1 /*****************************************************************************
2 * messages.c: messages interface
3 * This library provides an interface to the message queue to be used by other
4 * modules, especially intf modules. See config.h for output configuration.
5 *****************************************************************************
6 * Copyright (C) 1998-2002 VideoLAN
7 * $Id: messages.c,v 1.26 2002/12/18 11:47:35 sam Exp $
9 * Authors: Vincent Seguin <seguin@via.ecp.fr>
10 * Samuel Hocevar <sam@zoy.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
30 #include <stdio.h> /* required */
31 #include <stdarg.h> /* va_list for BSD */
32 #include <stdlib.h> /* malloc() */
33 #include <string.h> /* strerror() */
38 # include <fcntl.h> /* O_CREAT, O_TRUNC, O_WRONLY, O_SYNC */
42 # include <errno.h> /* errno */
46 #include <unistd.h> /* close(), write() */
49 #include "interface.h"
51 /*****************************************************************************
53 *****************************************************************************/
54 static void QueueMsg ( vlc_object_t *, int , const char *,
55 const char *, va_list );
56 static void FlushMsg ( msg_bank_t * );
57 static void PrintMsg ( vlc_object_t *, msg_item_t * );
59 /*****************************************************************************
60 * msg_Create: initialize messages interface
61 *****************************************************************************
62 * This functions has to be called before any call to other msg_* functions.
63 * It set up the locks and the message queue if it is used.
64 *****************************************************************************/
65 void __msg_Create( vlc_object_t *p_this )
67 /* Message queue initialization */
68 vlc_mutex_init( p_this, &p_this->p_libvlc->msg_bank.lock );
70 p_this->p_libvlc->msg_bank.b_configured = VLC_FALSE;
71 p_this->p_libvlc->msg_bank.b_overflow = VLC_FALSE;
73 p_this->p_libvlc->msg_bank.i_start = 0;
74 p_this->p_libvlc->msg_bank.i_stop = 0;
76 p_this->p_libvlc->msg_bank.i_sub = 0;
77 p_this->p_libvlc->msg_bank.pp_sub = NULL;
80 p_this->p_libvlc->msg_bank.logfile =
81 CreateFile( L"vlc-log.txt", GENERIC_WRITE,
82 FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
83 CREATE_ALWAYS, 0, NULL );
84 SetFilePointer( p_this->p_libvlc->msg_bank.logfile, 0, NULL, FILE_END );
88 /*****************************************************************************
89 * msg_Flush: flush the message queue
90 *****************************************************************************/
91 void __msg_Flush( vlc_object_t *p_this )
95 vlc_mutex_lock( &p_this->p_libvlc->msg_bank.lock );
97 p_this->p_libvlc->msg_bank.b_configured = VLC_TRUE;
99 for( i_index = p_this->p_libvlc->msg_bank.i_start;
100 i_index != p_this->p_libvlc->msg_bank.i_stop;
101 i_index = (i_index+1) % VLC_MSG_QSIZE )
103 PrintMsg( p_this, &p_this->p_libvlc->msg_bank.msg[i_index] );
106 FlushMsg( &p_this->p_libvlc->msg_bank );
108 vlc_mutex_unlock( &p_this->p_libvlc->msg_bank.lock );
111 /*****************************************************************************
112 * msg_Destroy: free resources allocated by msg_Create
113 *****************************************************************************
114 * This functions prints all messages remaining in queue, then free all the
115 * resources allocated by msg_Create.
116 * No other messages interface functions should be called after this one.
117 *****************************************************************************/
118 void __msg_Destroy( vlc_object_t *p_this )
120 if( p_this->p_libvlc->msg_bank.i_sub )
122 msg_Err( p_this, "stale interface subscribers" );
125 /* Flush the queue */
126 if( !p_this->p_libvlc->msg_bank.b_configured )
132 FlushMsg( &p_this->p_libvlc->msg_bank );
136 CloseHandle( p_this->p_libvlc->msg_bank.logfile );
140 vlc_mutex_destroy( &p_this->p_libvlc->msg_bank.lock );
143 /*****************************************************************************
144 * msg_Subscribe: subscribe to the message queue.
145 *****************************************************************************/
146 msg_subscription_t *__msg_Subscribe( vlc_object_t *p_this )
148 msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
149 msg_subscription_t *p_sub = malloc( sizeof( msg_subscription_t ) );
151 vlc_mutex_lock( &p_bank->lock );
153 /* Add subscription to the list */
154 INSERT_ELEM( p_bank->pp_sub, p_bank->i_sub, p_bank->i_sub, p_sub );
156 p_sub->i_start = p_bank->i_start;
157 p_sub->pi_stop = &p_bank->i_stop;
159 p_sub->p_msg = p_bank->msg;
160 p_sub->p_lock = &p_bank->lock;
162 vlc_mutex_unlock( &p_bank->lock );
167 /*****************************************************************************
168 * msg_Unsubscribe: unsubscribe from the message queue.
