1 /* log - a generic logging facility in the spirit of log4j */
3 /* Copyright (c) 2004-2014. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
12 #include <stdio.h> /* snprintf */
13 #include <stdlib.h> /* snprintf */
15 #include "portable.h" /* to get a working stdarg.h */
17 #include "xbt_modinter.h"
22 #include "xbt/sysdep.h"
23 #include "xbt/log_private.h"
24 #include "xbt/dynar.h"
25 #include "xbt/xbt_os_thread.h"
27 int xbt_log_no_loc = 0; /* if set to true (with --log=no_loc), file localization will be omitted (for tesh tests) */
28 static xbt_os_rmutex_t log_cat_init_mutex = NULL;
30 /** \addtogroup XBT_log
32 * This section describes the API to the log functions used
33 * everywhere in this project.
35 \section XBT_log_toc Table of contents
45 - \ref log_API_isenabled
48 - \ref log_API_example
51 - \ref log_use_conf_thres
52 - \ref log_use_conf_multi
53 - \ref log_use_conf_fmt
54 - \ref log_use_conf_app
55 - \ref log_use_conf_add
62 \section log_overview 1. Introduction
64 This module is in charge of handling the log messages of every SimGrid
65 program. The main design goal are:
67 - <b>configurability</b>: the user can choose <i>at runtime</i> what messages to show and
68 what to hide, as well as how messages get displayed.
69 - <b>ease of use</b>: both to the programmer (using preprocessor macros black magic)
70 and to the user (with command line options)
71 - <b>performances</b>: logging shouldn't slow down the program when turned off, for example
72 - deal with <b>distributed settings</b>: SimGrid programs are [often] distributed ones,
73 and the logging mechanism allows to syndicate each and every log source into the same place.
74 At least, its design would allow to, once we write the last missing pieces
76 There is three main concepts in SimGrid's logging mechanism: <i>category</i>,
77 <i>priority</i> and <i>appender</i>. These three concepts work together to
78 enable developers to log messages according to message type and priority, and
79 to control at runtime how these messages are formatted and where they are
82 \subsection log_cat 1.1 Category hierarchy
84 The first and foremost advantage of any logging API over plain printf()
85 resides in its ability to disable certain log statements while allowing
86 others to print unhindered. This capability assumes that the logging space,
87 that is, the space of all possible logging statements, is categorized
88 according to some developer-chosen criteria.
90 This observation led to choosing category as the central concept of the
91 system. In a certain sense, they can be considered as logging topics or
94 \subsection log_pri 1.2 Logging priorities
96 The user can naturally declare interest into this or that logging category, but
97 he also can specify the desired level of details for each of them. This is
98 controlled by the <i>priority</i> concept (which should maybe be renamed to
101 Empirically, the user can specify that he wants to see every debugging message
102 of MSG while only being interested into the messages at level "error" or
103 higher about the XBT internals.
105 \subsection log_app 1.3 Message appenders
107 The message appenders are the elements in charge of actually displaying the
108 message to the user. For now, only two appenders exist: the default one prints
109 stuff on stderr while it is possible to create appenders printing to a specific
112 Other are planed (such as the one sending everything to a remote server,
113 or the one using only a fixed amount of lines in a file, and rotating content on
114 need). One day, for sure ;)
116 \subsection log_lay 1.4 Message layouts
118 The message layouts are the elements in charge of choosing how each message
119 will look like. Their result is a string which is then passed to the appender
120 attached to the category to be displayed.
122 For now, there is two layouts: The simple one, which is good for most cases,
123 and another one allowing users to specify the format they want.
124 \ref log_use_conf provides more info on this.
126 \subsection log_hist 1.5 History of this module
128 Historically, this module is an adaptation of the log4c project, which is dead
129 upstream, and which I was given the permission to fork under the LGPL licence
130 by the log4c's authors. The log4c project itself was loosely based on the
131 Apache project's Log4J, which also inspired Log4CC, Log4py and so on. Our work
132 differs somehow from these projects anyway, because the C programming language
133 is not object oriented.
135 \section log_API 2. Programmer interface
137 \subsection log_API_cat 2.1 Constructing the category hierarchy
139 Every category is declared by providing a name and an optional
140 parent. If no parent is explicitly named, the root category, LOG_ROOT_CAT is
141 the category's parent.
143 A category is created by a macro call at the top level of a file. A
144 category can be created with any one of the following macros:
146 - \ref XBT_LOG_NEW_CATEGORY(MyCat,desc); Create a new root
147 - \ref XBT_LOG_NEW_SUBCATEGORY(MyCat, ParentCat,desc);
148 Create a new category being child of the category ParentCat
149 - \ref XBT_LOG_NEW_DEFAULT_CATEGORY(MyCat,desc);
150 Like XBT_LOG_NEW_CATEGORY, but the new category is the default one
152 - \ref XBT_LOG_NEW_DEFAULT_SUBCATEGORY(MyCat, ParentCat,desc);
153 Like XBT_LOG_NEW_SUBCATEGORY, but the new category is the default one
156 The parent cat can be defined in the same file or in another file (in
157 which case you want to use the \ref XBT_LOG_EXTERNAL_CATEGORY macro to make
158 it visible in the current file), but each category may have only one
159 definition. Likewise, you can use a category defined in another file as
160 default one using \ref XBT_LOG_EXTERNAL_DEFAULT_CATEGORY
162 Typically, there will be a Category for each module and sub-module, so you
163 can independently control logging for each module.
165 For a list of all existing categories, please refer to the \ref XBT_log_cats
166 section. This file is generated automatically from the SimGrid source code, so
167 it should be complete and accurate.
169 \section log_API_pri 2.2 Declaring message priority
171 A category may be assigned a threshold priority. The set of priorities are
172 defined by the \ref e_xbt_log_priority_t enum. All logging request under
173 this priority will be discarded.
175 If a given category is not assigned a threshold priority, then it inherits
176 one from its closest ancestor with an assigned threshold. To ensure that all
177 categories can eventually inherit a threshold, the root category always has
178 an assigned threshold priority.
180 Logging requests are made by invoking a logging macro on a category. All of
181 the macros have a printf-style format string followed by arguments. If you
182 compile with the -Wall option, gcc will warn you for unmatched arguments, ie
183 when you pass a pointer to a string where an integer was specified by the
184 format. This is usually a good idea.
