3 /* log - a generic logging facility in the spirit of log4j */
5 /* Copyright (c) 2003-2007 Martin Quinson. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
13 #include <stdio.h> /* snprintf */
14 #include <stdlib.h> /* snprintf */
16 #include "portable.h" /* to get a working stdarg.h */
18 #include "xbt_modinter.h"
23 #include "xbt/sysdep.h"
24 #include "xbt/log_private.h"
25 #include "xbt/dynar.h"
27 XBT_PUBLIC_DATA(int) (*xbt_pid)();
29 /** \addtogroup XBT_log
31 * This section describes the API to the log functions used
32 * everywhere in this project.
34 \section XBT_log_toc Table of contents
44 - \ref log_API_isenabled
47 - \ref log_API_example
50 - \ref log_use_conf_thres
51 - \ref log_use_conf_multi
52 - \ref log_use_conf_fmt
53 - \ref log_use_conf_add
60 \section log_overview 1. Introduction
62 This module is in charge of handling the log messages of every SimGrid
63 program. The main design goal are:
65 - <b>configurability</b>: the user can choose <i>at runtime</i> what messages to show and
66 what to hide, as well as how messages get displayed.
67 - <b>ease of use</b>: both to the programmer (using preprocessor macros black magic)
68 and to the user (with command line options)
69 - <b>performances</b>: logging shouldn't slow down the program when turned off, for example
70 - deal with <b>distributed settings</b>: SimGrid programs are [often] distributed ones,
71 and the logging mecanism allows to syndicate each and every log source into the same place.
72 At least, its design would allow to, once we write the last missing pieces
74 There is three main concepts in SimGrid's logging mecanism: <i>category</i>,
75 <i>priority</i> and <i>appender</i>. These three concepts work together to
76 enable developers to log messages according to message type and priority, and
77 to control at runtime how these messages are formatted and where they are
80 \subsection log_cat 1.1 Category hierarchy
82 The first and foremost advantage of any logging API over plain printf()
83 resides in its ability to disable certain log statements while allowing
84 others to print unhindered. This capability assumes that the logging space,
85 that is, the space of all possible logging statements, is categorized
86 according to some developer-chosen criteria.
88 This observation led to choosing category as the central concept of the
89 system. In a certain sense, they can be considered as logging topics or
92 \subsection log_pri 1.2 Logging priorities
94 The user can naturally declare interest into this or that logging category, but
95 he also can specify the desired level of details for each of them. This is
96 controled by the <i>priority</i> concept (which should maybe be renamed to
99 Empirically, the user can specify that he wants to see every debuging message
100 of GRAS while only being interested into the messages at level "error" or
101 higher about the XBT internals.
103 \subsection log_app 1.3 Message appenders
105 The message appenders are the elements in charge of actually displaying the
106 message to the user. For now, there is only one appender: the one able to print
107 stuff on stderr. But everything is in place internally to write new ones, such
108 as the one able to send the strings to a central server in charge of
109 syndicating the logs of every distributed daemons on a well known location.
113 \subsection log_lay 1.4 Message layouts
115 The message layouts are the elements in charge of choosing how each message
116 will look like. Their result is a string which is then passed to the appender
117 attached to the category to be displayed.
119 For now, there is two layouts: The simple one, which is good for most cases,
120 and another one allowing users to specify the format they want.
121 \ref log_use_conf provides more info on this.
123 \subsection log_hist 1.5 History of this module
125 Historically, this module is an adaptation of the log4c project, which is dead
126 upstream, and which I was given the permission to fork under the LGPL licence
127 by the log4c's authors. The log4c project itself was loosely based on the
128 Apache project's Log4J, which also inspired Log4CC, Log4py and so on. Our work
129 differs somehow from these projects anyway, because the C programming language
130 is not object oriented.
132 \section log_API 2. Programmer interface
134 \subsection log_API_cat 2.1 Constructing the category hierarchy
136 Every category is declared by providing a name and an optional
137 parent. If no parent is explicitly named, the root category, LOG_ROOT_CAT is
138 the category's parent.
