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// +build windows
package singleinstance
import (
"os"
"strconv"
)
// CreateLockFile tries to create a file with given name and acquire an
// exclusive lock on it. If the file already exists AND is still locked, it will
// fail.
func CreateLockFile(filename string) (*os.File, error) {
if _, err := os.Stat(filename); err == nil {
// If the files exists, we first try to remove it
if err = os.Remove(filename); err != nil {
return nil, err
}
} else if !os.IsNotExist(err) {
return nil, err
}
file, err := os.OpenFile(filename, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
if err != nil {
return nil, err
}
// Write PID to lock file
_, err = file.WriteString(strconv.Itoa(os.Getpid()))
if err != nil {
return nil, err
}
return file, nil
}
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