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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/* rsyslog.c - the main entry point into rsyslog's runtime library (RTL)
*
* This module contains all function which work on a RTL global level. It's
* name is abbreviated to "rsrt" (rsyslog runtime).
*
* Please note that the runtime library tends to be plugin-safe. That is, it must be
* initialized by calling a global initialization function. However, that
* function checks if the library is already initialized and, if so, does
* nothing except incrementing a refeence count. Similarly, the deinit
* function does nothing as long as there are still other users (which
* is tracked via the refcount). As such, it is safe to call init and
* exit multiple times, as long as this are always matching calls. This
* capability is needed for a plugin system, where one plugin never
* knows what the other did. HOWEVER, as of this writing, not all runtime
* library objects may work cleanly without static global data (the
* debug system is a very good example of this). So while we aim at the
* ability to work well in a plugin environment, things may not really work
* out. If you intend to use the rsyslog runtime library inside plugins,
* you should investigate the situation in detail. Please note that the
* rsyslog project itself does not yet need this functionality - thus you
* can safely assume it is totally untested ;).
*
* rgerhards, 2008-04-17: I have now once again checked on the plugin-safety.
* Unfortunately, there is currently no hook at all with which we could
* abstract a global data instance class. As such, we can NOT make the
* runtime plugin-safe in the above-described sense. As the rsyslog
* project itself does not need this functionality (and it is quesationable
* if someone else ever will), we do currently do not make an effort to
* support it. So if you intend to use rsyslog runtime inside a non-rsyslog
* plugin system, be careful!
*
* The rsyslog runtime library is in general reentrant and thread-safe. There
* are some intentional exceptions (e.g. inside the msg object). These are
* documented. Any other threading and reentrency issue can be considered a bug.
*
* Module begun 2008-04-16 by Rainer Gerhards
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* The rsyslog runtime library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The rsyslog runtime library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "rsyslog.h"
#include "obj.h"
#include "stringbuf.h"
#include "wti.h"
#include "wtp.h"
#include "datetime.h"
#include "queue.h"
#include "conf.h"
#include "rsconf.h"
#include "glbl.h"
#include "errmsg.h"
#include "prop.h"
#include "rule.h"
#include "ruleset.h"
#include "parser.h"
#include "strgen.h"
#include "statsobj.h"
#include "atomic.h"
#ifdef HAVE_PTHREAD_SETSCHEDPARAM
struct sched_param default_sched_param;
pthread_attr_t default_thread_attr;
int default_thr_sched_policy;
#endif
/* forward definitions */
static rsRetVal dfltErrLogger(int, uchar *errMsg);
/* globally visible static data - see comment in rsyslog.h for details */
uchar *glblModPath; /* module load path */
rsRetVal (*glblErrLogger)(int, uchar*) = dfltErrLogger; /* the error logger to use by the errmsg module */
/* static data */
static int iRefCount = 0; /* our refcount - it MUST exist only once inside a process (not thread)
thus it is perfectly OK to use a static. MUST be initialized to 0! */
/* This is the default instance of the error logger. It simply writes the message
* to stderr. It is expected that this is replaced by the runtime user very early
* during startup (at least if the default is unsuitable). However, we provide a
* default so that we can log errors during the intial phase, most importantly
* during initialization. -- rgerhards. 2008-04-17
*/
static rsRetVal dfltErrLogger(int iErr, uchar *errMsg)
{
DEFiRet;
fprintf(stderr, "rsyslog runtime error(%d): %s\n", iErr, errMsg);
RETiRet;
}
/* set the error log function
* rgerhards, 2008-04-18
*/
rsRetVal
rsrtSetErrLogger(rsRetVal (*errLogger)(int, uchar*))
{
DEFiRet;
assert(errLogger != NULL);
glblErrLogger = errLogger;
RETiRet;
}
/* globally initialze the runtime system
* NOTE: this is NOT thread safe and must not be called concurrently. If that
* ever poses a problem, we may use proper mutex calls - not considered needed yet.
* If ppErrObj is provided, it receives a char pointer to the name of the object that
* caused the problem (if one occured). The caller must never free this pointer. If
* ppErrObj is NULL, no such information will be provided. pObjIF is the pointer to
* the "obj" object interface, which may be used to query any other rsyslog objects.
