CL 570681 ("os: make FindProcess use pidfd on Linux") mentions accepted proposal go.dev/issue/51246 (described as fully implemented in Go 1.22) and NeedsInvestigation continuation issue go.dev/issue/62654.

	if err != nil {
		t.Fatalf("error reading child pid: %v\n", err)
	}
	if n != 8 {
		t.Fatalf("unexpected short read n = %d\n", n)
	}
	pid := binary.LittleEndian.Uint64(b[:])
	process, err := os.FindProcess(int(pid))
	if err != nil {
		t.Fatalf("unable to find child process: %v", err)
	}

	// Wait for the third child to write a byte indicating that it is
	// entering the read.
	b = make([]byte, 1)

		return
	}
	_, err = w.Write(b)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
	}
}

// notifyExit sends SIGTERM to itself
func notifyExit() {
	p, err := os.FindProcess(os.Getpid())
	if err != nil {
		log.Error(err)
	}
	if err := p.Signal(syscall.SIGTERM); err != nil {
		log.Errorf("failed to send SIGTERM to self: %v", err)
	}
}

		t.Fatalf("Child process reports parent process id '%v', expected '%v'", childPpid, ourPid)
	}
}

func TestKillFindProcess(t *testing.T) {
	testKillProcess(t, func(p *Process) {
		p2, err := FindProcess(p.Pid)
		if err != nil {
			t.Fatalf("Failed to find test process: %v", err)
		}
		err = p2.Kill()
		if err != nil {
			t.Fatalf("Failed to kill test process: %v", err)
		}
	})
}

		{"Executable", Func, 8},
		{"Exit", Func, 0},
		{"Expand", Func, 0},
		{"ExpandEnv", Func, 0},
		{"File", Type, 0},
		{"FileInfo", Type, 0},
		{"FileMode", Type, 0},
		{"FindProcess", Func, 0},
		{"Getegid", Func, 0},
		{"Getenv", Func, 0},
		{"Geteuid", Func, 0},
		{"Getgid", Func, 0},
		{"Getgroups", Func, 0},
		{"Getpagesize", Func, 0},
		{"Getpid", Func, 0},

return undefined;}