For a server using c++, how do you accept multiple clients, handle X requests at a time with a backlog of X

I was wondering how I could handle multiple requests at the same time on a C server. I think I have the backlog correct (I wanted it at 20). I also am stumped on how to handle X (I want to use 10 in my case) requests at the same time. I have a working client with the server so far.

#define WIN32_LEAN_AND_MEAN



#include <windows.h>

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdlib.h>

#include <stdio.h>

#include <sstream>

#include <iostream>

#include <vector>

#include <iterator>

#include "mathParse.h"





class Mathparse;



// Need to link with Ws2_32.lib

#pragma comment (lib, "Ws2_32.lib")

#pragma comment (lib, "Mswsock.lib")



#define DEFAULT_BUFLEN 512

#define DEFAULT_PORT "27015"



int __cdecl main(void)

{

    WSADATA wsaData;

    int iResult;

    MathParse tester;

    SOCKET ListenSocket = INVALID_SOCKET;

    SOCKET ClientSocket = INVALID_SOCKET;



    struct addrinfo *result = NULL;

    struct addrinfo hints;



    int iSendResult;

    char recvbuf[DEFAULT_BUFLEN];

    int recvbuflen = DEFAULT_BUFLEN;



    // Initialize Winsock

    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (iResult != 0) {

        printf("WSAStartup failed with error: %dn", iResult);

        return 1;

    }



    ZeroMemory(&hints, sizeof(hints));

    hints.ai_family = AF_INET;

    hints.ai_socktype = SOCK_STREAM;

    hints.ai_protocol = IPPROTO_TCP;

    hints.ai_flags = AI_PASSIVE;



    // Resolve the server address and port

    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);

    if (iResult != 0) {

        printf("getaddrinfo failed with error: %dn", iResult);

        WSACleanup();

        return 1;

    }



    // Create a SOCKET for connecting to server

    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (ListenSocket == INVALID_SOCKET) {

        printf("socket failed with error: %ldn", WSAGetLastError());

        freeaddrinfo(result);

        WSACleanup();

        return 1;

    }



    // Setup the TCP listening socket

    iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);

    if (iResult == SOCKET_ERROR) {

        printf("bind failed with error: %dn", WSAGetLastError());

        freeaddrinfo(result);

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    freeaddrinfo(result);



    iResult = listen(ListenSocket, 20);

    if (iResult == SOCKET_ERROR) {

        printf("listen failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // Accept a client socket

    ClientSocket = accept(ListenSocket, NULL, NULL);

    if (ClientSocket == INVALID_SOCKET) {

        printf("accept failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // No longer need server socket

    closesocket(ListenSocket);



    // Receive until the peer shuts down the connection

    do {





        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);





        if (iResult > 0) {

            //char* str = { recvbuf };

            //nt x = sizeof(str);

            //std::string s(x, str);



            //;



            // Echo the buffer back to the sender

            std::string x = MathParse::pars(recvbuf);

            std::string s(recvbuf);

            iSendResult = send(ClientSocket, x.c_str(), iResult, 0);

            if (iSendResult == SOCKET_ERROR) {

                printf("send failed with error: %dn", WSAGetLastError());

                closesocket(ClientSocket);

                WSACleanup();

                return 1;

            }









            //std::cout << "ASDKJAHSDKJD" << s << std::endl;



            printf("Bytes sentsdsdsdsdsdsdsdsdssdsdsdsd: n", x);

            //system("PAUSE");

        }

        else if (iResult == 0)

            printf("Connection closing...n");

        else {

            printf("recv failed with error: %dn", WSAGetLastError());

            closesocket(ClientSocket);

            WSACleanup();

            return 1;

        }



    } while (iResult > 0);



    // shutdown the connection since we're done

    iResult = shutdown(ClientSocket, SD_SEND);

    if (iResult == SOCKET_ERROR) {

        printf("shutdown failed with error: %dn", WSAGetLastError());

        closesocket(ClientSocket);

        WSACleanup();

        return 1;

    }



    // cleanup

    closesocket(ClientSocket);

    WSACleanup();



    return 0;

}

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

@NathanOliver and PasserBy ty! sorry I mixed them up because I was using printf with this.

