diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04764845..f44a16e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -615,7 +615,7 @@ if(NOT PIP_FREERTOS)
 	add_subdirectory("utils/translator")
 	add_subdirectory("utils/value_tree_translator")
 	if(PIP_UTILS AND (NOT CROSSTOOLS))
-		add_subdirectory("utils/system_test")
+		add_subdirectory("utils/system_calib")
 		add_subdirectory("utils/udp_file_transfer")
 		if(sodium_FOUND)
 			add_subdirectory("utils/system_daemon")
diff --git a/libs/main/system/piprocess.cpp b/libs/main/system/piprocess.cpp
index cedd417e..74730ec4 100644
--- a/libs/main/system/piprocess.cpp
+++ b/libs/main/system/piprocess.cpp
@@ -17,16 +17,17 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "piliterals_time.h"
 #include "pitime.h"
-#include "pitranslator.h"
 #ifndef MICRO_PIP
 
 #  include "piincludes_p.h"
+#  include "piliterals_bytes.h"
 #  include "piprocess.h"
+#  include "pitranslator.h"
 #  ifndef WINDOWS
 #	include <csignal>
 #	include <sys/wait.h>
+#	include <fcntl.h>
 #  endif
 #  ifdef MAC_OS
 #	include <crt_externs.h>
@@ -63,14 +64,189 @@
 //!
 
 
-PRIVATE_DEFINITION_START(PIProcess)
+namespace {
+enum PipeDirection {
+	PipeRead,
+	PipeWrite,
+	PipeLast = PipeWrite
+};
+
+enum StdFile {
+	StdIn,
+	StdOut,
+	StdErr,
+	StdLast = StdErr
+};
+
+constexpr int PipesDirections = PipeLast + 1;
+constexpr int StdFileCount    = StdLast + 1;
+
+#  ifdef WINDOWS
+using PipeHandleType = HANDLE;
+using SizeType       = DWORD;
+#  else
+using SizeType       = ssize_t;
+using PipeHandleType = int;
+#  endif
+
+#  ifdef WINDOWS
+PIString convertWindowsCmd(PIStringList sl) {
+	if (sl.isNotEmpty()) {
+		sl[0].replaceAll('/', '\\');
+		sl[0].quote();
+	}
+	return sl.join(' ');
+}
+#  else
+char * const * convertToCharArrays(const PIStringList & sl) {
+	char ** cc = new char *[sl.size() + 1];
+	for (int i = 0; i < sl.size_s(); ++i) {
+		cc[i] = const_cast<char *>(sl[i].data());
+	}
+	cc[sl.size()] = 0;
+	return cc;
+}
+#  endif
+
+} // namespace
+
+
+PRIVATE_DEFINITION_START(PIProcess)
+
 #  ifdef WINDOWS
-	STARTUPINFOA si;
 	PROCESS_INFORMATION pi;
 #  else
 	pid_t pid;
 #  endif
-	FILE *tf_in, *tf_out, *tf_err;
+	PipeHandleType pipes[StdFileCount][PipesDirections];
+	bool grab[StdFileCount];
+
+
+	void forEachPipe(std::function<void(PipeHandleType &)> func) {
+		for (int i = 0; i < StdFileCount; ++i) {
+			for (int j = 0; j < PipesDirections; ++j) {
+				func(pipes[i][j]);
+			}
+		}
+	}
+
+
+	void initGrab() {
+		for (int i = 0; i < StdFileCount; ++i) {
+			grab[i] = false;
+		}
+	}
+
+
+	bool createPipe(StdFile pipe_type) {
+		const int pt = pipe_type;
+#  ifdef WINDOWS
+		SECURITY_ATTRIBUTES saAttr;
+		saAttr.nLength              = sizeof(SECURITY_ATTRIBUTES);
+		saAttr.bInheritHandle       = TRUE;
+		saAttr.lpSecurityDescriptor = NULL;
+		if (!CreatePipe(&(pipes[pt][PipeRead]), &(pipes[pt][PipeWrite]), &saAttr, 0)) return false;
+		return true;
+#  else
+		int ret = pipe(pipes[pt]);
+		return ret != -1;
+#  endif
+		return false;
+	}
+
+
+	bool createPipes() {
+		for (int i = 0; i < StdFileCount; ++i) {
+			if (grab[i]) {
+				if (!createPipe(static_cast<StdFile>(i))) {
+					piCout << "CreatePipe failed";
+#  ifdef WINDOWS
+					piCout << GetLastError();
+#  endif
+					return false;
+				}
+			}
+		}
+#  ifdef WINDOWS
+		if (grab[StdIn]) SetHandleInformation(pipes[StdIn][PipeWrite], HANDLE_FLAG_INHERIT, 0);
+		if (grab[StdOut]) SetHandleInformation(pipes[StdOut][PipeRead], HANDLE_FLAG_INHERIT, 0);
+		if (grab[StdErr]) SetHandleInformation(pipes[StdErr][PipeRead], HANDLE_FLAG_INHERIT, 0);
+#  endif
+		return true;
+	}
+
+
+	void closePipe(StdFile pipe_type, PipeDirection direction) {
+		closePipe(pipes[pipe_type][direction]);
+	}
+
+
+	void closePipe(PipeHandleType & hpipe) {
+#  ifdef WINDOWS
+		if (hpipe != 0) {
+			CloseHandle(hpipe);
+			hpipe = 0;
+		}
+#  else
+		if (hpipe != -1) {
+			::close(hpipe);
+			hpipe = -1;
+		}
+#  endif
+	}
+
+
+	void closeAllPipes() {
+		forEachPipe([this](PipeHandleType & hpipe) { closePipe(hpipe); });
+	}
+
+
+	PIByteArray readPipe(StdFile pipe_type) {
+		if (!grab[pipe_type]) return {};
+		constexpr size_t read_buffer_size = 4_KiB;
+		PIByteArray read_buffer;
+		read_buffer.resize(read_buffer_size);
+		SizeType bytes_read = 0;
+		size_t offset       = 0;
+		while (1) {
+#  ifdef WINDOWS
+			DWORD available = 0;
+			bytes_read = 0;
+			PeekNamedPipe(pipes[pipe_type][PipeRead], nullptr, 0, nullptr, &available, nullptr);
+			if (available > 0) {
+				BOOL ok = ReadFile(pipes[pipe_type][PipeRead],
+							  read_buffer.data(offset),
+							  piMini(available, read_buffer.size() - offset),
+							  &bytes_read,
+							  nullptr);
+				if (!ok) bytes_read = 0;
+			}
+#  else
+			bytes_read = ::read(pipes[pipe_type][PipeRead], read_buffer.data(offset), read_buffer.size() - offset);
+#  endif
+			if (bytes_read > 0) {
+				offset += bytes_read;
+				read_buffer.resize(offset + read_buffer_size);
+			} else {
+				read_buffer.resize(offset);
+				break;
+			}
+		}
+		return read_buffer;
+	}
+
+
+	bool writePipe(const PIByteArray & data) {
+		SizeType sz = 0;
+#  ifdef WINDOWS
+		BOOL ok = WriteFile(pipes[StdIn][PipeWrite], data.data(), data.size(), &sz, NULL);
+		if (!ok) sz = 0;
+#  else
+		sz = ::write(pipes[StdIn][PipeWrite], data.data(), data.size());
+#  endif
+		return sz == data.size_s();
+	}
+
 PRIVATE_DEFINITION_END(PIProcess)
 
