github.com/miolini/go@v0.0.0-20160405192216-fca68c8cb408/src/runtime/runtime_mmap_test.go (about)

     1  // Copyright 2016 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  // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
     6  
     7  package runtime_test
     8  
     9  import (
    10  	"runtime"
    11  	"runtime/internal/sys"
    12  	"testing"
    13  )
    14  
    15  // Test that the error value returned by mmap is positive, as that is
    16  // what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects.
    17  // See the uses of ENOMEM in sysMap in those files.
    18  func TestMmapErrorSign(t *testing.T) {
    19  	p := runtime.Mmap(nil, ^uintptr(0)&^(sys.PhysPageSize-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
    20  
    21  	// The runtime.mmap function is nosplit, but t.Errorf is not.
    22  	// Reset the pointer so that we don't get an "invalid stack
    23  	// pointer" error from t.Errorf if we call it.
    24  	v := uintptr(p)
    25  	p = nil
    26  
    27  	if v != runtime.ENOMEM {
    28  		t.Errorf("mmap = %v, want %v", v, runtime.ENOMEM)
    29  	}
    30  }