const internal/syscall/unix.P_PID

2 uses

	internal/syscall/unix (current package)
		waitid_linux.go#L13: 	P_PID   = 1

	os
		wait_waitid.go#L24: 		return unix.Waitid(unix.P_PID, p.Pid, &info, syscall.WEXITED|syscall.WNOWAIT, nil)