golang.org/x/sys@v0.20.1-0.20240517151509-673e0f94c16d/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 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris 6 7 package unix_test 8 9 import ( 10 "runtime" 11 "testing" 12 13 "golang.org/x/sys/unix" 14 ) 15 16 func TestMmap(t *testing.T) { 17 mmapProt := unix.PROT_NONE 18 mprotectProt := unix.PROT_READ | unix.PROT_WRITE 19 // On NetBSD PAX mprotect prohibits setting protection bits 20 // missing from the original mmap call unless explicitly 21 // requested with PROT_MPROTECT. 22 if runtime.GOOS == "netbsd" { 23 // PROT_MPROTECT(x) is defined as ((x) << 3): 24 // https://github.com/NetBSD/src/blob/aba449a55bf91b44bc68f542edd9afa341962b89/sys/sys/mman.h#L73 25 mmapProt = mprotectProt << 3 26 } 27 b, err := unix.Mmap(-1, 0, unix.Getpagesize(), mmapProt, unix.MAP_ANON|unix.MAP_PRIVATE) 28 if err != nil { 29 t.Fatalf("Mmap: %v", err) 30 } 31 if err := unix.Mprotect(b, mprotectProt); err != nil { 32 t.Fatalf("Mprotect: %v", err) 33 } 34 35 b[0] = 42 36 37 if runtime.GOOS == "aix" { 38 t.Skip("msync returns invalid argument for AIX, skipping msync test") 39 } else { 40 if err := unix.Msync(b, unix.MS_SYNC); err != nil { 41 t.Fatalf("Msync: %v", err) 42 } 43 } 44 45 if err := unix.Madvise(b, unix.MADV_DONTNEED); err != nil { 46 t.Fatalf("Madvise: %v", err) 47 } 48 if err := unix.Munmap(b); err != nil { 49 t.Fatalf("Munmap: %v", err) 50 } 51 }