//===-- Unittests for sendto/recvfrom -------------------------------------===//
//
// 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/socket/recvfrom.h"
#include "src/sys/socket/sendto.h"
#include "src/sys/socket/socketpair.h"

#include "src/unistd/close.h"

#include "src/__support/CPP/scope.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"

#include <sys/socket.h> // For AF_UNIX and SOCK_DGRAM

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

TEST_F(LlvmLibcSendToRecvFromTest, SucceedsWithSocketPair) {
  const char TEST_MESSAGE[] = "connection successful";
  const size_t MESSAGE_LEN = sizeof(TEST_MESSAGE);

  int sockpair[2] = {0, 0};

  ASSERT_THAT(LIBC_NAMESPACE::socketpair(AF_UNIX, SOCK_STREAM, 0, sockpair),
              Succeeds(0));
  LIBC_NAMESPACE::cpp::scope_exit close_sockpair([&] {
    ASSERT_THAT(LIBC_NAMESPACE::close(sockpair[0]), Succeeds(0));
    ASSERT_THAT(LIBC_NAMESPACE::close(sockpair[1]), Succeeds(0));
  });

  ASSERT_THAT(LIBC_NAMESPACE::sendto(sockpair[0], TEST_MESSAGE, MESSAGE_LEN, 0,
                                     nullptr, 0),
              Succeeds(static_cast<ssize_t>(MESSAGE_LEN)));

  char buffer[256];

  ASSERT_THAT(LIBC_NAMESPACE::recvfrom(sockpair[1], buffer, sizeof(buffer), 0,
                                       nullptr, 0),
              Succeeds(static_cast<ssize_t>(MESSAGE_LEN)));

  ASSERT_STREQ(buffer, TEST_MESSAGE);
}

TEST_F(LlvmLibcSendToRecvFromTest, SendToFails) {
  const char TEST_MESSAGE[] = "connection terminated";
  const size_t MESSAGE_LEN = sizeof(TEST_MESSAGE);

  ASSERT_THAT(
      LIBC_NAMESPACE::sendto(-1, TEST_MESSAGE, MESSAGE_LEN, 0, nullptr, 0),
      Fails(EBADF, static_cast<ssize_t>(-1)));
}

TEST_F(LlvmLibcSendToRecvFromTest, RecvFromFails) {
  char buffer[256];

  ASSERT_THAT(
      LIBC_NAMESPACE::recvfrom(-1, buffer, sizeof(buffer), 0, nullptr, 0),
      Fails(EBADF, static_cast<ssize_t>(-1)));
}
