package cmdn

import (
	"os/exec"
	"syscall"
)

// terminateProcess stops the command by sending its process group a SIGTERM signal.
// Stop is idempotent. An error should only be returning to the rare case that
// Stop is called immediately after the command ends but before Start can
// update its internal state.
func terminateProcess(pid int) error {
	// Signal the process group (-pid), not just the process, so that the process
	// and all its children are signaled. Else, child processes can keep running and
	// keep the stdout/stderr fd open and cause cmd.Wait to hang.
	return syscall.Kill(-pid, syscall.SIGTERM)
}

func setProcessGroupID(cmd *exec.Cmd) {
	cmd.SysProcAttr = &syscall.SysProcAttr{Setgpid: true}
}