kokan/go-reap

Child process reaping utilities for Go

go-reap

Provides a super simple set of functions for reaping child processes. This is useful for running applications as PID 1 in a Docker container.

Note that a mutex is supplied to allow your application to prevent reaping of child processes during certain periods. You need to use care in order to prevent the reaper from stealing your return values from uses of packages like Go's exec. We use an RWMutex so that we don't serialize all of your application's execution of sub processes with each other, but we do serialize them with reaping. Your application should get a read lock when it wants to do a wait and be safe from the reaper.

This should be supported on most UNIX flavors, but is not supported on Windows or Solaris. Unsupported platforms have a stub implementation that's safe to call, as well as an API to check if reaping is supported so that you can produce an error in your application code.

Documentation

The full documentation is available on Godoc.

Example

Below is a simple example of usage

// Reap children with no control or feedback.
go reap.ReapChildren(nil, nil, nil)

// Get feedback on reaped children and errors.
if reap.IsSupported() {
	pids := make(reap.PidCh, 1)
	errors := make(reap.ErrorCh, 1)
	done := make(chan struct{})
	var reapLock sync.RWMutex
	go reap.ReapChildren(pids, errors, done, &reapLock)
	// ...
	close(done)
} else {
	fmt.Println("Sorry, go-reap isn't supported on your platform.")
}