55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package runc
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import (
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"os/exec"
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"syscall"
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)
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var Monitor ProcessMonitor = &defaultMonitor{}
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// ProcessMonitor is an interface for process monitoring
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//
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// It allows daemons using go-runc to have a SIGCHLD handler
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// to handle exits without introducing races between the handler
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// and go's exec.Cmd
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// These methods should match the methods exposed by exec.Cmd to provide
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// a consistent experience for the caller
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type ProcessMonitor interface {
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Output(*exec.Cmd) ([]byte, error)
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CombinedOutput(*exec.Cmd) ([]byte, error)
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Run(*exec.Cmd) error
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Start(*exec.Cmd) error
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Wait(*exec.Cmd) (int, error)
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}
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type defaultMonitor struct {
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}
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func (m *defaultMonitor) Output(c *exec.Cmd) ([]byte, error) {
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return c.Output()
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}
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func (m *defaultMonitor) CombinedOutput(c *exec.Cmd) ([]byte, error) {
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return c.CombinedOutput()
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}
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func (m *defaultMonitor) Run(c *exec.Cmd) error {
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return c.Run()
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}
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func (m *defaultMonitor) Start(c *exec.Cmd) error {
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return c.Start()
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}
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func (m *defaultMonitor) Wait(c *exec.Cmd) (int, error) {
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if err := c.Wait(); err != nil {
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if exitErr, ok := err.(*exec.ExitError); ok {
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if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
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return status.ExitStatus(), nil
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}
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}
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return -1, err
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}
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return 0, nil
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}
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