169 *****************************************************************************/
170 void __msg_Unsubscribe( vlc_object_t *p_this, msg_subscription_t *p_sub )
172 msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
175 vlc_mutex_lock( &p_bank->lock );
180 msg_Err( p_this, "no subscriber in the list" );
184 /* Look for the appropriate subscription */
185 for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
187 if( p_bank->pp_sub[ i_index ] == p_sub )
193 if( p_bank->pp_sub[ i_index ] != p_sub )
195 msg_Err( p_this, "subscriber not found" );
196 vlc_mutex_unlock( &p_bank->lock );
200 /* Remove this subscription */
201 REMOVE_ELEM( p_bank->pp_sub, p_bank->i_sub, i_index );
203 vlc_mutex_unlock( &p_bank->lock );
206 /*****************************************************************************
207 * __msg_*: print a message
208 *****************************************************************************
209 * These functions queue a message for later printing.
210 *****************************************************************************/
211 void __msg_Generic( vlc_object_t *p_this, int i_type, const char *psz_module,
212 const char *psz_format, ... ) ATTRIBUTE_FORMAT( 4, 5 )
216 va_start( args, psz_format );
217 QueueMsg( p_this, i_type, psz_module, psz_format, args );
221 /* Generic functions used when variadic macros are not available. */
222 #define DECLARE_MSG_FN( FN_NAME, FN_TYPE ) \
223 void FN_NAME( void *p_this, const char *psz_format, ... ) \
224 ATTRIBUTE_FORMAT( 2, 3 ) \
227 va_start( args, psz_format ); \
228 QueueMsg( (vlc_object_t *)p_this, FN_TYPE, "unknown", \
229 psz_format, args ); \
234 DECLARE_MSG_FN( __msg_Info, VLC_MSG_INFO );
235 DECLARE_MSG_FN( __msg_Err, VLC_MSG_ERR );
236 DECLARE_MSG_FN( __msg_Warn, VLC_MSG_WARN );
237 DECLARE_MSG_FN( __msg_Dbg, VLC_MSG_DBG );
239 /*****************************************************************************
240 * QueueMsg: add a message to a queue
241 *****************************************************************************
242 * This function provides basic functionnalities to other msg_* functions.
243 * It adds a message to a queue (after having printed all stored messages if it
244 * is full). If the message can't be converted to string in memory, it issues
246 *****************************************************************************/
247 static void QueueMsg( vlc_object_t *p_this, int i_type, const char *psz_module,
248 const char *psz_format, va_list args )
250 msg_bank_t * p_bank = &p_this->p_libvlc->msg_bank; /* message bank */
251 char * psz_str = NULL; /* formatted message string */
252 msg_item_t * p_item = NULL; /* pointer to message */
253 msg_item_t item; /* message in case of a full queue */
255 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN)
256 int i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
260 * Convert message to string
262 #if defined(HAVE_VASPRINTF) && !defined(SYS_DARWIN)
263 vasprintf( &psz_str, psz_format, args );
265 psz_str = (char*) malloc( i_size * sizeof(char) );
268 if( psz_str == NULL )
271 fprintf( stderr, "main warning: can't store message (%s): ",
274 fprintf( stderr, "main warning: can't store message: " );
276 vfprintf( stderr, psz_format, args );
277 fprintf( stderr, "\n" );
281 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN)
282 vsnprintf( psz_str, i_size, psz_format, args );
283 psz_str[ i_size - 1 ] = 0; /* Just in case */
286 /* Put message in queue */
287 vlc_mutex_lock( &p_bank->lock );
289 /* Check there is room in the queue for our message */
290 if( p_bank->b_overflow )
294 if( ((p_bank->i_stop - p_bank->i_start + 1) % VLC_MSG_QSIZE) == 0 )
296 /* Still in overflow mode, print from a dummy item */
301 /* Pheeew, at last, there is room in the queue! */
302 p_bank->b_overflow = VLC_FALSE;
305 else if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
309 if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
311 p_bank->b_overflow = VLC_TRUE;
313 /* Put the overflow message in the queue */
314 p_item = p_bank->msg + p_bank->i_stop;
315 p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
317 p_item->i_type = VLC_MSG_ERR;
318 p_item->i_object_id = p_this->i_object_id;
319 p_item->i_object_type = p_this->i_object_type;
320 p_item->psz_module = strdup( "message" );
321 p_item->psz_msg = strdup( "message queue overflowed" );
323 PrintMsg( p_this, p_item );
325 /* We print from a dummy item */
330 if( !p_bank->b_overflow )
332 /* Put the message in the queue */
333 p_item = p_bank->msg + p_bank->i_stop;
334 p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
337 /* Fill message information fields */
338 p_item->i_type = i_type;
339 p_item->i_object_id = p_this->i_object_id;
340 p_item->i_object_type = p_this->i_object_type;
341 p_item->psz_module = strdup( psz_module );
342 p_item->psz_msg = psz_str;
344 PrintMsg( p_this, p_item );
346 if( p_bank->b_overflow )
348 free( p_item->psz_module );
349 free( p_item->psz_msg );
352 vlc_mutex_unlock( &p_bank->lock );
355 /* following functions are local */
357 /*****************************************************************************
359 *****************************************************************************
360 * Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
361 * this function does not check the lock.
