Adding upstream version 1.65.7.

Signed-off-by: Daniel Baumann <daniel@debian.org>

unix_test.go

@@ -0,0 +1,45 @@
+// Copyright 2023 The Libc 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
+// +build unix
+
+package libc // import "modernc.org/libc"
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+// https://gitlab.com/cznic/libc/-/issues/29
+func TestIssue29(t *testing.T) {
+	dir := t.TempDir()
+
+	fn := filepath.Join(dir, "test")
+	if err := os.WriteFile(fn, make([]byte, 1<<20), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := os.OpenFile(fn, os.O_RDWR, 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer f.Close()
+
+	tls := NewTLS()
+	defer tls.Close()
+	d := Xmmap(tls, 0, 4096, unix.PROT_READ|unix.PROT_WRITE, unix.MAP_SHARED, int32(f.Fd()), 0)
+	if d == 0 {
+		t.Fatal("mmap failed")
+	}
+
+	t.Logf("%#0x", d)
+	if rc := Xmunmap(tls, d, 4096); rc != 0 {
+		t.Fatalf("munmap failed: %v", rc)
+	}
+}