Apply non$-$blocking and multiple client connection to this Client Server codes by using Select$()$ method. The client and server should be able to send messages to each other whenever they want. They shouldn't have to send them in order. I don't prefer it for now, but if necessary, you can use a single thread structure. The kick and quit should continue to work as below.

$//$Client

#define WIN$32\_$LEAN$\_$AND$\_$MEAN

#include

#include

#include

#include

$//$ Need to link with Ws$2\_32.$lib

#pragma comment$($lib$,"$Ws$2\_32.$lib"$)$

#define DEFAULT$\_$BUFLEN $512$

#define DEFAULT$\_$PORT $"27015"$

int $\_\_$cdecl main$($int argc, char $**$argv$)$

$\{$

WSADATA wsaData;

SOCKET ConnectSocket $=$ INVALID$\_$SOCKET;

struct addrinfo $*$result $=$ NULL, $*$ptr $=$ NULL, hints;

char recvbuf$[$DEFAULT$\_$BUFLEN$]$;

int iResult;

int recvbuflen $=$ DEFAULT$\_$BUFLEN;

if $($argc $!=2)\{$

printf$("$usage: $\%$s server$-$name

$",$ argv$[0])$;

return $1$;

$\}$

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

if $($iResult $!=0)\{$

printf$("$WSAStartup failed with error: $\%$d

$",$ iResult$)$;

return $1$;

$\}$

ZeroMemory$($&hints, sizeof$($hints$))$;

hints.ai$\_$family $=$ AF$\_$UNSPEC;

hints.ai$\_$socktype $=$ SOCK$\_$STREAM;

hints.ai$\_$protocol $=$ IPPROTO$\_$TCP;

iResult $=$ getaddrinfo$($argv$[1],$ DEFAULT$\_$PORT, &hints, &result$)$;

if $($iResult $!=0)\{$

printf$("$getaddrinfo failed with error: $\%$d

$",$ iResult$)$;

WSACleanup$()$;

return $1$;

$\}$

for $($ptr $=$ result; ptr $!=$ NULL; ptr $=$ ptr$->$ai$\_$next$)\{$

ConnectSocket $=$ socket$($ptr$->$ai$\_$family, ptr$->$ai$\_$socktype, ptr$->$ai$\_$protocol$)$;

if $($ConnectSocket $==$ INVALID$\_$SOCKET$)\{$

printf$("$socket failed with error: $\%$ld

$",$ WSAGetLastError$())$;

WSACleanup$()$;

return $1$;

$\}$

iResult $=$ connect$($ConnectSocket$,$ ptr$->$ai$\_$addr, $($int$)$ptr$->$ai$\_$addrlen$)$;

if $($iResult $==$ SOCKET$\_$ERROR$)\{$

closesocket$($ConnectSocket$)$;

ConnectSocket $=$ INVALID$\_$SOCKET;

continue;

$\}$

break;

$\}$

freeaddrinfo$($result$)$;

if $($ConnectSocket $==$ INVALID$\_$SOCKET$)\{$

printf$("$Unable to connect to server!

$")$;

WSACleanup$()$;

return $1$;

$\}$

char sendbuf$[$DEFAULT$\_$BUFLEN$]$;

printf$("$Connected to server. Type 'quit' to exit.

$")$;

while $(1)\{$

printf$("$Enter message: $")$;

fgets$($sendbuf$,$ DEFAULT$\_$BUFLEN, stdin$)$;

sendbuf$[$strcspn$($sendbuf$,"$

$")]=0$;

iResult $=$ send$($ConnectSocket$,$ sendbuf$,($int$)$strlen$($sendbuf$),0)$;

if $($iResult $==$ SOCKET$\_$ERROR$)\{$

printf$("$send failed with error: $\%$d

$",$ WSAGetLastError$())$;

closesocket$($ConnectSocket$)$;

WSACleanup$()$;

return $1$;

$\}$

if $($strcmp$($sendbuf$,$ "quit"$)==0)\{$

printf$("$Client exiting...

$")$;

break;

$\}$

iResult $=$ recv$($ConnectSocket$,$ recvbuf, recvbuflen, $0)$;

if $($iResult $>0)\{$

recvbuf$[$iResult$]=\text{'}\backslash 0\text{'}$;

printf$("$Server: $\%$s

$",$ recvbuf$)$;

if $($strcmp$($recvbuf$,$ "kick"$)==0)\{$

printf$("$Kicked by server.

