diff options
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/fork')
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/fork/.gitignore | 11 | ||||
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/fork/daemon.cpp | 189 | ||||
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp | 160 |
3 files changed, 0 insertions, 360 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/fork/.gitignore b/3rdparty/asio/src/examples/cpp03/fork/.gitignore deleted file mode 100644 index 6b565fe313a..00000000000 --- a/3rdparty/asio/src/examples/cpp03/fork/.gitignore +++ /dev/null @@ -1,11 +0,0 @@ -.deps -.dirstamp -*.o -*.obj -*.exe -*.ilk -*.manifest -*.pdb -*.tds -daemon -process_per_connection diff --git a/3rdparty/asio/src/examples/cpp03/fork/daemon.cpp b/3rdparty/asio/src/examples/cpp03/fork/daemon.cpp deleted file mode 100644 index 06eef3d6b49..00000000000 --- a/3rdparty/asio/src/examples/cpp03/fork/daemon.cpp +++ /dev/null @@ -1,189 +0,0 @@ -// -// daemon.cpp -// ~~~~~~~~~~ -// -// Copyright (c) 2003-2016 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/udp.hpp> -#include <asio/signal_set.hpp> -#include <boost/array.hpp> -#include <boost/bind.hpp> -#include <ctime> -#include <iostream> -#include <syslog.h> -#include <unistd.h> - -using asio::ip::udp; - -class udp_daytime_server -{ -public: - udp_daytime_server(asio::io_context& io_context) - : socket_(io_context, udp::endpoint(udp::v4(), 13)) - { - start_receive(); - } - -private: - void start_receive() - { - socket_.async_receive_from( - asio::buffer(recv_buffer_), remote_endpoint_, - boost::bind(&udp_daytime_server::handle_receive, this, _1)); - } - - void handle_receive(const asio::error_code& ec) - { - if (!ec || ec == asio::error::message_size) - { - using namespace std; // For time_t, time and ctime; - time_t now = time(0); - std::string message = ctime(&now); - - asio::error_code ignored_ec; - socket_.send_to(asio::buffer(message), - remote_endpoint_, 0, ignored_ec); - } - - start_receive(); - } - - udp::socket socket_; - udp::endpoint remote_endpoint_; - boost::array<char, 1> recv_buffer_; -}; - -int main() -{ - try - { - asio::io_context io_context; - - // Initialise the server before becoming a daemon. If the process is - // started from a shell, this means any errors will be reported back to the - // user. - udp_daytime_server server(io_context); - - // Register signal handlers so that the daemon may be shut down. You may - // also want to register for other signals, such as SIGHUP to trigger a - // re-read of a configuration file. - asio::signal_set signals(io_context, SIGINT, SIGTERM); - signals.async_wait( - boost::bind(&asio::io_context::stop, &io_context)); - - // Inform the io_context that we are about to become a daemon. 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); - - // Fork the process and have the parent exit. If the process was started - // from a shell, this returns control to the user. Forking a new process is - // also a prerequisite for the subsequent call to setsid(). - if (pid_t pid = fork()) - { - if (pid > 0) - { - // We're in the parent process and need to exit. - // - // When the exit() function is used, the program terminates without - // invoking local variables' destructors. Only global variables are - // destroyed. As the io_context object is a local variable, this means - // we do not have to call: - // - // io_context.notify_fork(asio::io_context::fork_parent); - // - // However, this line should be added before each call to exit() if - // using a global io_context object. An additional call: - // - // io_context.notify_fork(asio::io_context::fork_prepare); - // - // should also precede the second fork(). - exit(0); - } - else - { - syslog(LOG_ERR | LOG_USER, "First fork failed: %m"); - return 1; - } - } - - // Make the process a new session leader. This detaches it from the - // terminal. - setsid(); - - // A process inherits its working directory from its parent. This could be - // on a mounted filesystem, which means that the running daemon would - // prevent this filesystem from being unmounted. Changing to the root - // directory avoids this problem. - chdir("/"); - - // The file mode creation mask is also inherited from the parent process. - // We don't want to restrict the permissions on files created by the - // daemon, so the mask is cleared. - umask(0); - - // A second fork ensures the process cannot acquire a controlling terminal. - if (pid_t pid = fork()) - { - if (pid > 0) - { - exit(0); - } - else - { - syslog(LOG_ERR | LOG_USER, "Second fork failed: %m"); - return 1; - } - } - - // Close the standard streams. This decouples the daemon from the terminal - // that started it. - close(0); - close(1); - close(2); - - // We don't want the daemon to have any standard input. - if (open("/dev/null", O_RDONLY) < 0) - { - syslog(LOG_ERR | LOG_USER, "Unable to open /dev/null: %m"); - return 1; - } - - // Send standard output to a log file. - const char* output = "/tmp/asio.daemon.out"; - const int flags = O_WRONLY | O_CREAT | O_APPEND; - const mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; - if (open(output, flags, mode) < 0) - { - syslog(LOG_ERR | LOG_USER, "Unable to open output file %s: %m", output); - return 1; - } - - // Also send standard error to the same log file. - if (dup(1) < 0) - { - syslog(LOG_ERR | LOG_USER, "Unable to dup output descriptor: %m"); - return 1; - } - - // Inform the io_context that we have finished becoming a daemon. The - // io_context uses this opportunity to create any internal file descriptors - // that need to be private to the new process. - io_context.notify_fork(asio::io_context::fork_child); - - // The io_context can now be used normally. - syslog(LOG_INFO | LOG_USER, "Daemon started"); - io_context.run(); - syslog(LOG_INFO | LOG_USER, "Daemon stopped"); - } - catch (std::exception& e) - { - syslog(LOG_ERR | LOG_USER, "Exception: %s", e.what()); - std::cerr << "Exception: " << e.what() << std::endl; - } -} 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 483147e9552..00000000000 --- a/3rdparty/asio/src/examples/cpp03/fork/process_per_connection.cpp +++ /dev/null @@ -1,160 +0,0 @@ -// -// process_per_connection.cpp -// ~~~~~~~~~~~~~~~~~~~~~~~~~~ -// -// Copyright (c) 2003-2016 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.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, _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, _1, _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, _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; - } -} |