open-consul/agent/proxyprocess/process_unix.go

39 lines
1.0 KiB
Go

// +build !windows
package proxyprocess
import (
"fmt"
"os"
"os/exec"
"syscall"
)
// findProcess for non-Windows. Note that this very likely doesn't
// work for all non-Windows platforms Go supports and we should expand
// support as we experience it.
func findProcess(pid int) (*os.Process, error) {
// FindProcess never fails on unix-like systems.
p, err := os.FindProcess(pid)
if err != nil {
return nil, err
}
// On Unix-like systems, we can verify a process is alive by sending
// a 0 signal. This will do nothing to the process but will still
// return errors if the process is gone.
err = p.Signal(syscall.Signal(0))
if err == nil {
return p, nil
}
return nil, fmt.Errorf("process %d is dead or running as another user", pid)
}
// configureDaemon is called prior to Start to allow system-specific setup.
func configureDaemon(cmd *exec.Cmd) {
// Start it in a new sessions (and hence process group) so that killing agent
// (even with Ctrl-C) won't kill proxy.
cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
}