140 A category is created by a macro call at the top level of a file. A
141 category can be created with any one of the following macros:
143 - \ref XBT_LOG_NEW_CATEGORY(MyCat,desc); Create a new root
144 - \ref XBT_LOG_NEW_SUBCATEGORY(MyCat, ParentCat,desc);
145 Create a new category being child of the category ParentCat
146 - \ref XBT_LOG_NEW_DEFAULT_CATEGORY(MyCat,desc);
147 Like XBT_LOG_NEW_CATEGORY, but the new category is the default one
149 - \ref XBT_LOG_NEW_DEFAULT_SUBCATEGORY(MyCat, ParentCat,desc);
150 Like XBT_LOG_NEW_SUBCATEGORY, but the new category is the default one
153 The parent cat can be defined in the same file or in another file (in
154 which case you want to use the \ref XBT_LOG_EXTERNAL_CATEGORY macro to make
155 it visible in the current file), but each category may have only one
158 Typically, there will be a Category for each module and sub-module, so you
159 can independently control logging for each module.
161 For a list of all existing categories, please refer to the \ref XBT_log_cats
162 section. This file is generated automatically from the SimGrid source code, so
163 it should be complete and accurate.
165 \section log_API_pri 2.2 Declaring message priority
167 A category may be assigned a threshold priorty. The set of priorites are
168 defined by the \ref e_xbt_log_priority_t enum. All logging request under
169 this priority will be discarded.
171 If a given category is not assigned a threshold priority, then it inherits
172 one from its closest ancestor with an assigned threshold. To ensure that all
173 categories can eventually inherit a threshold, the root category always has
174 an assigned threshold priority.
176 Logging requests are made by invoking a logging macro on a category. All of
177 the macros have a printf-style format string followed by arguments. If you
178 compile with the -Wall option, gcc will warn you for unmatched arguments, ie
179 when you pass a pointer to a string where an integer was specified by the
180 format. This is usualy a good idea.
182 Because some C compilers do not support vararg macros, there is a version of
183 the macro for any number of arguments from 0 to 6. The macro name ends with
184 the total number of arguments.
186 Here is an example of the most basic type of macro. This is a logging
187 request with priority <i>warning</i>.
189 <code>CLOG5(MyCat, gras_log_priority_warning, "Values are: %d and '%s'", 5,
192 A logging request is said to be enabled if its priority is higher than or
193 equal to the threshold priority of its category. Otherwise, the request is
194 said to be disabled. A category without an assigned priority will inherit
195 one from the hierarchy.
197 It is possible to use any non-negative integer as a priority. If, as in the
198 example, one of the standard priorites is used, then there is a convenience
199 macro that is typically used instead. For example, the above example is
200 equivalent to the shorter:
202 <code>CWARN4(MyCat, "Values are: %d and '%s'", 5, "oops");</code>
204 \section log_API_isenabled 2.3 Checking if a perticular category/priority is enabled
206 It is sometimes useful to check whether a perticular category is
207 enabled at a perticular priority. One example is when you want to do
208 some extra computation to prepare a nice debugging message. There is
209 no use of doing so if the message won't be used afterward because
210 debugging is turned off.
212 Doing so is extremely easy, thanks to the XBT_LOG_ISENABLED(category, priority).
214 \section log_API_subcat 2.4 Using a default category (the easy interface)
216 If \ref XBT_LOG_NEW_DEFAULT_SUBCATEGORY(MyCat, Parent) or
217 \ref XBT_LOG_NEW_DEFAULT_CATEGORY(MyCat) is used to create the
218 category, then the even shorter form can be used:
220 <code>WARN3("Values are: %s and '%d'", 5, "oops");</code>
222 Only one default category can be created per file, though multiple
223 non-defaults can be created and used.
225 \section log_API_easy 2.5 Putting all together: the easy interface
227 First of all, each module should register its own category into the categories
228 tree using \ref XBT_LOG_NEW_DEFAULT_SUBCATEGORY.
230 Then, logging should be done with the DEBUG<n>, VERB<n>, INFO<n>, WARN<n>,
231 ERROR<n> or CRITICAL<n> macro families (such as #DEBUG10, #VERB10,
232 #INFO10, #WARN10, #ERROR10 and #CRITICAL10). For each group, there is at
233 least 11 different macros (like DEBUG0, DEBUG1, DEBUG2, DEBUG3, DEBUG4 and
234 DEBUG5, DEBUG6, DEBUG7, DEBUG8, DEBUG9, DEBUG10), only differing in the number of arguments passed along the format.
235 This is because we want SimGrid itself to keep compilable on ancient
236 compiler not supporting variable number of arguments to macros. But we
237 should provide a macro simpler to use for the users not interested in SP3
240 Under GCC, these macro check there arguments the same way than printf does. So,
241 if you compile with -Wall, the folliwing code will issue a warning:
242 <code>DEBUG2("Found %s (id %f)", some_string, a_double)</code>
244 If you want to specify the category to log onto (for example because you
245 have more than one category per file, add a C before the name of the log
246 producing macro (ie, use #CDEBUG10, #CVERB10, #CINFO10, #CWARN10, #CERROR10 and
247 #CCRITICAL10 and friends), and pass the category name as first argument.
