diff options
Diffstat (limited to 'src/io/io_unix.cpp')
| -rw-r--r-- | src/io/io_unix.cpp | 895 |
1 files changed, 895 insertions, 0 deletions
diff --git a/src/io/io_unix.cpp b/src/io/io_unix.cpp new file mode 100644 index 0000000..b5f17e5 --- /dev/null +++ b/src/io/io_unix.cpp @@ -0,0 +1,895 @@ +#ifdef SAW_UNIX + +#include <csignal> +#include <sys/signalfd.h> + +#include <fcntl.h> +#include <netdb.h> +#include <netinet/in.h> +#include <sys/epoll.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/un.h> + +#include <cassert> +#include <cstring> + +#include <errno.h> +#include <unistd.h> + +#include <queue> +#include <sstream> +#include <unordered_map> +#include <vector> + +#include "io.h" + +namespace saw { +namespace unix { +constexpr int MAX_EPOLL_EVENTS = 256; + +class unix_event_port; +class i_fd_owner { +protected: + unix_event_port &event_port_; + +private: + int file_descriptor_; + int fd_flags_; + uint32_t event_mask_; + +public: + i_fd_owner(unix_event_port &event_port, int file_descriptor, int fd_flags, + uint32_t event_mask); + + virtual ~i_fd_owner(); + + virtual void notify(uint32_t mask) = 0; + + int fd() const { return file_descriptor_; } +}; + +class unix_event_port final : public event_port { +private: + int epoll_fd_; + int signal_fd_; + + sigset_t signal_fd_set_; + + std::unordered_multimap<Signal, own<conveyor_feeder<void>>> + signal_conveyors_; + + int pipefds_[2]; + + std::vector<int> to_unix_signal(Signal signal) const { + switch (signal) { + case Signal::User1: + return {SIGUSR1}; + case Signal::Terminate: + default: + return {SIGTERM, SIGQUIT, SIGINT}; + } + } + + Signal from_unix_signal(int signal) const { + switch (signal) { + case SIGUSR1: + return Signal::User1; + case SIGTERM: + case SIGINT: + case SIGQUIT: + default: + return Signal::Terminate; + } + } + + void notify_signal_listener(int sig) { + Signal signal = from_unix_signal(sig); + + auto equal_range = signal_conveyors_.equal_range(signal); + for (auto iter = equal_range.first; iter != equal_range.second; + ++iter) { + + if (iter->second) { + if (iter->second->space() > 0) { + iter->second->feed(); + } + } + } + } + + bool poll_impl(int time) { + epoll_event events[MAX_EPOLL_EVENTS]; + int nfds = 0; + do { + nfds = epoll_wait(epoll_fd_, events, MAX_EPOLL_EVENTS, time); + + if (nfds < 0) { + /// @todo error_handling + return false; + } + + for (int i = 0; i < nfds; ++i) { + if (events[i].data.u64 == 0) { + while (1) { + struct ::signalfd_siginfo siginfo; + ssize_t n = + ::read(signal_fd_, &siginfo, sizeof(siginfo)); + if (n < 0) { + break; + } + assert(n == sizeof(siginfo)); + + notify_signal_listener(siginfo.ssi_signo); + } + } else if (events[i].data.u64 == 1) { + uint8_t i; + if (pipefds_[0] < 0) { + continue; + } + while (1) { + ssize_t n = ::recv(pipefds_[0], &i, sizeof(i), 0); + if (n < 0) { + break; + } + } + } else { + i_fd_owner *owner = + reinterpret_cast<i_fd_owner *>(events[i].data.ptr); + if (owner) { + owner->notify(events[i].events); + } + } + } + } while (nfds == MAX_EPOLL_EVENTS); + + return true; + } + +public: + unix_event_port() : epoll_fd_{-1}, signal_fd_{-1} { + ::signal(SIGPIPE, SIG_IGN); + + epoll_fd_ = ::epoll_create1(EPOLL_CLOEXEC); + if (epoll_fd_ < 0) { + return; + } + + ::sigemptyset(&signal_fd_set_); + signal_fd_ = + ::signalfd(-1, &signal_fd_set_, SFD_NONBLOCK | SFD_CLOEXEC); + if (signal_fd_ < 0) { + return; + } + + struct epoll_event event; + memset(&event, 0, sizeof(event)); + event.events = EPOLLIN; + event.data.u64 = 0; + ::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, signal_fd_, &event); + + int rc = ::pipe2(pipefds_, O_NONBLOCK | O_CLOEXEC); + if (rc < 0) { + return; + } + memset(&event, 0, sizeof(event)); + event.events = EPOLLIN; + event.data.u64 = 