REFAC: ProcessResolver

The new version now uses smart pointers instead of raw new and delete
and also switched to using STL type for its API instead of Qt types.

src/ProcessResolver.cpp

@@ -6,59 +6,45 @@
 #include "ProcessResolver.h"
 #include <cstring>
 
-ProcessResolver::ProcessResolver(bool resolveImmediately) : m_processNames(), m_processPIDs() {
+ProcessResolver::ProcessResolver(bool resolveImmediately) : m_processMap() {
 	if (resolveImmediately) {
 		resolve();
 	}
 }
 
 ProcessResolver::~ProcessResolver() {
-	freeAndClearData();
+	m_processMap.clear();
 }
 
-void ProcessResolver::freeAndClearData() {
-	// delete all names
-	for (const char *currentName : m_processNames) {
-		delete[] currentName;
-	}
-
-	m_processNames.clear();
-	m_processPIDs.clear();
-}
-
-const QVector< const char * > &ProcessResolver::getProcessNames() const {
-	return m_processNames;
-}
-
-const QVector< uint64_t > &ProcessResolver::getProcessPIDs() const {
-	return m_processPIDs;
+const ProcessResolver::ProcessMap &ProcessResolver::getProcessMap() const {
+	return m_processMap;
 }
 
 void ProcessResolver::resolve() {
 	// first clear the current lists
-	freeAndClearData();
+	m_processMap.clear();
 
 	doResolve();
 }
 
 size_t ProcessResolver::amountOfProcesses() const {
-	return m_processPIDs.size();
+	return m_processMap.size();
 }
 
 
-/// Helper function to add a name stored as a stack-variable to the given vector
+/// Helper function for adding an entry to the given process map
 ///
-/// @param stackName The pointer to the stack-variable
-/// @param destVec The destination vector to add the pointer to
-void addName(const char *stackName, QVector< const char * > &destVec) {
-	// We can't store the pointer of a stack-variable (will be invalid as soon as we exit scope)
-	// so we'll have to allocate memory on the heap and copy the name there.
-	size_t nameLength = std::strlen(stackName) + 1; // +1 for terminating NULL-byte
-	char *name        = new char[nameLength];
+/// @param pid The process's PID
+/// @param processName The name of the process
+/// @param map The map to add the entry to
+void addEntry(uint64_t pid, const char *processName, ProcessResolver::ProcessMap &map) {
+	// 	In order to make sure the name pointer stays valid until we need it, we have ot copy it
+	const size_t nameLength            = std::strlen(processName) + 1; // +1 for terminating NULL-byte
+	std::unique_ptr< char[] > nameCopy = std::make_unique< char[] >(nameLength);
 
-	std::strcpy(name, stackName);
+	std::strcpy(nameCopy.get(), processName);
 
-	destVec.append(name);
+	map.insert(std::make_pair(pid, std::move(nameCopy)));
 }
 
 // The implementation of the doResolve-function is platfrom-dependent
@@ -113,11 +99,7 @@ void ProcessResolver::doResolve() {
 
 	while (ok) {
 		if (utf16ToUtf8(pe.szExeFile, sizeof(name), name)) {
-			// Store name
-			addName(name, m_processNames);
-
-			// Store corresponding PID
-			m_processPIDs.append(pe.th32ProcessID);
+			addEntry(pe.th32ProcessID, name, m_processMap);
 		}
 #	ifndef QT_NO_DEBUG
 		else {
@@ -188,11 +170,7 @@ void ProcessResolver::doResolve() {
 		}
 
 		if (!baseName.isEmpty()) {
-			// add name
-			addName(baseName.toUtf8().data(), m_processNames);
-
-			// add corresponding PID
-			m_processPIDs.append(pid);
+			addEntry(pid, baseName.toUtf8().constData(), m_processMap);
 		}
 	}
 }
@@ -209,11 +187,7 @@ void ProcessResolver::doResolve() {
 		struct proc_bsdinfo proc;
 		int st = proc_pidinfo(pids[i], PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
 		if (st == PROC_PIDTBSDINFO_SIZE) {
-			// add name
-			addName(proc.pbi_name, m_processNames);
-
-			// add corresponding PID
-			m_processPIDs.append(pids[i]);
+			addEntry(pids[i], proc.pbi_name, m_processMap);
 		}
 	}
 }
@@ -234,11 +208,7 @@ void ProcessResolver::doResolve() {
 	}
 
