Send Ctrl+C to launched process before killing it on Windows #49847
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Thanks for your PR, @@tmat. |
This was referenced Jul 18, 2025
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Pull Request Overview
This PR implements graceful termination of dotnet-watch processes on Windows by enabling Ctrl+C signal handling. The primary goal is to allow Windows processes launched by dotnet-watch to receive and handle Ctrl+C events properly before being forcefully terminated.
Key changes:
- Added Windows-specific Ctrl+C event handling using Windows API calls
- Modified process creation to use CREATE_NEW_PROCESS_GROUP flag for user applications on Windows
- Updated timeout values to allow graceful shutdown instead of immediate termination
Reviewed Changes
Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
src/BuiltInTools/dotnet-watch/Utilities/ProcessUtilities.cs |
New utility class with Windows API interop for Ctrl+C handling and signal management |
src/BuiltInTools/dotnet-watch/Process/ProcessRunner.cs |
Modified process termination logic to support graceful shutdown with Ctrl+C on Windows |
src/BuiltInTools/dotnet-watch/Process/ProcessSpec.cs |
Added IsUserApplication property to distinguish between user apps and helper processes |
test/dotnet-watch.Tests/TestUtilities/WatchableApp.cs |
Updated test utilities to enable Windows Ctrl+C handling and increased timeout values |
test/dotnet-watch.Tests/HotReload/ApplyDeltaTests.cs |
Added Windows-specific test for graceful termination and updated existing tests |
src/BuiltInTools/DotNetDeltaApplier/StartupHook.cs |
Extended signal handling to include Windows Ctrl+C support |
Comments suppressed due to low confidence (2)
src/BuiltInTools/dotnet-watch/Utilities/ProcessUtilities.cs:81
- The .NET version 'NET10_0_OR_GREATER' does not exist. Consider using a valid .NET version like 'NET8_0_OR_GREATER' or 'NET9_0_OR_GREATER'.
#if NET10_0_OR_GREATER
src/BuiltInTools/DotNetDeltaApplier/StartupHook.cs:91
- The .NET version 'NET10_0_OR_GREATER' does not exist. Consider using a valid .NET version like 'NET8_0_OR_GREATER' or 'NET9_0_OR_GREATER'.
#if NET10_0_OR_GREATER
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/azp run |
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Azure Pipelines successfully started running 1 pipeline(s). |
phil-allen-msft
approved these changes
Jul 30, 2025
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Use API added by dotnet/runtime#44944 to enable sending Ctrl+C to child processes on Windows.
Only uses this flag for application processes launched by dotnet-watch (not for auxiliary processes like
dotnet build).