Interprocess pipe support (for stdout/stderr capture) (#866)

- **RAII pipe handles for child process stdout/stderr capture**: `StdoutPipeHandles` is now a proper RAII type with automatic cleanup, move semantics, and partial close support. This makes it safe to use pipes for capturing child process output without risking handle/fd leaks.

- **Optional separate stderr pipe**: `CreateProcOptions` now accepts a `StderrPipe` field so callers can capture stdout and stderr independently. When null (default), stderr shares the stdout pipe as before.

- **LogStreamListener with pluggable handler**: The TCP log stream listener accepts connections from remote processes and delivers parsed log lines through a `LogStreamHandler` interface, set dynamically via `SetHandler()`. This allows any client to receive log messages without depending on a specific console implementation.

- **TcpLogStreamSink for zen::logging**: A logging sink that forwards log messages to a `LogStreamListener` over TCP, using the native `zen::logging::Sink` infrastructure with proper thread-safe synchronization.

- **Reliable child process exit codes on Linux**: `waitpid` result handling is fixed so `ProcessHandle::GetExitCode()` returns the real exit code. `ProcessHandle::Reset()` reaps zombies directly, replacing the global `IgnoreChildSignals()` which prevented exit code collection entirely. Also fixes a TOCTOU race in `ProcessHandle::Wait()` on Linux/Mac.

- **Pipe capture test suite**: Tests covering stdout/stderr capture via pipes (both shared and separate modes), RAII cleanup, move semantics, and exit code propagation using `zentest-appstub` as the child process.

- **Service command integration tests**: Shell-based integration tests for `zen service` covering the full lifecycle (install, status, start, stop, uninstall) on all three platforms — Linux (systemd), macOS (launchd), and Windows (SCM via PowerShell).

- **Test script reorganization**: Platform-specific test scripts moved from `scripts/test_scripts/` into `scripts/test_linux/`, `test_mac/`, and `test_windows/`.

