1 files changed, 137 insertions, 0 deletions
diff --git a/source4/samba/process_model.c b/source4/samba/process_model.c
new file mode 100644
index 0000000..754da79
--- /dev/null
+++ b/source4/samba/process_model.c
@@ -0,0 +1,137 @@
+/* 
+   Unix SMB/CIFS implementation.
+   process model manager - main loop
+   Copyright (C) Andrew Tridgell 1992-2003
+   Copyright (C) James J Myers 2003 <myersjj@samba.org>
+   
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "samba/process_model.h"
+#include "param/param.h"
+#include "lib/util/samba_modules.h"
+
+/* the list of currently registered process models */
+static struct process_model {
+	const struct model_ops *ops;
+	bool initialised;
+} *models = NULL;
+static int num_models;
+
+
+/*
+  return the operations structure for a named backend of the specified type
+*/
+static struct process_model *process_model_byname(const char *name)
+{
+	int i;
+
+	for (i=0;i<num_models;i++) {
+		if (strcmp(models[i].ops->name, name) == 0) {
+			return &models[i];
+		}
+	}
+
+	return NULL;
+}
+
+
+/*
+  setup the events for the chosen process model
+*/
+_PUBLIC_ const struct model_ops *process_model_startup(const char *model)
+{
+	struct process_model *m;
+
+	m = process_model_byname(model);
+	if (m == NULL) {
+		DBG_ERR("Unknown process model '%s'\n", model);
+		exit(-1);
+	}
+
+	if (!m->initialised) {
+		m->initialised = true;
+		m->ops->model_init();
+	}
+
+	return m->ops;
+}
+
+/*
+  register a process model. 
+
+  The 'name' can be later used by other backends to find the operations
+  structure for this backend.  
+*/
+_PUBLIC_ NTSTATUS register_process_model(const struct model_ops *ops)
+{
+	if (process_model_byname(ops->name) != NULL) {
+		/* its already registered! */
+		DBG_ERR("PROCESS_MODEL '%s' already registered\n", ops->name);
+		return NT_STATUS_OBJECT_NAME_COLLISION;
+	}
+
+	models = talloc_realloc(NULL, models, struct process_model, num_models+1);
+	if (!models) {
+		smb_panic("out of memory in register_process_model");
+	}
+
+	models[num_models].ops = ops;
+	models[num_models].initialised = false;
+
+	num_models++;
+
+	DBG_NOTICE("PROCESS_MODEL '%s' registered\n", ops->name);
+
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS process_model_init(struct loadparm_context *lp_ctx)
+{
+#define _MODULE_PROTO(init) extern NTSTATUS init(TALLOC_CTX *);
+	STATIC_process_model_MODULES_PROTO;
+	init_module_fn static_init[] = { STATIC_process_model_MODULES };
+	init_module_fn *shared_init;
+	static bool initialised;
+
+	if (initialised) {
+		return NT_STATUS_OK;
+	}
+	initialised = true;
+
+	shared_init = load_samba_modules(NULL, "process_model");
+	
+	run_init_functions(NULL, static_init);
+	run_init_functions(NULL, shared_init);
+
+	talloc_free(shared_init);
+
+	return NT_STATUS_OK;
+}
+
+/*
+  return the PROCESS_MODEL module version, and the size of some critical types
+  This can be used by process model modules to either detect compilation errors, or provide
+  multiple implementations for different smbd compilation options in one module
+*/
+const struct process_model_critical_sizes *process_model_version(void)
+{
+	static const struct process_model_critical_sizes critical_sizes = {
+		PROCESS_MODEL_VERSION,
+		sizeof(struct model_ops)
+	};
+
+	return &critical_sizes;
+}