| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart.io; |
| |
| // TODO(ager): The only reason for this class is that we |
| // cannot patch a top-level at this point. |
| class _ProcessUtils { |
| external static _exit(int status); |
| external static _setExitCode(int status); |
| external static _sleep(int millis); |
| } |
| |
| /** |
| * Exit the Dart VM process immediately with the given [status] code. |
| * |
| * This does not wait for any asynchronous operations to terminate. Using |
| * [exit] is therefore very likely to lose data. |
| */ |
| void exit(int status) { |
| if (status is !int) { |
| throw new ArgumentError("exit: int status expected"); |
| } |
| _ProcessUtils._exit(status); |
| } |
| |
| /** |
| * Global exit code for the Dart VM. |
| * |
| * The exit code is global for the Dart VM and the last assignment to |
| * exitCode from any isolate determines the exit code of the Dart VM |
| * on normal termination. |
| */ |
| set exitCode(int status) { |
| if (status is !int) { |
| throw new ArgumentError("setExitCode: int status expected"); |
| } |
| _ProcessUtils._setExitCode(status); |
| } |
| |
| /** |
| * Sleep for the duration specified in [duration]. |
| * |
| * Use this with care, as no asynchronous operations can be processed |
| * in a isolate while it is blocked in a [sleep] call. |
| */ |
| void sleep(Duration duration) { |
| int milliseconds = duration.inMilliseconds; |
| if (milliseconds < 0) { |
| throw new ArgumentError("sleep: duration cannot be negative"); |
| } |
| _ProcessUtils._sleep(milliseconds); |
| } |
| |
| /** |
| * [Process] is used to start new processes using the static |
| * [start] and [run] methods. |
| */ |
| abstract class Process { |
| /** |
| * Starts a process running the [executable] with the specified |
| * [arguments]. Returns a [:Future<Process>:] that completes with a |
| * Process instance when the process has been successfully |
| * started. That [Process] object can be used to interact with the |
| * process. If the process cannot be started the returned [Future] |
| * completes with an exception. |
| * |
| * An optional [ProcessOptions] object can be passed to specify |
| * options other than the executable and the arguments. |
| * |
| * Users must read all data coming on the [stdout] and [stderr] |
| * streams of processes started with [:Process.start:]. If the user |
| * does not read all data on the streams the underlying system |
| * resources will not be freed since there is still pending data. |
| */ |
| external static Future<Process> start(String executable, |
| List<String> arguments, |
| [ProcessOptions options]); |
| |
| /** |
| * Starts a process and runs it non-interactively to completion. The |
| * process run is [executable] with the specified [arguments]. |
| * |
| * An optional [ProcessOptions] object can be passed to specify |
| * options other than the executable and the arguments. |
| * |
| * Returns a [:Future<ProcessResult>:] that completes with the |
| * result of running the process, i.e., exit code, standard out and |
| * standard in. |
| */ |
| external static Future<ProcessResult> run(String executable, |
| List<String> arguments, |
| [ProcessOptions options]); |
| |
| /** |
| * Returns the standard output stream of the process as a [:Stream:]. |
| * |
| * Throws an [UnsupportedError] if the process is |
| * non-interactive. |
| */ |
| Stream<List<int>> get stdout; |
| |
| /** |
| * Returns the standard error stream of the process as a [:Stream:]. |
| * |
| * Throws an [UnsupportedError] if the process is |
| * non-interactive. |
| */ |
| Stream<List<int>> get stderr; |
| |
| /** |
| * Returns the standard input stream of the process as an [IOSink]. |
| * |
| * Throws an [UnsupportedError] if the process is |
| * non-interactive. |
| */ |
| IOSink get stdin; |
| |
| /** |
| * Returns a [:Future:] which completes with the exit code of the process |
| * when the process completes. |
| * |
| * Throws an [UnsupportedError] if the process is |
| * non-interactive. |
| */ |
| Future<int> exitCode; |
| |
| /** |
| * On Windows, [kill] kills the process, ignoring the [signal] |
| * flag. On Posix systems, [kill] sends [signal] to the |
| * process. Depending on the signal giving, it'll have different |
| * meanings. When the process terminates as a result of calling |
| * [kill] [onExit] is called. |
| * |
| * Returns [:true:] if the process is successfully killed (the |
| * signal is successfully sent). Returns [:false:] if the process |
| * could not be killed (the signal could not be sent). Usually, |
| * a [:false:] return value from kill means that the process is |
| * already dead. |
| */ |
| bool kill([ProcessSignal signal = ProcessSignal.SIGTERM]); |
| } |
| |
| |
| /** |
| * [ProcessResult] represents the result of running a non-interactive |
| * process started with [:Process.run:]. |
| */ |
| abstract class ProcessResult { |