3 files changed, 0 insertions, 331 deletions

diff --git a/scripts/test_scripts/block-clone-test-mac.sh b/scripts/test_scripts/block-clone-test-mac.sh
deleted file mode 100755
index a3d3ca4d3..000000000
--- a/scripts/test_scripts/block-clone-test-mac.sh
+++ /dev/null
@@ -1,43 +0,0 @@
-#!/usr/bin/env bash
-# Test block-clone functionality on macOS (APFS).
-#
-# APFS is the default filesystem on modern Macs and natively supports
-# clonefile(), so no special setup is needed — just run the tests.
-#
-# Usage:
-#   ./scripts/test_scripts/block-clone-test-mac.sh [path-to-zencore-test]
-#
-# If no path is given, defaults to build/macosx/<arch>/debug/zencore-test
-# relative to the repository root.
-
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
-
-ARCH="$(uname -m)"
-TEST_BINARY="${1:-$REPO_ROOT/build/macosx/$ARCH/debug/zencore-test}"
-
-if [ ! -x "$TEST_BINARY" ]; then
-    echo "error: test binary not found or not executable: $TEST_BINARY" >&2
-    echo "hint:  build with 'xmake config -m debug && xmake build zencore-test'" >&2
-    exit 1
-fi
-
-# Verify we're on APFS
-BINARY_DIR="$(dirname "$TEST_BINARY")"
-FS_TYPE="$(diskutil info "$(df "$BINARY_DIR" | tail -1 | awk '{print $1}')" 2>/dev/null | grep "Type (Bundle)" | awk '{print $NF}' || true)"
-
-if [ "$FS_TYPE" != "apfs" ]; then
-    echo "warning: filesystem does not appear to be APFS (got: ${FS_TYPE:-unknown}), clone tests may skip" >&2
-fi
-
-TEST_CASES="TryCloneFile,CopyFile.Clone,SupportsBlockRefCounting,CloneQueryInterface"
-
-echo "Running block-clone tests ..."
-echo "---"
-"$TEST_BINARY" \
-    --test-suite="core.filesystem" \
-    --test-case="$TEST_CASES"
-echo "---"
-echo "All block-clone tests passed."
diff --git a/scripts/test_scripts/block-clone-test-windows.ps1 b/scripts/test_scripts/block-clone-test-windows.ps1
deleted file mode 100644
index df24831a4..000000000
--- a/scripts/test_scripts/block-clone-test-windows.ps1
+++ /dev/null
@@ -1,145 +0,0 @@
-# Test block-clone functionality on a temporary ReFS VHD.
-#
-# Requires:
-#   - Administrator privileges
-#   - Windows Server, or Windows 10/11 Pro for Workstations (ReFS support)
-#   - Hyper-V PowerShell module (for New-VHD), or diskpart fallback
-#
-# Usage:
-#   # From an elevated PowerShell prompt:
-#   .\scripts\test_scripts\block-clone-test-windows.ps1 [-TestBinary <path>]
-#
-# If -TestBinary is not given, defaults to build\windows\x64\debug\zencore-test.exe
-# relative to the repository root.
-
-param(
-    [string]$TestBinary = ""
-)
-
-$ErrorActionPreference = "Stop"
-
-$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Definition
-$RepoRoot = (Resolve-Path "$ScriptDir\..\..").Path
-
-if (-not $TestBinary) {
-    $TestBinary = Join-Path $RepoRoot "build\windows\x64\debug\zencore-test.exe"
-}
-
-$ImageSizeMB = 2048
-$TestCases = "TryCloneFile,CopyFile.Clone,SupportsBlockRefCounting,CloneQueryInterface"
-
-$VhdPath = ""
-$MountLetter = ""
-
-function Cleanup {
-    $ErrorActionPreference = "SilentlyContinue"
-
-    if ($MountLetter) {
-        Write-Host "Dismounting VHD ..."
-        Dismount-VHD -Path $VhdPath -ErrorAction SilentlyContinue
-    }
-    if ($VhdPath -and (Test-Path $VhdPath)) {
-        Remove-Item -Force $VhdPath -ErrorAction SilentlyContinue
-    }
-}
-
-trap {
-    Cleanup
-    throw $_
-}
-
-# --- Preflight checks ---
-
-$IsAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(
-    [Security.Principal.WindowsBuiltInRole]::Administrator)
-if (-not $IsAdmin) {
