libc/test/src/sys/prctl/linux/prctl_test.cpp

//===-- Unittests for prctl -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/sys/prctl/prctl.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include <linux/prctl.h> // Definition of PR_* constants

using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
using LlvmLibcSysPrctlTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;

TEST_F(LlvmLibcSysPrctlTest, GetSetName) {
  ASSERT_THAT(LIBC_NAMESPACE::prctl(PR_GET_NAME, nullptr), Fails(EFAULT, -1));

  ASSERT_THAT(LIBC_NAMESPACE::prctl(PR_SET_NAME, "libc-test"), Succeeds());

  char name[17];
  ASSERT_THAT(LIBC_NAMESPACE::prctl(PR_GET_NAME, name), Succeeds());
  ASSERT_STREQ(name, "libc-test");
}

TEST_F(LlvmLibcSysPrctlTest, GetTHPDisable) {
  // Manually check errno since the return value logic here is not
  // covered in ErrnoSetterMatcher.
  // Note that PR_GET_THP_DISABLE is not supported by QEMU.
  int ret = LIBC_NAMESPACE::prctl(PR_GET_THP_DISABLE, 0, 0, 0, 0);
  ASSERT_ERRNO_SUCCESS();
  // PR_GET_THP_DISABLE return (as the function result) the current
  // setting of the "THP disable" flag for the calling thread, which
  // is either 1, if the flag is set; or 0, if it is not.
  ASSERT_TRUE(ret == 0 || ret == 1);
}