source: trunk/server/source4/ntvfs/sysdep/sys_notify.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 3.6 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Copyright (C) Andrew Tridgell 2006
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20/*
21 abstract the various kernel interfaces to change notify into a
22 single Samba friendly interface
23*/
24
25#include "includes.h"
26#include "system/filesys.h"
27#include "ntvfs/sysdep/sys_notify.h"
28#include <tevent.h>
29#include "../lib/util/dlinklist.h"
30#include "param/param.h"
31
32/* list of registered backends */
33static struct sys_notify_backend *backends;
34static uint32_t num_backends;
35
36#define NOTIFY_BACKEND "notify:backend"
37
38/*
39 initialise a system change notify backend
40*/
41_PUBLIC_ struct sys_notify_context *sys_notify_context_create(struct share_config *scfg,
42 TALLOC_CTX *mem_ctx,
43 struct tevent_context *ev)
44{
45 struct sys_notify_context *ctx;
46 const char *bname;
47 int i;
48
49 if (num_backends == 0) {
50 return NULL;
51 }
52
53 if (ev == NULL) {
54 return NULL;
55 }
56
57 ctx = talloc_zero(mem_ctx, struct sys_notify_context);
58 if (ctx == NULL) {
59 return NULL;
60 }
61
62 ctx->ev = ev;
63
64 bname = share_string_option(scfg, NOTIFY_BACKEND, NULL);
65 if (!bname) {
66 if (num_backends) {
67 bname = backends[0].name;
68 } else {
69 bname = "__unknown__";
70 }
71 }
72
73 for (i=0;i<num_backends;i++) {
74 char *enable_opt_name;
75 bool enabled;
76
77 enable_opt_name = talloc_asprintf(mem_ctx, "notify:%s",
78 backends[i].name);
79 enabled = share_bool_option(scfg, enable_opt_name, true);
80 talloc_free(enable_opt_name);
81
82 if (!enabled)
83 continue;
84
85 if (strcasecmp(backends[i].name, bname) == 0) {
86 bname = backends[i].name;
87 break;
88 }
89 }
90
91 ctx->name = bname;
92 ctx->notify_watch = NULL;
93
94 if (i < num_backends) {
95 ctx->notify_watch = backends[i].notify_watch;
96 }
97
98 return ctx;
99}
100
101/*
102 add a watch
103
104 note that this call must modify the e->filter and e->subdir_filter
105 bits to remove ones handled by this backend. Any remaining bits will
106 be handled by the generic notify layer
107*/
108_PUBLIC_ NTSTATUS sys_notify_watch(struct sys_notify_context *ctx,
109 struct notify_entry *e,
110 sys_notify_callback_t callback,
111 void *private_data, void *handle)
112{
113 if (!ctx->notify_watch) {
114 return NT_STATUS_INVALID_SYSTEM_SERVICE;
115 }
116 return ctx->notify_watch(ctx, e, callback, private_data, handle);
117}
118
119/*
120 register a notify backend
121*/
122_PUBLIC_ NTSTATUS sys_notify_register(struct sys_notify_backend *backend)
123{
124 struct sys_notify_backend *b;
125 b = talloc_realloc(talloc_autofree_context(), backends,
126 struct sys_notify_backend, num_backends+1);
127 NT_STATUS_HAVE_NO_MEMORY(b);
128 backends = b;
129 backends[num_backends] = *backend;
130 num_backends++;
131 return NT_STATUS_OK;
132}
133
134_PUBLIC_ NTSTATUS sys_notify_init(void)
135{
136 static bool initialized = false;
137#define _MODULE_PROTO(init) extern NTSTATUS init(void);
138 STATIC_sys_notify_MODULES_PROTO;
139 init_module_fn static_init[] = { STATIC_sys_notify_MODULES };
140
141 if (initialized) return NT_STATUS_OK;
142 initialized = true;
143
144 run_init_functions(static_init);
145
146 return NT_STATUS_OK;
147}
Note: See TracBrowser for help on using the repository browser.