249 The TRACE priority is not used the same way than the other. You should use
250 the #XBT_IN, XBT_IN<n> (up to #XBT_IN5), #XBT_OUT and #XBT_HERE macros
253 \section log_API_example 2.6 Example of use
255 Here is a more complete example:
260 / * create a category and a default subcategory * /
261 XBT_LOG_NEW_CATEGORY(VSS);
262 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(SA, VSS);
265 / * Now set the parent's priority. (the string would typcially be a runtime option) * /
266 xbt_log_control_set("SA.thresh:3");
268 / * This request is enabled, because WARNING >= INFO. * /
269 CWARN2(VSS, "Low fuel level.");
271 / * This request is disabled, because DEBUG < INFO. * /
272 CDEBUG2(VSS, "Starting search for nearest gas station.");
274 / * The default category SA inherits its priority from VSS. Thus,
275 the following request is enabled because INFO >= INFO. * /
276 INFO1("Located nearest gas station.");
278 / * This request is disabled, because DEBUG < INFO. * /
279 DEBUG1("Exiting gas station search");
283 Another example can be found in the relevant part of the GRAS tutorial:
284 \ref GRAS_tut_tour_logs.
286 \section log_user 3. User interface
288 \section log_use_conf 3.1 Configuration
290 Although rarely done, it is possible to configure the logs during
291 program initialization by invoking the xbt_log_control_set() method
292 manually. A more conventionnal way is to use the --log command line
293 argument. xbt_init() (called by MSG_init(), gras_init() and friends)
294 checks and deals properly with such arguments.
296 The following command line arguments exist, but are deprecated and
297 may disapear in the future: --xbt-log, --gras-log, --msg-log and
300 \subsection log_use_conf_thres 3.1.1 Thresold configuration
302 The most common setting is to control which logging event will get
303 displayed by setting a threshold to each category through the
304 <tt>thres</tt> keyword.
306 For example, \verbatim --log=root.thres:debug\endverbatim will make
307 SimGrid <b>extremely</b> verbose while \verbatim
308 --log=root.thres:critical\endverbatim should shut it almost
311 \subsection log_use_conf_multi 3.1.2 Passing several settings
313 You can provide several of those arguments to change the setting of several
314 categories, they will be applied from left to right. So,
315 \verbatim --log="root.thres:debug root.thres:critical"\endverbatim should
316 disable almost any logging.
318 Note that the quotes on above line are mandatory because there is a space in
319 the argument, so we are protecting ourselves from the shell, not from SimGrid.
320 We could also reach the same effect with this:
321 \verbatim --log=root.thres:debug --log=root.thres:critical\endverbatim
323 \subsection log_use_conf_fmt 3.1.3 Format configuration
325 As with SimGrid 3.3, it is possible to control the format of log
326 messages. This is done through the <tt>fmt</tt> keyword. For example,
327 \verbatim --log=root.fmt:%m\endverbatim reduces the output to the
328 user-message only, removing any decoration such as the date, or the
329 process ID, everything.
331 Here are the existing format directives:
334 - %%n: platform-dependant line separator (LOG4J compliant)
335 - %%e: plain old space (SimGrid extension)
337 - %%m: user-provided message
339 - %%c: Category name (LOG4J compliant)
340 - %%p: Priority name (LOG4J compliant)
342 - %%h: Hostname (SimGrid extension)
343 - %%P: Process name (SimGrid extension)
344 - %%t: Thread "name" (LOG4J compliant -- actually the address of the thread in memory)
345 - %%i: Process PID (SimGrid extension -- this is a 'i' as in 'i'dea)
347 - %%F: file name where the log event was raised (LOG4J compliant)
348 - %%l: location where the log event was raised (LOG4J compliant, like '%%F:%%L' -- this is a l as in 'l'etter)
349 - %%L: line number where the log event was raised (LOG4J compliant)
350 - %%M: function name (LOG4J compliant -- called method name here of course).
351 Defined only when using gcc because there is no __FUNCTION__ elsewhere.
353 - %%b: full backtrace (Called %%throwable in LOG4J).
354 Defined only when using the GNU libc because backtrace() is not defined
356 - %%B: short backtrace (only the first line of the %%b).
