Function Read

internal/pidfile/pidfile.go:37–50

Read reads the "PID file" at path, and returns the PID if it contains a valid PID of a running process, or 0 otherwise. It returns an error when failing to read the file, or if the file doesn't exist, but malformed content is ignored. Consumers should therefore check if the returned PID is a non-zer

(path string)

// is ignored. Consumers should therefore check if the returned PID is a non-zero
// value before use.
func Read(path string) (pid int, _ error) {
	pidByte, err := os.ReadFile(path)
	if err != nil {
		return 0, err
	}
	pid, err = strconv.Atoi(string(bytes.TrimSpace(pidByte)))
	if err != nil {
		return 0, nil
	}
	if pid != 0 && alive(pid) {
		return pid, nil
	}
	return 0, nil
}

// Write writes a "PID file" at the specified path. It returns an error if the
// file exists and contains a valid PID of a running process, or when failing