diff --git a/Icod.Processes.csproj b/Icod.Processes.csproj index f4339e8..5a2c151 100644 --- a/Icod.Processes.csproj +++ b/Icod.Processes.csproj @@ -12,7 +12,7 @@ Icod.Processes Icod.Processes Debug;Release;Staging - 1.0.0 + 1.1.0 AnyCPU @@ -47,8 +47,8 @@ CS1591 - 1.0.0 - Initial standalone process execution and control release. + 1.1.0 + Adds atomic POSIX child file-descriptor duplication for wrapper commands while preserving the 1.0 execution and control contracts. Timothy J. Bruce Cross-platform .NET process execution and control primitives for safe child launching, process identity, signals, priorities, liveness, waiting, cancellation, and timeouts. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + +If the program does terminal interaction, make it output a short notice like +this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it under +certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands might +be different; for a GUI interface, you would use an "about box". + +You should also get your employer (if you work as a programmer) or school, if +any, to sign a "copyright disclaimer" for the program, if necessary. For more +information on this, and how to apply and follow the GNU GPL, see +. + +The GNU General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may consider +it more useful to permit linking proprietary applications with the library. If +this is what you want to do, use the GNU Lesser General Public License instead +of this License. But first, please read +. diff --git a/README.md b/README.md index 0961d3c..0de5216 100644 --- a/README.md +++ b/README.md @@ -30,7 +30,7 @@ originally incubated under `Icod.CommandFramework.Processes`. ## Requirements -The initial `1.0.0` release targets .NET 10.0. The implementation uses process +The current `1.1.0` release targets .NET 10.0. The implementation uses process launch capabilities provided by the .NET 10 runtime and intentionally does not add compatibility shims for older target frameworks. @@ -39,13 +39,13 @@ The only runtime package dependency is `Icod.Timing` 1.0.0. ## Installation ```text -Install-Package Icod.Processes -Version 1.0.0 +Install-Package Icod.Processes -Version 1.1.0 ``` or: ```text -dotnet add package Icod.Processes --version 1.0.0 +dotnet add package Icod.Processes --version 1.1.0 ``` ## Example @@ -79,6 +79,7 @@ operations explicitly rather than fabricating Unix semantics. | Process identity, PID-reuse observation, liveness, and waiting | Yes | Yes | Yes | | New process group at child launch | Yes | Yes | Yes | | Custom native `argv[0]` | Unsupported | Yes | Yes | +| Native child file-descriptor duplication | Unsupported | Yes | Yes | | Process-group target control | Unsupported | Yes | Yes | | Signal delivery | Termination substitution | Native | Native | | Signal disposition observation | Unsupported | Yes | Unsupported | @@ -97,7 +98,7 @@ can migrate without taking a dependency on ProcPs or CoreUtils. Replace the package dependency with: ```xml - + ``` and replace: diff --git a/src/PosixFileDescriptorDuplication.cs b/src/PosixFileDescriptorDuplication.cs new file mode 100644 index 0000000..aad80bd --- /dev/null +++ b/src/PosixFileDescriptorDuplication.cs @@ -0,0 +1,42 @@ +namespace Icod.Processes; + +/// +/// Describes one ordered POSIX child file-descriptor duplication applied atomically at spawn time. +/// +/// +/// The source descriptor is observed in the child launch context. When is +/// requested, the source is closed immediately after this duplication unless source and destination +/// are the same descriptor. Actions execute in list order, so a later action may duplicate a +/// destination established by an earlier action. +/// +public readonly record struct PosixFileDescriptorDuplication { + /// Gets the descriptor copied by dup2. + public int SourceDescriptor { get; } + + /// Gets the child descriptor replaced by dup2. + public int DestinationDescriptor { get; } + + /// Gets whether the source descriptor is closed in the child after duplication. + public bool CloseSource { get; } + + /// Initializes one ordered POSIX descriptor duplication. + public PosixFileDescriptorDuplication( + int sourceDescriptor, + int destinationDescriptor, + bool closeSource = false + ) { + if ( 0 > sourceDescriptor ) { + throw new ArgumentOutOfRangeException( + nameof( sourceDescriptor ) + ); + } + if ( 0 > destinationDescriptor ) { + throw new ArgumentOutOfRangeException( + nameof( destinationDescriptor ) + ); + } + this.SourceDescriptor = sourceDescriptor; + this.DestinationDescriptor = destinationDescriptor; + this.CloseSource = closeSource; + } +} diff --git a/src/PosixSpawnFileActionsScope.cs b/src/PosixSpawnFileActionsScope.cs new file mode 100644 index 0000000..35a1a70 --- /dev/null +++ b/src/PosixSpawnFileActionsScope.cs @@ -0,0 +1,88 @@ +namespace Icod.Processes; + +using System.Runtime.InteropServices; + +/// +/// Owns the opaque POSIX spawn file-actions object used for child-only descriptor duplication. +/// +internal sealed class PosixSpawnFileActionsScope : IDisposable { + // libc keeps posix_spawn_file_actions_t opaque. Reserve generous storage rather + // than duplicating a private glibc or Darwin structure layout in managed code. + private const int FileActionsStorageSize = 1024; + private bool _initialized; + + /// Gets the native file-actions pointer, or zero when no actions are requested. + internal IntPtr Pointer { + get; + private set; + } + + /// Creates ordered POSIX spawn file actions. + internal PosixSpawnFileActionsScope( + IList duplications + ) { + ArgumentNullException.ThrowIfNull( duplications ); + if ( 0 == duplications.Count ) { + return; + } + + this.Pointer = Marshal.AllocHGlobal( FileActionsStorageSize ); + try { + Marshal.Copy( + new byte[ FileActionsStorageSize ], + 0, + this.Pointer, + FileActionsStorageSize + ); + var result = ProcessNative.PosixSpawnFileActionsInit( this.Pointer ); + if ( 0 != result ) { + throw new InvalidOperationException( + $"posix_spawn_file_actions_init failed with error {result}." + ); + } + this._initialized = true; + + foreach ( var duplication in duplications ) { + result = ProcessNative.PosixSpawnFileActionsAddDup2( + this.Pointer, + duplication.SourceDescriptor, + duplication.DestinationDescriptor + ); + if ( 0 != result ) { + throw new InvalidOperationException( + $"posix_spawn_file_actions_adddup2 failed with error {result}." + ); + } + if ( duplication.CloseSource + && duplication.SourceDescriptor != duplication.DestinationDescriptor + ) { + result = ProcessNative.PosixSpawnFileActionsAddClose( + this.Pointer, + duplication.SourceDescriptor + ); + if ( 0 != result ) { + throw new InvalidOperationException( + $"posix_spawn_file_actions_addclose failed with error {result}." + ); + } + } + } + } catch { + this.Dispose(); + throw; + } + } + + /// + public void Dispose() { + if ( IntPtr.Zero == this.Pointer ) { + return; + } + if ( this._initialized ) { + _ = ProcessNative.PosixSpawnFileActionsDestroy( this.Pointer ); + } + Marshal.FreeHGlobal( this.Pointer ); + this.Pointer = IntPtr.Zero; + this._initialized = false; + } +} diff --git a/src/ProcessNative.cs b/src/ProcessNative.cs index 3e83537..3357550 100644 --- a/src/ProcessNative.cs +++ b/src/ProcessNative.cs @@ -191,6 +191,49 @@ IntPtr oldSet /// Gets the POSIX spawn flag that assigns the child process group. internal const short PosixSpawnSetProcessGroup = 0x0002; + /// Initializes one opaque POSIX spawn file-actions object. + [DllImport( + "libc", + EntryPoint = "posix_spawn_file_actions_init", + SetLastError = false + )] + internal static extern int PosixSpawnFileActionsInit( + IntPtr fileActions + ); + + /// Destroys one initialized POSIX spawn file-actions object. + [DllImport( + "libc", + EntryPoint = "posix_spawn_file_actions_destroy", + SetLastError = false + )] + internal static extern int PosixSpawnFileActionsDestroy( + IntPtr fileActions + ); + + /// Adds one ordered dup2 operation to POSIX spawn file actions. + [DllImport( + "libc", + EntryPoint = "posix_spawn_file_actions_adddup2", + SetLastError = false + )] + internal static extern int PosixSpawnFileActionsAddDup2( + IntPtr fileActions, + int sourceDescriptor, + int destinationDescriptor + ); + + /// Adds one ordered descriptor close to POSIX spawn file actions. + [DllImport( + "libc", + EntryPoint = "posix_spawn_file_actions_addclose", + SetLastError = false + )] + internal static extern int PosixSpawnFileActionsAddClose( + IntPtr fileActions, + int descriptor + ); + /// Initializes one opaque POSIX spawn-attribute object. [DllImport( "libc", diff --git a/src/ProcessRunOptions.cs b/src/ProcessRunOptions.cs index e647a4b..46f36bb 100644 --- a/src/ProcessRunOptions.cs +++ b/src/ProcessRunOptions.cs @@ -163,6 +163,17 @@ public Stream? StandardOutput { set; } + /// + /// Gets ordered POSIX child file-descriptor duplications applied atomically at spawn time. + /// + /// + /// Adding an item selects the native POSIX launcher. This