– Glenville Pecor
Nov 19 '18 at 22:58

1

Unrelated: Remember that TCP is a stream-based and not a message-based protocol. iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); doesn't give any guarantees that you will receive one-and-only-one message. The input to MathParse::pars(recvbuf);could be anywhere between 1 and recvbuflen bytes. How many bytes has not been provided, so the function is almost certainly doomed. Similarly, send(ClientSocket, x.c_str(), iResult, 0); may not be providing (have to see what's in x to be sure) the receiver with any way to tell one message from the next.

– user4581301
Nov 19 '18 at 23:18

1

You would need to either have multiple threads or use a select-based event loop.

– n.m.
Nov 19 '18 at 23:19

1

On topic, normally I would use IO multiplexing (select (epoll if it's available) in a POSIX OS or Overlapped IO on Windows) to manage multiple simultaneous connections. Link this up with a thread pool if the transactions could be time-consuming and cause unreasonable delays in other transactions.

– user4581301
Nov 19 '18 at 23:25

add a comment |

#define WIN32_LEAN_AND_MEAN



#include <windows.h>

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdlib.h>

#include <stdio.h>

#include <sstream>

#include <iostream>

#include <vector>

#include <iterator>

#include "mathParse.h"





class Mathparse;



// Need to link with Ws2_32.lib

#pragma comment (lib, "Ws2_32.lib")

#pragma comment (lib, "Mswsock.lib")



#define DEFAULT_BUFLEN 512

#define DEFAULT_PORT "27015"



int __cdecl main(void)

{

    WSADATA wsaData;

    int iResult;

    MathParse tester;

    SOCKET ListenSocket = INVALID_SOCKET;

    SOCKET ClientSocket = INVALID_SOCKET;



    struct addrinfo *result = NULL;

    struct addrinfo hints;



    int iSendResult;

    char recvbuf[DEFAULT_BUFLEN];

    int recvbuflen = DEFAULT_BUFLEN;



    // Initialize Winsock

    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (iResult != 0) {

        printf("WSAStartup failed with error: %dn", iResult);

        return 1;

    }



    ZeroMemory(&hints, sizeof(hints));

    hints.ai_family = AF_INET;

    hints.ai_socktype = SOCK_STREAM;

    hints.ai_protocol = IPPROTO_TCP;

    hints.ai_flags = AI_PASSIVE;



    // Resolve the server address and port

    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);

    if (iResult != 0) {

        printf("getaddrinfo failed with error: %dn", iResult);

        WSACleanup();

        return 1;

    }



    // Create a SOCKET for connecting to server

    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (ListenSocket == INVALID_SOCKET) {

        printf("socket failed with error: %ldn", WSAGetLastError());

        freeaddrinfo(result);

        WSACleanup();

        return 1;

    }



    // Setup the TCP listening socket

    iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);

    if (iResult == SOCKET_ERROR) {

        printf("bind failed with error: %dn", WSAGetLastError());

        freeaddrinfo(result);

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    freeaddrinfo(result);



    iResult = listen(ListenSocket, 20);

    if (iResult == SOCKET_ERROR) {

        printf("listen failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // Accept a client socket

    ClientSocket = accept(ListenSocket, NULL, NULL);

    if (ClientSocket == INVALID_SOCKET) {

        printf("accept failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // No longer need server socket

    closesocket(ListenSocket);



    // Receive until the peer shuts down the connection

    do {





        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);





        if (iResult > 0) {

            //char* str = { recvbuf };

            //nt x = sizeof(str);

            //std::string s(x, str);



            //;



            // Echo the buffer back to the sender

            std::string x = MathParse::pars(recvbuf);

            std::string s(recvbuf);

            iSendResult = send(ClientSocket, x.c_str(), iResult, 0);

            if (iSendResult == SOCKET_ERROR) {

                printf("send failed with error: %dn", WSAGetLastError());

                closesocket(ClientSocket);

                WSACleanup();

                return 1;

            }









            //std::cout << "ASDKJAHSDKJD" << s << std::endl;



            printf("Bytes sentsdsdsdsdsdsdsdsdssdsdsdsd: n", x);

            //system("PAUSE");

        }

        else if (iResult == 0)

            printf("Connection closing...n");

        else {

            printf("recv failed with error: %dn", WSAGetLastError());

            closesocket(ClientSocket);

            WSACleanup();

            return 1;

        }



    } while (iResult > 0);



    // shutdown the connection since we're done

    iResult = shutdown(ClientSocket, SD_SEND);

    if (iResult == SOCKET_ERROR) {

        printf("shutdown failed with error: %dn", WSAGetLastError());

        closesocket(ClientSocket);

        WSACleanup();

        return 1;

    }



    // cleanup

    closesocket(ClientSocket);

    WSACleanup();



    return 0;

}

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

@NathanOliver and PasserBy ty! sorry I mixed them up because I was using printf with this.

