39 lines
754 B
Go
39 lines
754 B
Go
package utils
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
func FindProcess(pid int) (*os.Process, error) {
|
|
if pid <= 0 {
|
|
return nil, fmt.Errorf("invalid pid %v", pid)
|
|
}
|
|
// The error doesn't mean anything on Unix systems, let's just check manually
|
|
// that the new gunicorn master has properly started
|
|
// https://github.com/golang/go/issues/34396
|
|
proc, err := os.FindProcess(int(pid))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = proc.Signal(syscall.Signal(0))
|
|
if err == nil {
|
|
return proc, nil
|
|
}
|
|
if err.Error() == "os: process already finished" {
|
|
return nil, nil
|
|
}
|
|
errno, ok := err.(syscall.Errno)
|
|
if !ok {
|
|
return nil, err
|
|
}
|
|
switch errno {
|
|
case syscall.ESRCH:
|
|
return nil, nil
|
|
case syscall.EPERM:
|
|
return proc, nil
|
|
}
|
|
return nil, err
|
|
}
|