$")$;

break;

$\}$

$\}$ else if $($iResult $==0)\{$

printf$("$Connection closed

$")$;

break;

$\}$ else $\{$

printf$("$recv failed with error: $\%$d

$",$ WSAGetLastError$())$;

break;

$\}$

$\}$

closesocket$($ConnectSocket$)$;

WSACleanup$()$;

return $0$;

$\}$

$//$ Server

#undef UNICODE

#define WIN$32\_$LEAN$\_$AND$\_$MEAN

#include

#include

#include

#include

$//$ Need to link with Ws$2\_32.$lib

#pragma comment$($lib$,"$Ws$2\_32.$lib"$)$

#define DEFAULT$\_$BUFLEN $512$

#define DEFAULT$\_$PORT $"27015"$

int $\_\_$cdecl main$($void$)$

$\{$

WSADATA wsaData;

int iResult;

SOCKET ListenSocket $=$ INVALID$\_$SOCKET;

SOCKET ClientSocket $=$ INVALID$\_$SOCKET;

struct addrinfo $*$result $=$ NULL, hints;

char recvbuf$[$DEFAULT$\_$BUFLEN$]$;

int recvbuflen $=$ DEFAULT$\_$BUFLEN;

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

if $($iResult $!=0)\{$

printf$("$WSAStartup failed with error: $\%$d

$",$ 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;

iResult $=$ getaddrinfo$($NULL$,$ DEFAULT$\_$PORT, &hints, &result$)$;

if $($iResult $!=0)\{$

printf$("$getaddrinfo failed with error: $\%$d

$",$ iResult$)$;

WSACleanup$()$;

return $1$;

$\}$

ListenSocket $=$ socket$($result$->$ai$\_$family, result$->$ai$\_$socktype, result$->$ai$\_$protocol$)$;

if $($ListenSocket $==$ INVALID$\_$SOCKET$)\{$

printf$("$socket failed with error: $\%$ld

$",$ WSAGetLastError$())$;

freeaddrinfo$($result$)$;

WSACleanup$()$;

return $1$;

$\}$

iResult $=$ bind$($ListenSocket$,$ result$->$ai$\_$addr, $($int$)$result$->$ai$\_$addrlen$)$;

if $($iResult $==$ SOCKET$\_$ERROR$)\{$

printf$("$bind failed with error: $\%$d

$",$ WSAGetLastError$())$;

freeaddrinfo$($result$)$;

closesocket$($ListenSocket$)$;

WSACleanup$()$;

return $1$;

$\}$

freeaddrinfo$($result$)$;

iResult $=$ listen$($ListenSocket$,$ SOMAXCONN$)$;

if $($iResult $==$ SOCKET$\_$ERROR$)\{$

printf$("$listen failed with error: $\%$d

$",$ WSAGetLastError$())$;

closesocket$($ListenSocket$)$;

WSACleanup$()$;

return $1$;

$\}$

printf$("$Waiting for client to connect...

$")$;

ClientSocket $=$ accept$($ListenSocket$,$ NULL, NULL$)$;

if $($ClientSocket $==$ INVALID$\_$SOCKET$)\{$

printf$("$accept failed with error: $\%$d

$",$ WSAGetLastError$())$;

closesocket$($ListenSocket$)$;

WSACleanup$()$;

return $1$;

$\}$

closesocket$($ListenSocket$)$;

char sendbuf$[$DEFAULT$\_$BUFLEN$]$;

printf$("$Client connected. Type 'kick' to disconnect the client.

$")$;

while $(1)\{$

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

if $($iResult $>0)\{$

recvbuf$[$iResult$]=\text{'}\backslash 0\text{'}$;

printf$("$Client: $\%$s

$",$ recvbuf$)$;

if $($strcmp$($recvbuf$,$ "quit"$)==0)\{$

printf$("$Client disconnected.

$")$;

break;

$\}$

printf$("$Enter message: $")$;

fgets$($sendbuf$,$ DEFAULT$\_$BUFLEN, stdin$)$;

sendbuf$[$strcspn$($sendbuf$,"$

$")]=0$;

iResult $=$ send$($ClientSocket$,$ sendbuf$,($int$)$strlen$($sendbuf$),0)$;

if $($iResult $==$ SOCKET$\_$ERROR$)\{$

printf$("$send failed with error: $\%$d

$",$ WSAGetLastError$())$;

closesocket$($ClientSocket$)$;

WSACleanup$()$;

return $1$;

$\}$

if $($strcmp$($sendbuf$,$ "kick"$)==0)\{$

printf$("$Client kicked.

$")$;

break;

$\}$

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