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/*
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;
}
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