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 <stdarg.h>
  24 #include <stdlib.h>
  25
  26 #include "sync_chain.h"
  27 #include "event_processing_lttng_common.h"
  28
  29 #include "event_processing_lttng_null.h"
  30
  31
  32 // Functions common to all processing modules
  33 static void initProcessingLTTVNull(SyncState* const syncState, ...);
  34 static void destroyProcessingLTTVNull(SyncState* const syncState);
  35
  36 static void finalizeProcessingLTTVNull(SyncState* const syncState);
  37
  38 // Functions specific to this module
  39 static gboolean processEventLTTVNull(void* hookData, void* callData);
  40
  41
  42 static ProcessingModule processingModuleLTTVNull = {
  43         .name= "LTTV-null",
  44         .initProcessing= &initProcessingLTTVNull,
  45         .destroyProcessing= &destroyProcessingLTTVNull,
  46         .finalizeProcessing= &finalizeProcessingLTTVNull,
  47 };
  48
  49
  50
  51 /*
  52  * Processing Module registering function
  53  */
  54 void registerProcessingLTTVNull()
  55 {
  56         g_queue_push_tail(&processingModules, &processingModuleLTTVNull);
  57
  58         createQuarks();
  59 }
  60
  61
  62 /*
  63  * Allocate and initialize data structures for synchronizing a traceset.
  64  * Register event hooks.
  65  *
  66  * Args:
  67  *   syncState:    container for synchronization data.
  68  *                 This function allocates these processingData members:
  69  *                 hookListList
  70  *   traceSetContext: LttvTracesetContext*, set of LTTV traces
  71  */
  72 static void initProcessingLTTVNull(SyncState* const syncState, ...)
  73 {
  74         ProcessingDataLTTVNull* processingData;
  75         va_list ap;
  76
  77         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  78         syncState->processingData= processingData;
  79         va_start(ap, syncState);
  80         processingData->traceSetContext= va_arg(ap, LttvTracesetContext*);
  81         va_end(ap);
  82         syncState->traceNb=
  83                 lttv_traceset_number(processingData->traceSetContext->ts);
  84         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  85                 sizeof(GArray*), syncState->traceNb);
  86
  87         registerHooks(processingData->hookListList,
  88                 processingData->traceSetContext, &processEventLTTVNull, syncState,
  89                 syncState->matchingModule->canMatch);
  90 }
  91
  92
  93 /*
  94  * Nothing to do
  95  *
  96  * Args:
  97  *   syncState     container for synchronization data.
  98  */
  99 static void finalizeProcessingLTTVNull(SyncState* const syncState)
 100 {
 101         return;
 102 }
 103
 104
 105 /*
 106  * Unregister event hooks. Deallocate processingData.
 107  *
 108  * Args:
 109  *   syncState:    container for synchronization data.
 110  *                 This function deallocates these members:
 111  *                 hookListList
 112  */
 113 static void destroyProcessingLTTVNull(SyncState* const syncState)
 114 {
 115         ProcessingDataLTTVNull* processingData;
 116
 117         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 118
 119         if (processingData == NULL)
 120         {
 121                 return;
 122         }
 123
 124         unregisterHooks(processingData->hookListList,
 125                 processingData->traceSetContext);
 126
 127         free(syncState->processingData);
 128         syncState->processingData= NULL;
 129 }
 130
 131
 132 /*
 133  * Lttv hook function that will be called for network events
 134  *
 135  * Args:
 136  *   hookData:     LttvTraceHook* for the type of event that generated the call
 137  *   callData:     LttvTracefileContext* at the moment of the event
 138  *
 139  * Returns:
 140  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 141  *                 this event
 142  */
 143 static gboolean processEventLTTVNull(void* hookData, void* callData)
 144 {
 145         return FALSE;
 146 }