examples/socketpair.cpp

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/*****************************************************************************
** Includes
*****************************************************************************/

#include <iostream>
#include <cstdlib>
#include <ecl/config/ecl.hpp>
#ifndef ECL_IS_WIN32
  #include <unistd.h>
#endif
#include <ecl/errors/handlers.hpp>
#include "../../include/ecl/io/socketpair.hpp"

/*****************************************************************************
** Macros
*****************************************************************************/

#define DATA1 "In Xanadu, did Kublai Khan . . ."
#define DATA2 "A stately pleasure dome decree . . ."

/*****************************************************************************
** Globals
*****************************************************************************/

ecl::socket_descriptor socket_pair[2];

/*****************************************************************************
** Functions
*****************************************************************************/

#ifdef ECL_IS_WIN32
DWORD WINAPI f(LPVOID args) {
        char buf[1024];
        /* This is the child. */
        while ( 1 ) {
                if( ::send(socket_pair[1], reinterpret_cast<const char*>(DATA1), sizeof(DATA1), 0) < 0 ) {
                        std::cerr << "Failed to write to the threaded socket." << std::endl;
                }
                if ( ::recv(socket_pair[1], reinterpret_cast<char*>(buf), 1024, 0) < 0 ) {
                        std::cerr << "Failed to read from the threaded socket." << std::endl;
                } else {
                        std::cout << buf << std::endl;
                }
                Sleep(1000);
        }
        return 0;
}
#endif

int socket_error() {
#ifdef ECL_IS_WIN32
        return WSAGetLastError();
#else
        return errno;
#endif
}
/*****************************************************************************
** Main
*****************************************************************************/

int main(int argc, char **argv) {

        ecl::SocketError error = ecl::init_sockets();
        if ( error.flag() != ecl::NoError ) {
                std::cout << error.what() << std::endl;
                abort();
        }

        // blocking mode
        error = ecl::socketpair(socket_pair);
        // non blocking mode
        // error = ecl::socketpair(socket_pair,true);

        if ( error.flag() != ecl::NoError) {
                std::cout << error.what() << std::endl;
                std::cout << "SocketPair Error: " << socket_error() << std::endl;
                abort();
        }
        char buf[1024];
#ifdef ECL_IS_WIN32
        DWORD id;
        char thread_param[3];
        HANDLE thread_handle = CreateThread(
            NULL,                   // default security attributes
            0,                      // use default stack size
            f,                                  // thread function name
            &thread_param,                      // argument to thread function
            0,                      // use default creation flags
            &id                                 // returns the thread identifier
     );
        /* This is the parent */
        while ( 1 ) {
                if ( ::recv(socket_pair[0], reinterpret_cast<char*>(buf), 1024, 0) < 0 ) {
                        std::cerr << "Failed to read from the main socket." << std::endl;
                } else {
                        std::cout << buf << std::endl;
                }
                if( ::send(socket_pair[0], reinterpret_cast<const char*>(DATA2), sizeof(DATA2), 0) < 0 ) {
                        std::cerr << "Failed to write to the main socket." << std::endl;
                }
                Sleep(1000);
        }
#else
        int child;
        if ((child = fork()) == -1) {
                std::cerr << "Failed to fork." << std::endl;
        } else if (child) {
                /* This is the parent */
                while ( 1 ) {
                        if (read(socket_pair[0], buf, 1024) < 0) {
                                std::cerr << "Failed to read from the socket." << std::endl;
                        } else {
                                std::cout << buf << std::endl;
                        }
                        if (write(socket_pair[0], DATA2, sizeof(DATA2)) < 0) {
                                std::cerr << "Failed to write to the socket." << std::endl;
                        }
                        sleep(1);
                }
        } else {
                /* This is the child. */
                while ( 1 ) {
                        if (write(socket_pair[1], DATA1, sizeof(DATA1)) < 0) {
                                std::cerr << "Failed to write to the socket." << std::endl;
                        }
                        if (read(socket_pair[1], buf, 1024) < 0) {
                                std::cerr << "Failed to read from the socket." << std::endl;
                        } else {
                                std::cout << buf << std::endl;
                        }
                        sleep(1); // 1 sec
                }
        }
#endif
        ecl::close_socket(socket_pair[0]);
        ecl::close_socket(socket_pair[1]);
        return 0;
}