1; + ::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, pipefds_[0], &event); + } + + ~unix_event_port() { + ::close(epoll_fd_); + ::close(signal_fd_); + ::close(pipefds_[0]); + ::close(pipefds_[1]); + } + + conveyor<void> on_signal(Signal signal) override { + auto caf = new_conveyor_and_feeder<void>(); + + signal_conveyors_.insert(std::make_pair(signal, std::move(caf.feeder))); + + std::vector<int> sig = to_unix_signal(signal); + + for (auto iter = sig.begin(); iter != sig.end(); ++iter) { + ::sigaddset(&signal_fd_set_, *iter); + } + ::sigprocmask(SIG_BLOCK, &signal_fd_set_, nullptr); + ::signalfd(signal_fd_, &signal_fd_set_, SFD_NONBLOCK | SFD_CLOEXEC); + + auto node = conveyor<void>::from_conveyor(std::move(caf.conveyor)); + return conveyor<void>::to_conveyor(std::move(node)); + } + + void poll() override { poll_impl(0); } + + void wait() override { poll_impl(-1); } + + void wait(const std::chrono::steady_clock::duration &duration) override { + poll_impl( + std::chrono::duration_cast<std::chrono::milliseconds>(duration) + .count()); + } + void + wait(const std::chrono::steady_clock::time_point &time_point) override { + auto now = std::chrono::steady_clock::now(); + if (time_point <= now) { + poll(); + } else { + poll_impl(std::chrono::duration_cast<std::chrono::milliseconds>( + time_point - now) + .count()); + } + } + + void wake() override { + /// @todo pipe() in the beginning and write something minor into it like + /// uint8_t or sth the value itself doesn't matter + if (pipefds_[1] < 0) { + return; + } + uint8_t i = 0; + ::send(pipefds_[1], &i, sizeof(i), MSG_DONTWAIT); + } + + void subscribe(i_fd_owner &owner, int fd, uint32_t event_mask) { + if (epoll_fd_ < 0 || fd < 0) { + return; + } + ::epoll_event event; + memset(&event, 0, sizeof(event)); + event.events = event_mask | EPOLLET; + event.data.ptr = &owner; + + if (::epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &event) < 0) { + /// @todo error_handling + return; + } + } + + void unsubscribe(int fd) { + if (epoll_fd_ < 0 || fd < 0) { + return; + } + if (::epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr) < 0) { + /// @todo error_handling + return; + } + } +}; + +ssize_t unix_read(int fd, void *buffer, size_t length); +ssize_t unix_write(int fd, const void *buffer, size_t length); + +class unix_io_stream final : public io_stream, public i_fd_owner { +private: + own<conveyor_feeder<void>> read_ready_ = nullptr; + own<conveyor_feeder<void>> on_read_disconnect_ = nullptr; + own<conveyor_feeder<void>> write_ready_ = nullptr; + +public: + unix_io_stream(unix_event_port &event_port, int file_descriptor, + int fd_flags, uint32_t event_mask); + + error_or<size_t> read(void *buffer, size_t length) override; + + conveyor<void> read_ready() override; + + conveyor<void> on_read_disconnected() override; + + error_or<size_t> write(const void *buffer, size_t length) override; + + conveyor<void> write_ready() override; + + /* + void read(void *buffer, size_t min_length, size_t max_length) override; + Conveyor<size_t> readDone() override; + Conveyor<void> readReady() override; + + Conveyor<void> onReadDisconnected() override; + + void write(const void *buffer, size_t length) override; + Conveyor<size_t> writeDone() override; + Conveyor<void> writeReady() override; + */ + + void notify(uint32_t mask) override; +}; + +class unix_server final : public server, public i_fd_owner { +private: + own<conveyor_feeder<own<io_stream>>> accept_feeder_ = nullptr; + +public: + unix_server(unix_event_port &event_port, int file_descriptor, int fd_flags); + + conveyor<own<io_stream>> accept() override; + + void notify(uint32_t mask) override; +}; + +class unix_datagram final : public datagram, public i_fd_owner { +private: + own<conveyor_feeder<void>> read_ready_ = nullptr; + own<conveyor_feeder<void>> write_ready_ = nullptr; + +public: + unix_datagram(unix_event_port &event_port, int file_descriptor, + int