 
@@ -80,177 +256,129 @@ PIProcess::PIProcess(): PIThread() {
 	PRIVATE->pi.dwProcessId = 0;
 #  else
 	PRIVATE->pid = 0;
+	PRIVATE->forEachPipe([](PipeHandleType & pipe) { pipe = -1; });
 #  endif
-	is_exec = false;
-	g_in = g_out = g_err = false;
-	t_in = t_out = t_err = false;
-	PRIVATE->tf_in = PRIVATE->tf_out = PRIVATE->tf_err = 0;
-	env                                                = PIProcess::currentEnvironment();
+	exec_start    = false;
+	exec_finished = false;
+	PRIVATE->initGrab();
+	env = PIProcess::currentEnvironment();
 }
 
 
 PIProcess::~PIProcess() {
 	PIThread::stopAndWait();
-	if (t_in) f_in.remove();
-	if (t_out) f_out.remove();
-	if (t_err) f_err.remove();
+	PRIVATE->closeAllPipes();
 }
 
 
 void PIProcess::exec_() {
-	is_exec = false;
+	exec_finished = false;
+	exec_start    = false;
+	PRIVATE->closeAllPipes();
 	startOnce();
-	// cout << "exec wait" << endl;
-	while (!is_exec)
-		piMinSleep();
-	// cout << "exec end" << endl;
 }
 