* rgerhards, 2008-04-16
*/
rsRetVal
rsrtInit(char **ppErrObj, obj_if_t *pObjIF)
{
DEFiRet;
if(iRefCount == 0) {
/* init runtime only if not yet done */
#ifdef HAVE_PTHREAD_SETSCHEDPARAM
CHKiRet(pthread_getschedparam(pthread_self(),
&default_thr_sched_policy,
&default_sched_param));
CHKiRet(pthread_attr_init(&default_thread_attr));
CHKiRet(pthread_attr_setschedpolicy(&default_thread_attr,
default_thr_sched_policy));
CHKiRet(pthread_attr_setschedparam(&default_thread_attr,
&default_sched_param));
CHKiRet(pthread_attr_setinheritsched(&default_thread_attr,
PTHREAD_EXPLICIT_SCHED));
#endif
if(ppErrObj != NULL) *ppErrObj = "obj";
CHKiRet(objClassInit(NULL)); /* *THIS* *MUST* always be the first class initilizer being called! */
CHKiRet(objGetObjInterface(pObjIF)); /* this provides the root pointer for all other queries */
/* initialize core classes. We must be very careful with the order of events. Some
* classes use others and if we do not initialize them in the right order, we may end
* up with an invalid call. The most important thing that can happen is that an error
* is detected and needs to be logged, wich in turn requires a broader number of classes
* to be available. The solution is that we take care in the order of calls AND use a
* class immediately after it is initialized. And, of course, we load those classes
* first that we use ourselfs... -- rgerhards, 2008-03-07
*/
if(ppErrObj != NULL) *ppErrObj = "statsobj";
CHKiRet(statsobjClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "prop";
CHKiRet(propClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "glbl";
CHKiRet(glblClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "msg";
CHKiRet(msgClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "rule";
CHKiRet(ruleClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "ruleset";
CHKiRet(rulesetClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "wti";
CHKiRet(wtiClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "wtp";
CHKiRet(wtpClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "queue";
CHKiRet(qqueueClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "conf";
CHKiRet(confClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "parser";
CHKiRet(parserClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "strgen";
CHKiRet(strgenClassInit(NULL));
if(ppErrObj != NULL) *ppErrObj = "rsconf";
CHKiRet(rsconfClassInit(NULL));
/* dummy "classes" */
if(ppErrObj != NULL) *ppErrObj = "str";
CHKiRet(strInit());
}
++iRefCount;
dbgprintf("rsyslog runtime initialized, version %s, current users %d\n", VERSION, iRefCount);
finalize_it:
RETiRet;
}
/* globally de-initialze the runtime system
* NOTE: this is NOT thread safe and must not be called concurrently. If that
* ever poses a problem, we may use proper mutex calls - not considered needed yet.
* This function must be provided with the caller's obj object pointer. This is
* automatically deinitialized by the runtime system.
* rgerhards, 2008-04-16
*/
rsRetVal
rsrtExit(void)
{
DEFiRet;
if(iRefCount == 1) {
/* do actual de-init only if we are the last runtime user */
confClassExit();
glblClassExit();
rulesetClassExit();
ruleClassExit();
objClassExit(); /* *THIS* *MUST/SHOULD?* always be the first class initilizer being called (except debug)! */
}
--iRefCount;
/* TODO we must deinit this pointer! pObjIF = NULL; / * no longer exists for this caller */
dbgprintf("rsyslog runtime de-initialized, current users %d\n", iRefCount);
RETiRet;
}
/* returns 0 if the rsyslog runtime is not initialized and another value
* if it is. This function is primarily meant to be used by runtime functions
* itself. However, it is safe to call it before initializing the runtime.
* Plugins should NOT rely on this function. The reason is that another caller
* may have already initialized it but deinits it before this plugin is done.
* So for plugins and like architectures, the right course of action is to
* call rsrtInit() and rsrtExit(), which can be called by multiple callers.
* rgerhards, 2008-04-16
*/
int rsrtIsInit(void)
{
return iRefCount;
}
/* vim:set ai:
*/
|