357 Called %%throwable{short} in LOG4J; defined where %%b is.
359 - %%d: date (UNIX-like epoch)
360 - %%r: application age (time elapsed since the beginning of the application)
363 If you want to mimick the simple layout with the format one, you would use this
364 format: '[%%h:%%i:(%%I) %%r] %%l: [%%c/%%p] %%m%%n'. This is not completely correct
365 because the simple layout do not display the message location for messages at
366 priority INFO (thus, the fmt is '[%%h:%%i:(%%I) %%r] %%l: [%%c/%%p] %%m%%n' in this
367 case). Moreover, if there is no process name (ie, messages comming from the
368 library itself, or test programs doing strange things) do not display the
369 process identity (thus, fmt is '[%%r] %%l: [%%c/%%p] %%m%%n' in that case, and '[%%r]
370 [%%c/%%p] %%m%%n' if they are at priority INFO).
372 For now, there is only one format modifyier: the precision field. You
373 can for example specify %.4r to get the application age with 4
374 numbers after the radix. Another limitation is that you cannot set
375 specific layouts to the several priorities.
377 \subsection log_use_conf_add 3.1.4 Category additivity
379 The <tt>add</tt> keyword allows to specify the additivity of a
380 category (see \ref log_in_app). This is rarely useful since you
381 cannot specify an alternative appender. Anyway, '0', '1', 'no',
382 'yes', 'on' and 'off' are all valid values, with 'yes' as default.
384 \section log_use_misc 3.2 Misc and Caveats
386 - Do not use any of the macros that start with '_'.
387 - Log4J has a 'rolling file appender' which you can select with a run-time
388 option and specify the max file size. This would be a nice default for
389 non-kernel applications.
390 - Careful, category names are global variables.
392 \section log_internals 4. Internal considerations
394 This module is a mess of macro black magic, and when it goes wrong,
395 SimGrid studently loose its ability to explain its problems. When
396 messing around this module, I often find useful to define
397 XBT_LOG_MAYDAY (which turns it back to good old printf) for the time
398 of finding what's going wrong. But things are quite verbose when
399 everything is enabled...
401 \section log_in_perf 4.1 Performance
403 Except for the first invocation of a given category, a disabled logging request
404 requires an a single comparison of a static variable to a constant.
406 There is also compile time constant, \ref XBT_LOG_STATIC_THRESHOLD, which
407 causes all logging requests with a lower priority to be optimized to 0 cost
408 by the compiler. By setting it to gras_log_priority_infinite, all logging
409 requests are statically disabled and cost nothing. Released executables
410 <i>might</i> be compiled with (note that it will prevent users to debug their problems)
411 \verbatim-DXBT_LOG_STATIC_THRESHOLD=gras_log_priority_infinite\endverbatim
413 Compiling with the \verbatim-DNLOG\endverbatim option disables all logging
414 requests at compilation time while the \verbatim-DNDEBUG\endverbatim disables
415 the requests of priority below INFO.
417 \todo Logging performance *may* be improved further by improving the message
418 propagation from appender to appender in the category tree.
420 \section log_in_app 4.2 Appenders
422 Each category has an optional appender. An appender is a pointer to a
423 structure which starts with a pointer to a doAppend() function. DoAppend()
424 prints a message to a log.
426 When a category is passed a message by one of the logging macros, the
427 category performs the following actions:
429 - if the category has an appender, the message is passed to the
430 appender's doAppend() function,
431 - if additivity is true for the category (which is the case by
432 default, and can be controlled by xbt_log_additivity_set()), the
433 message is passed to the category's parent.
435 By default, only the root category have an appender, and any other category has
436 its additivity set to true. This causes all messages to be logged by the root
439 The default appender function currently prints to stderr, and no other one
440 exist, even if more would be needed, like the one able to send the logs to a
441 remote dedicated server, or other ones offering different output formats.