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>XBT_CLOG(MyCat, xbt_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 priorities 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>XBT_CWARN(MyCat, "Values are: %d and '%s'", 5, "oops");</code>
204 \section log_API_isenabled 2.3 Checking if a particular category/priority is enabled
206 It is sometimes useful to check whether a particular category is
207 enabled at a particular 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>XBT_WARN("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 #XBT_DEBUG, #XBT_VERB, #XBT_INFO,
231 #XBT_WARN, #XBT_ERROR and #XBT_CRITICAL macros.
233 Under GCC, these macro check there arguments the same way than printf does. So,
234 if you compile with -Wall, the following code will issue a warning:
235 <code>XBT_DEBUG("Found %s (id %d)", some_string, a_double)</code>
237 If you want to specify the category to log onto (for example because you
238 have more than one category per file, add a C before the name of the log
239 producing macro (ie, use #XBT_CDEBUG, #XBT_CVERB, #XBT_CINFO, #XBT_CWARN,
240 #XBT_CERROR and #XBT_CCRITICAL and friends), and pass the category name as
243 The TRACE priority is not used the same way than the other. You should use
244 the #XBT_IN, #XBT_OUT and #XBT_HERE macros instead.
246 \section log_API_example 2.6 Example of use
248 Here is a more complete example:
253 / * create a category and a default subcategory * /
254 XBT_LOG_NEW_CATEGORY(VSS);
255 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(SA, VSS);
258 / * Now set the parent's priority. (the string would typically be a runtime option) * /
259 xbt_log_control_set("SA.thresh:3");
261 / * This request is enabled, because WARNING >= INFO. * /
262 XBT_CWARN(VSS, "Low fuel level.");
264 / * This request is disabled, because DEBUG < INFO. * /
265 XBT_CDEBUG(VSS, "Starting search for nearest gas station.");
267 / * The default category SA inherits its priority from VSS. Thus,
268 the following request is enabled because INFO >= INFO. * /
269 XBT_INFO("Located nearest gas station.");
271 / * This request is disabled, because DEBUG < INFO. * /
272 XBT_DEBUG("Exiting gas station search");
276 \section log_user 3. User interface
278 \section log_use_conf 3.1 Configuration
280 Although rarely done, it is possible to configure the logs during
281 program initialization by invoking the xbt_log_control_set() method
282 manually. A more conventional way is to use the --log command line
283 argument. xbt_init() (called by MSG_init() and friends)
284 checks and deals properly with such arguments.
286 \subsection log_use_conf_thres 3.1.1 Threshold configuration
288 The most common setting is to control which logging event will get
289 displayed by setting a threshold to each category through the
290 <tt>threshold</tt> keyword.
292 For example, \verbatim --log=root.threshold:debug\endverbatim will make
293 SimGrid <b>extremely</b> verbose while \verbatim
294 --log=root.thres:critical\endverbatim should shut it almost
297 Note that the <tt>threshold</tt> keyword can be abbreviated here. For example,
298 all the following notations have the same result.
300 --log=root.threshold:debug
301 --log=root.threshol:debug
302 --log=root.thresho:debug
303 --log=root.thresh:debug
304 --log=root.thres:debug
305 --log=root.thre:debug
309 --log=root.:debug <--- That's obviously really ugly, but it actually works.
312 The full list of recognized thresholds is the following:
314 - trace: enter and return of some functions
315 - debug: crufty output
316 - verbose: verbose output for the user wanting more
317 - info: output about the regular functionning
318 - warning: minor issue encountered
319 - error: issue encountered
320 - critical: major issue encountered
322 \subsection log_use_conf_multi 3.1.2 Passing several settings
324 You can provide several of those arguments to change the setting of several
325 categories, they will be applied from left to right. So,
326 \verbatim --log="root.thres:debug root.thres:critical"\endverbatim should
327 disable almost any logging.
329 Note that the quotes on above line are mandatory because there is a space in
330 the argument, so we are protecting ourselves from the shell, not from SimGrid.
331 We could also reach the same effect with this:
332 \verbatim --log=root.thres:debug --log=root.thres:critical\endverbatim
334 \subsection log_use_conf_fmt 3.1.3 Format configuration
336 As with SimGrid 3.3, it is possible to control the format of log
337 messages. This is done through the <tt>fmt</tt> keyword. For example,
338 \verbatim --log=root.fmt:%m\endverbatim reduces the output to the
339 user-message only, removing any decoration such as the date, or the
340 process ID, everything.
342 Here are the existing format directives:
345 - %%n: platform-dependent line separator (LOG4J compatible)
346 - %%e: plain old space (SimGrid extension)
348 - %%m: user-provided message
350 - %%c: Category name (LOG4J compatible)
351 - %%p: Priority name (LOG4J compatible)
353 - %%h: Hostname (SimGrid extension)
354 - %%P: Process name (SimGrid extension -- note that with SMPI this is the integer value of the process rank)
355 - %%t: Thread "name" (LOG4J compatible -- actually the address of the thread in memory)
356 - %%i: Process PID (SimGrid extension -- this is a 'i' as in 'i'dea)
358 - %%F: file name where the log event was raised (LOG4J compatible)
359 - %%l: location where the log event was raised (LOG4J compatible, like '%%F:%%L' -- this is a l as in 'l'etter)
360 - %%L: line number where the log event was raised (LOG4J compatible)
361 - %%M: function name (LOG4J compatible -- called method name here of course).
362 Defined only when using gcc because there is no __FUNCTION__ elsewhere.
364 - %%b: full backtrace (Called %%throwable in LOG4J).
365 Defined only under windows or when using the GNU libc because backtrace() is not defined
366 elsewhere, and we only have a fallback for windows boxes, not mac ones for example.
367 - %%B: short backtrace (only the first line of the %%b).
