Function getAncestorPidsAsync

src/utils/genericProcessUtils.ts:36–86

(
  pid: string | number,
  maxDepth = 10,
)

 * @returns Array of ancestor PIDs from immediate parent to furthest ancestor
 */
export async function getAncestorPidsAsync(
  pid: string | number,
  maxDepth = 10,
): Promise<number[]> {
  if (process.platform === 'win32') {
    // For Windows, use a PowerShell script that walks the process tree
    const script = `
      $pid = ${String(pid)}
      $ancestors = @()
      for ($i = 0; $i -lt ${maxDepth}; $i++) {
        $proc = Get-CimInstance Win32_Process -Filter "ProcessId=$pid" -ErrorAction SilentlyContinue
        if (-not $proc -or -not $proc.ParentProcessId -or $proc.ParentProcessId -eq 0) { break }
        $pid = $proc.ParentProcessId
        $ancestors += $pid
      }
      $ancestors -join ','
    `.trim()

    const result = await execFileNoThrowWithCwd(
      'powershell.exe',
      ['-NoProfile', '-Command', script],
      { timeout: 3000 },
    )
    if (result.code !== 0 || !result.stdout?.trim()) {
      return []
    }
    return result.stdout
      .trim()
      .split(',')
      .filter(Boolean)
      .map(p => parseInt(p, 10))
      .filter(p => !isNaN(p))
  }

  // For Unix, use a shell command that walks up the process tree
  // This uses a single process invocation instead of multiple sequential calls
  const script = `pid=${String(pid)}; for i in $(seq 1 ${maxDepth}); do ppid=$(ps -o ppid= -p $pid 2>/dev/null | tr -d ' '); if [ -z "$ppid" ] || [ "$ppid" = "0" ] || [ "$ppid" = "1" ]; then break; fi; echo $ppid; pid=$ppid; done`

  const result = await execFileNoThrowWithCwd('sh', ['-c', script], {
    timeout: 3000,
  })
  if (result.code !== 0 || !result.stdout?.trim()) {
    return []
  }
  return result.stdout
    .trim()
    .split('\n')
    .filter(Boolean)
    .map(p => parseInt(p, 10))
    .filter(p => !isNaN(p))
}

/**
 * Gets the command line for a given process