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bdeccf8844
Stockfish apparently cannot handle non-blocking I/O, and it does not make sense to assume that all chess engines can do so. Fixes #18946.
98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2023, Tim Ledbetter <timledbetter@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Engine.h"
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <unistd.h>
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Engine::~Engine()
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{
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quit();
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}
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Engine::Engine(StringView command)
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: m_command(command)
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{
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connect_to_engine_service();
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}
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void Engine::connect_to_engine_service()
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{
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int wpipefds[2];
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int rpipefds[2];
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if (pipe2(wpipefds, O_CLOEXEC) < 0) {
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perror("pipe2");
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VERIFY_NOT_REACHED();
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}
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if (pipe2(rpipefds, O_CLOEXEC) < 0) {
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perror("pipe2");
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VERIFY_NOT_REACHED();
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}
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posix_spawn_file_actions_t file_actions;
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posix_spawn_file_actions_init(&file_actions);
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posix_spawn_file_actions_adddup2(&file_actions, wpipefds[0], STDIN_FILENO);
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posix_spawn_file_actions_adddup2(&file_actions, rpipefds[1], STDOUT_FILENO);
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char const* argv[] = { m_command.characters(), nullptr };
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pid_t pid = -1;
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if (posix_spawnp(&pid, m_command.characters(), &file_actions, nullptr, const_cast<char**>(argv), environ) < 0) {
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perror("posix_spawnp");
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VERIFY_NOT_REACHED();
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}
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posix_spawn_file_actions_destroy(&file_actions);
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close(wpipefds[0]);
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close(rpipefds[1]);
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auto infile = Core::File::adopt_fd(rpipefds[0], Core::File::OpenMode::Read).release_value_but_fixme_should_propagate_errors();
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infile->set_blocking(false).release_value_but_fixme_should_propagate_errors();
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set_in(move(infile)).release_value_but_fixme_should_propagate_errors();
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auto outfile = Core::File::adopt_fd(wpipefds[1], Core::File::OpenMode::Write).release_value_but_fixme_should_propagate_errors();
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outfile->set_blocking(false).release_value_but_fixme_should_propagate_errors();
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set_out(move(outfile));
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send_command(Chess::UCI::UCICommand());
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m_connected = true;
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}
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void Engine::handle_bestmove(Chess::UCI::BestMoveCommand const& command)
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{
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if (m_bestmove_callback)
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m_bestmove_callback(command.move());
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m_bestmove_callback = nullptr;
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}
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void Engine::quit()
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{
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if (!m_connected)
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return;
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send_command(Chess::UCI::QuitCommand());
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m_connected = false;
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}
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void Engine::handle_unexpected_eof()
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{
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m_connected = false;
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if (m_bestmove_callback)
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m_bestmove_callback(Error::from_errno(EPIPE));
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m_bestmove_callback = nullptr;
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if (on_connection_lost)
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on_connection_lost();
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}
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