lttv/lttv/sync/event_processing_lttng_null.c

   1 /* This file is part of the Linux Trace Toolkit viewer
   2  * Copyright (C) 2009 Benjamin Poirier <benjamin.poirier@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  16  * MA 02111-1307, USA.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #include <stdlib.h>
  24
  25 #include "sync_chain_lttv.h"
  26 #include "event_processing_lttng_common.h"
  27
  28 #include "event_processing_lttng_null.h"
  29
  30
  31 #ifndef g_info
  32 #define g_info(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format)
  33 #endif
  34
  35
  36 // Functions common to all processing modules
  37 static void initProcessingLTTVNull(SyncState* const syncState,
  38         LttvTracesetContext* const traceSetContext);
  39 static void destroyProcessingLTTVNull(SyncState* const syncState);
  40
  41 static void finalizeProcessingLTTVNull(SyncState* const syncState);
  42
  43 // Functions specific to this module
  44 static void registerProcessingLTTVNull() __attribute__((constructor (102)));
  45 static gboolean processEventLTTVNull(void* hookData, void* callData);
  46
  47
  48 static ProcessingModule processingModuleLTTVNull = {
  49         .name= "LTTV-null",
  50         .initProcessing= &initProcessingLTTVNull,
  51         .destroyProcessing= &destroyProcessingLTTVNull,
  52         .finalizeProcessing= &finalizeProcessingLTTVNull,
  53         .printProcessingStats= NULL,
  54         .writeProcessingGraphsPlots= NULL,
  55         .writeProcessingGraphsOptions= NULL,
  56 };
  57
  58
  59
  60 /*
  61  * Processing Module registering function
  62  */
  63 static void registerProcessingLTTVNull()
  64 {
  65         g_queue_push_tail(&processingModules, &processingModuleLTTVNull);
  66
  67         createQuarks();
  68 }
  69
  70
  71 /*
  72  * Allocate and initialize data structures for synchronizing a traceset.
  73  * Register event hooks.
  74  *
  75  * Args:
  76  *   syncState:    container for synchronization data.
  77  *                 This function allocates these processingData members:
  78  *                 hookListList
  79  *   traceSetContext: set of LTTV traces
  80  */
  81 static void initProcessingLTTVNull(SyncState* const syncState,
  82         LttvTracesetContext* const traceSetContext)
  83 {
  84         ProcessingDataLTTVNull* processingData;
  85
  86         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  87         syncState->processingData= processingData;
  88         processingData->traceSetContext= traceSetContext;
  89
  90         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  91                 sizeof(GArray*), syncState->traceNb);
  92
  93         registerHooks(processingData->hookListList, traceSetContext,
  94                 &processEventLTTVNull, syncState,
  95                 syncState->matchingModule->canMatch);
  96 }
  97
  98
  99 /*
 100  * Nothing to do
 101  *
 102  * Args:
 103  *   syncState     container for synchronization data.
 104  */
 105 static void finalizeProcessingLTTVNull(SyncState* const syncState)
 106 {
 107         return;
 108 }
 109
 110
 111 /*
 112  * Unregister event hooks. Deallocate processingData.
 113  *
 114  * Args:
 115  *   syncState:    container for synchronization data.
 116  *                 This function deallocates these members:
 117  *                 hookListList
 118  */
 119 static void destroyProcessingLTTVNull(SyncState* const syncState)
 120 {
 121         ProcessingDataLTTVNull* processingData;
 122
 123         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 124
 125         if (processingData == NULL)
 126         {
 127                 return;
 128         }
 129
 130         unregisterHooks(processingData->hookListList,
 131                 processingData->traceSetContext);
 132
 133         free(syncState->processingData);
 134         syncState->processingData= NULL;
 135 }
 136
 137
 138 /*
 139  * Lttv hook function that will be called for network events
 140  *
 141  * Args:
 142  *   hookData:     LttvTraceHook* for the type of event that generated the call
 143  *   callData:     LttvTracefileContext* at the moment of the event
 144  *
 145  * Returns:
 146  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 147  *                 this event
 148  */
 149 static gboolean processEventLTTVNull(void* hookData, void* callData)
 150 {
 151         return FALSE;
 152 }