442 This is on our TODO list for quite a while now, but your help would be
449 xbt_log_appender_t xbt_log_default_appender = NULL; /* set in log_init */
450 xbt_log_layout_t xbt_log_default_layout = NULL; /* set in log_init */
455 e_xbt_log_priority_t thresh;
458 } s_xbt_log_setting_t,*xbt_log_setting_t;
460 static xbt_dynar_t xbt_log_settings=NULL;
462 static void _free_setting(void *s) {
463 xbt_log_setting_t set=*(xbt_log_setting_t*)s;
471 static void _xbt_log_cat_apply_set(xbt_log_category_t category,
472 xbt_log_setting_t setting);
474 const char *xbt_log_priority_names[8] = {
485 s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT) = {
486 NULL /*parent*/, NULL /* firstChild */, NULL /* nextSibling */,
487 "root", xbt_log_priority_uninitialized /* threshold */,
488 0 /* isThreshInherited */,
489 NULL /* appender */, NULL /* layout */,
493 XBT_LOG_NEW_CATEGORY(xbt,"All XBT categories (simgrid toolbox)");
494 XBT_LOG_NEW_CATEGORY(surf,"All SURF categories");
495 XBT_LOG_NEW_CATEGORY(msg,"All MSG categories");
496 XBT_LOG_NEW_CATEGORY(simix,"All SIMIX categories");
498 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(log,xbt,"Loggings from the logging mechanism itself");
500 /** @brief Get all logging settings from the command line
502 * xbt_log_control_set() is called on each string we got from cmd line
504 void xbt_log_init(int *argc,char **argv) {
508 /* create the default appender and install it in the root category,
509 which were already created (damnit. Too slow little beetle)*/
510 xbt_log_default_appender = xbt_log_appender_file_new(NULL);
511 xbt_log_default_layout = xbt_log_layout_simple_new(NULL);
512 _XBT_LOGV(XBT_LOG_ROOT_CAT).appender = xbt_log_default_appender;
513 _XBT_LOGV(XBT_LOG_ROOT_CAT).layout = xbt_log_default_layout;
516 // _XBT_LOGV(log).threshold = xbt_log_priority_debug; /* uncomment to set the LOG category to debug directly */
518 /* Set logs and init log submodule */
519 for (i=1; i<*argc; i++){
520 if (!strncmp(argv[i],"--log=",strlen("--log=")) ||
521 !strncmp(argv[i],"--gras-log=",strlen("--gras-log=")) ||
522 !strncmp(argv[i],"--surf-log=",strlen("--surf-log=")) ||
523 !strncmp(argv[i],"--msg-log=",strlen("--msg-log=")) ||
524 !strncmp(argv[i],"--simix-log=",strlen("--simix-log=")) ||
525 !strncmp(argv[i],"--xbt-log=",strlen("--xbt-log="))){
527 if (strncmp(argv[i],"--log=",strlen("--log=")))
528 WARN2("Option %.*s is deprecated and will disapear in the future. Use --log instead.",
529 (int)(strchr(argv[i],'=')-argv[i]),argv[i]);
531 opt=strchr(argv[i],'=');
533 xbt_log_control_set(opt);
534 DEBUG1("Did apply '%s' as log setting",opt);
535 /*remove this from argv*/
537 for (j=i+1; j<*argc; j++){
543 i--; /* compensate effect of next loop incrementation */
548 static void log_cat_exit(xbt_log_category_t cat) {
549 xbt_log_category_t child;
552 if (cat->appender->free_)
553 cat->appender->free_(cat->appender);
557 if (cat->layout->free_)
558 cat->layout->free_(cat->layout);
562 for(child=cat->firstChild ; child != NULL; child = child->nextSibling)
566 void xbt_log_exit(void) {
567 VERB0("Exiting log");
568 xbt_dynar_free(&xbt_log_settings);
569 log_cat_exit(&_XBT_LOGV(XBT_LOG_ROOT_CAT));
573 void _xbt_log_event_log( xbt_log_event_t ev, const char *fmt, ...) {
575 xbt_log_category_t cat = ev->cat;
577 /* Make sure that the layouts have been malloced */
578 xbt_log_default_appender = xbt_log_appender_file_new(NULL);
579 xbt_log_default_layout = xbt_log_layout_simple_new(NULL);
580 _XBT_LOGV(XBT_LOG_ROOT_CAT).appender = xbt_log_default_appender;
581 _XBT_LOGV(XBT_LOG_ROOT_CAT).layout = xbt_log_default_layout;
585 va_start(ev->ap, fmt);
586 va_start(ev->ap_copy, fmt);
588 xbt_log_appender_t appender = cat->appender;
589 if (appender != NULL) {
590 xbt_assert1(cat->layout,"No valid layout for the appender of category %s",cat->name);