fd_flags); + + error_or<size_t> read(void *buffer, size_t length) override; + conveyor<void> read_ready() override; + + error_or<size_t> write(const void *buffer, size_t length, + network_address &dest) override; + conveyor<void> write_ready() override; + + void notify(uint32_t mask) override; +}; + +/** + * Helper class which provides potential addresses to NetworkAddress + */ +class socket_address { +private: + union { + struct sockaddr generic; + struct sockaddr_un unix; + struct sockaddr_in inet; + struct sockaddr_in6 inet6; + struct sockaddr_storage storage; + } address_; + + socklen_t address_length_; + bool wildcard_; + + socket_address() : wildcard_{false} {} + +public: + socket_address(const void *sockaddr, socklen_t len, bool wildcard) + : address_length_{len}, wildcard_{wildcard} { + assert(len <= sizeof(address_)); + memcpy(&address_.generic, sockaddr, len); + } + + int socket(int type) const { + type |= SOCK_NONBLOCK | SOCK_CLOEXEC; + + int result = ::socket(address_.generic.sa_family, type, 0); + return result; + } + + bool bind(int fd) const { + if (wildcard_) { + int value = 0; + ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &value, sizeof(value)); + } + int error = ::bind(fd, &address_.generic, address_length_); + return error < 0; + } + + struct ::sockaddr *get_raw() { + return &address_.generic; + } + + const struct ::sockaddr *get_raw() const { return &address_.generic; } + + socklen_t get_raw_length() const { return address_length_; } + + static std::vector<socket_address> resolve(std::string_view str, + uint16_t port_hint) { + std::vector<socket_address> results; + + struct ::addrinfo *head; + struct ::addrinfo hints; + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + + std::string port_string = std::to_string(port_hint); + bool wildcard = str == "*" || str == "::"; + std::string address_string{str}; + + int error = ::getaddrinfo(address_string.c_str(), port_string.c_str(), + &hints, &head); + + if (error) { + return {}; + } + + for (struct ::addrinfo *it = head; it != nullptr; it = it->ai_next) { + if (it->ai_addrlen > sizeof(socket_address::address_)) { + continue; + } + results.push_back({it->ai_addr, it->ai_addrlen, wildcard}); + } + ::freeaddrinfo(head); + return results; + } +}; + +class unix_network_address final : public os_network_address { +private: + const std::string path_; + uint16_t port_hint_; + std::vector<socket_address> addresses_; + +public: + unix_network_address(const std::string &path, uint16_t port_hint, + std::vector<socket_address> &&addr) + : path_{path}, port_hint_{port_hint}, addresses_{std::move(addr)} {} + + const std::string &address() const override; + + uint16_t port() const override; + + // Custom address info + socket_address &unix_address(size_t i = 0); + size_t unix_address_size() const; +}; + +class unix_network final : public network { +private: + unix_event_port &event_port_; + +public: + unix_network(unix_event_port &event_port); + + conveyor<own<network_address>> + resolve_address(const std::string &address, + uint16_t port_hint = 0) override; + + own<server> listen(network_address &addr) override; + + conveyor<own<io_stream>> connect(network_address &addr) override; + + own<class datagram> datagram(network_address &addr) override; +}; + +class unix_io_provider final : public io_provider { +private: + unix_event_port &event_port_; + class event_loop event_loop_; + + unix_network unix_network_; + +public: + unix_io_provider(unix_event_port &port_ref, own<event_port> port); + + class network &network() override; + + own<input_stream> wrap_input_fd(int fd) override; + + class event_loop &event_loop(); +}; + +i_fd_owner::i_fd_owner(unix_event_port &event_port, int file_descriptor, + int fd_flags, uint32_t