// Handle lifecycle events
func handleSignals(srv *falcore.Server) {
var sig os.Signal
pid := syscall.Getpid()
for {
sig = <-signal.Incoming
if usig, ok := sig.(os.UnixSignal); ok {
switch usig {
case os.SIGHUP:
// send this to the paraent process to initiate the restart
fmt.Println(pid, "Received SIGHUP. forking.")
cpid, err := forker(srv)
fmt.Println(pid, "Forked pid:", cpid, "errno:", err)
case os.SIGUSR1:
// child sends this back to the parent when it's ready to Accept
fmt.Println(pid, "Received SIGUSR1. Stopping accept.")
srv.StopAccepting()
case os.SIGINT:
fmt.Println(pid, "Received SIGINT. Shutting down.")
os.Exit(0)
case os.SIGTERM:
fmt.Println(pid, "Received SIGTERM. Terminating.")
os.Exit(0)
case os.SIGTSTP:
fmt.Println(pid, "Received SIGTSTP. Stopping.")
syscall.Kill(pid, syscall.SIGSTOP)
default:
fmt.Println(pid, "Received", sig, ": ignoring")
}
}
}
}
// setup and fork/exec myself. Make sure to keep open important FD's that won't get re-created by the child
// specifically, std* and your listen socket
func forker(srv *falcore.Server) (pid int, err int) {
fmt.Printf("Forking now with socket: %v\n", srv.SocketFd())
mypath := os.Args[0]
args := []string{mypath, "-socket", fmt.Sprintf("%v", srv.SocketFd())}
attr := new(syscall.ProcAttr)
attr.Files = append([]int(nil), 0, 1, 2, srv.SocketFd())
pid, err = syscall.ForkExec(mypath, args, attr)
return
}