591 cat->layout->do_layout(cat->layout, ev, fmt, appender);
593 if (!cat->additivity)
602 static void _xbt_log_cat_apply_set(xbt_log_category_t category,
603 xbt_log_setting_t setting) {
605 s_xbt_log_event_t _log_ev;
607 if (setting->thresh != xbt_log_priority_uninitialized) {
608 xbt_log_threshold_set(category, setting->thresh);
610 if (category->threshold <= xbt_log_priority_debug) {
611 _log_ev.cat = category;
612 _log_ev.priority = xbt_log_priority_debug;
613 _log_ev.fileName = __FILE__ ;
614 _log_ev.functionName = _XBT_FUNCTION ;
615 _log_ev.lineNum = __LINE__ ;
617 _xbt_log_event_log(&_log_ev,
618 "Apply settings for category '%s': set threshold to %s (=%d)",
620 xbt_log_priority_names[category->threshold],
621 category->threshold);
626 xbt_log_layout_set(category,xbt_log_layout_format_new(setting->fmt));
628 if (category->threshold <= xbt_log_priority_debug) {
629 _log_ev.cat = category;
630 _log_ev.priority = xbt_log_priority_debug;
631 _log_ev.fileName = __FILE__ ;
632 _log_ev.functionName = _XBT_FUNCTION ;
633 _log_ev.lineNum = __LINE__ ;
635 _xbt_log_event_log(&_log_ev,
636 "Apply settings for category '%s': set format to %s",
642 if (setting->additivity != -1) {
643 xbt_log_additivity_set(category,setting->additivity);
645 if (category->threshold <= xbt_log_priority_debug) {
646 _log_ev.cat = category;
647 _log_ev.priority = xbt_log_priority_debug;
648 _log_ev.fileName = __FILE__ ;
649 _log_ev.functionName = _XBT_FUNCTION ;
650 _log_ev.lineNum = __LINE__ ;
652 _xbt_log_event_log(&_log_ev,
653 "Apply settings for category '%s': set additivity to %s",
655 (setting->additivity?"on":"off"));
660 * This gets called the first time a category is referenced and performs the
662 * Also resets threshold to inherited!
664 int _xbt_log_cat_init(xbt_log_category_t category,
665 e_xbt_log_priority_t priority) {
667 xbt_log_setting_t setting=NULL;
669 s_xbt_log_event_t _log_ev;
671 if (_XBT_LOGV(log).threshold <= xbt_log_priority_debug
672 && _XBT_LOGV(log).threshold != xbt_log_priority_uninitialized) {
673 _log_ev.cat = &_XBT_LOGV(log);
674 _log_ev.priority = xbt_log_priority_debug;
675 _log_ev.fileName = __FILE__ ;
676 _log_ev.functionName = _XBT_FUNCTION ;
677 _log_ev.lineNum = __LINE__ ;
678 _xbt_log_event_log(&_log_ev, "Initializing category '%s' (firstChild=%s, nextSibling=%s)",
680 (category->firstChild ?category->firstChild->name :"none"),
681 (category->nextSibling?category->nextSibling->name:"none"));
684 if(category == &_XBT_LOGV(XBT_LOG_ROOT_CAT)){
685 category->threshold = xbt_log_priority_info;/* xbt_log_priority_debug*/;
686 category->appender = xbt_log_default_appender;
687 category->layout = xbt_log_default_layout;
690 if (!category->parent)
691 category->parent = &_XBT_LOGV(XBT_LOG_ROOT_CAT);
693 if (_XBT_LOGV(log).threshold <= xbt_log_priority_debug
694 && _XBT_LOGV(log).threshold != xbt_log_priority_uninitialized) {
695 _log_ev.lineNum = __LINE__ ;
696 _xbt_log_event_log(&_log_ev, "Set %s (%s) as father of %s ", category->parent->name,
697 (category->parent->threshold == xbt_log_priority_uninitialized ? "uninited":xbt_log_priority_names[category->parent->threshold]),
700 xbt_log_parent_set(category, category->parent);
702 if (_XBT_LOGV(log).threshold < xbt_log_priority_info
703 && _XBT_LOGV(log).threshold != xbt_log_priority_uninitialized) {
705 xbt_log_category_t cpp = category->parent->firstChild;
708 buf = bprintf("%s %s",res,cpp->name);
712 res = xbt_strdup(cpp->name);
714 cpp = cpp->nextSibling;
717 _log_ev.lineNum = __LINE__ ;
718 _xbt_log_event_log(&_log_ev,
719 "Childs of %s: %s; nextSibling: %s", category->parent->name,res,
720 (category->parent->nextSibling?category->parent->nextSibling->name:"none"));
727 /* Apply the control */
728 if (!xbt_log_settings)
