Function killProcessByPort

frontend/src/main/backend.ts:260–313

(port: number)

// Kill process by port
function killProcessByPort(port: number) {
  const { exec } = require('child_process')

  if (process.platform === 'win32') {
    // Windows: use netstat and taskkill
    exec(`netstat -ano | findstr :${port}`, (error, stdout) => {
      if (!error && stdout) {
        const lines = stdout.split('\n')
        const pids = new Set()

        lines.forEach((line) => {
          const match = line.match(/\s+(\d+)\s*$/)
          if (match) {
            pids.add(match[1])
          }
        })

        pids.forEach((pid) => {
          if (pid !== '0') {
            logToBackendFile(`Killing process on port ${port}, PID: ${pid}`)
            exec(`taskkill /PID ${pid} /F`, (killError) => {
              if (killError) {
                logToBackendFile(`Failed to kill PID ${pid}: ${killError.message}`)
              } else {
                logToBackendFile(`Successfully killed PID ${pid}`)
              }
            })
          }
        })
      }
    })
  } else {
    // Unix/Linux/macOS: use lsof and kill
    exec(`lsof -ti:${port}`, (error, stdout) => {
      if (!error && stdout) {
        const pids = stdout
          .trim()
          .split('\n')
          .filter((pid) => pid)
        pids.forEach((pid) => {
          logToBackendFile(`Killing process on port ${port}, PID: ${pid}`)
          try {
            process.kill(parseInt(pid), 'SIGKILL')
            logToBackendFile(`Successfully killed PID ${pid}`)
          } catch (killError) {
            logToBackendFile(`Failed to kill PID ${pid}: ${killError}`)
          }
        })
      } else if (error) {
        logToBackendFile(`No process found on port ${port}: ${error.message}`)
      }
    })
  }
}

// Ensure backend is running (start if not running)
export async function ensureBackendRunning(mainWindow: BrowserWindow) {