From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:19:13 +0200 Subject: Adding upstream version 1.21.8. Signed-off-by: Daniel Baumann --- src/runtime/runtime_mmap_test.go | 53 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/runtime/runtime_mmap_test.go (limited to 'src/runtime/runtime_mmap_test.go') diff --git a/src/runtime/runtime_mmap_test.go b/src/runtime/runtime_mmap_test.go new file mode 100644 index 0000000..456f913 --- /dev/null +++ b/src/runtime/runtime_mmap_test.go @@ -0,0 +1,53 @@ +// Copyright 2016 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 unix + +package runtime_test + +import ( + "runtime" + "testing" + "unsafe" +) + +// Test that the error value returned by mmap is positive, as that is +// what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects. +// See the uses of ENOMEM in sysMap in those files. +func TestMmapErrorSign(t *testing.T) { + p, err := runtime.Mmap(nil, ^uintptr(0)&^(runtime.GetPhysPageSize()-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0) + + if p != nil || err != runtime.ENOMEM { + t.Errorf("mmap = %v, %v, want nil, %v", p, err, runtime.ENOMEM) + } +} + +func TestPhysPageSize(t *testing.T) { + // Mmap fails if the address is not page aligned, so we can + // use this to test if the page size is the true page size. + ps := runtime.GetPhysPageSize() + + // Get a region of memory to play with. This should be page-aligned. + b, err := runtime.Mmap(nil, 2*ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0) + if err != 0 { + t.Fatalf("Mmap: %v", err) + } + + if runtime.GOOS == "aix" { + // AIX does not allow mapping a range that is already mapped. + runtime.Munmap(unsafe.Pointer(uintptr(b)), 2*ps) + } + + // Mmap should fail at a half page into the buffer. + _, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps/2), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0) + if err == 0 { + t.Errorf("Mmap should have failed with half-page alignment %d, but succeeded: %v", ps/2, err) + } + + // Mmap should succeed at a full page into the buffer. + _, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0) + if err != 0 { + t.Errorf("Mmap at full-page alignment %d failed: %v", ps, err) + } +} -- cgit v1.2.3