362 *****************************************************************************/
363 static void FlushMsg ( msg_bank_t *p_bank )
365 int i_index, i_start, i_stop;
367 /* Only flush the queue if it has been properly configured */
368 if( !p_bank->b_configured )
373 /* Get the maximum message index that can be freed */
374 i_stop = p_bank->i_stop;
376 /* Check until which value we can free messages */
377 for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
379 i_start = p_bank->pp_sub[ i_index ]->i_start;
381 /* If this subscriber is late, we don't free messages before
382 * his i_start value, otherwise he'll miss messages */
383 if( ( i_start < i_stop
384 && (p_bank->i_stop <= i_start || i_stop <= p_bank->i_stop) )
385 || ( i_stop < i_start
386 && (i_stop <= p_bank->i_stop && p_bank->i_stop <= i_start) ) )
392 /* Free message data */
393 for( i_index = p_bank->i_start;
395 i_index = (i_index+1) % VLC_MSG_QSIZE )
397 free( p_bank->msg[i_index].psz_msg );
398 free( p_bank->msg[i_index].psz_module );
401 /* Update the new start value */
402 p_bank->i_start = i_index;
405 /*****************************************************************************
406 * PrintMsg: output a message item to stderr
407 *****************************************************************************
408 * Print a message to stderr, with colour formatting if needed.
409 *****************************************************************************/
410 static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
412 # define COL(x) "\033[" #x ";1m"
414 # define GREEN COL(32)
415 # define YELLOW COL(33)
416 # define WHITE COL(37)
417 # define GRAY "\033[0m"
422 static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
423 static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
424 char *psz_object = "private";
425 int i_type = p_item->i_type;
430 if( p_this->p_libvlc->i_verbose < 0 ) return;
433 if( p_this->p_libvlc->i_verbose < 0 ) return;
436 if( p_this->p_libvlc->i_verbose < 1 ) return;
439 if( p_this->p_libvlc->i_verbose < 2 ) return;
443 switch( p_item->i_object_type )
445 case VLC_OBJECT_ROOT: psz_object = "root"; break;
446 case VLC_OBJECT_VLC: psz_object = "vlc"; break;
447 case VLC_OBJECT_MODULE: psz_object = "module"; break;
448 case VLC_OBJECT_INTF: psz_object = "interface"; break;
449 case VLC_OBJECT_PLAYLIST: psz_object = "playlist"; break;
450 case VLC_OBJECT_ITEM: psz_object = "item"; break;
451 case VLC_OBJECT_INPUT: psz_object = "input"; break;
452 case VLC_OBJECT_DECODER: psz_object = "decoder"; break;
453 case VLC_OBJECT_VOUT: psz_object = "video output"; break;
454 case VLC_OBJECT_AOUT: psz_object = "audio output"; break;
455 case VLC_OBJECT_SOUT: psz_object = "stream output"; break;
459 # define CE_WRITE(str) WriteFile( p_this->p_libvlc->msg_bank.logfile, \
460 str, strlen(str), &i_dummy, NULL );
461 CE_WRITE( p_item->psz_module );
463 CE_WRITE( psz_object );
464 CE_WRITE( ppsz_type[i_type] );
466 CE_WRITE( p_item->psz_msg );
468 FlushFileBuffers( p_this->p_libvlc->msg_bank.logfile );
471 /* Send the message to stderr */
472 if( p_this->p_libvlc->b_color )
474 fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
475 p_item->i_object_id, p_item->psz_module, psz_object,
476 ppsz_type[i_type], ppsz_color[i_type],
481 fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
482 p_item->psz_module, psz_object, ppsz_type[i_type],