 
 void PIProcess::startProc(bool detached) {
-	// cout << "run" << endl;
-	PIString str;
-	/// arguments convertion
-	int as = 0;
-	const char * argscc[args.size() + 1];
-	int argsl[args.size()];
-	for (int i = 0; i < args.size_s(); ++i) {
-		argscc[i] = args[i].data();
-		argsl[i]  = strlen(argscc[i]);
-		as += argsl[i] + 3;
-	}
-	argscc[args.size()] = 0;
-#  ifdef WINDOWS
-	char * a = new char[as];
-	memset(a, ' ', as - 1);
-	as = 0;
-	for (int i = 0; i < args.size_s(); ++i) {
-		str   = args[i];
-		a[as] = '"';
-		memcpy(&(a[as + 1]), argscc[i], argsl[i]);
-		a[as + argsl[i] + 1] = '"';
-		as += argsl[i] + 3;
-	}
-	a[as - 1] = 0;
-	// piCout << a;
-#  endif
-#  ifndef WINDOWS
-	/// environment convertion
-	const char * envcc[env.size() + 1];
-	envcc[env.size_s()] = 0;
-	for (int i = 0; i < env.size_s(); ++i) {
-		envcc[i] = env[i].data();
-	}
-#  endif
-	/// files for stdin/out/err
-	t_in = t_out = t_err = false;
-	if (f_in.path().isEmpty()) {
-		f_in.openTemporary(PIIODevice::ReadWrite);
-		t_in = true;
-	}
-	if (f_out.path().isEmpty()) {
-		f_out.openTemporary(PIIODevice::ReadWrite);
-		t_out = true;
-	}
-	if (f_err.path().isEmpty()) {
-		f_err.openTemporary(PIIODevice::ReadWrite);
-		t_err = true;
-	}
-
-	str     = args.front();
-	is_exec = true;
+	const PIString & str = args.front();
 	if (!detached) execStarted(str);
-#  ifndef WINDOWS
-	int pid_ = fork();
+	if (!PRIVATE->createPipes()) return;
+#  ifdef WINDOWS
+	STARTUPINFOA si;
+	piZeroMemory(si);
+	si.cb = sizeof(STARTUPINFOA);
+	if (PRIVATE->grab[StdIn]) si.hStdInput = PRIVATE->pipes[StdIn][PipeRead];
+	if (PRIVATE->grab[StdOut]) si.hStdOutput = PRIVATE->pipes[StdOut][PipeWrite];
+	if (PRIVATE->grab[StdErr]) si.hStdError = PRIVATE->pipes[StdErr][PipeWrite];
+	si.dwFlags |= STARTF_USESTDHANDLES;
+	const auto cmd = convertWindowsCmd(args);
+	if (CreateProcessA(0,                                                      // No module name (use command line)
+					   (LPSTR)cmd.data(),                                      // Command line
+	                   0,                                                      // Process handle not inheritable
+	                   0,                                                      // Thread handle not inheritable
+					   true,                                                   // Set handle inheritance to FALSE
+	                   detached ? DETACHED_PROCESS /*CREATE_NEW_CONSOLE*/ : 0, // Creation flags
+	                   0,                                                      // Use environment
+	                   wd.isEmpty() ? 0 : wd.data(),                           // Use working directory
+	                   &si,                                                    // Pointer to STARTUPINFO structure
+	                   &(PRIVATE->pi)))                                        // Pointer to PROCESS_INFORMATION structure
+	{
+		exec_start = true;
+		if (!detached) {
+			WaitForSingleObject(PRIVATE->pi.hProcess, INFINITE);
+			DWORD code = -1;
+			if (GetExitCodeProcess(PRIVATE->pi.hProcess, &code) != 0) exit_code = code;
+			exec_finished = true;
+		}
+		CloseHandle(PRIVATE->pi.hThread);
+		CloseHandle(PRIVATE->pi.hProcess);
+	} else {
+		piCoutObj << "\"CreateProcess\" error: %1"_tr("PIProcess").arg(errorString());
+	}
+#  else
+	auto largs = convertToCharArrays(args);
+	auto lenv  = convertToCharArrays(env);
+	int pid_   = fork();
 	if (!detached) PRIVATE->pid = pid_;
 	if (pid_ == 0) {
-#  endif
-		PRIVATE->tf_in = PRIVATE->tf_out = PRIVATE->tf_err = 0;
-		// cout << "exec " << tf_in << ", " << tf_out << ", " << tf_err << endl;
-		// cout << f_out.path() << endl;
-		if (g_in) PRIVATE->tf_in = freopen(f_in.path().data(), "r", stdin);
