mem_unix_test.go

     1  // Copyright 2025 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix
     6  
     7  package scan_test
     8  
     9  import (
    10  	"internal/runtime/gc"
    11  	"syscall"
    12  	"testing"
    13  	"unsafe"
    14  )
    15  
    16  func makeMem(t testing.TB, nPages int) ([]uintptr, func()) {
    17  	mem, err := syscall.Mmap(-1, 0, int(gc.PageSize*nPages), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_PRIVATE|syscall.MAP_ANON)
    18  	if err != nil {
    19  		t.Fatalf("mmap failed: %s", err)
    20  	}
    21  	free := func() {
    22  		syscall.Munmap(mem)
    23  	}
    24  	return unsafe.Slice((*uintptr)(unsafe.Pointer(unsafe.SliceData(mem))), len(mem)/8), free
    25  }
    26
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