github.com/Andyfoo/golang/x/sys@v0.0.0-20190901054642-57c1bf301704/unix/mmap_unix_test.go (about)

     1  // Copyright 2014 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  // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
     6  
     7  package unix_test
     8  
     9  import (
    10  	"runtime"
    11  	"testing"
    12  
    13  	"github.com/Andyfoo/golang/x/sys/unix"
    14  )
    15  
    16  func TestMmap(t *testing.T) {
    17  	b, err := unix.Mmap(-1, 0, unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
    18  	if err != nil {
    19  		t.Fatalf("Mmap: %v", err)
    20  	}
    21  	if err := unix.Mprotect(b, unix.PROT_READ|unix.PROT_WRITE); err != nil {
    22  		t.Fatalf("Mprotect: %v", err)
    23  	}
    24  
    25  	b[0] = 42
    26  
    27  	if runtime.GOOS == "aix" {
    28  		t.Skip("msync returns invalid argument for AIX, skipping msync test")
    29  	} else {
    30  		if err := unix.Msync(b, unix.MS_SYNC); err != nil {
    31  			t.Fatalf("Msync: %v", err)
    32  		}
    33  	}
    34  
    35  	if err := unix.Madvise(b, unix.MADV_DONTNEED); err != nil {
    36  		t.Fatalf("Madvise: %v", err)
    37  	}
    38  	if err := unix.Munmap(b); err != nil {
    39  		t.Fatalf("Munmap: %v", err)
    40  	}
    41  }