mirror of git://gcc.gnu.org/git/gcc.git
54 lines
1.9 KiB
Go
54 lines
1.9 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import (
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"runtime"
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"testing"
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"unsafe"
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)
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// Test that the error value returned by mmap is positive, as that is
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// what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects.
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// See the uses of ENOMEM in sysMap in those files.
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func TestMmapErrorSign(t *testing.T) {
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p := runtime.Mmap(nil, ^uintptr(0)&^(runtime.GetPhysPageSize()-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
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// The runtime.mmap function is nosplit, but t.Errorf is not.
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// Reset the pointer so that we don't get an "invalid stack
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// pointer" error from t.Errorf if we call it.
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v := uintptr(p)
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p = nil
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err := runtime.Errno()
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if v != ^uintptr(0) || err != runtime.ENOMEM {
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t.Errorf("mmap = %v, %v, want %v", v, err, runtime.ENOMEM)
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}
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}
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func TestPhysPageSize(t *testing.T) {
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// Mmap fails if the address is not page aligned, so we can
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// use this to test if the page size is the true page size.
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ps := runtime.GetPhysPageSize()
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// Get a region of memory to play with. This should be page-aligned.
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b := uintptr(runtime.Mmap(nil, 2*ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0))
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if b == ^uintptr(0) {
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t.Fatalf("Mmap: %v %v", b, runtime.Errno())
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}
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// Mmap should fail at a half page into the buffer.
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err := uintptr(runtime.Mmap(unsafe.Pointer(uintptr(b)+ps/2), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0))
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if err != ^uintptr(0) {
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t.Errorf("Mmap should have failed with half-page alignment %d, but succeeded: %v", ps/2, err)
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}
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// Mmap should succeed at a full page into the buffer.
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err = uintptr(runtime.Mmap(unsafe.Pointer(uintptr(b)+ps), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0))
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if err == ^uintptr(0) {
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t.Errorf("Mmap at full-page alignment %d failed: %v %v", ps, err, runtime.Errno())
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}
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}
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