1 files changed, 151 insertions, 0 deletions
diff --git a/source4/ntvfs/sysdep/sys_notify.c b/source4/ntvfs/sysdep/sys_notify.c
new file mode 100644
index 0000000..6991461
--- /dev/null
+++ b/source4/ntvfs/sysdep/sys_notify.c
@@ -0,0 +1,151 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Andrew Tridgell 2006
+   
+   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/>.
+*/
+
+/*
+  abstract the various kernel interfaces to change notify into a
+  single Samba friendly interface
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "ntvfs/sysdep/sys_notify.h"
+#include <tevent.h>
+#include "../lib/util/dlinklist.h"
+#include "param/param.h"
+#include "lib/util/samba_modules.h"
+
+#undef strcasecmp
+
+/* list of registered backends */
+static struct sys_notify_backend *backends;
+static uint32_t num_backends;
+
+#define NOTIFY_BACKEND	"notify:backend"
+
+/*
+  initialise a system change notify backend
+*/
+_PUBLIC_ struct sys_notify_context *sys_notify_context_create(struct share_config *scfg,
+							      TALLOC_CTX *mem_ctx, 
+							      struct tevent_context *ev)
+{
+	struct sys_notify_context *ctx;
+	const char *bname;
+	int i;
+
+	if (num_backends == 0) {
+		return NULL;
+	}
+
+	if (ev == NULL) {
+		return NULL;
+	}
+
+	ctx = talloc_zero(mem_ctx, struct sys_notify_context);
+	if (ctx == NULL) {
+		return NULL;
+	}
+
+	ctx->ev = ev;
+
+	bname = share_string_option(ctx, scfg, NOTIFY_BACKEND, NULL);
+	if (!bname) {
+		if (num_backends) {
+			bname = backends[0].name;
+		} else {
+			bname = "__unknown__";
+		}
+	}
+
+	for (i=0;i<num_backends;i++) {
+		char *enable_opt_name;
+		bool enabled;
+		
+		enable_opt_name = talloc_asprintf(mem_ctx, "notify:%s", 
+										  backends[i].name);
+		enabled = share_bool_option(scfg, enable_opt_name, true);
+		talloc_free(enable_opt_name);
+
+		if (!enabled) 
+			continue;
+
+		if (strcasecmp(backends[i].name, bname) == 0) {
+			bname = backends[i].name;
+			break;
+		}
+	}
+
+	ctx->name = bname;
+	ctx->notify_watch = NULL;
+
+	if (i < num_backends) {
+		ctx->notify_watch = backends[i].notify_watch;
+	}
+
+	return ctx;
+}
+
+/*
+  add a watch
+
+  note that this call must modify the e->filter and e->subdir_filter
+  bits to remove ones handled by this backend. Any remaining bits will
+  be handled by the generic notify layer
+*/
+_PUBLIC_ NTSTATUS sys_notify_watch(struct sys_notify_context *ctx,
+				   struct notify_entry *e,
+				   sys_notify_callback_t callback,
+				   void *private_data, void *handle)
+{
+	if (!ctx->notify_watch) {
+		return NT_STATUS_INVALID_SYSTEM_SERVICE;
+	}
+	return ctx->notify_watch(ctx, e, callback, private_data, handle);
+}
+
+/*
+  register a notify backend
+*/
+_PUBLIC_ NTSTATUS sys_notify_register(TALLOC_CTX *ctx,
+			struct sys_notify_backend *backend)
+{
+	struct sys_notify_backend *b;
+	b = talloc_realloc(ctx, backends,
+			   struct sys_notify_backend, num_backends+1);
+	NT_STATUS_HAVE_NO_MEMORY(b);
+	backends = b;
+	backends[num_backends] = *backend;
+	num_backends++;
+	return NT_STATUS_OK;
+}
+
+_PUBLIC_ NTSTATUS sys_notify_init(void)
+{
+	static bool initialized = false;
+#define _MODULE_PROTO(init) extern NTSTATUS init(TALLOC_CTX *);
+	STATIC_sys_notify_MODULES_PROTO;
+	init_module_fn static_init[] = { STATIC_sys_notify_MODULES };
+
+	if (initialized) return NT_STATUS_OK;
+	initialized = true;
+
+	run_init_functions(NULL, static_init);
+	
+	return NT_STATUS_OK;
+}