You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.go
    path of file: ./repos/docker-ce/components/engine/vendor/github.com/containerd/containerd/runtime/v1/shim/client
    
    the code of the file until where you have to start completion: // +build !windows

/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use 
    
func (c *Client) signalShim(ctx context.Context, sig syscall.Signal) error {
	info, err := c.ShimInfo(ctx, empty)
	if err != nil {
		return err
	}
	pid := int(info.ShimPid)
	// make sure we don't kill ourselves if we are running a local shim
	if os.Getpid() == pid {
		return nil
	}
	if err := unix.Kill(pid, sig); err != nil && err != unix.ESRCH {
		return err
	}
	// wait for shim to die after being signaled
	select {
	case <-ctx.Done():
		return ctx.Err()
	case <-c.waitForExit(ctx, pid):
		return nil
	}
}