event_mask) + : event_port_{event_port}, file_descriptor_{file_descriptor}, + fd_flags_{fd_flags}, event_mask_{event_mask} { + event_port_.subscribe(*this, file_descriptor, event_mask); +} + +i_fd_owner::~i_fd_owner() { + if (file_descriptor_ >= 0) { + event_port_.unsubscribe(file_descriptor_); + ::close(file_descriptor_); + } +} + +ssize_t unix_read(int fd, void *buffer, size_t length) { + return ::recv(fd, buffer, length, 0); +} + +ssize_t unix_write(int fd, const void *buffer, size_t length) { + return ::send(fd, buffer, length, 0); +} + +unix_io_stream::unix_io_stream(unix_event_port &event_port, int file_descriptor, + int fd_flags, uint32_t event_mask) + : i_fd_owner{event_port, file_descriptor, fd_flags, + event_mask | EPOLLRDHUP} {} + +error_or<size_t> unix_io_stream::read(void *buffer, size_t length) { + ssize_t read_bytes = unix_read(fd(), buffer, length); + if (read_bytes > 0) { + return static_cast<size_t>(read_bytes); + } else if (read_bytes == 0) { + return critical_error("Disconnected", error::code::Disconnected); + } + + return recoverable_error("Currently busy"); +} + +conveyor<void> unix_io_stream::read_ready() { + auto caf = new_conveyor_and_feeder<void>(); + read_ready_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +conveyor<void> unix_io_stream::on_read_disconnected() { + auto caf = new_conveyor_and_feeder<void>(); + on_read_disconnect_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +error_or<size_t> unix_io_stream::write(const void *buffer, size_t length) { + ssize_t write_bytes = unix_write(fd(), buffer, length); + if (write_bytes > 0) { + return static_cast<size_t>(write_bytes); + } + + int error = errno; + + if (error == EAGAIN || error == EWOULDBLOCK) { + return recoverable_error("Currently busy"); + } + + return critical_error("Disconnected", error::code::Disconnected); +} + +conveyor<void> unix_io_stream::write_ready() { + auto caf = new_conveyor_and_feeder<void>(); + write_ready_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +void unix_io_stream::notify(uint32_t mask) { + if (mask & EPOLLOUT) { + if (write_ready_) { + write_ready_->feed(); + } + } + + if (mask & EPOLLIN) { + if (read_ready_) { + read_ready_->feed(); + } + } + + if (mask & EPOLLRDHUP) { + if (on_read_disconnect_) { + on_read_disconnect_->feed(); + } + } +} + +unix_server::unix_server(unix_event_port &event_port, int file_descriptor, + int fd_flags) + : i_fd_owner{event_port, file_descriptor, fd_flags, EPOLLIN} {} + +conveyor<own<io_stream>> unix_server::accept() { + auto caf = new_conveyor_and_feeder<own<io_stream>>(); + accept_feeder_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +void unix_server::notify(uint32_t mask) { + if (mask & EPOLLIN) { + if (accept_feeder_) { + struct ::sockaddr_storage address; + socklen_t address_length = sizeof(address); + + int accept_fd = + ::accept4(fd(), reinterpret_cast<struct ::sockaddr *>(&address), + &address_length, SOCK_NONBLOCK | SOCK_CLOEXEC); + if (accept_fd < 0) { + return; + } + auto fd_stream = heap<unix_io_stream>(event_port_, accept_fd, 0, + EPOLLIN | EPOLLOUT); + accept_feeder_->feed(std::move(fd_stream)); + } + } +} + +unix_datagram::unix_datagram(unix_event_port &event_port, int file_descriptor, + int fd_flags) + : i_fd_owner{event_port, file_descriptor, fd_flags, EPOLLIN | EPOLLOUT} {} + +namespace { +ssize_t unix_read_msg(int fd, void *buffer, size_t length) { + struct ::sockaddr_storage their_addr; + socklen_t addr_len = sizeof(sockaddr_storage); + return ::recvfrom(fd, buffer, length, 0, + reinterpret_cast<struct ::sockaddr *>(&their_addr), + &addr_len); +} + +ssize_t unix_write_msg(int fd, const void *buffer, size_t length, + ::sockaddr *dest_addr, socklen_t dest_addr_len) { + + return ::sendto(fd, buffer, length, 0, dest_addr, dest_addr_len); +} +} // namespace + +error_or<size_t> unix_datagram::read(void *buffer, size_t length) { + ssize_t read_bytes = unix_read_msg(fd(), buffer, length); + if (read_bytes > 