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Chess+ChessEngine: Fix stockfish by setting correct blocking flag

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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.
This commit is contained in:
Ben Wiederhake 2023-05-21 22:27:01 +02:00 • committed by Andreas Kling
parent 62ebb78433
commit bdeccf8844
2 changed files with 10 additions and 3 deletions
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7
Userland/Games/Chess/Engine.cpp
View file

@ -7,6 +7,7 @@
#include "Engine.h"
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdio.h>
@ -27,12 +28,12 @@ void Engine::connect_to_engine_service()
{
int wpipefds[2];
int rpipefds[2];
if (pipe2(wpipefds, O_CLOEXEC | O_NONBLOCK) < 0) {
if (pipe2(wpipefds, O_CLOEXEC) < 0) {
perror("pipe2");
VERIFY_NOT_REACHED();
}
if (pipe2(rpipefds, O_CLOEXEC | O_NONBLOCK) < 0) {
if (pipe2(rpipefds, O_CLOEXEC) < 0) {
perror("pipe2");
VERIFY_NOT_REACHED();
}
@ -55,9 +56,11 @@ void Engine::connect_to_engine_service()
close(rpipefds[1]);
auto infile = Core::File::adopt_fd(rpipefds[0], Core::File::OpenMode::Read).release_value_but_fixme_should_propagate_errors();
infile->set_blocking(false).release_value_but_fixme_should_propagate_errors();
set_in(move(infile)).release_value_but_fixme_should_propagate_errors();
auto outfile = Core::File::adopt_fd(wpipefds[1], Core::File::OpenMode::Write).release_value_but_fixme_should_propagate_errors();
outfile->set_blocking(false).release_value_but_fixme_should_propagate_errors();
set_out(move(outfile));
send_command(Chess::UCI::UCICommand());

6
Userland/Services/ChessEngine/main.cpp
View file

@ -16,7 +16,11 @@ ErrorOr<int> serenity_main(Main::Arguments)
Core::EventLoop loop;
TRY(Core::System::unveil(nullptr, nullptr));
auto engine = TRY(ChessEngine::try_create(TRY(Core::File::standard_input()), TRY(Core::File::standard_output())));
auto infile = TRY(Core::File::standard_input());
TRY(infile->set_blocking(false));
auto outfile = TRY(Core::File::standard_output());
TRY(outfile->set_blocking(false));
auto engine = TRY(ChessEngine::try_create(move(infile), move(outfile)));
engine->on_quit = [&](auto status_code) {
loop.quit(status_code);
};