folly-clib-20250713.1537: folly/folly/io/async/test/SocketPair.cpp

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <folly/io/async/test/SocketPair.h>

#include <cerrno>
#include <stdexcept>

#include <folly/Conv.h>
#include <folly/net/NetOps.h>
#include <folly/portability/Fcntl.h>
#include <folly/portability/Sockets.h>
#include <folly/portability/Unistd.h>

namespace folly {

SocketPair::SocketPair(Mode mode) {
  if (netops::socketpair(PF_UNIX, SOCK_STREAM, 0, fds_) != 0) {
    throw std::runtime_error(folly::to<std::string>(
        "test::SocketPair: failed create socket pair", errno));
  }

  if (mode == NONBLOCKING) {
    if (netops::set_socket_non_blocking(fds_[0]) != 0) {
      throw std::runtime_error(folly::to<std::string>(
          "test::SocketPair: failed to set non-blocking "
          "read mode",
          errno));
    }
    if (netops::set_socket_non_blocking(fds_[1]) != 0) {
      throw std::runtime_error(folly::to<std::string>(
          "test::SocketPair: failed to set non-blocking "
          "write mode",
          errno));
    }
  }
}

SocketPair::~SocketPair() {
  closeFD0();
  closeFD1();
}

void SocketPair::closeFD0() {
  if (fds_[0] != NetworkSocket()) {
    netops::close(fds_[0]);
    fds_[0] = NetworkSocket();
  }
}

void SocketPair::closeFD1() {
  if (fds_[1] != NetworkSocket()) {
    netops::close(fds_[1]);
    fds_[1] = NetworkSocket();
  }
}

} // namespace folly