729 return priority >= category->threshold;
731 xbt_assert0(category,"NULL category");
732 xbt_assert(category->name);
734 xbt_dynar_foreach(xbt_log_settings,cursor,setting) {
735 xbt_assert0(setting,"Damnit, NULL cat in the list");
736 xbt_assert1(setting->catname,"NULL setting(=%p)->catname",(void*)setting);
738 if (!strcmp(setting->catname,category->name)) {
742 _xbt_log_cat_apply_set(category,setting);
744 xbt_dynar_cursor_rm(xbt_log_settings,&cursor);
748 if (!found && category->threshold <= xbt_log_priority_verbose) {
750 _log_ev.cat = &_XBT_LOGV(log);
751 _log_ev.priority = xbt_log_priority_verbose;
752 _log_ev.fileName = __FILE__ ;
753 _log_ev.functionName = _XBT_FUNCTION ;
754 _log_ev.lineNum = __LINE__ ;
756 _xbt_log_event_log(&_log_ev,
757 "Category '%s': inherited threshold = %s (=%d)",
759 xbt_log_priority_names[category->threshold], category->threshold);
762 return priority >= category->threshold;
765 void xbt_log_parent_set(xbt_log_category_t cat,xbt_log_category_t parent) {
767 xbt_assert0(cat,"NULL category to be given a parent");
768 xbt_assert1(parent,"The parent category of %s is NULL",cat->name);
771 * if the threshold is initialized
772 * unlink from current parent
774 if(cat->threshold != xbt_log_priority_uninitialized){
776 xbt_log_category_t* cpp = &parent->firstChild;
778 while(*cpp != cat && *cpp != NULL) {
779 cpp = &(*cpp)->nextSibling;
782 xbt_assert(*cpp == cat);
783 *cpp = cat->nextSibling;
786 cat->parent = parent;
787 cat->nextSibling = parent->firstChild;
789 parent->firstChild = cat;
791 if (parent->threshold == xbt_log_priority_uninitialized){
793 _xbt_log_cat_init(parent,
794 xbt_log_priority_uninitialized/* ignored*/);
797 cat->threshold = parent->threshold;
799 cat->isThreshInherited = 1;
803 static void _set_inherited_thresholds(xbt_log_category_t cat) {
805 xbt_log_category_t child = cat->firstChild;
807 for( ; child != NULL; child = child->nextSibling) {
808 if (child->isThreshInherited) {
809 if (cat != &_XBT_LOGV(log))
810 VERB3("Set category threshold of %s to %s (=%d)",
811 child->name,xbt_log_priority_names[cat->threshold],cat->threshold);
812 child->threshold = cat->threshold;
813 _set_inherited_thresholds(child);
820 void xbt_log_threshold_set(xbt_log_category_t cat,
821 e_xbt_log_priority_t threshold) {
822 cat->threshold = threshold;
823 cat->isThreshInherited = 0;
825 _set_inherited_thresholds(cat);
829 static xbt_log_setting_t _xbt_log_parse_setting(const char* control_string) {
831 xbt_log_setting_t set = xbt_new(s_xbt_log_setting_t,1);
832 const char *name, *dot, *eq;
835 set->thresh = xbt_log_priority_uninitialized;
837 set->additivity = -1;
839 if (!*control_string)
841 DEBUG1("Parse log setting '%s'",control_string);
843 control_string += strspn(control_string, " ");
844 name = control_string;
845 control_string += strcspn(control_string, ".= ");
846 dot = control_string;
847 control_string += strcspn(control_string, ":= ");
849 control_string += strcspn(control_string, " ");
851 xbt_assert1(*dot == '.' && (*eq == '=' || *eq == ':'),
852 "Invalid control string '%s'",control_string);
854 if (!strncmp(dot + 1, "thresh", (size_t)(eq - dot - 1))) {
856 char *neweq=xbt_strdup(eq+1);
859 while (*(++p) != '\0') {
860 if (*p >= 'a' && *p <= 'z') {
865 DEBUG1("New priority name = %s",neweq);
866 for (i=0; i<xbt_log_priority_infinite; i++) {
867 if (!strncmp(xbt_log_priority_names[i],neweq,p-eq)) {
868 DEBUG1("This is priority %d",i);
872 if (i<xbt_log_priority_infinite) {
873 set->thresh= (e_xbt_log_priority_t) i;
876 "Unknown priority name: %s (must be one of: trace,debug,verbose,info,warning,error,critical)",eq+1);
879 } else if ( !strncmp(dot + 1, "add", (size_t)(eq - dot - 1)) ||
880 !strncmp(dot + 1, "additivity", (size_t)(eq - dot - 1)) ) {
882 char *neweq=xbt_strdup(eq+1);
885 while (*(++p) != '\0') {