-		if (g_out) PRIVATE->tf_out = freopen(f_out.path().data(), "w", stdout);
-		if (g_err) PRIVATE->tf_err = freopen(f_err.path().data(), "w", stderr);
-
-#  ifdef WINDOWS
-		GetStartupInfoA(&(PRIVATE->si));
-		piZeroMemory(PRIVATE->pi);
-		if (CreateProcessA(0,                                                      // No module name (use command line)
-		                   a,                                                      // Command line
-		                   0,                                                      // Process handle not inheritable
-		                   0,                                                      // Thread handle not inheritable
-		                   false,                                                  // Set handle inheritance to FALSE
-		                   detached ? DETACHED_PROCESS /*CREATE_NEW_CONSOLE*/ : 0, // Creation flags
-		                   0,                                                      // envcc,         // Use environment
-		                   wd.isEmpty() ? 0 : wd.data(),                           // Use working directory
-						   &(PRIVATE->si),                                         // Pointer to STARTUPINFO structure
-		                   &(PRIVATE->pi)))                                        // Pointer to PROCESS_INFORMATION structure
-		{
-			if (!detached) {
-				WaitForSingleObject(PRIVATE->pi.hProcess, INFINITE);
-				DWORD code = -1;
-				if (GetExitCodeProcess(PRIVATE->pi.hProcess, &code) != 0) exit_code = code;
-			}
-			CloseHandle(PRIVATE->pi.hThread);
-			CloseHandle(PRIVATE->pi.hProcess);
-		} else {
-			piCoutObj << "\"CreateProcess\" error: %1"_tr("PIProcess").arg(errorString());
-		}
-#  endif
-#  ifndef WINDOWS
 		if (!wd.isEmpty()) {
 			if (!chdir(wd.data())) piCoutObj << "Error while set working directory";
 		}
-		// cout << "exec " << tf_in << ", " << tf_out << ", " << tf_err << endl;
-		if (execve(str.data(), (char * const *)argscc, (char * const *)envcc) < 0) {
-			piCoutObj << "\"execve" << str << args << "\" error :" << errorString();
-		}
+		PRIVATE->closePipe(StdIn, PipeWrite);
+		PRIVATE->closePipe(StdOut, PipeRead);
+		PRIVATE->closePipe(StdErr, PipeRead);
+
+		if (PRIVATE->grab[StdIn]) dup2(PRIVATE->pipes[StdIn][PipeRead], STDIN_FILENO);
+		if (PRIVATE->grab[StdOut]) dup2(PRIVATE->pipes[StdOut][PipeWrite], STDOUT_FILENO);
+		if (PRIVATE->grab[StdErr]) dup2(PRIVATE->pipes[StdErr][PipeWrite], STDERR_FILENO);
+
+		PRIVATE->closePipe(StdIn, PipeRead);
+		PRIVATE->closePipe(StdOut, PipeWrite);
+		PRIVATE->closePipe(StdErr, PipeWrite);
+
+		execve(str.data(), largs, lenv);
+		// normaly execve can't return, if it returns - error occured
+		piCoutObj << "\"execve" << str << args << "\" error :" << errorString();
+		exit(127);
 	} else {
-		piMinSleep();
-		// cout << "wait" << endl;
+		PRIVATE->closePipe(StdIn, PipeRead);
+		PRIVATE->closePipe(StdOut, PipeWrite);
+		PRIVATE->closePipe(StdErr, PipeWrite);
+
+		if (PRIVATE->grab[StdOut]) fcntl(PRIVATE->pipes[StdOut][PipeRead], F_SETFL, O_NONBLOCK);
+		if (PRIVATE->grab[StdErr]) fcntl(PRIVATE->pipes[StdErr][PipeRead], F_SETFL, O_NONBLOCK);
+
+		exec_start = true;
 		if (!detached) {
 			waitpid(pid_, &exit_code, 0);
-			pid_ = 0;
+			if (WIFEXITED(exit_code)) {
+				exec_finished = WEXITSTATUS(exit_code) != 127;
+			}
+			pid_          = 0;
 			if (!detached) PRIVATE->pid = pid_;
-			// cout << "wait done" << endl;
 		}
 	}
+	delete[] largs;
+	delete[] lenv;
 #  endif
 	if (!detached) execFinished(str, exit_code);
-	is_exec = false;
-#  ifdef WINDOWS
-	delete[] a;
-#  endif
-}
-
-PIByteArray PIProcess::readFile(PIFile & f, bool clear)
-{
-	f.open(PIIODevice::ReadOnly);
-	const auto ret = f.readAll();
-	if (clear) {
-		f.clear();
-	}
-	return ret;
+	exec_start = false;
 }
 