-    Write-Error "This script must be run as Administrator (for VHD mount/format)."
-    exit 1
-}
-
-if (-not (Test-Path $TestBinary)) {
-    Write-Error "Test binary not found: $TestBinary`nHint: build with 'xmake config -m debug && xmake build zencore-test'"
-    exit 1
-}
-
-# Check that ReFS formatting is available
-$RefsAvailable = $true
-try {
-    # A quick check: on non-Server/Workstation SKUs, Format-Volume -FileSystem ReFS will fail
-    $OsCaption = (Get-CimInstance Win32_OperatingSystem).Caption
-    if ($OsCaption -notmatch "Server|Workstation|Enterprise") {
-        Write-Warning "ReFS may not be available on this Windows edition: $OsCaption"
-        Write-Warning "Continuing anyway — format step will fail if unsupported."
-    }
-} catch {
-    # Non-fatal, just proceed
-}
-
-# --- Create and mount ReFS VHD ---
-
-$VhdPath = Join-Path $env:TEMP "refs-clone-test-$([guid]::NewGuid().ToString('N').Substring(0,8)).vhdx"
-
-Write-Host "Creating ${ImageSizeMB}MB VHDX at $VhdPath ..."
-
-try {
-    # Prefer Hyper-V cmdlet if available
-    New-VHD -Path $VhdPath -SizeBytes ($ImageSizeMB * 1MB) -Fixed | Out-Null
-} catch {
-    # Fallback to diskpart
-    Write-Host "New-VHD not available, falling back to diskpart ..."
-    $DiskpartScript = @"
-create vdisk file="$VhdPath" maximum=$ImageSizeMB type=fixed
-"@
-    $DiskpartScript | diskpart | Out-Null
-}
-
-Write-Host "Mounting and initializing VHD ..."
-
-Mount-VHD -Path $VhdPath
-$Disk = Get-VHD -Path $VhdPath | Get-Disk
-
-# Suppress Explorer's auto-open / "format disk?" prompts for the raw partition
-Stop-Service ShellHWDetection -ErrorAction SilentlyContinue
-
-try {
-    Initialize-Disk -Number $Disk.Number -PartitionStyle GPT -ErrorAction SilentlyContinue
-    $Partition = New-Partition -DiskNumber $Disk.Number -UseMaximumSize -AssignDriveLetter
-    $MountLetter = $Partition.DriveLetter
-
-    Write-Host "Formatting ${MountLetter}: as ReFS with integrity disabled ..."
-    Format-Volume -DriveLetter $MountLetter -FileSystem ReFS -NewFileSystemLabel "CloneTest" -Confirm:$false | Out-Null
-
-    # Disable integrity streams (required for block cloning to work on ReFS)
-    Set-FileIntegrity "${MountLetter}:\" -Enable $false -ErrorAction SilentlyContinue
-} finally {
-    Start-Service ShellHWDetection -ErrorAction SilentlyContinue
-}
-
-$MountRoot = "${MountLetter}:\"
-
-# --- Copy test binary and run ---
-
-Write-Host "Copying test binary to ReFS volume ..."
-Copy-Item $TestBinary "$MountRoot\zencore-test.exe"
-
-Write-Host "Running block-clone tests ..."
-Write-Host "---"
-
-$proc = Start-Process -FilePath "$MountRoot\zencore-test.exe" `
-    -ArgumentList "--test-suite=core.filesystem", "--test-case=$TestCases" `
-    -NoNewWindow -Wait -PassThru
-
-Write-Host "---"
-
-if ($proc.ExitCode -ne 0) {
-    Write-Error "Tests failed with exit code $($proc.ExitCode)"
-    Cleanup
-    exit $proc.ExitCode
-}
-
-Write-Host "ReFS: all block-clone tests passed."
-
-# --- Cleanup ---
-
-Cleanup
-Write-Host "Done."
diff --git a/scripts/test_scripts/block-clone-test.sh b/scripts/test_scripts/block-clone-test.sh
deleted file mode 100755
index 7c6bf5605..000000000
--- a/scripts/test_scripts/block-clone-test.sh
+++ /dev/null
@@ -1,143 +0,0 @@
-#!/usr/bin/env bash
-# Test block-clone functionality on temporary Btrfs and XFS loopback filesystems.
-#
-# Requires: root/sudo, btrfs-progs (mkfs.btrfs), xfsprogs (mkfs.xfs)
-#
-# Usage:
-#   sudo ./scripts/test_scripts/block-clone-test.sh [path-to-zencore-test]
-#
