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author | 2024-04-22 08:04:58 +1000 | |
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committer | 2024-04-22 08:04:58 +1000 | |
commit | 184292b730f4236bd4840e780fdad97ee060ec84 (patch) | |
tree | 67902161a465fe92aec78ca502de07092b8cde0f /3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp | |
parent | 24154bc1f00790f344120b3a85175d6f616c5ad0 (diff) |
3rdparty/asio: Updated to 1.30.2
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp')
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp b/3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp deleted file mode 100644 index 9a54baedac4..00000000000 --- a/3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp +++ /dev/null @@ -1,161 +0,0 @@ -// -// process_per_connection.cpp -// ~~~~~~~~~~~~~~~~~~~~~~~~~~ -// -// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) -// -// Distributed under the Boost Software License, Version 1.0. (See accompanying -// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -// - -#include <asio/io_context.hpp> -#include <asio/ip/tcp.hpp> -#include <asio/signal_set.hpp> -#include <asio/write.hpp> -#include <boost/array.hpp> -#include <boost/bind/bind.hpp> -#include <cstdlib> -#include <iostream> -#include <sys/types.h> -#include <sys/wait.h> -#include <unistd.h> - -using asio::ip::tcp; - -class server -{ -public: - server(asio::io_context& io_context, unsigned short port) - : io_context_(io_context), - signal_(io_context, SIGCHLD), - acceptor_(io_context, tcp::endpoint(tcp::v4(), port)), - socket_(io_context) - { - start_signal_wait(); - start_accept(); - } - -private: - void start_signal_wait() - { - signal_.async_wait(boost::bind(&server::handle_signal_wait, this)); - } - - void handle_signal_wait() - { - // Only the parent process should check for this signal. We can determine - // whether we are in the parent by checking if the acceptor is still open. - if (acceptor_.is_open()) - { - // Reap completed child processes so that we don't end up with zombies. - int status = 0; - while (waitpid(-1, &status, WNOHANG) > 0) {} - - start_signal_wait(); - } - } - - void start_accept() - { - acceptor_.async_accept(socket_, - boost::bind(&server::handle_accept, this, boost::placeholders::_1)); - } - - void handle_accept(const asio::error_code& ec) - { - if (!ec) - { - // Inform the io_context that we are about to fork. The io_context cleans - // up any internal resources, such as threads, that may interfere with - // forking. - io_context_.notify_fork(asio::io_context::fork_prepare); - - if (fork() == 0) - { - // Inform the io_context that the fork is finished and that this is the - // child process. The io_context uses this opportunity to create any - // internal file descriptors that must be private to the new process. - io_context_.notify_fork(asio::io_context::fork_child); - - // The child won't be accepting new connections, so we can close the - // acceptor. It remains open in the parent. - acceptor_.close(); - - // The child process is not interested in processing the SIGCHLD signal. - signal_.cancel(); - - start_read(); - } - else - { - // Inform the io_context that the fork is finished (or failed) and that - // this is the parent process. The io_context uses this opportunity to - // recreate any internal resources that were cleaned up during - // preparation for the fork. - io_context_.notify_fork(asio::io_context::fork_parent); - - socket_.close(); - start_accept(); - } - } - else - { - std::cerr << "Accept error: " << ec.message() << std::endl; - start_accept(); - } - } - - void start_read() - { - socket_.async_read_some(asio::buffer(data_), - boost::bind(&server::handle_read, this, - boost::placeholders::_1, boost::placeholders::_2)); - } - - void handle_read(const asio::error_code& ec, std::size_t length) - { - if (!ec) - start_write(length); - } - - void start_write(std::size_t length) - { - asio::async_write(socket_, asio::buffer(data_, length), - boost::bind(&server::handle_write, this, boost::placeholders::_1)); - } - - void handle_write(const asio::error_code& ec) - { - if (!ec) - start_read(); - } - - asio::io_context& io_context_; - asio::signal_set signal_; - tcp::acceptor acceptor_; - tcp::socket socket_; - boost::array<char, 1024> data_; -}; - -int main(int argc, char* argv[]) -{ - try - { - if (argc != 2) - { - std::cerr << "Usage: process_per_connection <port>\n"; - return 1; - } - - asio::io_context io_context; - - using namespace std; // For atoi. - server s(io_context, atoi(argv[1])); - - io_context.run(); - } - catch (std::exception& e) - { - std::cerr << "Exception: " << e.what() << std::endl; - } -} |