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// Copyright 2014 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 aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
package unix_test
import (
"runtime"
"testing"
"golang.org/x/sys/unix"
)
func TestMmap(t *testing.T) {
mmapProt := unix.PROT_NONE
mprotectProt := unix.PROT_READ | unix.PROT_WRITE
// On NetBSD PAX mprotect prohibits setting protection bits
// missing from the original mmap call unless explicitly
// requested with PROT_MPROTECT.
if runtime.GOOS == "netbsd" {
// PROT_MPROTECT(x) is defined as ((x) << 3):
// https://github.com/NetBSD/src/blob/aba449a55bf91b44bc68f542edd9afa341962b89/sys/sys/mman.h#L73
mmapProt = mprotectProt << 3
}
b, err := unix.Mmap(-1, 0, unix.Getpagesize(), mmapProt, unix.MAP_ANON|unix.MAP_PRIVATE)
if err != nil {
t.Fatalf("Mmap: %v", err)
}
if err := unix.Mprotect(b, mprotectProt); err != nil {
t.Fatalf("Mprotect: %v", err)
}
b[0] = 42
if runtime.GOOS == "aix" {
t.Skip("msync returns invalid argument for AIX, skipping msync test")
} else {
if err := unix.Msync(b, unix.MS_SYNC); err != nil {
t.Fatalf("Msync: %v", err)
}
}
if err := unix.Madvise(b, unix.MADV_DONTNEED); err != nil {
t.Fatalf("Madvise: %v", err)
}
if err := unix.Munmap(b); err != nil {
t.Fatalf("Munmap: %v", err)
}
}
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