podman

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//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd
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package machine
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import (
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	"errors"
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	"fmt"
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	"syscall"
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	"time"
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	psutil "github.com/shirou/gopsutil/v3/process"
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	"github.com/sirupsen/logrus"
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	"golang.org/x/sys/unix"
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)
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const (
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	loops     = 8
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	sleepTime = time.Millisecond * 1
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)
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// backoffForProcess checks if the process still exists, for something like
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// sigterm. If the process still exists after loops and sleep time are exhausted,
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// an error is returned
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func backoffForProcess(p *psutil.Process) error {
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	sleepInterval := sleepTime
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	for i := 0; i < loops; i++ {
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		running, err := p.IsRunning()
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		if err != nil {
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			// It is possible that while in our loop, the PID vaporize triggering
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			// an input/output error (#21845)
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			if errors.Is(err, unix.EIO) {
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				return nil
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			}
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			return fmt.Errorf("checking if process running: %w", err)
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		}
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		if !running {
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			return nil
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		}
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		time.Sleep(sleepInterval)
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		// double the time
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		sleepInterval += sleepInterval
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	}
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	return fmt.Errorf("process %d has not ended", p.Pid)
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}
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// / waitOnProcess takes a pid and sends a sigterm to it. it then waits for the
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// process to not exist.  if the sigterm does not end the process after an interval,
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// then sigkill is sent.  it also waits for the process to exit after the sigkill too.
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func waitOnProcess(processID int) error {
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	logrus.Infof("Going to stop gvproxy (PID %d)", processID)
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	p, err := psutil.NewProcess(int32(processID))
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	if err != nil {
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		return fmt.Errorf("looking up PID %d: %w", processID, err)
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	}
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	running, err := p.IsRunning()
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	if err != nil {
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		return fmt.Errorf("checking if gvproxy is running: %w", err)
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	}
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	if !running {
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		return nil
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	}
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	if err := p.Kill(); err != nil {
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		if errors.Is(err, syscall.ESRCH) {
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			logrus.Debugf("Gvproxy already dead, exiting cleanly")
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			return nil
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		}
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		return err
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	}
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	return backoffForProcess(p)
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}
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