0) { + return static_cast<size_t>(read_bytes); + } + return recoverable_error("Currently busy"); +} + +conveyor<void> unix_datagram::read_ready() { + auto caf = new_conveyor_and_feeder<void>(); + read_ready_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +error_or<size_t> unix_datagram::write(const void *buffer, size_t length, + network_address &dest) { + unix_network_address &unix_dest = static_cast<unix_network_address &>(dest); + socket_address &sock_addr = unix_dest.unix_address(); + socklen_t sock_addr_length = sock_addr.get_raw_length(); + ssize_t write_bytes = unix_write_msg(fd(), buffer, length, + sock_addr.get_raw(), sock_addr_length); + if (write_bytes > 0) { + return static_cast<size_t>(write_bytes); + } + return recoverable_error("Currently busy"); +} + +conveyor<void> unix_datagram::write_ready() { + auto caf = new_conveyor_and_feeder<void>(); + write_ready_ = std::move(caf.feeder); + return std::move(caf.conveyor); +} + +void unix_datagram::notify(uint32_t mask) { + if (mask & EPOLLOUT) { + if (write_ready_) { + write_ready_->feed(); + } + } + + if (mask & EPOLLIN) { + if (read_ready_) { + read_ready_->feed(); + } + } +} + +namespace { +bool begins_with(const std::string_view &viewed, + const std::string_view &begins) { + return viewed.size() >= begins.size() && + viewed.compare(0, begins.size(), begins) == 0; +} + +std::variant<unix_network_address, unix_network_address *> +translate_network_address_to_unix_network_address(network_address &addr) { + auto addr_variant = addr.representation(); + std::variant<unix_network_address, unix_network_address *> os_addr = + std::visit( + [](auto &arg) + -> std::variant<unix_network_address, unix_network_address *> { + using T = std::decay_t<decltype(arg)>; + + if constexpr (std::is_same_v<T, os_network_address *>) { + return static_cast<unix_network_address *>(arg); + } + + auto sock_addrs = socket_address::resolve( + std::string_view{arg->address()}, arg->port()); + + return unix_network_address{arg->address(), arg->port(), + std::move(sock_addrs)}; + }, + addr_variant); + return os_addr; +} + +unix_network_address &translate_to_unix_address_ref( + std::variant<unix_network_address, unix_network_address *> &addr_variant) { + return std::visit( + [](auto &arg) -> unix_network_address & { + using T = std::decay_t<decltype(arg)>; + + if constexpr (std::is_same_v<T, unix_network_address>) { + return arg; + } else if constexpr (std::is_same_v<T, unix_network_address *>) { + return *arg; + } else { + static_assert(true, "Cases exhausted"); + } + }, + addr_variant); +} + +} // namespace + +own<server> unix_network::listen(network_address &addr) { + auto unix_addr_storage = + translate_network_address_to_unix_network_address(addr); + unix_network_address &address = + translate_to_unix_address_ref(unix_addr_storage); + + assert(address.unix_address_size() > 0); + if (address.unix_address_size() == 0) { + return nullptr; + } + + int fd = address.unix_address(0).socket(SOCK_STREAM); + if (fd < 0) { + return nullptr; + } + + int val = 1; + int rc = ::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); + if (rc < 0) { + ::close(fd); + return nullptr; + } + + bool failed = address.unix_address(0).bind(fd); + if (failed) { + ::close(fd); + return nullptr; + } + + ::listen(fd, SOMAXCONN); + + return heap<unix_server>(event_port_, fd, 0); +} + +conveyor<own<io_stream>> unix_network::connect(network_address &addr) { + auto unix_addr_storage = + translate_network_address_to_unix_network_address(addr); + unix_network_address &address = + translate_to_unix_address_ref(unix_addr_storage); + + assert(address.unix_address_size() > 0); + if (address.unix_address_size() == 0) { + return conveyor<own<io_stream>>{critical_error("No address found")}; + } + + int fd = address.unix_address(0).socket(SOCK_STREAM); + if (fd < 0) { + return