proc_unix.go

//go:build !windows

package main

import (
	"os"
	"os/exec"
	"syscall"
)

// setProcessGroup puts the command in its own process group.
func setProcessGroup(cmd *exec.Cmd) {
	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
}

// killProcessGroup sends SIGKILL to the process group.
func killProcessGroup(cmd *exec.Cmd) {
	if cmd.Process != nil {
		syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
	}
}

// terminateProcessGroup sends SIGTERM to the process group, asking it to exit
// gracefully. Returns to be escalated via killProcessGroup if it doesn't.
func terminateProcessGroup(cmd *exec.Cmd) {
	if cmd.Process != nil {
		syscall.Kill(-cmd.Process.Pid, syscall.SIGTERM)
	}
}

// processAlive reports whether any process in the group is still running.
func processAlive(cmd *exec.Cmd) bool {
	if cmd == nil || cmd.Process == nil {
		return false
	}
	return syscall.Kill(-cmd.Process.Pid, 0) == nil
}

// termSignals returns the signals to watch for graceful shutdown.
func termSignals() []os.Signal {
	return []os.Signal{syscall.SIGINT, syscall.SIGTERM}
}