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 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 }
  96
  97
  98 /*
  99  * Nothing to do
 100  *
 101  * Args:
 102  *   syncState     container for synchronization data.
 103  */
 104 static void finalizeProcessingLTTVNull(SyncState* const syncState)
 105 {
 106         return;
 107 }
 108
 109
 110 /*
 111  * Unregister event hooks. Deallocate processingData.
 112  *
 113  * Args:
 114  *   syncState:    container for synchronization data.
 115  *                 This function deallocates these members:
 116  *                 hookListList
 117  */
 118 static void destroyProcessingLTTVNull(SyncState* const syncState)
 119 {
 120         ProcessingDataLTTVNull* processingData;
 121
 122         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 123
 124         if (processingData == NULL)
 125         {
 126                 return;
 127         }
 128
 129         unregisterHooks(processingData->hookListList,
 130                 processingData->traceSetContext);
 131
 132         free(syncState->processingData);
 133         syncState->processingData= NULL;
 134 }
 135
 136
 137 /*
 138  * Lttv hook function that will be called for network events
 139  *
 140  * Args:
 141  *   hookData:     LttvTraceHook* for the type of event that generated the call
 142  *   callData:     LttvTracefileContext* at the moment of the event
 143  *
 144  * Returns:
 145  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 146  *                 this event
 147  */
 148 static gboolean processEventLTTVNull(void* hookData, void* callData)
 149 {
 150         return FALSE;
 151 }