 
 void PIProcess::terminate() {
 #  ifdef WINDOWS
-	if (is_exec)
+	if (exec_start) {
 		if (!TerminateProcess(PRIVATE->pi.hProcess, 0)) return;
+	}
 	PRIVATE->pi.dwProcessId = 0;
 #  else
-	if (is_exec) kill(PRIVATE->pid, SIGKILL);
+	if (exec_start) kill(PRIVATE->pid, SIGKILL);
 	PRIVATE->pid = 0;
 #  endif
 }
 
 
-bool PIProcess::waitForFinish() {
-	return PIThread::waitForFinish(1_m);
-}
-
-
 void PIProcess::execIndependent(const PIString & program, const PIStringList & args_) {
 	PIProcess p;
 	p.args << program << args_;
@@ -266,12 +394,45 @@ int PIProcess::pID() const {
 #  endif
 }
 
-PIByteArray PIProcess::readOutput(bool clear) {
-	return readFile(f_out, clear);
+
+PIByteArray PIProcess::readOutput() {
+	return PRIVATE->readPipe(StdOut);
 }
 
-PIByteArray PIProcess::readError(bool clear) {
-	return readFile(f_err, clear);
+
+PIByteArray PIProcess::readError() {
+	return PRIVATE->readPipe(StdErr);
+}
+
+
+bool PIProcess::writeInput(const PIByteArray & data) {
+	if (PRIVATE->grab[StdIn]) return PRIVATE->writePipe(data);
+	return false;
+}
+
+
+void PIProcess::closeInput() {
+	if (PRIVATE->grab[StdIn]) {
+#  ifdef WINDOWS
+		PRIVATE->writePipe({0x1A});
+#  endif
+		PRIVATE->closePipe(StdIn, PipeWrite);
+	}
+}
+
+
+void PIProcess::enableWriteStdIn(bool on) {
+	PRIVATE->grab[StdIn] = on;
+}
+
+
+void PIProcess::enableReadStdOut(bool on) {
+	PRIVATE->grab[StdOut] = on;
+}
+
+
+void PIProcess::enableReadStdErr(bool on) {
+	PRIVATE->grab[StdErr] = on;
 }
 
 
diff --git a/libs/main/system/piprocess.h b/libs/main/system/piprocess.h
index 419776ee..e5841a64 100644
--- a/libs/main/system/piprocess.h
+++ b/libs/main/system/piprocess.h
@@ -9,18 +9,18 @@
     Process
     Ivan Pelipenko peri4ko@yandex.ru
 
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Lesser General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU Lesser General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Lesser General Public License for more details.
 
-    You should have received a copy of the GNU Lesser General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef PIPROCESS_H
@@ -28,14 +28,45 @@
 
 #ifndef MICRO_PIP
 
-#  include "pifile.h"
 #  include "pithread.h"
 
-
+//! \class PIProcess
 //! \ingroup System
-//! \~\brief
-//! \~english External process.
-//! \~russian Внешний процесс.
+//! \~english
+//! \brief Class for managing external processes
+//! \details
+//! The PIProcess class provides functionality to create, control and interact with external processes.
+//! It allows both attached execution (with full control over input/output streams) and detached execution.
+//!
+//! Key features:
+//! - Start processes with arguments and environment variables
+//! - Monitor process state (running/finished)
+//! - Read from stdout/stderr streams
+//! - Write to stdin stream
+//! - Set custom working directory
+//! - Modify environment variables
+//! - Wait for process completion
+//! - Terminate processes
+//! - Retrieve exit codes and process IDs
+//!
+//! This class inherits from PIThread and provides event-based notifications for process lifecycle events.
+//! \~russian
+//! \brief Класс для управления внешними процессами
+//! \details
+//! Класс PIProcess предоставляет функциональность для создания, управления и взаимодействия с внешними процессами.
+//! Поддерживает как присоединенное выполнение (с полным контролем потоков ввода/вывода), так и независимое выполнение.
+//!
+//! Основные возможности:
+//! - Запуск процессов с аргументами и переменными окружения
+//! - Мониторинг состояния процесса (запущен/завершен)
+//! - Чтение из потоков stdout/stderr
+//! - Запись в поток stdin
+//! - Установка рабочей директории
+//! - Изменение переменных окружения
+//! - Ожидание завершения процесса
+//! - Завершение процессов
+//! - Получение кодов завершения и идентификаторов процессов
+//!
 class PIP_EXPORT PIProcess: public PIThread {
 	PIOBJECT_SUBCLASS(PIProcess, PIThread);
 
@@ -55,74 +86,64 @@ public:
 	//! \~russian Возвращает ID процесса текущего выполнения
 	int pID() const;
 