– Glenville Pecor
Nov 19 '18 at 22:58

1

Unrelated: Remember that TCP is a stream-based and not a message-based protocol. iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); doesn't give any guarantees that you will receive one-and-only-one message. The input to MathParse::pars(recvbuf);could be anywhere between 1 and recvbuflen bytes. How many bytes has not been provided, so the function is almost certainly doomed. Similarly, send(ClientSocket, x.c_str(), iResult, 0); may not be providing (have to see what's in x to be sure) the receiver with any way to tell one message from the next.

– user4581301
Nov 19 '18 at 23:18

1

You would need to either have multiple threads or use a select-based event loop.

– n.m.
Nov 19 '18 at 23:19

1

On topic, normally I would use IO multiplexing (select (epoll if it's available) in a POSIX OS or Overlapped IO on Windows) to manage multiple simultaneous connections. Link this up with a thread pool if the transactions could be time-consuming and cause unreasonable delays in other transactions.

– user4581301
Nov 19 '18 at 23:25

add a comment |

#define WIN32_LEAN_AND_MEAN



#include <windows.h>

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdlib.h>

#include <stdio.h>

#include <sstream>

#include <iostream>

#include <vector>

#include <iterator>

#include "mathParse.h"





class Mathparse;



// Need to link with Ws2_32.lib

#pragma comment (lib, "Ws2_32.lib")

#pragma comment (lib, "Mswsock.lib")



#define DEFAULT_BUFLEN 512

#define DEFAULT_PORT "27015"



int __cdecl main(void)

{

    WSADATA wsaData;

    int iResult;

    MathParse tester;

    SOCKET ListenSocket = INVALID_SOCKET;

    SOCKET ClientSocket = INVALID_SOCKET;



    struct addrinfo *result = NULL;

    struct addrinfo hints;



    int iSendResult;

    char recvbuf[DEFAULT_BUFLEN];

    int recvbuflen = DEFAULT_BUFLEN;



    // Initialize Winsock

    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (iResult != 0) {

        printf("WSAStartup failed with error: %dn", iResult);

        return 1;

    }



    ZeroMemory(&hints, sizeof(hints));

    hints.ai_family = AF_INET;

    hints.ai_socktype = SOCK_STREAM;

    hints.ai_protocol = IPPROTO_TCP;

    hints.ai_flags = AI_PASSIVE;



    // Resolve the server address and port

    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);

    if (iResult != 0) {

        printf("getaddrinfo failed with error: %dn", iResult);

        WSACleanup();

        return 1;

    }



    // Create a SOCKET for connecting to server

    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (ListenSocket == INVALID_SOCKET) {

        printf("socket failed with error: %ldn", WSAGetLastError());

        freeaddrinfo(result);

        WSACleanup();

        return 1;

    }



    // Setup the TCP listening socket

    iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);

    if (iResult == SOCKET_ERROR) {

        printf("bind failed with error: %dn", WSAGetLastError());

        freeaddrinfo(result);

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    freeaddrinfo(result);



    iResult = listen(ListenSocket, 20);

    if (iResult == SOCKET_ERROR) {

        printf("listen failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // Accept a client socket

    ClientSocket = accept(ListenSocket, NULL, NULL);

    if (ClientSocket == INVALID_SOCKET) {

        printf("accept failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // No longer need server socket

    closesocket(ListenSocket);



    // Receive until the peer shuts down the connection

    do {





        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);





        if (iResult > 0) {

            //char* str = { recvbuf };

            //nt x = sizeof(str);

            //std::string s(x, str);



            //;



            // Echo the buffer back to the sender

            std::string x = MathParse::pars(recvbuf);

            std::string s(recvbuf);

            iSendResult = send(ClientSocket, x.c_str(), iResult, 0);

            if (iSendResult == SOCKET_ERROR) {

                printf("send failed with error: %dn", WSAGetLastError());

                closesocket(ClientSocket);