368 Called %%throwable{short} in LOG4J; defined where %%b is.
370 - %%d: date (UNIX-like epoch)
371 - %%r: application age (time elapsed since the beginning of the application)
374 If you want to mimic the simple layout with the format one, you would use this
375 format: '[%%h:%%i:(%%i) %%r] %%l: [%%c/%%p] %%m%%n'. This is not completely correct
376 because the simple layout do not display the message location for messages at
377 priority INFO (thus, the fmt is '[%%h:%%i:(%%i) %%r] [%%c/%%p] %%m%%n' in this
378 case). Moreover, if there is no process name (ie, messages coming from the
379 library itself, or test programs doing strange things) do not display the
380 process identity (thus, fmt is '[%%r] %%l: [%%c/%%p] %%m%%n' in that case, and '[%%r]
381 [%%c/%%p] %%m%%n' if they are at priority INFO).
383 For now, there is only two format modifiers: the precision and the
384 width fields. You can for example specify %.4r to get the application
385 age with 4 numbers after the radix, or %15p to get the process name
386 on 15 columns. Finally, you can specify %10.6r to get the time on at
387 most 10 columns, with 6 numbers after the radix.
389 Note that when specifying the width, it is filled with spaces. That
390 is to say that for example %5r in your format is converted to "% 5f"
391 for printf (note the extra space); there is no way to fill the empty
392 columns with 0 (ie, pass "%05f" to printf). Another limitation is
393 that you cannot set specific layouts to the several priorities.
395 \subsection log_use_conf_app 3.1.4 Category appender
397 As with SimGrid 3.3, it is possible to control the appender of log
398 messages. This is done through the <tt>app</tt> keyword. For example,
399 \verbatim --log=root.app:file:mylogfile\endverbatim redirects the output
400 to the file mylogfile.
402 Any appender setup this way have its own layout format (simple one by default),
403 so you may have to change it too afterward. Moreover, the additivity of the log category
404 is also set to false to prevent log event displayed by this appender to "leak" to any other
405 appender higher in the hierarchy. If it is not what you wanted, you can naturally change it
408 \subsection log_use_conf_add 3.1.5 Category additivity
410 The <tt>add</tt> keyword allows to specify the additivity of a
411 category (see \ref log_in_app). '0', '1', 'no', 'yes', 'on'
412 and 'off' are all valid values, with 'yes' as default.
414 The following example resets the additivity of the xbt category to true (which is its default value).
415 \verbatim --log=xbt.add:yes\endverbatim
417 \section log_use_misc 3.2 Misc and Caveats
419 - Do not use any of the macros that start with '_'.
420 - Log4J has a 'rolling file appender' which you can select with a run-time
421 option and specify the max file size. This would be a nice default for
422 non-kernel applications.
423 - Careful, category names are global variables.
425 \section log_internals 4. Internal considerations
427 This module is a mess of macro black magic, and when it goes wrong,
428 SimGrid studently loose its ability to explain its problems. When
429 messing around this module, I often find useful to define
430 XBT_LOG_MAYDAY (which turns it back to good old printf) for the time
431 of finding what's going wrong. But things are quite verbose when
432 everything is enabled...
434 \section log_in_perf 4.1 Performance
436 Except for the first invocation of a given category, a disabled logging request
437 requires an a single comparison of a static variable to a constant.
439 There is also compile time constant, \ref XBT_LOG_STATIC_THRESHOLD, which
440 causes all logging requests with a lower priority to be optimized to 0 cost
441 by the compiler. By setting it to xbt_log_priority_infinite, all logging
442 requests are statically disabled at compile time and cost nothing. Released executables
443 <i>might</i> be compiled with (note that it will prevent users to debug their problems)
444 \verbatim-DXBT_LOG_STATIC_THRESHOLD=xbt_log_priority_infinite\endverbatim
446 Compiling with the \verbatim-DNLOG\endverbatim option disables all logging
447 requests at compilation time while the \verbatim-DNDEBUG\endverbatim disables
448 the requests of priority below INFO.
450 \todo Logging performance *may* be improved further by improving the message
451 propagation from appender to appender in the category tree.
453 \section log_in_app 4.2 Appenders
455 Each category has an optional appender. An appender is a pointer to a
456 structure which starts with a pointer to a do_append() function. do_append()
457 prints a message to a log.
459 When a category is passed a message by one of the logging macros, the
460 category performs the following actions:
462 - if the category has an appender, the message is passed to the
463 appender's do_append() function,
464 - if additivity is true for the category, the message is passed to
465 the category's parent. Additivity is true by default, and can be
466 controlled by xbt_log_additivity_set() or something like --log=root.add:1 (see \ref log_use_conf_add).
467 Also, when you add an appender to a category, its additivity is automatically turned to off.
468 Turn it back on afterward if it is not what you wanted.
470 By default, only the root category have an appender, and any other category has
471 its additivity set to true. This causes all messages to be logged by the root
474 The default appender function currently prints to stderr, and the only other
475 existing one writes to the specified file. More would be needed, like the one
476 able to send the logs to a remote dedicated server.