-	void setGrabInput(bool yes) { g_in = yes; }
-
-	//! \~english Set attached execution grab output stream enabled
-	//! \~russian
-	void setGrabOutput(bool yes) { g_out = yes; }
-
-	//! \~english Set attached execution grab error stream enabled
-	//! \~russian
-	void setGrabError(bool yes) { g_err = yes; }
-
-	void setInputFile(const PIString & path) { f_in.setPath(path); }
-
-	//! \~english Set attached execution grab output stream file
-	//! \~russian
-	void setOutputFile(const PIString & path) { f_out.setPath(path); }
-
-	//! \~english Set attached execution grab error stream file
-	//! \~russian
-	void setErrorFile(const PIString & path) { f_err.setPath(path); }
-
-	void unsetInputFile() { f_in.setPath(""); }
-
-	//! \~english Reset attached execution grab output stream file
-	//! \~russian
-	void unsetOutputFile() { f_out.setPath(""); }
-
-	//! \~english Reset attached execution grab error stream file
-	//! \~russian
-	void unsetErrorFile() { f_err.setPath(""); }
-
 	//! \~english Returns current attached execution working directory or empty string if it wasn`t set
-	//! \~russian
+	//! \~russian Возвращает рабочую директорию выполнения или пустую строку, если не установлена
 	PIString workingDirectory() const { return wd; }
 
 	//! \~english Set attached execution working directory
-	//! \~russian
+	//! \~russian Устанавливает рабочую директорию для выполнения
 	void setWorkingDirectory(const PIString & path) { wd = path; }
 
 	//! \~english Rseet attached execution working directory, application working dir will be used
-	//! \~russian
+	//! \~russian Сбрасывает рабочую директорию, будет использоваться директория приложения
 	void resetWorkingDirectory() { wd.clear(); }
 
 	//! \~english Returns all attached execution output stream
-	//! \~russian
-	PIByteArray readOutput(bool clear = false);
+	//! \~russian Возвращает весь вывод из стандартного потока вывода (stdout)
+	PIByteArray readOutput();
 
 	//! \~english Returns all attached execution error stream
-	//! \~russian
-	PIByteArray readError(bool clear = false);
+	//! \~russian Возвращает весь вывод из потока ошибок (stderr)
+	PIByteArray readError();
+
+	//! \~english Write data to attached execution input stream
+	//! \~russian Записывает данные в стандартный поток ввода (stdin)
+	bool writeInput(const PIByteArray & data);
+
+	//! \~english Close attached execution input stream and send EOF
+	//! \~russian Закрывает поток ввода (stdin) и отправляет EOF
+	void closeInput();
+
+	//! \~english Enable or disable writing to process stdin
+	//! \~russian Включает или отключает запись в стандартный поток ввода (stdin) процесса
+	void enableWriteStdIn(bool on = true);
+
+	//! \~english Enable or disable reading from process stdout
+	//! \~russian Включает или отключает чтение из стандартного потока вывода (stdout) процесса
+	void enableReadStdOut(bool on = true);
+
+	//! \~english Enable or disable reading from process stderr
+	//! \~russian Включает или отключает чтение из потока ошибок (stderr) процесса
+	void enableReadStdErr(bool on = true);
 
 	//! \~english Returns current attached execution environment
-	//! \~russian
+	//! \~russian Возвращает текущее окружение выполнения
 	PIStringList environment() { return env; }
 
 	//! \~english Clear current attached execution environment. Call before \a exec()
-	//! \~russian
+	//! \~russian Очищает окружение выполнения. Вызывать перед \a exec()
 	void clearEnvironment() { env.clear(); }
 
 	//! \~english Remove variable "variable" from current attached execution environment. Call before \a exec()
-	//! \~russian
+	//! \~russian Удаляет переменную "variable" из окружения выполнения. Вызывать перед \a exec()
 	void removeEnvironmentVariable(const PIString & variable);
 
 	//! \~english Set variable "variable" to "value" in current attached execution environment. Call before \a exec()
-	//! \~russian
+	//! \~russian Устанавливает значение "value" для переменной "variable" в окружении выполнения. Вызывать перед \a exec()
 	void setEnvironmentVariable(const PIString & variable, const PIString & value);
 
 	//! \~english Start attached execution "program" with one argument "arg"
-	//! \~russian
+	//! \~russian Запускает выполнение "program" с одним аргументом "arg"
 	void exec(const PIString & program, const PIString & arg) {
 		args.clear();
 		args << program << arg;
@@ -140,36 +161,43 @@ public:
 		exec_();
 	}
 	EVENT_HANDLER(void, terminate);
-	EVENT_HANDLER(bool, waitForFinish);
+	EVENT_HANDLER(bool, waitForFinish) { return PIThread::waitForFinish(); }
 	EVENT_HANDLER1(bool, waitForFinish, PISystemTime, timeout) { return PIThread::waitForFinish(timeout); }
 
 	EVENT1(execStarted, PIString, program);
 	EVENT2(execFinished, PIString, program, int, exit_code);
 
