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Edit: /opt/golang/1.22.0/src/runtime/runtime_mmap_test.go

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package runtime_test

import (
	"runtime"
	"testing"
	"unsafe"
)

// Test that the error value returned by mmap is positive, as that is
// what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects.
// See the uses of ENOMEM in sysMap in those files.
func TestMmapErrorSign(t *testing.T) {
	p, err := runtime.Mmap(nil, ^uintptr(0)&^(runtime.GetPhysPageSize()-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)

if p != nil || err != runtime.ENOMEM {
		t.Errorf("mmap = %v, %v, want nil, %v", p, err, runtime.ENOMEM)
	}
}

func TestPhysPageSize(t *testing.T) {
	// Mmap fails if the address is not page aligned, so we can
	// use this to test if the page size is the true page size.
	ps := runtime.GetPhysPageSize()

// Get a region of memory to play with. This should be page-aligned.
	b, err := runtime.Mmap(nil, 2*ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
	if err != 0 {
		t.Fatalf("Mmap: %v", err)
	}

if runtime.GOOS == "aix" {
		// AIX does not allow mapping a range that is already mapped.
		runtime.Munmap(unsafe.Pointer(uintptr(b)), 2*ps)
	}

// Mmap should fail at a half page into the buffer.
	_, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps/2), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0)
	if err == 0 {
		t.Errorf("Mmap should have failed with half-page alignment %d, but succeeded: %v", ps/2, err)
	}

// Mmap should succeed at a full page into the buffer.
	_, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0)
	if err != 0 {
		t.Errorf("Mmap at full-page alignment %d failed: %v", ps, err)
	}
}

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