477 This is on our TODO list for quite a while now, but your help would be
478 welcome here, too. */
480 xbt_log_appender_t xbt_log_default_appender = NULL; /* set in log_init */
481 xbt_log_layout_t xbt_log_default_layout = NULL; /* set in log_init */
486 e_xbt_log_priority_t thresh;
488 xbt_log_appender_t appender;
489 } s_xbt_log_setting_t, *xbt_log_setting_t;
491 static xbt_dynar_t xbt_log_settings = NULL;
493 static void _free_setting(void *s)
495 xbt_log_setting_t set = *(xbt_log_setting_t *) s;
503 static void _xbt_log_cat_apply_set(xbt_log_category_t category,
504 xbt_log_setting_t setting);
506 const char *xbt_log_priority_names[8] = {
517 s_xbt_log_category_t _XBT_LOGV(XBT_LOG_ROOT_CAT) = {
518 NULL /*parent */ , NULL /* firstChild */ , NULL /* nextSibling */ ,
519 "root", "The common ancestor for all categories",
520 0 /*initialized */, xbt_log_priority_uninitialized /* threshold */ ,
521 0 /* isThreshInherited */ ,
522 NULL /* appender */ , NULL /* layout */ ,
526 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(log, xbt,
527 "Loggings from the logging mechanism itself");
529 /* create the default appender and install it in the root category,
530 which were already created (damnit. Too slow little beetle) */
531 void xbt_log_preinit(void)
533 xbt_log_default_appender = xbt_log_appender_file_new(NULL);
534 xbt_log_default_layout = xbt_log_layout_simple_new(NULL);
535 _XBT_LOGV(XBT_LOG_ROOT_CAT).appender = xbt_log_default_appender;
536 _XBT_LOGV(XBT_LOG_ROOT_CAT).layout = xbt_log_default_layout;
537 log_cat_init_mutex = xbt_os_rmutex_init();
540 static void xbt_log_connect_categories(void)
542 /* Connect our log channels: that must be done manually under windows */
543 /* Also permit that they are correctly listed by xbt_log_help_categories() */
546 XBT_LOG_CONNECT(xbt);
547 XBT_LOG_CONNECT(graphxml_parse);
548 XBT_LOG_CONNECT(log);
550 XBT_LOG_CONNECT(mm_diff);
552 XBT_LOG_CONNECT(module);
553 XBT_LOG_CONNECT(peer);
554 XBT_LOG_CONNECT(replay);
555 XBT_LOG_CONNECT(strbuff);
556 XBT_LOG_CONNECT(xbt_cfg);
557 XBT_LOG_CONNECT(xbt_dict);
558 XBT_LOG_CONNECT(xbt_dict_cursor);
559 XBT_LOG_CONNECT(xbt_dict_elm);
560 #ifdef XBT_USE_DEPRECATED
561 XBT_LOG_CONNECT(xbt_dict_multi);
563 XBT_LOG_CONNECT(xbt_dyn);
564 XBT_LOG_CONNECT(xbt_ex);
565 XBT_LOG_CONNECT(xbt_fifo);
566 XBT_LOG_CONNECT(xbt_graph);
567 XBT_LOG_CONNECT(xbt_heap);
568 XBT_LOG_CONNECT(xbt_lib);
569 XBT_LOG_CONNECT(xbt_mallocator);
570 XBT_LOG_CONNECT(xbt_matrix);
571 XBT_LOG_CONNECT(xbt_parmap);
572 XBT_LOG_CONNECT(xbt_queue);
573 XBT_LOG_CONNECT(xbt_set);
574 XBT_LOG_CONNECT(xbt_sync);
575 XBT_LOG_CONNECT(xbt_sync_os);
577 #ifdef simgrid_EXPORTS
578 /* The following categories are only defined in libsimgrid */
582 XBT_LOG_CONNECT(bindings);
583 XBT_LOG_CONNECT(lua);
584 XBT_LOG_CONNECT(lua_comm);
585 XBT_LOG_CONNECT(lua_host);
586 XBT_LOG_CONNECT(lua_platf);
587 XBT_LOG_CONNECT(lua_process);
588 XBT_LOG_CONNECT(lua_state_cloner);
589 XBT_LOG_CONNECT(lua_task);
590 XBT_LOG_CONNECT(lua_utils);
595 XBT_LOG_CONNECT(instr);
596 XBT_LOG_CONNECT(instr_api);
597 XBT_LOG_CONNECT(instr_config);
598 XBT_LOG_CONNECT(instr_msg);
599 XBT_LOG_CONNECT(instr_msg_process);
600 XBT_LOG_CONNECT(instr_msg_vm);
601 XBT_LOG_CONNECT(instr_paje_containers);
602 XBT_LOG_CONNECT(instr_paje_header);
603 XBT_LOG_CONNECT(instr_paje_trace);
604 XBT_LOG_CONNECT(instr_paje_types);
605 XBT_LOG_CONNECT(instr_paje_values);
606 XBT_LOG_CONNECT(instr_resource);
607 XBT_LOG_CONNECT(instr_routing);
608 XBT_LOG_CONNECT(instr_sd);
609 XBT_LOG_CONNECT(instr_surf);
610 XBT_LOG_CONNECT(instr_trace);
611 XBT_LOG_CONNECT(instr_TI_trace);
616 XBT_LOG_CONNECT(jedule);
617 XBT_LOG_CONNECT(jed_out);
618 XBT_LOG_CONNECT(jed_sd);
624 XBT_LOG_CONNECT(mc_checkpoint);
625 XBT_LOG_CONNECT(mc_compare);
626 XBT_LOG_CONNECT(mc_dpor);
627 XBT_LOG_CONNECT(mc_global);
628 XBT_LOG_CONNECT(mc_liveness);
629 XBT_LOG_CONNECT(mc_memory);
630 XBT_LOG_CONNECT(mc_memory_map);
631 XBT_LOG_CONNECT(mc_request);
635 XBT_LOG_CONNECT(msg);
636 XBT_LOG_CONNECT(msg_action);
637 XBT_LOG_CONNECT(msg_gos);
638 XBT_LOG_CONNECT(msg_io);
639 XBT_LOG_CONNECT(msg_kernel);
640 XBT_LOG_CONNECT(msg_mailbox);
641 XBT_LOG_CONNECT(msg_new_API);
642 XBT_LOG_CONNECT(msg_process);
643 XBT_LOG_CONNECT(msg_synchro);
644 XBT_LOG_CONNECT(msg_task);
645 XBT_LOG_CONNECT(msg_vm);
649 XBT_LOG_CONNECT(sd_daxparse);
651 XBT_LOG_CONNECT(sd_dotparse);
653 XBT_LOG_CONNECT(sd_kernel);
654 XBT_LOG_CONNECT(sd_task);
655 XBT_LOG_CONNECT(sd_workstation);
658 XBT_LOG_CONNECT(simix);
659 XBT_LOG_CONNECT(simix_context);
660 XBT_LOG_CONNECT(simix_deployment);
661 XBT_LOG_CONNECT(simix_environment);
662 XBT_LOG_CONNECT(simix_host);
663 XBT_LOG_CONNECT(simix_io);
664 XBT_LOG_CONNECT(simix_kernel);
665 XBT_LOG_CONNECT(simix_network);
666 XBT_LOG_CONNECT(simix_new_api);
667 XBT_LOG_CONNECT(simix_process);