+	//! \~english Check if attached execution has finished
+	//! \~russian Проверяет, завершилось ли выполнение процесса
+	bool isExecFinished() const { return exec_finished; }
+
+	//! \~english Check if attached execution has started
+	//! \~russian Проверяет, запущен ли процесс выполнения
+	bool isExecStarted() const { return exec_start; }
 
 	//! \~english Start detached execution "program" without arguments
-	//! \~russian
+	//! \~russian Запускает независимое выполнение "program" без аргументов
 	static void execIndependent(const PIString & program) { execIndependent(program, PIStringList()); }
 
 	//! \~english Start detached execution "program" with one argument "arg"
-	//! \~russian
+	//! \~russian Запускает независимое выполнение "program" с одним аргументом "arg"
 	static void execIndependent(const PIString & program, const PIString & arg) { execIndependent(program, PIStringList() << arg); }
 
 	//! \~english Start detached execution "program" with arguments "args"
-	//! \~russian
+	//! \~russian Запускает независимое выполнение "program" с аргументами "args"
 	static void execIndependent(const PIString & program, const PIStringList & args);
 
 
 	//! \~english Returns application environment
-	//! \~russian
+	//! \~russian Возвращает окружение текущего приложения
 	static PIStringList currentEnvironment();
 
 	//! \~english Returns application process ID
-	//! \~russian
+	//! \~russian Возвращает ID процесса текущего приложения
 	static int currentPID();
 
 	//! \~english Returns variable "variable" value from application environment
-	//! \~russian
+	//! \~russian Возвращает значение переменной "variable" из окружения приложения
 	static PIString getEnvironmentVariable(const PIString & variable);
 
 	//! \handlers
@@ -178,27 +206,27 @@ public:
 	//! \fn void exec(const PIString & program)
 	//! \brief
 	//! \~english Start attached execution "program" without arguments
-	//! \~russian
+	//! \~russian Запускает выполнение "program" без аргументов
 
 	//! \fn void exec(const PIString & program, const PIStringList & args)
 	//! \brief
 	//! \~english Start attached execution "program" with arguments "args"
-	//! \~russian
+	//! \~russian Запускает выполнение "program" с аргументами "args"
 
 	//! \fn void terminate()
 	//! \brief
 	//! \~english Immediately terminate attached execution
-	//! \~russian
+	//! \~russian Немедленно завершает выполнение
 
 	//! \fn bool waitForFinish()
 	//! \brief
 	//! \~english Wait for attached execution finish maximum for 60 seconds
-	//! \~russian
+	//! \~russian Ожидает завершения выполнения (максимум 60 секунд)
 
 	//! \fn bool waitForFinish(PISystemTime timeout)
 	//! \brief
 	//! \~english Wait for attached execution finish maximum for "timeout_"
-	//! \~russian
+	//! \~russian Ожидает завершения выполнения в течение "timeout_"
 
 	//! \}
 	//! \events
@@ -207,12 +235,12 @@ public:
 	//! \fn void execStarted(PIString program)
 	//! \brief
 	//! \~english Raise on attached execution start
-	//! \~russian
+	//! \~russian Генерируется при запуске выполнения
 
 	//! \fn void execFinished(PIString program)
 	//! \brief
 	//! \~english Raise on attached execution finish
-	//! \~russian
+	//! \~russian Генерируется при завершении выполнения
 
 	//! \}
 
@@ -220,16 +248,14 @@ private:
 	void run() override;
 	void exec_();
 	void startProc(bool detached);
-	PIByteArray readFile(PIFile & f, bool clear);
 
+private:
 	PRIVATE_DECLARATION(PIP_EXPORT)
 	PIStringList args, env;
 	PIString wd;
-	PIByteArray out;
-	PIFile f_in, f_out, f_err;
-	bool g_in, g_out, g_err, t_in, t_out, t_err;
 	int exit_code;
-	bool is_exec;
+	std::atomic_bool exec_start;
+	std::atomic_bool exec_finished;
 };
 
