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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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
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 "lib/events/events.h"
#include "dlinklist.h"
/* list of registered backends */
static struct sys_notify_backend *backends;
static uint32_t num_backends;
/*
initialise a system change notify backend
*/
struct sys_notify_context *sys_notify_init(int snum,
TALLOC_CTX *mem_ctx,
struct event_context *ev)
{
struct sys_notify_context *ctx;
const char *bname;
struct sys_notify_backend *b;
int i;
if (num_backends == 0) {
return NULL;
}
if (ev == NULL) {
ev = event_context_find(mem_ctx);
}
ctx = talloc_zero(mem_ctx, struct sys_notify_context);
if (ctx == NULL) {
return NULL;
}
ctx->ev = ev;
bname = lp_parm_string(snum, "notify", "backend");
if (!bname) {
if (num_backends) {
bname = backends[0].name;
} else {
bname = "__unknown__";
}
}
for (i=0;i<num_backends;i++) {
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
*/
NTSTATUS sys_notify_watch(struct sys_notify_context *ctx, struct notify_entry *e,
sys_notify_callback_t callback, void *private, void **handle)
{
if (!ctx->notify_watch) {
return NT_STATUS_INVALID_SYSTEM_SERVICE;
}
return ctx->notify_watch(ctx, e, callback, private, handle);
}
/*
register a notify backend
*/
NTSTATUS sys_notify_register(struct sys_notify_backend *backend)
{
struct sys_notify_backend *b;
b = talloc_realloc(talloc_autofree_context(), 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;
}
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