| /** |
| * Exit code for the process. |
| */ |
| int get exitCode; |
| |
| /** |
| * Standard output from the process as a string. |
| */ |
| String get stdout; |
| |
| /** |
| * Standard error from the process as a string. |
| */ |
| String get stderr; |
| } |
| |
| |
| /** |
| * [ProcessOptions] represents the options that can be supplied when |
| * starting a process. |
| */ |
| class ProcessOptions { |
| /** |
| * The working directory from which the process is started. Note |
| * that the change of directory occurs before executing the process |
| * on some platforms, which may have impact when using relative |
| * paths for the executable and the arguments. |
| */ |
| String workingDirectory; |
| |
| /** |
| * The encoding used for text on stdout when starting a |
| * non-interactive process with [:Process.run:]. |
| * |
| * This option is ignored for interactive processes started with |
| * [:Process.start:]. |
| * |
| * The default stdoutEncoding is SYSTEM. |
| */ |
| Encoding stdoutEncoding; |
| |
| /** |
| * The encoding used for text on stderr when starting a |
| * non-interactive process with [:Process.run:]. |
| * |
| * This option is ignored for interactive processes started with |
| * [:Process.start:]. |
| * |
| * The default stderrEncoding is SYSTEM. |
| */ |
| Encoding stderrEncoding; |
| |
| /** |
| * Provides the environment variables for the process. If not set |
| * the environment of the parent process is inherited. |
| * |
| * Currently, only ASCII environment variables are supported and |
| * errors are likely to occur if an environment variables with |
| * code-points outside the ASCII range is passed in. |
| */ |
| Map<String, String> environment; |
| } |
| |
| /** |
| * On Posix systems, [ProcessSignal] is used to send a specific signal |
| * to a child process, see [:Process.kill:]. |
| */ |
| class ProcessSignal { |
| static const ProcessSignal SIGHUP = const ProcessSignal._signal(1); |
| static const ProcessSignal SIGINT = const ProcessSignal._signal(2); |
| static const ProcessSignal SIGQUIT = const ProcessSignal._signal(3); |
| static const ProcessSignal SIGILL = const ProcessSignal._signal(4); |
| static const ProcessSignal SIGTRAP = const ProcessSignal._signal(5); |
| static const ProcessSignal SIGABRT = const ProcessSignal._signal(6); |
| static const ProcessSignal SIGBUS = const ProcessSignal._signal(7); |
| static const ProcessSignal SIGFPE = const ProcessSignal._signal(8); |
| static const ProcessSignal SIGKILL = const ProcessSignal._signal(9); |
| static const ProcessSignal SIGUSR1 = const ProcessSignal._signal(10); |
| static const ProcessSignal SIGSEGV = const ProcessSignal._signal(11); |
| static const ProcessSignal SIGUSR2 = const ProcessSignal._signal(12); |
| static const ProcessSignal SIGPIPE = const ProcessSignal._signal(13); |
| static const ProcessSignal SIGALRM = const ProcessSignal._signal(14); |
| static const ProcessSignal SIGTERM = const ProcessSignal._signal(15); |
| static const ProcessSignal SIGCHLD = const ProcessSignal._signal(17); |
| static const ProcessSignal SIGCONT = const ProcessSignal._signal(18); |
| static const ProcessSignal SIGSTOP = const ProcessSignal._signal(19); |
| static const ProcessSignal SIGTSTP = const ProcessSignal._signal(20); |
| static const ProcessSignal SIGTTIN = const ProcessSignal._signal(21); |
| static const ProcessSignal SIGTTOU = const ProcessSignal._signal(22); |
| static const ProcessSignal SIGURG = const ProcessSignal._signal(23); |
| static const ProcessSignal SIGXCPU = const ProcessSignal._signal(24); |
| static const ProcessSignal SIGXFSZ = const ProcessSignal._signal(25); |
| static const ProcessSignal SIGVTALRM = const ProcessSignal._signal(26); |
| static const ProcessSignal SIGPROF = const ProcessSignal._signal(27); |
| static const ProcessSignal SIGPOLL = const ProcessSignal._signal(29); |
| static const ProcessSignal SIGSYS = const ProcessSignal._signal(31); |
| |
| const ProcessSignal._signal(int this._signalNumber); |
| final int _signalNumber; |
| } |
| |
| |
| class ProcessException implements Exception { |
| const ProcessException(String this.executable, |
| List<String> this.arguments, |
| [String this.message = "", |
| int this.errorCode = 0]); |
| String toString() { |
| var msg = (message == null) ? 'OS error code: $errorCode' : message; |
| var args = arguments.join(' '); |
| return "ProcessException: $msg\n Command: $executable $args"; |
| } |
| |
| /** |
| * Contains the executable provided for the process. |
| */ |
| final String executable; |
| |
| /** |
| * Contains the arguments provided for the process. |
| */ |
| final List<String> arguments; |
| |
| /** |
| * Contains the system message for the process exception if any. |
| */ |
| final String message; |
| |
| /** |
| * Contains the OS error code for the process exception if any. |
| */ |
| final int errorCode; |
| } |