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d8024ee02b
#rb Per.Larsson #rnx - The problem with the process set up is described properly in UE-208628, but the quick summary is that a lot of our code is creating a single pipe, then using the input as stdin and the output as stdout when launching a child process so if that process ever did read from stdin it would end up using it's own output. Then we are copy/pasting the same bug around the code base, - Fixed the problem by adding a second pipe to FProcessPipes. [CL 32465578 by paul chipchase in ue5-main branch]
78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "Containers/Array.h"
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#include "Containers/UnrealString.h"
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#include "HAL/PlatformProcess.h"
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#include "Logging/LogMacros.h"
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#include "UnrealVirtualizationTool.h"
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namespace UE::Virtualization
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{
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/** Wrapper around stdin and stdout pipes created by a call to FPlatformProcess::CreatePipe */
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struct FProcessPipes
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{
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FProcessPipes()
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{
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verify(FPlatformProcess::CreatePipe(StdOutReadPipe, StdOutWritePipe, false));
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verify(FPlatformProcess::CreatePipe(StdInReadPipe, StdInWritePipe, true));
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}
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~FProcessPipes()
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{
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FPlatformProcess::ClosePipe(StdOutReadPipe, StdOutWritePipe);
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FPlatformProcess::ClosePipe(StdInReadPipe, StdInWritePipe);
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}
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void ProcessStdOut()
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{
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check(GetStdOutForReading() != nullptr);
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FString Output = FPlatformProcess::ReadPipe(GetStdOutForReading());
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while (!Output.IsEmpty())
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{
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TArray<FString> Lines;
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Output.ParseIntoArray(Lines, LINE_TERMINATOR);
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for (const FString& Line : Lines)
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{
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UE_LOG(LogVirtualizationTool, Display, TEXT("Child Process-> %s"), *Line);
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}
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Output = FPlatformProcess::ReadPipe(GetStdOutForReading());
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}
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}
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void* GetStdInForProcess() const
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{
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return StdInReadPipe;
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}
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void* GetStdInForWriting() const
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{
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return StdInWritePipe;
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}
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void* GetStdOutForProcess() const
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{
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return StdOutWritePipe;
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}
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void* GetStdOutForReading() const
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{
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return StdOutReadPipe;
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}
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private:
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void* StdOutReadPipe = nullptr;
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void* StdOutWritePipe = nullptr;
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void* StdInReadPipe = nullptr;
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void* StdInWritePipe = nullptr;
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};
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} // namespace UE::Virtualization
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