                WSACleanup();

                return 1;

            }









            //std::cout << "ASDKJAHSDKJD" << s << std::endl;



            printf("Bytes sentsdsdsdsdsdsdsdsdssdsdsdsd: n", x);

            //system("PAUSE");

        }

        else if (iResult == 0)

            printf("Connection closing...n");

        else {

            printf("recv failed with error: %dn", WSAGetLastError());

            closesocket(ClientSocket);

            WSACleanup();

            return 1;

        }



    } while (iResult > 0);



    // shutdown the connection since we're done

    iResult = shutdown(ClientSocket, SD_SEND);

    if (iResult == SOCKET_ERROR) {

        printf("shutdown failed with error: %dn", WSAGetLastError());

        closesocket(ClientSocket);

        WSACleanup();

        return 1;

    }



    // cleanup

    closesocket(ClientSocket);

    WSACleanup();



    return 0;

}

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

#define WIN32_LEAN_AND_MEAN



#include <windows.h>

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdlib.h>

#include <stdio.h>

#include <sstream>

#include <iostream>

#include <vector>

#include <iterator>

#include "mathParse.h"





class Mathparse;



// Need to link with Ws2_32.lib

#pragma comment (lib, "Ws2_32.lib")

#pragma comment (lib, "Mswsock.lib")



#define DEFAULT_BUFLEN 512

#define DEFAULT_PORT "27015"



int __cdecl main(void)

{

    WSADATA wsaData;

    int iResult;

    MathParse tester;

    SOCKET ListenSocket = INVALID_SOCKET;

    SOCKET ClientSocket = INVALID_SOCKET;



    struct addrinfo *result = NULL;

    struct addrinfo hints;



    int iSendResult;

    char recvbuf[DEFAULT_BUFLEN];

    int recvbuflen = DEFAULT_BUFLEN;



    // Initialize Winsock

    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);

    if (iResult != 0) {

        printf("WSAStartup failed with error: %dn", iResult);

        return 1;

    }



    ZeroMemory(&hints, sizeof(hints));

    hints.ai_family = AF_INET;

    hints.ai_socktype = SOCK_STREAM;

    hints.ai_protocol = IPPROTO_TCP;

    hints.ai_flags = AI_PASSIVE;



    // Resolve the server address and port

    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);

    if (iResult != 0) {

        printf("getaddrinfo failed with error: %dn", iResult);

        WSACleanup();

        return 1;

    }



    // Create a SOCKET for connecting to server

    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (ListenSocket == INVALID_SOCKET) {

        printf("socket failed with error: %ldn", WSAGetLastError());

        freeaddrinfo(result);

        WSACleanup();

        return 1;

    }



    // Setup the TCP listening socket

    iResult = bind(ListenSocket, result->ai_addr, (int)result->ai_addrlen);

    if (iResult == SOCKET_ERROR) {

        printf("bind failed with error: %dn", WSAGetLastError());

        freeaddrinfo(result);

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    freeaddrinfo(result);



    iResult = listen(ListenSocket, 20);

    if (iResult == SOCKET_ERROR) {

        printf("listen failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // Accept a client socket

    ClientSocket = accept(ListenSocket, NULL, NULL);

    if (ClientSocket == INVALID_SOCKET) {

        printf("accept failed with error: %dn", WSAGetLastError());

        closesocket(ListenSocket);

        WSACleanup();

        return 1;

    }



    // No longer need server socket

    closesocket(ListenSocket);



    // Receive until the peer shuts down the connection

    do {





        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);





        if (iResult > 0) {

            //char* str = { recvbuf };

            //nt x = sizeof(str);

            //std::string s(x, str);



            //;



            // Echo the buffer back to the sender

            std::string x = MathParse::pars(recvbuf);

            std::string s(recvbuf);

            iSendResult = send(ClientSocket, x.c_str(), iResult, 0);

            if (iSendResult == SOCKET_ERROR) {

                printf("send failed with error: %dn", WSAGetLastError());

                closesocket(ClientSocket);

                WSACleanup();

                return 1;

            }









            //std::cout << "ASDKJAHSDKJD" << s << std::endl;



            printf("Bytes sentsdsdsdsdsdsdsdsdssdsdsdsd: n", x);

            //system("PAUSE");