capability is unsupported on Windows + /// and cannot be combined with managed standard-stream redirection or output capture. + /// + public IList PosixFileDescriptorDuplications { + get; + } = new List(); + /// /// Gets or sets whether a POSIX child inherits standard input as a write-only null /// device so reads fail rather than return end-of-file. diff --git a/src/ProcessRunner.cs b/src/ProcessRunner.cs index e0fb9a5..bb7084f 100644 --- a/src/ProcessRunner.cs +++ b/src/ProcessRunner.cs @@ -171,7 +171,10 @@ or UnauthorizedAccessException } executable = located.Value!; } - if ( null != options.ArgumentZero || ( options.CreateProcessGroup && !OperatingSystem.IsWindows() ) ) { + if ( null != options.ArgumentZero + || 0 < options.PosixFileDescriptorDuplications.Count + || ( options.CreateProcessGroup && !OperatingSystem.IsWindows() ) + ) { return await this.RunWithPosixSpawnAsync( options, executable, @@ -443,10 +446,14 @@ private async Task RunWithPosixSpawnAsync( CancellationToken cancellationToken ) { if ( OperatingSystem.IsWindows() ) { + var message = 0 < options.PosixFileDescriptorDuplications.Count + ? "POSIX file-descriptor duplication is unavailable on Windows." + : "The managed Windows launcher cannot set an independent native argument zero safely." + ; return this.HandlePosixSpawnSetupFailure( options, startedTimestamp, - "The managed Windows launcher cannot set an independent native argument zero safely." + message ); } if ( null != options.StandardInput @@ -486,11 +493,14 @@ CancellationToken cancellationToken options.SignalPolicy, options.UseUnreadableStandardInput ); + using var spawnFileActions = new PosixSpawnFileActionsScope( + options.PosixFileDescriptorDuplications + ); using var spawnAttributes = new PosixSpawnAttributeScope( options.CreateProcessGroup ); spawnResult = ProcessNative.PosixSpawn( out processId, path.Pointer, - IntPtr.Zero, + spawnFileActions.Pointer, spawnAttributes.Pointer, arguments.Pointer, environmentVector.Pointer diff --git a/src/README.md b/src/README.md index 7a3d394..d039e8a 100644 --- a/src/README.md +++ b/src/README.md @@ -14,7 +14,8 @@ The source layer includes: - process, process-group, session, and priority-selector target models; - arbitrary-process liveness and wait operations; - portable signal parsing, observation, and delivery; -- POSIX launch-time signal policy and process-group creation; and +- POSIX launch-time signal policy and process-group creation; +- ordered child-only POSIX file-descriptor duplication at spawn time; and - POSIX nice values with controlled Windows priority-class substitutions. ProcPs-specific process enumeration, `/proc` reporting fields, selection grammar, diff --git a/tests/Processes.Tests/src/ProcessRunnerTests.cs b/tests/Processes.Tests/src/ProcessRunnerTests.cs index eec91fa..77d8e6e 100644 --- a/tests/Processes.Tests/src/ProcessRunnerTests.cs +++ b/tests/Processes.Tests/src/ProcessRunnerTests.cs @@ -201,6 +201,65 @@ out var childProcessGroupId } } + /// Verifies native POSIX launch applies ordered child-only descriptor duplications. + [Fact] + public async Task PosixNativeLaunchAppliesFileDescriptorDuplications() { + if ( OperatingSystem.IsWindows() ) { + return; + } + + var outputPath = System.IO.Path.Combine( + System.IO.Path.GetTempPath(), + $"icod-processes-fd-{Guid.NewGuid():N}" + ); + ProcessResult result; + try { + await using ( var output = new FileStream( + outputPath, + FileMode.CreateNew, + FileAccess.Write, + FileShare.Read | FileShare.Write | FileShare.Delete + ) ) { + var descriptor = output.SafeFileHandle.DangerousGetHandle().ToInt32(); + var options = CreateNativeHostOptions( + "dual", + "1" + ); + options.PosixFileDescriptorDuplications.Add( + new PosixFileDescriptorDuplication( + descriptor, + 1, + closeSource: true + ) + ); + options.PosixFileDescriptorDuplications.Add( + new PosixFileDescriptorDuplication( + 1, + 2 + ) + ); + + result = await ProcessRunner.RunAsync( + options + ); + } + + var outputText = await File.ReadAllTextAsync( + outputPath + ); + Assert.True( result.Started ); + Assert.Equal( 0, result.ExitCode ); + Assert.Contains( "out-0", outputText, StringComparison.Ordinal ); + Assert.Contains( "err-0", outputText, StringComparison.Ordinal ); + } finally { + if ( File.Exists( outputPath ) ) { + File.Delete( + outputPath + ); + } + } + } + /// Verifies that native POSIX launch rejects managed output capture predictably. [Fact] public async Task PosixNativeLaunchRejectsCapturedOutput() {