1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
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"
/* 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(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(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;
}
_PUBLIC_ NTSTATUS sys_notify_init(void)
{
static bool initialized = false;
#define _MODULE_PROTO(init) extern NTSTATUS init(void);
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(static_init);
return NT_STATUS_OK;
}
|