668 XBT_LOG_CONNECT(simix_smurf);
669 XBT_LOG_CONNECT(simix_synchro);
670 XBT_LOG_CONNECT(simix_vm);
673 /* SMPI categories are connected in smpi_global.c */
676 XBT_LOG_CONNECT(surf);
677 XBT_LOG_CONNECT(platf_generator);
678 XBT_LOG_CONNECT(random);
679 XBT_LOG_CONNECT(surf_config);
680 XBT_LOG_CONNECT(surf_cpu);
681 XBT_LOG_CONNECT(surf_cpu_cas);
682 XBT_LOG_CONNECT(surf_cpu_ti);
683 XBT_LOG_CONNECT(surf_energy);
684 XBT_LOG_CONNECT(surf_kernel);
685 XBT_LOG_CONNECT(surf_lagrange);
686 XBT_LOG_CONNECT(surf_lagrange_dichotomy);
687 XBT_LOG_CONNECT(surf_maxmin);
688 XBT_LOG_CONNECT(surf_network);
690 XBT_LOG_CONNECT(surf_network_gtnets);
691 XBT_LOG_CONNECT(surf_network_gtnets_interface);
692 XBT_LOG_CONNECT(surf_network_gtnets_simulator);
693 XBT_LOG_CONNECT(surf_network_gtnets_topology);
696 XBT_LOG_CONNECT(surf_network_ns3);
697 XBT_LOG_CONNECT(interface_ns3);
698 XBT_LOG_CONNECT(simulator_ns3);
700 XBT_LOG_CONNECT(surf_parse);
701 XBT_LOG_CONNECT(surf_route);
702 XBT_LOG_CONNECT(surf_routing_generic);
703 XBT_LOG_CONNECT(surf_route_cluster);
704 XBT_LOG_CONNECT(surf_route_cluster_torus);
705 XBT_LOG_CONNECT(surf_route_dijkstra);
706 XBT_LOG_CONNECT(surf_route_floyd);
707 XBT_LOG_CONNECT(surf_route_full);
708 XBT_LOG_CONNECT(surf_route_none);
709 XBT_LOG_CONNECT(surf_route_vivaldi);
710 XBT_LOG_CONNECT(surf_storage);
711 XBT_LOG_CONNECT(surf_trace);
712 XBT_LOG_CONNECT(surf_vm_workstation);
713 XBT_LOG_CONNECT(surf_workstation);
715 #endif /* simgrid_EXPORTS */
718 static void xbt_log_help(void);
719 static void xbt_log_help_categories(void);
721 /** @brief Get all logging settings from the command line
723 * xbt_log_control_set() is called on each string we got from cmd line
725 void xbt_log_init(int *argc, char **argv)
727 unsigned help_requested = 0; /* 1: logs; 2: categories */
731 // _XBT_LOGV(log).threshold = xbt_log_priority_debug; /* uncomment to set the LOG category to debug directly */
733 xbt_log_connect_categories();
735 /* Set logs and init log submodule */
736 for (j = i = 1; i < *argc; i++) {
737 if (!strncmp(argv[i], "--log=", strlen("--log="))) {
738 opt = strchr(argv[i], '=');
740 xbt_log_control_set(opt);
741 XBT_DEBUG("Did apply '%s' as log setting", opt);
742 } else if (!strcmp(argv[i], "--help-logs")) {
744 } else if (!strcmp(argv[i], "--help-log-categories")) {
755 if (help_requested) {
756 if (help_requested & 1)
758 if (help_requested & 2)
759 xbt_log_help_categories();
764 static void log_cat_exit(xbt_log_category_t cat)
766 xbt_log_category_t child;
769 if (cat->appender->free_)
770 cat->appender->free_(cat->appender);
774 if (cat->layout->free_)
775 cat->layout->free_(cat->layout);
779 for (child = cat->firstChild; child != NULL; child = child->nextSibling)
783 void xbt_log_postexit(void)
785 XBT_VERB("Exiting log");
786 xbt_os_rmutex_destroy(log_cat_init_mutex);
787 xbt_dynar_free(&xbt_log_settings);
788 log_cat_exit(&_XBT_LOGV(XBT_LOG_ROOT_CAT));
791 /* Size of the static string in which we build the log string */
792 #define XBT_LOG_STATIC_BUFFER_SIZE 2048
793 /* Minimum size of the dynamic string in which we build the log string
794 (should be greater than XBT_LOG_STATIC_BUFFER_SIZE) */
795 #define XBT_LOG_DYNAMIC_BUFFER_SIZE 4096
797 void _xbt_log_event_log(xbt_log_event_t ev, const char *fmt, ...)
799 xbt_log_category_t cat = ev->cat;
801 xbt_assert(ev->priority >= 0,
802 "Negative logging priority naturally forbidden");
803 xbt_assert(ev->priority < sizeof(xbt_log_priority_names),
804 "Priority %d is greater than the biggest allowed value",
808 xbt_log_appender_t appender = cat->appender;
811 continue; /* No appender, try next */
813 xbt_assert(cat->layout,
814 "No valid layout for the appender of category %s", cat->name);
816 /* First, try with a static buffer */
817 if (XBT_LOG_STATIC_BUFFER_SIZE) {
818 char buff[XBT_LOG_STATIC_BUFFER_SIZE];
821 ev->buffer_size = sizeof buff;
822 va_start(ev->ap, fmt);
823 done = cat->layout->do_layout(cat->layout, ev, fmt);
826 appender->do_append(appender, buff);
827 continue; /* Ok, that worked: go next */
831 /* The static buffer was too small, use a dynamically expanded one */
832 ev->buffer_size = XBT_LOG_DYNAMIC_BUFFER_SIZE;
833 ev->buffer = xbt_malloc(ev->buffer_size);
836 va_start(ev->ap, fmt);
837 done = cat->layout->do_layout(cat->layout, ev, fmt);
841 ev->buffer_size *= 2;
842 ev->buffer = xbt_realloc(ev->buffer, ev->buffer_size);
844 appender->do_append(appender, ev->buffer);
845 xbt_free(ev->buffer);
847 } while (cat->additivity && (cat = cat->parent, 1));
850 #undef XBT_LOG_DYNAMIC_BUFFER_SIZE
851 #undef XBT_LOG_STATIC_BUFFER_SIZE
855 * The standard logging macros use _XBT_LOG_ISENABLED, which calls
856 * _xbt_log_cat_init(). Thus, if we want to avoid an infinite
857 * recursion, we can not use the standard logging macros in
858 * _xbt_log_cat_init(), and in all functions called from it.