886 if (*p >= 'a' && *p <= 'z') {
890 if ( !strcmp(neweq,"ON") ||
891 !strcmp(neweq,"YES") ||
892 !strcmp(neweq,"1") ) {
898 } else if (!strncmp(dot + 1, "fmt", (size_t)(eq - dot - 1))) {
899 set->fmt = xbt_strdup(eq+1);
902 snprintf(buff,min(512,eq - dot),"%s",dot+1);
903 THROW1(arg_error,0,"Unknown setting of the log category: '%s'",buff);
905 set->catname=(char*)xbt_malloc(dot - name+1);
907 memcpy(set->catname,name,dot-name);
908 set->catname[dot-name]='\0'; /* Just in case */
909 DEBUG1("This is for cat '%s'", set->catname);
914 static xbt_log_category_t _xbt_log_cat_searchsub(xbt_log_category_t cat,char *name) {
915 xbt_log_category_t child,res;
917 DEBUG4("Search '%s' into '%s' (firstChild='%s'; nextSibling='%s')",name,cat->name,
918 (cat->firstChild ? cat->firstChild->name :"none"),
919 (cat->nextSibling ? cat->nextSibling->name:"none"));
920 if (!strcmp(cat->name,name))
923 for (child=cat->firstChild ; child != NULL; child = child->nextSibling) {
924 DEBUG1("Dig into %s",child->name);
925 res = _xbt_log_cat_searchsub(child,name);
935 * \param control_string What to parse
937 * Typically passed a command-line argument. The string has the syntax:
939 * ( [category] "." [keyword] ":" value (" ")... )...
941 * where [category] is one the category names (see \ref XBT_log_cats for
942 * a complete list of the ones defined in the SimGrid library)
943 * and keyword is one of the following:
945 * - thres: category's threshold priority. Possible values:
946 * TRACE,DEBUG,VERBOSE,INFO,WARNING,ERROR,CRITICAL
947 * - add or additivity: whether the logging actions must be passed to
948 * the parent category.
949 * Possible values: 0, 1, no, yes, on, off.
950 * Default value: yes.
951 * - fmt: the format to use. See \ref log_lay for more information.
954 void xbt_log_control_set(const char* control_string) {
955 xbt_log_setting_t set;
957 /* To split the string in commands, and the cursors */
958 xbt_dynar_t set_strings;
964 DEBUG1("Parse log settings '%s'",control_string);
966 /* some initialization if this is the first time that this get called */
967 if (xbt_log_settings == NULL)
968 xbt_log_settings = xbt_dynar_new(sizeof(xbt_log_setting_t),
971 /* split the string, and remove empty entries */
972 set_strings=xbt_str_split_quoted(control_string);
974 if (xbt_dynar_length(set_strings) == 0) { /* vicious user! */
975 xbt_dynar_free(&set_strings);
979 /* Parse each entry and either use it right now (if the category was already
980 created), or store it for further use */
981 xbt_dynar_foreach(set_strings,cpt,str) {
982 xbt_log_category_t cat=NULL;
984 set = _xbt_log_parse_setting(str);
985 cat = _xbt_log_cat_searchsub(&_XBT_LOGV(XBT_LOG_ROOT_CAT),set->catname);
988 DEBUG0("Apply directly");
989 _xbt_log_cat_apply_set(cat,set);
990 _free_setting((void*)&set);
993 DEBUG0("Store for further application");
994 DEBUG1("push %p to the settings",(void*)set);
995 xbt_dynar_push(xbt_log_settings,&set);
998 xbt_dynar_free(&set_strings);
1001 void xbt_log_appender_set(xbt_log_category_t cat, xbt_log_appender_t app) {
1002 if (cat->appender) {
1003 if (cat->appender->free_)
1004 cat->appender->free_(cat->appender);
1005 free(cat->appender);
1007 cat->appender = app;
1009 void xbt_log_layout_set(xbt_log_category_t cat, xbt_log_layout_t lay) {
1010 if (!cat->appender) {
1011 VERB1("No appender to category %s. Setting the file appender as default",
1013 xbt_log_appender_set(cat,xbt_log_appender_file_new(NULL));
1015 if (cat->layout && cat != &_XBT_LOGV(root)) {
1016 /* better leak the default layout than check every categories to
1018 if (cat->layout->free_) {
1019 cat->layout->free_(cat->layout);
1024 xbt_log_additivity_set(cat,0);
1027 void xbt_log_additivity_set(xbt_log_category_t cat, int additivity) {
1028 cat->additivity = additivity;