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 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: LttvTracesetContext*, set of LTTV traces
  72  */
  73 static void initProcessingLTTVNull(SyncState* const syncState, ...)
  74 {
  75         ProcessingDataLTTVNull* processingData;
  76         va_list ap;
  77
  78         processingData= malloc(sizeof(ProcessingDataLTTVNull));
  79         syncState->processingData= processingData;
  80         va_start(ap, syncState);
  81         processingData->traceSetContext= va_arg(ap, LttvTracesetContext*);
  82         va_end(ap);
  83         syncState->traceNb=
  84                 lttv_traceset_number(processingData->traceSetContext->ts);
  85         processingData->hookListList= g_array_sized_new(FALSE, FALSE,
  86                 sizeof(GArray*), syncState->traceNb);
  87
  88         registerHooks(processingData->hookListList,
  89                 processingData->traceSetContext, &processEventLTTVNull, syncState,
  90                 syncState->matchingModule->canMatch);
  91 }
  92
  93
  94 /*
  95  * Nothing to do
  96  *
  97  * Args:
  98  *   syncState     container for synchronization data.
  99  */
 100 static void finalizeProcessingLTTVNull(SyncState* const syncState)
 101 {
 102         return;
 103 }
 104
 105
 106 /*
 107  * Unregister event hooks. Deallocate processingData.
 108  *
 109  * Args:
 110  *   syncState:    container for synchronization data.
 111  *                 This function deallocates these members:
 112  *                 hookListList
 113  */
 114 static void destroyProcessingLTTVNull(SyncState* const syncState)
 115 {
 116         ProcessingDataLTTVNull* processingData;
 117
 118         processingData= (ProcessingDataLTTVNull*) syncState->processingData;
 119
 120         if (processingData == NULL)
 121         {
 122                 return;
 123         }
 124
 125         unregisterHooks(processingData->hookListList,
 126                 processingData->traceSetContext);
 127
 128         free(syncState->processingData);
 129         syncState->processingData= NULL;
 130 }
 131
 132
 133 /*
 134  * Lttv hook function that will be called for network events
 135  *
 136  * Args:
 137  *   hookData:     LttvTraceHook* for the type of event that generated the call
 138  *   callData:     LttvTracefileContext* at the moment of the event
 139  *
 140  * Returns:
 141  *   FALSE         Always returns FALSE, meaning to keep processing hooks for
 142  *                 this event
 143  */
 144 static gboolean processEventLTTVNull(void* hookData, void* callData)
 145 {
 146         return FALSE;
 147 }