        }

        else if (iResult == 0)

            printf("Connection closing...n");

        else {

            printf("recv failed with error: %dn", WSAGetLastError());

            closesocket(ClientSocket);

            WSACleanup();

            return 1;

        }



    } while (iResult > 0);



    // shutdown the connection since we're done

    iResult = shutdown(ClientSocket, SD_SEND);

    if (iResult == SOCKET_ERROR) {

        printf("shutdown failed with error: %dn", WSAGetLastError());

        closesocket(ClientSocket);

        WSACleanup();

        return 1;

    }



    // cleanup

    closesocket(ClientSocket);

    WSACleanup();



    return 0;

}

c++ server

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

edited Nov 19 '18 at 23:12

Galik

33.6k34876

edited Nov 19 '18 at 23:12

Galik

33.6k34876

edited Nov 19 '18 at 23:12

Galik

33.6k34876

asked Nov 19 '18 at 22:49

Glenville Pecor

asked Nov 19 '18 at 22:49

Glenville Pecor

asked Nov 19 '18 at 22:49

Glenville Pecor

@NathanOliver and PasserBy ty! sorry I mixed them up because I was using printf with this.

– Glenville Pecor
Nov 19 '18 at 22:58

1

Unrelated: Remember that TCP is a stream-based and not a message-based protocol. iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); doesn't give any guarantees that you will receive one-and-only-one message. The input to MathParse::pars(recvbuf);could be anywhere between 1 and recvbuflen bytes. How many bytes has not been provided, so the function is almost certainly doomed. Similarly, send(ClientSocket, x.c_str(), iResult, 0); may not be providing (have to see what's in x to be sure) the receiver with any way to tell one message from the next.

– user4581301
Nov 19 '18 at 23:18

1

You would need to either have multiple threads or use a select-based event loop.

– n.m.
Nov 19 '18 at 23:19

1

On topic, normally I would use IO multiplexing (select (epoll if it's available) in a POSIX OS or Overlapped IO on Windows) to manage multiple simultaneous connections. Link this up with a thread pool if the transactions could be time-consuming and cause unreasonable delays in other transactions.

– user4581301
Nov 19 '18 at 23:25

add a comment |

@NathanOliver and PasserBy ty! sorry I mixed them up because I was using printf with this.

– Glenville Pecor
Nov 19 '18 at 22:58

1

Unrelated: Remember that TCP is a stream-based and not a message-based protocol. iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); doesn't give any guarantees that you will receive one-and-only-one message. The input to MathParse::pars(recvbuf);could be anywhere between 1 and recvbuflen bytes. How many bytes has not been provided, so the function is almost certainly doomed. Similarly, send(ClientSocket, x.c_str(), iResult, 0); may not be providing (have to see what's in x to be sure) the receiver with any way to tell one message from the next.

– user4581301
Nov 19 '18 at 23:18

1

You would need to either have multiple threads or use a select-based event loop.

– n.m.
Nov 19 '18 at 23:19

1

On topic, normally I would use IO multiplexing (select (epoll if it's available) in a POSIX OS or Overlapped IO on Windows) to manage multiple simultaneous connections. Link this up with a thread pool if the transactions could be time-consuming and cause unreasonable delays in other transactions.

– user4581301
Nov 19 '18 at 23:25

@NathanOliver and PasserBy ty! sorry I mixed them up because I was using printf with this.

– Glenville Pecor
Nov 19 '18 at 22:58

Unrelated: Remember that TCP is a stream-based and not a message-based protocol. iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); doesn't give any guarantees that you will receive one-and-only-one message. The input to MathParse::pars(recvbuf);could be anywhere between 1 and recvbuflen bytes. How many bytes has not been provided, so the function is almost certainly doomed. Similarly, send(ClientSocket, x.c_str(), iResult, 0); may not be providing (have to see what's in x to be sure) the receiver with any way to tell one message from the next.

– user4581301
Nov 19 '18 at 23:18

You would need to either have multiple threads or use a select-based event loop.

– n.m.
Nov 19 '18 at 23:19

On topic, normally I would use IO multiplexing (select (epoll if it's available) in a POSIX OS or Overlapped IO on Windows) to manage multiple simultaneous connections. Link this up with a thread pool if the transactions could be time-consuming and cause unreasonable delays in other transactions.

– user4581301
Nov 19 '18 at 23:25

add a comment |

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