github.com/bytedance/mockey@v1.2.10/internal/monkey/mem/write_linux_test.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package mem
    18  
    19  import (
    20  	"fmt"
    21  	"syscall"
    22  	"testing"
    23  	"unsafe"
    24  
    25  	"github.com/bytedance/mockey/internal/monkey/common"
    26  	"github.com/smartystreets/goconvey/convey"
    27  )
    28  
    29  func Test_write(t *testing.T) {
    30  	convey.Convey("Test_write", t, func() {
    31  		var a uint16 = 0x0
    32  		var b uint32 = 0xffffffff
    33  		fmt.Printf("a=%x,b=%x\n", a, b)
    34  		arr := (*[4]byte)(unsafe.Pointer(&a))
    35  		arr[2] = 0xa5
    36  		fmt.Printf("a=%x,b=%x,aSlice=%x\n", a, b, arr)
    37  		target := uintptr(unsafe.Pointer(&a))
    38  		data := uintptr(unsafe.Pointer(&b))
    39  		res := write(target, data, 3, common.PageOf(target), common.PageSize(), syscall.PROT_READ|syscall.PROT_WRITE)
    40  		convey.So(res, convey.ShouldEqual, 0)
    41  		fmt.Printf("a=%x,b=%x,aSlice=%x\n", a, b, arr)
    42  		convey.So(a, convey.ShouldEqual, 0xffff)
    43  		convey.So(b, convey.ShouldEqual, 0xffffffff)
    44  		convey.So(*arr, convey.ShouldResemble, [4]byte{0xff, 0xff, 0xff, 0x00})
    45  	})
    46  }