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 // Functions common to all processing modules
  32 static void initProcessingLTTVNull(SyncState* const syncState,
  33         LttvTracesetContext* const traceSetContext);
  34 static void destroyProcessingLTTVNull(SyncState* const syncState);
  35
  36 static void finalizeProcessingLTTVNull(SyncState* const syncState);
  37
  38 // Functions specific to this module
  39 static void registerProcessingLTTVNull() __attribute__((constructor (102)));
  40 static gboolean processEventLTTVNull(void* hookData, void* callData);
  41
  42
  43 static ProcessingModule processingModuleLTTVNull = {
  44         .name= "LTTV-null",
  45         .initProcessing= &initProcessingLTTVNull,
  46         .destroyProcessing= &destroyProcessingLTTVNull,
  47         .finalizeProcessing= &finalizeProcessingLTTVNull,
  48 };
  49
  50
  51
  52 /*
  53  * Processing Module registering function
  54  */
  55 static void registerProcessingLTTVNull()
  56 {
  57         g_queue_push_tail(&processingModules, &processingModuleLTTVNull);
  58
  59         createQuarks();
  60 }
  61
  62
  63 /*
  64  * Allocate and initialize data structures for synchronizing a traceset.
  65  * Register event hooks.
  66  *
  67  * Args:
  68  *   syncState:    container for synchronization data.
  69  *                 This function allocates these processingData members:
  70  *                 hookListList
  71  *   traceSetContext: set of LTTV traces
  72  */
  73 static void initProcessingLTTVNull(SyncState* const syncState,
  74         LttvTracesetContext* const traceSetContext)
  75 {
  76         ProcessingDataLTTVNull* processingData;
  77
  78         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  79         syncState->processingData= processingData;
  80         processingData->traceSetContext= traceSetContext;
  81
  82         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  83                 sizeof(GArray*), syncState->traceNb);
  84
  85         registerHooks(processingData->hookListList, traceSetContext,
  86                 &processEventLTTVNull, syncState,
  87                 syncState->matchingModule->canMatch);
  88 }
  89
  90
  91 /*
  92  * Nothing to do
  93  *
  94  * Args:
  95  *   syncState     container for synchronization data.
  96  */
  97 static void finalizeProcessingLTTVNull(SyncState* const syncState)
  98 {
  99         return;
 100 }
 101
 102
 103 /*
 104  * Unregister event hooks. Deallocate processingData.
 105  *
 106  * Args:
 107  *   syncState:    container for synchronization data.
 108  *                 This function deallocates these members:
 109  *                 hookListList
 110  */
 111 static void destroyProcessingLTTVNull(SyncState* const syncState)
 112 {
 113         ProcessingDataLTTVNull* processingData;
 114
 115         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 116
 117         if (processingData == NULL)
 118         {
 119                 return;
 120         }
 121
 122         unregisterHooks(processingData->hookListList,
 123                 processingData->traceSetContext);
 124
 125         free(syncState->processingData);
 126         syncState->processingData= NULL;
 127 }
 128
 129
 130 /*
 131  * Lttv hook function that will be called for network events
 132  *
 133  * Args:
 134  *   hookData:     LttvTraceHook* for the type of event that generated the call
 135  *   callData:     LttvTracefileContext* at the moment of the event
 136  *
 137  * Returns:
 138  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 139  *                 this event
 140  */
 141 static gboolean processEventLTTVNull(void* hookData, void* callData)
 142 {
 143         return FALSE;
 144 }