1 files changed, 300 insertions, 0 deletions
diff --git a/daemon/Child.cpp b/daemon/Child.cpp
new file mode 100644
index 0000000..0abfd1a
--- /dev/null
+++ b/daemon/Child.cpp
@@ -0,0 +1,300 @@
+/**
+ * Copyright (C) ARM Limited 2010-2011. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+typedef unsigned long long uint64_t;
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/syscall.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+#include "Logging.h"
+#include "CapturedXML.h"
+#include "SessionData.h"
+#include "Child.h"
+#include "LocalCapture.h"
+#include "Collector.h"
+#include "Sender.h"
+#include "OlyUtility.h"
+#include "StreamlineSetup.h"
+
+static sem_t haltPipeline, senderThreadStarted, startProfile; // Shared by Child and spawned threads
+static Fifo* collectorFifo = NULL;   // Shared by Child.cpp and spawned threads
+static Sender* sender = NULL;        // Shared by Child.cpp and spawned threads
+Collector* collector = NULL;         // shared by Child.cpp and ConfigurationXML.cpp
+Child* child = NULL;                 // shared by Child.cpp and main.cpp
+
+extern void cleanUp();
+void handleException() {
+	if (child && child->numExceptions++ > 0) {
+		// it is possible one of the below functions itself can cause an exception, thus allow only one exception
+		logg->logMessage("Received multiple exceptions, terminating the child");
+		exit(1);
+	}
+	fprintf(stderr, "%s", logg->getLastError());
+
+	if (child && child->socket) {
+		if (sender) {
+			// send the error, regardless of the command sent by Streamline
+			sender->writeData(logg->getLastError(), strlen(logg->getLastError()), RESPONSE_ERROR);
+
+			// cannot close the socket before Streamline issues the command, so wait for the command before exiting
+			if (gSessionData.mWaitingOnCommand) {
+				char discard;
+				child->socket->receiveNBytes(&discard, 1);
+			}
+
+			// this indirectly calls close socket which will ensure the data has been sent
+			delete sender;
+		}
+	}
+
+	if (gSessionData.mLocalCapture)
+		cleanUp();
+
+	exit(1);
+}
+
+// CTRL C Signal Handler for child process
+void child_handler(int signum) {
+	static bool beenHere = false;
+	if (beenHere == true) {
+		logg->logMessage("Gator is being forced to shut down.");
+		exit(1);
+	}
+	beenHere = true;
+	logg->logMessage("Gator is shutting down.");
+	if (signum == SIGALRM || !collector) {
+		exit(1);
+	} else {
+		child->endSession();
+		alarm(5); // Safety net in case endSession does not complete within 5 seconds
+	}
+}
+
+void* durationThread(void* pVoid) {
+	prctl(PR_SET_NAME, (unsigned int)&"gatord-duration", 0, 0, 0);
+	sem_wait(&startProfile);
+	if (gSessionData.mSessionIsActive) {
+		// Time out after duration seconds
+		// Add a second for host-side filtering
+		sleep(gSessionData.mDuration + 1);
+		if (gSessionData.mSessionIsActive) {
+			logg->logMessage("Duration expired.");
+			child->endSession();
+		}
+	}
+	logg->logMessage("Exit duration thread");
+	return 0;
+}
+
+void* stopThread(void* pVoid) {
+	int length;
+	char type;
+	OlySocket* socket = child->socket;
+
+	prctl(PR_SET_NAME, (unsigned int)&"gatord-stopper", 0, 0, 0);
+	while (gSessionData.mSessionIsActive) {
+		// This thread will stall until the APC_STOP or PING command is received over the socket or the socket is disconnected
+		if (socket->receiveNBytes(&type, sizeof(type)) > 0) {
+			if ((type != COMMAND_APC_STOP) && (type != COMMAND_PING)) {
+				logg->logMessage("INVESTIGATE: Received unknown command type %d", type);
+			} else {
+				// verify a length of zero
+				if (socket->receiveNBytes((char*)&length, sizeof(length)) < 0) {
+					break;
+				}
+
+				if (length == 0) {
+					if (type == COMMAND_APC_STOP) {
+						logg->logMessage("Stop command received.");
+						child->endSession();
+					} else {
+						// Ping is used to make sure gator is alive and requires an ACK as the response
+						logg->logMessage("Ping command received.");
+						sender->writeData(NULL, 0, RESPONSE_ACK);
+					}
+				} else {
+					logg->logMessage("INVESTIGATE: Received stop command but with length = %d", length);
+				}
+			}
+		}
+	}
+
+	logg->logMessage("Exit stop thread");
+	return 0;
+}
+
+void* senderThread(void* pVoid) {
+	int length;
+	char* data;
+
+	sem_post(&senderThreadStarted);
+	prctl(PR_SET_NAME, (unsigned int)&"gatord-sender", 0, 0, 0);
+	sem_wait(&haltPipeline);
+
+	do {
+		data = collectorFifo->read(&length);
+		sender->writeData(data, length, RESPONSE_APC_DATA);
+	} while (length > 0);
+	logg->logMessage("Exit sender thread");
+	return 0;
+}
+
+Child::Child(char* path) {
+	initialization();
+	sessionXMLPath = path;
+}
+
+Child::Child(OlySocket* sock, int conn) {
+	initialization();
