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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/impl/socket_handle_waiter_posix.h"
#include <time.h>
#include <algorithm>
#include <vector>
#include "platform/base/error.h"
#include "platform/impl/socket_handle_posix.h"
#include "platform/impl/timeval_posix.h"
#include "platform/impl/udp_socket_posix.h"
#include "util/logging.h"
namespace openscreen {
namespace platform {
SocketHandleWaiterPosix::SocketHandleWaiterPosix() = default;
SocketHandleWaiterPosix::~SocketHandleWaiterPosix() = default;
ErrorOr<std::vector<SocketHandleWaiterPosix::SocketHandleRef>>
SocketHandleWaiterPosix::AwaitSocketsReadable(
const std::vector<SocketHandleRef>& socket_handles,
const Clock::duration& timeout) {
int max_fd = -1;
FD_ZERO(&read_handles_);
for (const SocketHandle& handle : socket_handles) {
FD_SET(handle.fd, &read_handles_);
max_fd = std::max(max_fd, handle.fd);
}
if (max_fd < 0) {
return Error::Code::kIOFailure;
}
struct timeval tv = ToTimeval(timeout);
// This value is set to 'max_fd + 1' by convention. For more information, see:
// http://man7.org/linux/man-pages/man2/select.2.html
int max_fd_to_watch = max_fd + 1;
const int rv = select(max_fd_to_watch, &read_handles_, nullptr, nullptr, &tv);
if (rv == -1) {
// This is the case when an error condition is hit within the select(...)
// command.
return Error::Code::kIOFailure;
} else if (rv == 0) {
// This occurs when no sockets have a pending read.
return Error::Code::kAgain;
}
std::vector<SocketHandleRef> changed_handles;
for (const SocketHandleRef& handle : socket_handles) {
if (FD_ISSET(handle.get().fd, &read_handles_)) {
changed_handles.push_back(handle);
}
}
return changed_handles;
}
void SocketHandleWaiterPosix::RunUntilStopped() {
const bool was_running = is_running_.exchange(true);
OSP_CHECK(!was_running);
constexpr Clock::duration kHandleReadyTimeout = std::chrono::milliseconds(50);
while (is_running_) {
ProcessHandles(kHandleReadyTimeout);
}
}
void SocketHandleWaiterPosix::RequestStopSoon() {
is_running_.store(false);
}
} // namespace platform
} // namespace openscreen
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