const internal/syscall/unix.P_PIDFD

3 uses

	internal/syscall/unix (current package)
		waitid_linux.go#L14: 	P_PIDFD = 3

	os
		pidfd_linux.go#L109: 		return unix.Waitid(unix.P_PIDFD, int(handle), &info, syscall.WEXITED, &rusage)
		pidfd_linux.go#L176: 		return unix.Waitid(unix.P_PIDFD, int(fd), &info, syscall.WEXITED, nil)