Mercurial > hg > CbC > CbC_gcc
view libgo/go/runtime/runtime_mmap_test.go @ 138:fc828634a951
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Thu, 08 Nov 2018 14:17:14 +0900 |
parents | 84e7813d76e9 |
children | 1830386684a0 |
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// 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. 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) } // 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) } }