	return 0;
+}
+
+static void _stp_unregister_ctl_channel_fs(void)
+{
+	if (_stp_cmd_file)
+		debugfs_remove(_stp_cmd_file);
+}