Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / __ConsoleStream.cs / 1 / __ConsoleStream.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: ConsoleStream ** ** ** Purpose: Exposes a separate Stream for Console IO and ** handles WinCE appropriately. Also keeps us from using the ** ThreadPool for all Console output. ** ** ===========================================================*/ using System; using System.Runtime.InteropServices; using System.Security; using Microsoft.Win32; using Microsoft.Win32.SafeHandles; using System.Runtime.CompilerServices; using System.Runtime.Versioning; namespace System.IO { internal sealed class __ConsoleStream : Stream { internal const int DefaultBufferSize = 128; // From winerror.h private const int ERROR_BROKEN_PIPE = 109; // ERROR_NO_DATA ("The pipe is being closed") is returned when we write to // a console that is closing. private const int ERROR_NO_DATA = 232; private SafeFileHandle _handle; private bool _canRead; private bool _canWrite; [ResourceExposure(ResourceScope.Process)] internal __ConsoleStream(SafeFileHandle handle, FileAccess access) { BCLDebug.Assert(handle != null && !handle.IsInvalid, "__ConsoleStream expects a valid handle!"); _handle = handle; _canRead = access == FileAccess.Read; _canWrite = access == FileAccess.Write; } public override bool CanRead { get { return _canRead; } } public override bool CanWrite { get { return _canWrite; } } public override bool CanSeek { get { return false; } } public override long Length { get { __Error.SeekNotSupported(); return 0; // compiler appeasement } } public override long Position { get { __Error.SeekNotSupported(); return 0; // compiler appeasement } set { __Error.SeekNotSupported(); } } protected override void Dispose(bool disposing) { // We're probably better off not closing the OS handle here. First, // we allow a program to get multiple instances of __ConsoleStreams // around the same OS handle, so closing one handle would invalidate // them all. Additionally, we want a second AppDomain to be able to // write to stdout if a second AppDomain quits. if (_handle != null) { _handle = null; } _canRead = false; _canWrite = false; base.Dispose(disposing); } public override void Flush() { if (_handle == null) __Error.FileNotOpen(); if (!CanWrite) __Error.WriteNotSupported(); } public override void SetLength(long value) { __Error.SeekNotSupported(); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] public override int Read([In, Out] byte[] buffer, int offset, int count) { if (buffer==null) throw new ArgumentNullException("buffer"); if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException((offset < 0 ? "offset" : "count"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - offset < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (!_canRead) __Error.ReadNotSupported(); int errorCode = 0; int result = ReadFileNative(_handle, buffer, offset, count, 0, out errorCode); if (result == -1) { __Error.WinIOError(errorCode, String.Empty); } return result; } public override long Seek(long offset, SeekOrigin origin) { __Error.SeekNotSupported(); return 0; // compiler appeasement } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] public override void Write(byte[] buffer, int offset, int count) { if (buffer==null) throw new ArgumentNullException("buffer"); if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException((offset < 0 ? "offset" : "count"), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - offset < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (!_canWrite) __Error.WriteNotSupported(); int errorCode = 0; int result = WriteFileNative(_handle, buffer, offset, count, 0, out errorCode); if (result == -1) { //BCLDebug.ConsoleError("__ConsoleStream::Write: throwing on error. Error code: "+errorCode+" 0x"+errorCode.ToString("x")+" handle: "+_handle.ToString()); __Error.WinIOError(errorCode, String.Empty); } return; } // P/Invoke wrappers for writing to and from a file, nearly identical // to the ones on FileStream. These are duplicated to save startup/hello // world working set. [ResourceExposure(ResourceScope.Process)] [ResourceConsumption(ResourceScope.Process)] private unsafe static int ReadFileNative(SafeFileHandle hFile, byte[] bytes, int offset, int count, int mustBeZero, out int errorCode) { BCLDebug.Assert(offset >= 0, "offset >= 0"); BCLDebug.Assert(count >= 0, "count >= 0"); BCLDebug.Assert(bytes != null, "bytes != null"); // Don't corrupt memory when multiple threads are erroneously writing // to this stream simultaneously. if (bytes.Length - offset < count) throw new IndexOutOfRangeException(Environment.GetResourceString("IndexOutOfRange_IORaceCondition")); // You can't use the fixed statement on an array of length 0. if (bytes.Length==0) { errorCode = 0; return 0; } int r; int numBytesRead; fixed(byte* p = bytes) { r = ReadFile(hFile, p + offset, count, out numBytesRead, Win32Native.NULL); } if (r==0) { errorCode = Marshal.GetLastWin32Error(); if (errorCode == ERROR_BROKEN_PIPE) { // A pipe into stdin was closed. Not an error, but EOF. return 0; } return -1; } else errorCode = 0; return numBytesRead; } [ResourceExposure(ResourceScope.Process)] [ResourceConsumption(ResourceScope.Process)] private static unsafe int WriteFileNative(SafeFileHandle hFile, byte[] bytes, int offset, int count, int mustBeZero, out int errorCode) { BCLDebug.Assert(offset >= 0, "offset >= 0"); BCLDebug.Assert(count >= 0, "count >= 0"); BCLDebug.Assert(bytes != null, "bytes != null"); BCLDebug.Assert(bytes.Length >= offset + count, "bytes.Length >= offset + count"); // You can't use the fixed statement on an array of length 0. if (bytes.Length==0) { errorCode = 0; return 0; } int numBytesWritten = 0; int r; fixed(byte* p = bytes) { r = WriteFile(hFile, p + offset, count, out numBytesWritten, Win32Native.NULL); } if (r==0) { errorCode = Marshal.GetLastWin32Error(); // For pipes that are closing or broken, just stop. if (errorCode==ERROR_NO_DATA || errorCode==ERROR_BROKEN_PIPE) return 0; return -1; } else { errorCode = 0; } return numBytesWritten; } // The P/Invoke declarations for ReadFile and WriteFile are here for a reason! This prevents us from loading several classes // in the trivial hello world case. [DllImport(Win32Native.KERNEL32, SetLastError=true), SuppressUnmanagedCodeSecurityAttribute] [ResourceExposure(ResourceScope.Process)] unsafe private static extern int ReadFile(SafeFileHandle handle, byte* bytes, int numBytesToRead, out int numBytesRead, IntPtr mustBeZero); [DllImport(Win32Native.KERNEL32, SetLastError=true), SuppressUnmanagedCodeSecurityAttribute] [ResourceExposure(ResourceScope.Process)] internal static unsafe extern int WriteFile(SafeFileHandle handle, byte* bytes, int numBytesToWrite, out int numBytesWritten, IntPtr mustBeZero); } }
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