860 * To circumvent the problem, we define the macro_xbt_log_init() as
861 * (0) for the length of the affected functions, and we do not forget
862 * to undefine it at the end!
865 static void _xbt_log_cat_apply_set(xbt_log_category_t category,
866 xbt_log_setting_t setting)
868 #define _xbt_log_cat_init(a, b) (0)
870 if (setting->thresh != xbt_log_priority_uninitialized) {
871 xbt_log_threshold_set(category, setting->thresh);
873 XBT_DEBUG("Apply settings for category '%s': set threshold to %s (=%d)",
874 category->name, xbt_log_priority_names[category->threshold],
875 category->threshold);
879 xbt_log_layout_set(category, xbt_log_layout_format_new(setting->fmt));
881 XBT_DEBUG("Apply settings for category '%s': set format to %s",
882 category->name, setting->fmt);
885 if (setting->additivity != -1) {
886 xbt_log_additivity_set(category, setting->additivity);
888 XBT_DEBUG("Apply settings for category '%s': set additivity to %s",
889 category->name, (setting->additivity ? "on" : "off"));
891 if (setting->appender) {
892 xbt_log_appender_set(category, setting->appender);
893 if (!category->layout)
894 xbt_log_layout_set(category, xbt_log_layout_simple_new(NULL));
895 category->additivity = 0;
896 XBT_DEBUG("Set %p as appender of category '%s'",
897 setting->appender, category->name);
899 #undef _xbt_log_cat_init
903 * This gets called the first time a category is referenced and performs the
905 * Also resets threshold to inherited!
907 int _xbt_log_cat_init(xbt_log_category_t category,
908 e_xbt_log_priority_t priority)
910 #define _xbt_log_cat_init(a, b) (0)
912 if (log_cat_init_mutex != NULL) {
913 xbt_os_rmutex_acquire(log_cat_init_mutex);
916 if (category->initialized) {
917 if (log_cat_init_mutex != NULL) {
918 xbt_os_rmutex_release(log_cat_init_mutex);
920 return priority >= category->threshold;
924 xbt_log_setting_t setting = NULL;
927 XBT_DEBUG("Initializing category '%s' (firstChild=%s, nextSibling=%s)",
929 (category->firstChild ? category->firstChild->name : "none"),
930 (category->nextSibling ? category->nextSibling->name : "none"));
932 if (category == &_XBT_LOGV(XBT_LOG_ROOT_CAT)) {
933 category->threshold = xbt_log_priority_info;
934 category->appender = xbt_log_default_appender;
935 category->layout = xbt_log_default_layout;
938 if (!category->parent)
939 category->parent = &_XBT_LOGV(XBT_LOG_ROOT_CAT);
941 XBT_DEBUG("Set %s (%s) as father of %s ",
942 category->parent->name,
943 (category->parent->initialized ?
944 xbt_log_priority_names[category->parent->threshold] : "uninited"),
946 xbt_log_parent_set(category, category->parent);
948 if (XBT_LOG_ISENABLED(log, xbt_log_priority_debug)) {
949 char *buf, *res = NULL;
950 xbt_log_category_t cpp = category->parent->firstChild;
953 buf = bprintf("%s %s", res, cpp->name);
957 res = xbt_strdup(cpp->name);
959 cpp = cpp->nextSibling;
962 XBT_DEBUG("Children of %s: %s; nextSibling: %s",
963 category->parent->name, res,
964 (category->parent->nextSibling ?
965 category->parent->nextSibling->name : "none"));
972 /* Apply the control */
973 if (xbt_log_settings) {
974 xbt_assert(category, "NULL category");
975 xbt_assert(category->name);
977 xbt_dynar_foreach(xbt_log_settings, cursor, setting) {
978 xbt_assert(setting, "Damnit, NULL cat in the list");
979 xbt_assert(setting->catname, "NULL setting(=%p)->catname",
982 if (!strcmp(setting->catname, category->name)) {
984 _xbt_log_cat_apply_set(category, setting);
985 xbt_dynar_cursor_rm(xbt_log_settings, &cursor);
990 XBT_DEBUG("Category '%s': inherited threshold = %s (=%d)",
991 category->name, xbt_log_priority_names[category->threshold],
992 category->threshold);
995 category->initialized = 1;
996 if (log_cat_init_mutex != NULL) {
997 xbt_os_rmutex_release(log_cat_init_mutex);
999 return priority >= category->threshold;
1001 #undef _xbt_log_cat_init
1004 void xbt_log_parent_set(xbt_log_category_t cat, xbt_log_category_t parent)
1006 xbt_assert(cat, "NULL category to be given a parent");
1007 xbt_assert(parent, "The parent category of %s is NULL", cat->name);
1009 /* if the category is initialized, unlink from current parent */
1010 if (cat->initialized) {
1012 xbt_log_category_t *cpp = &cat->parent->firstChild;
1014 while (*cpp != cat && *cpp != NULL) {
1015 cpp = &(*cpp)->nextSibling;
1018 xbt_assert(*cpp == cat);
1019 *cpp = cat->nextSibling;
1022 cat->parent = parent;
1023 cat->nextSibling = parent->firstChild;
1025 parent->firstChild = cat;
1027 if (!parent->initialized)
1028 _xbt_log_cat_init(parent, xbt_log_priority_uninitialized /* ignored */ );
1030 cat->threshold = parent->threshold;
1032 cat->isThreshInherited = 1;
1035 static void _set_inherited_thresholds(xbt_log_category_t cat)