-# If no path is given, defaults to build/linux/x86_64/debug/zencore-test
-# relative to the repository root.
-#
-# Options:
-#   --btrfs-only   Only test Btrfs
-#   --xfs-only     Only test XFS
-
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
-
-TEST_BINARY=""
-RUN_BTRFS=true
-RUN_XFS=true
-
-for arg in "$@"; do
-    case "$arg" in
-        --btrfs-only) RUN_XFS=false ;;
-        --xfs-only)   RUN_BTRFS=false ;;
-        *)            TEST_BINARY="$arg" ;;
-    esac
-done
-
-TEST_BINARY="${TEST_BINARY:-$REPO_ROOT/build/linux/x86_64/debug/zencore-test}"
-IMAGE_SIZE="512M"
-TEST_CASES="TryCloneFile,CopyFile.Clone,SupportsBlockRefCounting,CloneQueryInterface"
-
-# Track all temp files for cleanup
-CLEANUP_MOUNTS=()
-CLEANUP_DIRS=()
-CLEANUP_FILES=()
-
-cleanup() {
-    local exit_code=$?
-    set +e
-
-    for mnt in "${CLEANUP_MOUNTS[@]}"; do
-        if mountpoint -q "$mnt" 2>/dev/null; then
-            umount "$mnt"
-        fi
-    done
-    for dir in "${CLEANUP_DIRS[@]}"; do
-        [ -d "$dir" ] && rmdir "$dir"
-    done
-    for f in "${CLEANUP_FILES[@]}"; do
-        [ -f "$f" ] && rm -f "$f"
-    done
-
-    if [ $exit_code -ne 0 ]; then
-        echo "FAILED (exit code $exit_code)"
-    fi
-    exit $exit_code
-}
-trap cleanup EXIT
-
-# --- Preflight checks ---
-
-if [ "$(id -u)" -ne 0 ]; then
-    echo "error: this script must be run as root (for mount/umount)" >&2
-    exit 1
-fi
-
-if [ ! -x "$TEST_BINARY" ]; then
-    echo "error: test binary not found or not executable: $TEST_BINARY" >&2
-    echo "hint:  build with 'xmake config -m debug && xmake build zencore-test'" >&2
-    exit 1
-fi
-
-if $RUN_BTRFS && ! command -v mkfs.btrfs &>/dev/null; then
-    echo "warning: mkfs.btrfs not found — install btrfs-progs to test Btrfs, skipping" >&2
-    RUN_BTRFS=false
-fi
-
-if $RUN_XFS && ! command -v mkfs.xfs &>/dev/null; then
-    echo "warning: mkfs.xfs not found — install xfsprogs to test XFS, skipping" >&2
-    RUN_XFS=false
-fi
-
-if ! $RUN_BTRFS && ! $RUN_XFS; then
-    echo "error: no filesystems to test" >&2
-    exit 1
-fi
-
-# --- Helper to create, mount, and run tests on a loopback filesystem ---
-
-run_tests_on_fs() {
-    local fs_type="$1"
-    local mkfs_cmd="$2"
-
-    echo ""
-    echo "========================================"
-    echo "  Testing block-clone on $fs_type"
-    echo "========================================"
-
-    local image_path mount_path
-    image_path="$(mktemp "/tmp/${fs_type}-clone-test-XXXXXX.img")"
-    mount_path="$(mktemp -d "/tmp/${fs_type}-clone-mount-XXXXXX")"
-    CLEANUP_FILES+=("$image_path")
-    CLEANUP_DIRS+=("$mount_path")
-    CLEANUP_MOUNTS+=("$mount_path")
-
-    echo "Creating ${IMAGE_SIZE} ${fs_type} image at ${image_path} ..."
-    truncate -s "$IMAGE_SIZE" "$image_path"
-    $mkfs_cmd "$image_path"
-
-    echo "Mounting at ${mount_path} ..."
-    mount -o loop "$image_path" "$mount_path"
-    chmod 777 "$mount_path"
-
-    echo "Copying test binary ..."
-    cp "$TEST_BINARY" "$mount_path/zencore-test"
-    chmod +x "$mount_path/zencore-test"
-
-    echo "Running tests ..."
-    echo "---"
-    "$mount_path/zencore-test" \
-        --test-suite="core.filesystem" \
-        --test-case="$TEST_CASES"
-    echo "---"
-    echo "$fs_type: all block-clone tests passed."
-}
-
-# --- Run ---
-
-if $RUN_BTRFS; then
-    run_tests_on_fs "btrfs" "mkfs.btrfs -q"
-fi
-
-if $RUN_XFS; then
-    run_tests_on_fs "xfs" "mkfs.xfs -q -m reflink=1"
-fi
-
-echo ""
-echo "All block-clone tests passed."