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.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 };
  54
  55
  56
  57 /*
  58  * Processing Module registering function
  59  */
  60 static void registerProcessingLTTVNull()
  61 {
  62         g_queue_push_tail(&processingModules, &processingModuleLTTVNull);
  63
  64         createQuarks();
  65 }
  66
  67
  68 /*
  69  * Allocate and initialize data structures for synchronizing a traceset.
  70  * Register event hooks.
  71  *
  72  * Args:
  73  *   syncState:    container for synchronization data.
  74  *                 This function allocates these processingData members:
  75  *                 hookListList
  76  *   traceSetContext: set of LTTV traces
  77  */
  78 static void initProcessingLTTVNull(SyncState* const syncState,
  79         LttvTracesetContext* const traceSetContext)
  80 {
  81         ProcessingDataLTTVNull* processingData;
  82
  83         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  84         syncState->processingData= processingData;
  85         processingData->traceSetContext= traceSetContext;
  86
  87         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  88                 sizeof(GArray*), syncState->traceNb);
  89
  90         registerHooks(processingData->hookListList, traceSetContext,
  91                 &processEventLTTVNull, syncState,
  92                 syncState->matchingModule->canMatch);
  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);
 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 }