1038 xbt_log_category_t child = cat->firstChild;
1040 for (; child != NULL; child = child->nextSibling) {
1041 if (child->isThreshInherited) {
1042 if (cat != &_XBT_LOGV(log))
1043 XBT_VERB("Set category threshold of %s to %s (=%d)",
1044 child->name, xbt_log_priority_names[cat->threshold],
1046 child->threshold = cat->threshold;
1047 _set_inherited_thresholds(child);
1054 void xbt_log_threshold_set(xbt_log_category_t cat,
1055 e_xbt_log_priority_t threshold)
1057 cat->threshold = threshold;
1058 cat->isThreshInherited = 0;
1060 _set_inherited_thresholds(cat);
1064 static xbt_log_setting_t _xbt_log_parse_setting(const char *control_string)
1067 xbt_log_setting_t set = xbt_new(s_xbt_log_setting_t, 1);
1068 const char *name, *dot, *eq;
1070 set->catname = NULL;
1071 set->thresh = xbt_log_priority_uninitialized;
1073 set->additivity = -1;
1074 set->appender = NULL;
1076 if (!*control_string)
1078 XBT_DEBUG("Parse log setting '%s'", control_string);
1080 control_string += strspn(control_string, " ");
1081 name = control_string;
1082 control_string += strcspn(control_string, ".= ");
1083 dot = control_string;
1084 control_string += strcspn(control_string, ":= ");
1085 eq = control_string;
1086 control_string += strcspn(control_string, " ");
1088 xbt_assert(*dot == '.' && (*eq == '=' || *eq == ':'),
1089 "Invalid control string '%s'", control_string);
1091 if (!strncmp(dot + 1, "threshold", (size_t) (eq - dot - 1))) {
1093 char *neweq = xbt_strdup(eq + 1);
1094 char *p = neweq - 1;
1096 while (*(++p) != '\0') {
1097 if (*p >= 'a' && *p <= 'z') {
1102 XBT_DEBUG("New priority name = %s", neweq);
1103 for (i = 0; i < xbt_log_priority_infinite; i++) {
1104 if (!strncmp(xbt_log_priority_names[i], neweq, p - eq)) {
1105 XBT_DEBUG("This is priority %d", i);
1110 if(i<XBT_LOG_STATIC_THRESHOLD){
1111 THROWF(arg_error, 0,
1112 "Priority: %s is above allowed priority : %s (for debug and trace levels, recompile SimGrid with -Denable_debug=ON)",
1113 eq + 1, xbt_log_priority_names[XBT_LOG_STATIC_THRESHOLD]);
1114 }else if (i < xbt_log_priority_infinite) {
1115 set->thresh = (e_xbt_log_priority_t) i;
1117 THROWF(arg_error, 0,
1118 "Unknown priority name: %s (must be one of: trace,debug,verbose,info,warning,error,critical)",
1122 } else if (!strncmp(dot + 1, "add", (size_t) (eq - dot - 1)) ||
1123 !strncmp(dot + 1, "additivity", (size_t) (eq - dot - 1))) {
1125 char *neweq = xbt_strdup(eq + 1);
1126 char *p = neweq - 1;
1128 while (*(++p) != '\0') {
1129 if (*p >= 'a' && *p <= 'z') {
1133 if (!strcmp(neweq, "ON") || !strcmp(neweq, "YES")
1134 || !strcmp(neweq, "1")) {
1135 set->additivity = 1;
1137 set->additivity = 0;
1140 } else if (!strncmp(dot + 1, "app", (size_t) (eq - dot - 1)) ||
1141 !strncmp(dot + 1, "appender", (size_t) (eq - dot - 1))) {
1143 char *neweq = xbt_strdup(eq + 1);
1145 if (!strncmp(neweq, "file:", 5)) {
1146 set->appender = xbt_log_appender_file_new(neweq + 5);
1148 THROWF(arg_error, 0, "Unknown appender log type: '%s'", neweq);
1151 } else if (!strncmp(dot + 1, "fmt", (size_t) (eq - dot - 1))) {
1152 set->fmt = xbt_strdup(eq + 1);
1155 snprintf(buff, min(512, eq - dot), "%s", dot + 1);
1156 THROWF(arg_error, 0, "Unknown setting of the log category: '%s'",
1159 set->catname = (char *) xbt_malloc(dot - name + 1);
1161 memcpy(set->catname, name, dot - name);
1162 set->catname[dot - name] = '\0'; /* Just in case */
1163 XBT_DEBUG("This is for cat '%s'", set->catname);
1168 static xbt_log_category_t _xbt_log_cat_searchsub(xbt_log_category_t cat,
1171 xbt_log_category_t child, res;
1173 XBT_DEBUG("Search '%s' into '%s' (firstChild='%s'; nextSibling='%s')", name,
1174 cat->name, (cat->firstChild ? cat->firstChild->name : "none"),
1175 (cat->nextSibling ? cat->nextSibling->name : "none"));
1176 if (!strcmp(cat->name, name))
1179 for (child = cat->firstChild; child != NULL; child = child->nextSibling) {
1180 XBT_DEBUG("Dig into %s", child->name);
1181 res = _xbt_log_cat_searchsub(child, name);
1191 * \param control_string What to parse
1193 * Typically passed a command-line argument. The string has the syntax:
1195 * ( [category] "." [keyword] ":" value (" ")... )...
1197 * where [category] is one the category names (see \ref XBT_log_cats for
1198 * a complete list of the ones defined in the SimGrid library)
1199 * and keyword is one of the following:
1201 * - thres: category's threshold priority. Possible values:
1202 * TRACE,DEBUG,VERBOSE,INFO,WARNING,ERROR,CRITICAL
1203 * - add or additivity: whether the logging actions must be passed to
1204 * the parent category.
1205 * Possible values: 0, 1, no, yes, on, off.
1206 * Default value: yes.
1207 * - fmt: the format to use. See \ref log_use_conf_fmt for more information.