conveyor<own<io_stream>>{critical_error("Couldn't open socket")}; + } + + own<unix_io_stream> io_str = + heap<unix_io_stream>(event_port_, fd, 0, EPOLLIN | EPOLLOUT); + + bool success = false; + for (size_t i = 0; i < address.unix_address_size(); ++i) { + socket_address &addr_iter = address.unix_address(i); + int status = + ::connect(fd, addr_iter.get_raw(), addr_iter.get_raw_length()); + if (status < 0) { + int error = errno; + /* + * It's not connected yet... + * But edge triggered epolling means that it'll + * be ready when the signal is triggered + */ + + /// @todo Add limit node when implemented + if (error == EINPROGRESS) { + /* + Conveyor<void> write_ready = io_stream->writeReady(); + return write_ready.then( + [ios{std::move(io_stream)}]() mutable { + ios->write_ready = nullptr; + return std::move(ios); + }); + */ + success = true; + break; + } else if (error != EINTR) { + /// @todo Push error message from + return conveyor<own<io_stream>>{ + critical_error("Couldn't connect")}; + } + } else { + success = true; + break; + } + } + + if (!success) { + return critical_error("Couldn't connect"); + } + + return conveyor<own<io_stream>>{std::move(io_str)}; +} + +own<datagram> unix_network::datagram(network_address &addr) { + auto unix_addr_storage = + translate_network_address_to_unix_network_address(addr); + unix_network_address &address = + translate_to_unix_address_ref(unix_addr_storage); + + SAW_ASSERT(address.unix_address_size() > 0) { return nullptr; } + + int fd = address.unix_address(0).socket(SOCK_DGRAM); + + int optval = 1; + int rc = + ::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)); + if (rc < 0) { + ::close(fd); + return nullptr; + } + + bool failed = address.unix_address(0).bind(fd); + if (failed) { + ::close(fd); + return nullptr; + } + /// @todo + return heap<unix_datagram>(event_port_, fd, 0); +} + +const std::string &unix_network_address::address() const { return path_; } + +uint16_t unix_network_address::port() const { return port_hint_; } + +socket_address &unix_network_address::unix_address(size_t i) { + assert(i < addresses_.size()); + /// @todo change from list to vector? + return addresses_.at(i); +} + +size_t unix_network_address::unix_address_size() const { + return addresses_.size(); +} + +unix_network::unix_network(unix_event_port &event) : event_port_{event} {} + +conveyor<own<network_address>> +unix_network::resolve_address(const std::string &path, uint16_t port_hint) { + std::string_view addr_view{path}; + { + std::string_view str_begins_with = "unix:"; + if (begins_with(addr_view, str_begins_with)) { + addr_view.remove_prefix(str_begins_with.size()); + } + } + + std::vector<socket_address> addresses = + socket_address::resolve(addr_view, port_hint); + + return conveyor<own<network_address>>{ + heap<unix_network_address>(path, port_hint, std::move(addresses))}; +} + +unix_io_provider::unix_io_provider(unix_event_port &port_ref, + own<event_port> port) + : event_port_{port_ref}, event_loop_{std::move(port)}, unix_network_{ + port_ref} {} + +own<input_stream> unix_io_provider::wrap_input_fd(int fd) { + return heap<unix_io_stream>(event_port_, fd, 0, EPOLLIN); +} + +class network &unix_io_provider::network() { + return static_cast<class network &>(unix_network_); +} + +class event_loop &unix_io_provider::event_loop() { + return event_loop_; +} + +} // namespace unix + +error_or<async_io_context> setup_async_io() { + using namespace unix; + try { + own<unix_event_port> prt = heap<unix_event_port>(); + unix_event_port &prt_ref = *prt; + + own<unix_io_provider> io_provider = + heap<unix_io_provider>(prt_ref, std::move(prt)); + + event_loop &loop_ref = io_provider->event_loop(); + + return {{std::move(io_provider), loop_ref, prt_ref}}; + } catch (std::bad_alloc &) { + return critical_error("Out of memory"); + } +} +} // namespace saw +#endif |