【OpenHarmony】【2.3_Beta】【轻内核子系统】集成测试pread函数返回值与之前版本不一致
【测试版本】
hispark_taurus版本：
http://download.ci.openharmony.cn/version/Master_Version/OpenHarmony_2.3_Beta/20210721_011042/version-Master_Version-OpenHarmony_2.3_Beta-20210721_011042-hispark_taurus.tar.gz
【测试步骤】
1.Hi3516dv300板子烧写2.3_Beta版本，正常启动挂载成功
2.执行命令./HitsIoPosixTest.bin
【测试用例】
1./* *

• @tc.number SUB_KERNEL_IO_OTHER_1080

• @tc.name pread basic function test The input data is empty

• @tc.desc [C- SOFTWARE -0200]
  */
  HWTEST_F(IoTestExt, testPreadExt0200, Function | MediumTest | Level2)
  {
  int fd = 0;
  char buf[MAX_BUFFER_SIZE] = {0};
  int count = 128;
  int offset = 1;
  FILE *fp = nullptr;
  FOPEN_WRITE(fp);
  fputs("", fp);
  EXPECT_NE(fclose(fp), -1) << "> fclose fail, errno = " << errno;
  fp = nullptr;

  FOPEN_READ(fp);
  FILENO(fp);
  int ret = pread(fd, buf, count, offset);
  EXPECT_EQ(ret, 0);
  EXPECT_STREQ(buf, "");
  EXPECT_NE(fclose(fp), -1) << "> fclose fail, errno = " << errno;
  }
  2./* *

• @tc.number SUB_KERNEL_IO_OTHER_1120

• @tc.name pread basic function test The offset is greater than the number of bytes file

• @tc.desc [C- SOFTWARE -0200]
  */
  HWTEST_F(IoTestExt, testPreadExt0500, Function | MediumTest | Level2)
  {
  int fd = 0;
  char buf[MAX_BUFFER_SIZE] = {0};
  int count = 128;
  int offset = 12;
  FILE *fp = nullptr;
  FOPEN_WRITE(fp);
  fputs("123456789", fp);
  EXPECT_NE(fclose(fp), -1) << "> fclose fail, errno = " << errno;
  fp = nullptr;

  FOPEN_READ(fp);
  FILENO(fp);
  int ret = pread(fd, buf, count, offset);
  EXPECT_EQ(ret, 0);
  EXPECT_STREQ(buf, "");
  EXPECT_NE(fclose(fp), -1) << "> fclose fail, errno = " << errno;
  }
  【测试log】
  [ RUN ] IoTestExt.testPreadExt0200

../../../test/xts/huawei_proprietary/hits/kernel_lite/io_posix/src/IoTestOtherExt1.cpp:63: Failure

Expected equality of these values:

ret

Which is: -1

0

[ FAILED ] IoTestExt.testPreadExt0200 (12 ms)

[ RUN ] IoTestExt.testPreadExt0500

../../../test/xts/huawei_proprietary/hits/kernel_lite/io_posix/src/IoTestOtherExt1.cpp:138: Failure

Expected equality of these values:

ret

Which is: -1

0

[ FAILED ] IoTestExt.testPreadExt0500 (7 ms)