1208 * - app or appender: the appender to use. See \ref log_use_conf_app for more
1212 void xbt_log_control_set(const char *control_string)
1214 xbt_log_setting_t set;
1216 /* To split the string in commands, and the cursors */
1217 xbt_dynar_t set_strings;
1221 if (!control_string)
1223 XBT_DEBUG("Parse log settings '%s'", control_string);
1225 /* Special handling of no_loc request, which asks for any file localization to be omitted (for tesh runs) */
1226 if (!strcmp(control_string, "no_loc")) {
1230 /* some initialization if this is the first time that this get called */
1231 if (xbt_log_settings == NULL)
1232 xbt_log_settings = xbt_dynar_new(sizeof(xbt_log_setting_t),
1235 /* split the string, and remove empty entries */
1236 set_strings = xbt_str_split_quoted(control_string);
1238 if (xbt_dynar_is_empty(set_strings)) { /* vicious user! */
1239 xbt_dynar_free(&set_strings);
1243 /* Parse each entry and either use it right now (if the category was already
1244 created), or store it for further use */
1245 xbt_dynar_foreach(set_strings, cpt, str) {
1246 xbt_log_category_t cat = NULL;
1248 set = _xbt_log_parse_setting(str);
1250 _xbt_log_cat_searchsub(&_XBT_LOGV(XBT_LOG_ROOT_CAT), set->catname);
1253 XBT_DEBUG("Apply directly");
1254 _xbt_log_cat_apply_set(cat, set);
1255 _free_setting((void *) &set);
1258 XBT_DEBUG("Store for further application");
1259 XBT_DEBUG("push %p to the settings", (void *) set);
1260 xbt_dynar_push(xbt_log_settings, &set);
1263 xbt_dynar_free(&set_strings);
1266 void xbt_log_appender_set(xbt_log_category_t cat, xbt_log_appender_t app)
1268 if (cat->appender) {
1269 if (cat->appender->free_)
1270 cat->appender->free_(cat->appender);
1271 free(cat->appender);
1273 cat->appender = app;
1276 void xbt_log_layout_set(xbt_log_category_t cat, xbt_log_layout_t lay)
1278 #define _xbt_log_cat_init(a, b) (0)
1279 if (!cat->appender) {
1281 ("No appender to category %s. Setting the file appender as default",
1283 xbt_log_appender_set(cat, xbt_log_appender_file_new(NULL));
1286 if (cat->layout->free_) {
1287 cat->layout->free_(cat->layout);
1292 xbt_log_additivity_set(cat, 0);
1293 #undef _xbt_log_cat_init
1296 void xbt_log_additivity_set(xbt_log_category_t cat, int additivity)
1298 cat->additivity = additivity;
1301 static void xbt_log_help(void)
1304 "Description of the logging output:\n"
1306 " Threshold configuration: --log=CATEGORY_NAME.thres:PRIORITY_LEVEL\n"
1307 " CATEGORY_NAME: defined in code with function 'XBT_LOG_NEW_CATEGORY'\n"
1308 " PRIORITY_LEVEL: the level to print (trace,debug,verbose,info,warning,error,critical)\n"
1309 " -> trace: enter and return of some functions\n"
1310 " -> debug: crufty output\n"
1311 " -> verbose: verbose output for the user wanting more\n"
1312 " -> info: output about the regular functionning\n"
1313 " -> warning: minor issue encountered\n"
1314 " -> error: issue encountered\n"
1315 " -> critical: major issue encountered\n"
1317 " Format configuration: --log=CATEGORY_NAME.fmt:OPTIONS\n"
1318 " OPTIONS may be:\n"
1319 " -> %%%%: the %% char\n"
1320 " -> %%n: platform-dependent line separator (LOG4J compatible)\n"
1321 " -> %%e: plain old space (SimGrid extension)\n"
1323 " -> %%m: user-provided message\n"
1325 " -> %%c: Category name (LOG4J compatible)\n"
1326 " -> %%p: Priority name (LOG4J compatible)\n"
1328 " -> %%h: Hostname (SimGrid extension)\n"
1329 " -> %%P: Process name (SimGrid extension)\n"
1330 " -> %%t: Thread \"name\" (LOG4J compatible -- actually the address of the thread in memory)\n"
1331 " -> %%i: Process PID (SimGrid extension -- this is a 'i' as in 'i'dea)\n"
1333 " -> %%F: file name where the log event was raised (LOG4J compatible)\n"
1334 " -> %%l: location where the log event was raised (LOG4J compatible, like '%%F:%%L' -- this is a l as in 'l'etter)\n"
1335 " -> %%L: line number where the log event was raised (LOG4J compatible)\n"
1336 " -> %%M: function name (LOG4J compatible -- called method name here of course).\n"
1337 " Defined only when using gcc because there is no __FUNCTION__ elsewhere.\n"
1339 " -> %%b: full backtrace (Called %%throwable in LOG4J). Defined only under windows or when using the GNU libc because\n"
1340 " backtrace() is not defined elsewhere, and we only have a fallback for windows boxes, not mac ones for example.\n"
1341 " -> %%B: short backtrace (only the first line of the %%b). Called %%throwable{short} in LOG4J; defined where %%b is.\n"
1343 " -> %%d: date (UNIX-like epoch)\n"
1344 " -> %%r: application age (time elapsed since the beginning of the application)\n"
1347 " --help-log-categories Display the current hierarchy of log categories.\n"
1348 " --log=no_loc Don't print file names in messages (for tesh tests).\n"
1353 static int xbt_log_cat_cmp(const void *pa, const void *pb)
1355 xbt_log_category_t a = *(xbt_log_category_t *)pa;
1356 xbt_log_category_t b = *(xbt_log_category_t *)pb;
1357 return strcmp(a->name, b->name);
1360 static void xbt_log_help_categories_rec(xbt_log_category_t category,
1367 xbt_log_category_t cat;
1372 if (category->parent) {
1373 this_prefix = bprintf("%s \\_ ", prefix);
1374 child_prefix = bprintf("%s | ", prefix);
1376 this_prefix = xbt_strdup(prefix);
1377 child_prefix = xbt_strdup(prefix);
1380 dynar = xbt_dynar_new(sizeof(xbt_log_category_t), NULL);
1381 for (cat = category ; cat != NULL; cat = cat->nextSibling)
1382 xbt_dynar_push_as(dynar, xbt_log_category_t, cat);
1384 xbt_dynar_sort(dynar, xbt_log_cat_cmp);
1386 for (i = 0; i < xbt_dynar_length(dynar); i++) {
1387 if (i == xbt_dynar_length(dynar) - 1 && category->parent)
1388 *strrchr(child_prefix, '|') = ' ';
1389 cat = xbt_dynar_get_as(dynar, i, xbt_log_category_t);
1390 printf("%s%s: %s\n", this_prefix, cat->name, cat->description);
1391 xbt_log_help_categories_rec(cat->firstChild, child_prefix);
1394 xbt_dynar_free(&dynar);
1395 xbt_free(this_prefix);
1396 xbt_free(child_prefix);
1399 static void xbt_log_help_categories(void)
1401 printf("Current log category hierarchy:\n");
1402 xbt_log_help_categories_rec(&_XBT_LOGV(XBT_LOG_ROOT_CAT), " ");