 #endif // MICRO_PIP
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c5dae9c3..a5ba75e2 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -36,3 +36,4 @@ pip_test(core)
 pip_test(piobject)
 pip_test(client_server pip_client_server)
 pip_test(io)
+pip_test(system)
diff --git a/tests/system/process_test.cpp b/tests/system/process_test.cpp
new file mode 100644
index 00000000..3a04b53d
--- /dev/null
+++ b/tests/system/process_test.cpp
@@ -0,0 +1,98 @@
+#include "piprocess.h"
+#include "pitime.h"
+
+#include "gtest/gtest.h"
+
+
+class ProcessTest: public ::testing::Test {
+protected:
+	PIProcess launcher;
+	const PIString command =
+#ifdef _WIN32
+		"C:/Windows/System32/cmd.exe";
+#else
+		"/bin/sh";
+#endif
+
+	void SetUp() override {
+		launcher.enableWriteStdIn(false);
+		launcher.enableReadStdOut();
+		launcher.enableReadStdErr();
+	}
+
+	void TearDown() override {
+		if (launcher.isRunning()) {
+			launcher.waitForFinish();
+		}
+	}
+};
+
+
+TEST_F(ProcessTest, Output) {
+#ifdef _WIN32
+	const PIStringList args = {"/c", "echo Hello from stdout && echo Hello from stderr 1>&2"};
+#else
+	const PIStringList args = {"-c", "echo Hello from stdout; echo Hello from stderr 1>&2"};
+#endif
+
+	launcher.exec(command, args);
+	ASSERT_TRUE(launcher.isRunning());
+
+	ASSERT_TRUE(launcher.waitForFinish());
+	ASSERT_TRUE(launcher.isExecFinished());
+
+	const auto out = PIString::fromAscii(launcher.readOutput());
+	const auto err = PIString::fromAscii(launcher.readError());
+
+	EXPECT_TRUE(out.contains("Hello from stdout"));
+	EXPECT_TRUE(err.contains("Hello from stderr"));
+
+	const int exit_code = launcher.exitCode();
+	EXPECT_FALSE(launcher.isRunning());
+
+#ifdef _WIN32
+	EXPECT_EQ(exit_code, 0);
+#else
+	EXPECT_TRUE(WIFEXITED(exit_code));
+	EXPECT_EQ(WEXITSTATUS(exit_code), 0);
+#endif
+}
+
+
+TEST_F(ProcessTest, Input) {
+#ifdef _WIN32
+	const PIStringList args = {"/c", "more"};
+#else
+	const PIStringList args = {"-c", "read input; echo $input"};
+#endif
+
+	launcher.enableWriteStdIn();
+	launcher.exec(command, args);
+	ASSERT_TRUE(launcher.isRunning());
+	piMSleep(100);
+	EXPECT_TRUE(launcher.isExecStarted());
+	EXPECT_TRUE(!launcher.isExecFinished());
+
+	PIString test_input = "Test input string\n";
+	EXPECT_TRUE(launcher.writeInput(test_input.toAscii()));
+	launcher.closeInput();
+
+	ASSERT_TRUE(launcher.waitForFinish());
+	EXPECT_TRUE(launcher.isExecFinished());
+
+	const auto out = PIString::fromAscii(launcher.readOutput());
+	EXPECT_TRUE(out.contains("Test input string"));
+}
+
+
+TEST_F(ProcessTest, NonexistentCommand) {
+	const PIString command = {"nonexistent_command_12345"};
+
+	launcher.enableWriteStdIn(false);
+	launcher.enableReadStdOut(false);
+	launcher.enableReadStdErr(false);
+	launcher.exec(command);
+	ASSERT_TRUE(launcher.isRunning());
+	ASSERT_TRUE(launcher.waitForFinish());
+	EXPECT_FALSE(launcher.isExecFinished());
+}
diff --git a/utils/system_calib/CMakeLists.txt b/utils/system_calib/CMakeLists.txt
new file mode 100755
index 00000000..1cc42fce
--- /dev/null
+++ b/utils/system_calib/CMakeLists.txt
@@ -0,0 +1,7 @@
+list(APPEND PIP_UTILS_LIST "pip_system_calib")
+set(PIP_UTILS_LIST ${PIP_UTILS_LIST} PARENT_SCOPE)
+add_executable(pip_system_calib "main.cpp")
+target_link_libraries(pip_system_calib pip)
+if (DEFINED LIB)
+	install(TARGETS pip_system_calib DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
+endif ()
diff --git a/utils/system_test/main.cpp b/utils/system_calib/main.cpp
similarity index 100%
rename from utils/system_test/main.cpp
rename to utils/system_calib/main.cpp
diff --git a/utils/system_test/CMakeLists.txt b/utils/system_test/CMakeLists.txt
deleted file mode 100755
index e93f6be7..00000000
--- a/utils/system_test/CMakeLists.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-list(APPEND PIP_UTILS_LIST "pip_system_test")
-set(PIP_UTILS_LIST ${PIP_UTILS_LIST} PARENT_SCOPE)
-add_executable(pip_system_test "main.cpp")
-target_link_libraries(pip_system_test pip)
-if (DEFINED LIB)
-	install(TARGETS pip_system_test DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
-endif ()