+	socket = sock;
+	numConnections = conn;
+}
+
+Child::~Child() {
+}
+
+void Child::initialization() {
+	// Set up different handlers for signals
+	gSessionData.mSessionIsActive = true;
+	signal(SIGINT, child_handler);
+	signal(SIGTERM, child_handler);
+	signal(SIGABRT, child_handler);
+	signal(SIGALRM, child_handler);
+	socket = NULL;
+	numExceptions = 0;
+	numConnections = 0;
+	sessionXMLPath = 0;
+
+	// Initialize semaphores
+	sem_init(&senderThreadStarted, 0, 0);
+	sem_init(&startProfile, 0, 0);
+}
+
+void Child::endSession() {
+	gSessionData.mSessionIsActive = false;
+	collector->stop();
+	sem_post(&haltPipeline);
+	sem_post(&haltPipeline);
+}
+
+void Child::run() {
+	char* collectBuffer;
+	int bytesCollected = 0;
+	LocalCapture* localCapture = NULL;
+
+	prctl(PR_SET_NAME, (unsigned int)&"gatord-child", 0, 0, 0);
+
+	// Instantiate the Sender - must be done first, afterwhich error messages can be sent
+	sender = new Sender(socket);
+
+	if (numConnections > 1) {
+		logg->logError(__FILE__, __LINE__, "Session already in progress");
+		handleException();
+	}
+
+	// Set up the driver
+	collector = new Collector();
+
+	// Start up and parse session xml
+	if (socket) {
+		// Respond to Streamline requests
+		StreamlineSetup ss(socket);
+	} else {
+		xmlString = util->readFromDisk(sessionXMLPath);
+		gSessionData.mLocalCapture = true;
+		if (xmlString == 0) {
+			logg->logError(__FILE__, __LINE__, "Unable to read session xml file: %s", sessionXMLPath);
+			handleException();
+		}
+		gSessionData.parseSessionXML(xmlString);
+		localCapture = new LocalCapture();
+		localCapture->createAPCDirectory(gSessionData.target_path, gSessionData.title);
+		localCapture->copyImages(gSessionData.images);
+		localCapture->write(xmlString);
+		sender->createDataFile(gSessionData.apcDir);
+		delete xmlString;
+	}
+
+	// Create user-space buffers to pass the driver data to the socket driver
+	// Could optimize by using a zero-copy pipe/splice to copy directly from the gator driver to the socket buffer
+	int fifoBufferSize = collector->getBufferSize();
+	int numCollectorBuffers = (gSessionData.mTotalBufferSize * 1024 * 1024 + fifoBufferSize - 1) / fifoBufferSize;
+	numCollectorBuffers = (numCollectorBuffers < 4) ? 4 : numCollectorBuffers;
+	logg->logMessage("Created %d %d-byte collector buffers", numCollectorBuffers, fifoBufferSize);
+	collectorFifo = new Fifo(numCollectorBuffers, fifoBufferSize);
+
+	// Get the initial pointer to the collect buffer
+	collectBuffer = collectorFifo->start();
+
+	// Sender thread shall be halted until it is signaled for one shot mode
+	sem_init(&haltPipeline, 0, gSessionData.mOneShot ? 0 : 2);
+
+	// Create the duration, stop, and sender threads
+	bool thread_creation_success = true;
+	if (gSessionData.mDuration > 0 && pthread_create(&durationThreadID, NULL, durationThread, NULL))
+		thread_creation_success = false;
+	else if (socket && pthread_create(&stopThreadID, NULL, stopThread, NULL))
+		thread_creation_success = false;
+	else if (pthread_create(&senderThreadID, NULL, senderThread, NULL))
+		thread_creation_success = false;
+	if (!thread_creation_success) {
+		logg->logError(__FILE__, __LINE__, "Failed to create gator threads");
+		handleException();
+	}
+
+	// Wait until thread has started
+	sem_wait(&senderThreadStarted);
+
+	// Start profiling
+	logg->logMessage("********** Profiling started **********");
+	collector->start();
+	sem_post(&startProfile);
+
+	// Collect Data
+	do {
+		// This command will stall until data is received from the driver
+		bytesCollected = collector->collect(collectBuffer);
+
+		// In one shot mode, stop collection once all the buffers are filled
+		if (gSessionData.mOneShot && gSessionData.mSessionIsActive) {
+			// Depth minus 1 because write() has not yet been called
+			if ((bytesCollected == -1) || (collectorFifo->numWriteToReadBuffersFilled() == collectorFifo->depth() - 1)) {
+				logg->logMessage("One shot");
+				endSession();
+			}
+		}
+		collectBuffer = collectorFifo->write(bytesCollected);
+	} while (bytesCollected > 0);
+	logg->logMessage("Exit collect data loop");
+
+	// Wait for the other threads to exit
+	pthread_join(senderThreadID, NULL);
+
+	// Shutting down the connection should break the stop thread which is stalling on the socket recv() function
+	if (socket) {
+		logg->logMessage("Waiting on stop thread");
+		socket->shutdownConnection();
+		pthread_join(stopThreadID, NULL);
+	}
+
+	// Write the captured xml file
+	if (gSessionData.mLocalCapture) {
+		CapturedXML capturedXML;
+		capturedXML.write(gSessionData.apcDir);
+	}
+
+	logg->logMessage("Profiling ended.");
+
+	delete collectorFifo;
+	delete sender;
+	delete collector;
+	delete localCapture;
+}