lttv/lttv/sync/event_processing_lttv_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.h"
  26 #include "event_processing_lttv_common.h"
  27
  28 #include "event_processing_lttv_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 matching 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 };
  55
  56
  57
  58 /*
  59  * Processing Module registering function
  60  */
  61 static void registerProcessingLTTVNull()
  62 {
  63         g_queue_push_tail(&processingModules, &processingModuleLTTVNull);
  64
  65         createQuarks();
  66 }
  67
  68
  69 /*
  70  * Allocate and initialize data structures for synchronizing a traceset.
  71  * Register event hooks.
  72  *
  73  * Args:
  74  *   syncState:    container for synchronization data.
  75  *                 This function allocates these processingData members:
  76  *                 hookListList
  77  *   traceSetContext: set of LTTV traces
  78  */
  79 static void initProcessingLTTVNull(SyncState* const syncState,
  80         LttvTracesetContext* const traceSetContext)
  81 {
  82         ProcessingDataLTTVNull* processingData;
  83
  84         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  85         syncState->processingData= processingData;
  86         processingData->traceSetContext= traceSetContext;
  87
  88         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  89                 sizeof(GArray*), syncState->traceNb);
  90
  91         registerHooks(processingData->hookListList, traceSetContext,
  92                 syncState->traceNb, &processEventLTTVNull, syncState);
  93 }
  94
  95
  96 /*
  97  * Nothing to do
  98  *
  99  * Args:
 100  *   syncState     container for synchronization data.
 101  */
 102 static void finalizeProcessingLTTVNull(SyncState* const syncState)
 103 {
 104         return;
 105 }
 106
 107
 108 /*
 109  * Unregister event hooks. Deallocate processingData.
 110  *
 111  * Args:
 112  *   syncState:    container for synchronization data.
 113  *                 This function deallocates these members:
 114  *                 hookListList
 115  */
 116 static void destroyProcessingLTTVNull(SyncState* const syncState)
 117 {
 118         ProcessingDataLTTVNull* processingData;
 119
 120         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 121
 122         if (processingData == NULL)
 123         {
 124                 return;
 125         }
 126
 127         unregisterHooks(processingData->hookListList,
 128                 processingData->traceSetContext, syncState->traceNb);
 129
 130         free(syncState->processingData);
 131         syncState->processingData= NULL;
 132 }
 133
 134
 135 /*
 136  * Lttv hook function that will be called for network events
 137  *
 138  * Args:
 139  *   hookData:     LttvTraceHook* for the type of event that generated the call
 140  *   callData:     LttvTracefileContext* at the moment of the event
 141  *
 142  * Returns:
 143  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 144  *                 this event
 145  */
 146 static gboolean processEventLTTVNull(void* hookData, void* callData)
 147 {
 148         return FALSE;
 149 }