 	for (int i = 0; i < n_procs; ++i) {
-		// Add name
-		addName(procs_info[i].ki_comm, m_processNames);
-
-		// Add corresponding PID
-		m_processPIDs.append(procs_info[i].ki_pid);
+		addEntry(procs_info[i].ki_pid, procs_info[i].ki_comm, m_processMap);
 	}
 
 	free(procs_info);
@@ -291,11 +261,7 @@ void ProcessResolver::doResolve() {
 	}
 
 	for (int i = 0; i < n_procs; ++i) {
-		// Add name
-		addName(procs_info[i].ki_comm, m_processNames);
-
-		// Add corresponding PIDs
-		m_processPIDs.append(procs_info[i].ki_pid);
+		addEntry(procs_info[i].ki_pid, procs_info[i].ki_comm, m_processMap);
 	}
 
 	kvm_cleanup(kd);

src/ProcessResolver.h

@@ -9,35 +9,33 @@
 #include <QtCore/QVector>
 
 #include <cstdint>
+#include <memory>
+#include <unordered_map>
 
 /// This ProcessResolver can be used to get a QVector of running process names and associated PIDs on multiple
 /// platforms. This object is by no means thread-safe!
 class ProcessResolver {
-protected:
-	/// The vector for the pointers to the process names
-	QVector< const char * > m_processNames;
-	/// The vector for the process PIDs
-	QVector< uint64_t > m_processPIDs;
-
-	/// Deletes all names currently stored in processNames and clears processNames and processPIDs
-	void freeAndClearData();
-	/// The OS specific implementation of filling in details about running process names and PIDs
-	void doResolve();
-
 public:
+	using ProcessMap = std::unordered_map< uint64_t, std::unique_ptr< char[] > >;
+
 	/// @param resolveImmediately Whether the constructor should directly invoke ProcesResolver::resolve()
 	ProcessResolver(bool resolveImmediately = true);
 	virtual ~ProcessResolver();
 
 	/// Resolves the namaes and PIDs of the running processes
 	void resolve();
-	/// Gets a reference to the stored process names
-	const QVector< const char * > &getProcessNames() const;
-	/// Gets a reference to the stored process PIDs (corresponding to the names returned by
-	/// ProcessResolver::getProcessNames())
-	const QVector< uint64_t > &getProcessPIDs() const;
+	/// @returns The ProcessMap holding the mapping between PID and process name of all processes
+	/// found by this resolver
+	const ProcessMap &getProcessMap() const;
 	/// @returns The amount of processes that have been resolved by this object
 	size_t amountOfProcesses() const;
+
+protected:
+	/// A map containing the PID->name mapping for the found processes
+	ProcessMap m_processMap;
+
+	/// The OS specific implementation of filling in details about running process names and PIDs
+	void doResolve();
 };
 
 #endif // MUMBLE_PROCESS_RESOLVER_H_

src/mumble/PluginManager.cpp

@@ -29,7 +29,9 @@
 #include "ServerHandler.h"
 #include "Global.h"
 
+#include <cstdint>
 #include <memory>
+#include <vector>
 
 #ifdef Q_OS_WIN
 #	include <tlhelp32.h>
@@ -199,7 +201,18 @@ bool PluginManager::selectActivePositionalDataPlugin() {
 		return false;
 	}
 
-	ProcessResolver procRes(true);
+	const ProcessResolver procRes(true);
+	const ProcessResolver::ProcessMap &map = procRes.getProcessMap();
+
+	// We require 2 separate arrays holding the names and the PIDs -> create them from the given map
+	std::vector< uint64_t > pids;
+	std::vector< const char * > names;
+	pids.reserve(procRes.amountOfProcesses());
+	names.reserve(procRes.amountOfProcesses());
+	for (const std::pair< const uint64_t, std::unique_ptr< char[] > > &currentEntry : map) {
+		pids.push_back(currentEntry.first);
+		names.push_back(currentEntry.second.get());
+	}
 
 	auto it = m_pluginHashMap.begin();
 
@@ -209,8 +222,7 @@ bool PluginManager::selectActivePositionalDataPlugin() {
 		plugin_ptr_t currentPlugin = it.value();
 
 		if (currentPlugin->isPositionalDataEnabled() && currentPlugin->isLoaded()) {
-			switch (currentPlugin->initPositionalData(procRes.getProcessNames().data(), procRes.getProcessPIDs().data(),
-													  procRes.amountOfProcesses())) {
+			switch (currentPlugin->initPositionalData(names.data(), pids.data(), procRes.amountOfProcesses())) {
 				case PDEC_OK:
 					// the plugin is ready to provide positional data
 					m_activePositionalDataPlugin = currentPlugin;