[IOCP] 리스트와 iocp를 이용한 Echo서버 소스

c 기반 iocp + list echo서버 소스입니다.

list 객체를 이용하여 접속되는 클라이언트를 list에 넣고 클라이언트에서 날아오는 메시지를 모든 클라이언트들에게 다시 에코서비스하는 소스입니다. 

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#include <winsock2.h> #include <stdlib.h> #include <stdio.h> #include <iostream> #include <list> #include <process.h>   CRITICAL_SECTION cs;   using namespace std;   #define BUFSIZE 512   //#define IO_ACCEPT    1 //#define IO_READ        0 // 소켓 정보 저장을 위한 구조체 typedef enum IO_TYPE { IO_READ, IO_ACCEPT }; struct SOCKETINFO {     OVERLAPPED overlapped;     SOCKET sock;     IO_TYPE    io_type;     char buf[BUFSIZE+1];     WSABUF wsabuf; }; list<SOCKETINFO*> g_sock;   // 소켓 입출력 함수 DWORD WINAPI WorkerThread(LPVOID arg); // 오류 출력 함수 void err_quit(char *msg); void err_display(char *msg);   int main(int argc, char* argv[]) {     InitializeCriticalSection(&cs);     int retval;       // 윈속 초기화     WSADATA wsa;     if(WSAStartup(MAKEWORD(2,2), &wsa) != 0)         return -1;       // 입출력 완료 포트 생성     HANDLE hcp = CreateIoCompletionPort(         INVALID_HANDLE_VALUE, NULL, 0, 0);     if(hcp == NULL) return -1;       // CPU 개수 확인     SYSTEM_INFO si;     GetSystemInfo(&si);       // (CPU 개수 * 2)개의 작업자 스레드 생성     HANDLE hThread;     DWORD ThreadId;     for(int i=0; i<(int)si.dwNumberOfProcessors*2; i++){         hThread = CreateThread(NULL, 0, WorkerThread, hcp, 0, &ThreadId);         if(hThread == NULL) return -1;         CloseHandle(hThread);     }       // socket()     SOCKET listen_sock = socket(AF_INET, SOCK_STREAM, 0);     if(listen_sock == INVALID_SOCKET) err_quit("socket()");       // bind()     SOCKADDR_IN serveraddr;     ZeroMemory(&serveraddr, sizeof(serveraddr));     serveraddr.sin_family = AF_INET;     serveraddr.sin_port = htons(9000);     serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);     retval = bind(listen_sock, (SOCKADDR *)&serveraddr, sizeof(serveraddr));     if(retval == SOCKET_ERROR) err_quit("bind()");          // listen()     retval = listen(listen_sock, SOMAXCONN);     if(retval == SOCKET_ERROR) err_quit("listen()");       while(1){         // accept()         SOCKADDR_IN clientaddr;         int addrlen = sizeof(clientaddr);         SOCKET client_sock = accept(listen_sock, (SOCKADDR *)&clientaddr, &addrlen);         if(client_sock == INVALID_SOCKET){             err_display("accept()");             continue;         }         printf("[TCP 서버] 클라이언트 접속: IP 주소=%s, 포트 번호=%d\n",              inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));           // 소켓과 입출력 완료 포트 연결         HANDLE hResult = CreateIoCompletionPort((HANDLE)client_sock, hcp,              (DWORD)client_sock, 0);         if(hResult == NULL) return -1;           // 소켓 정보 구조체 할당         SOCKETINFO *ptr = new SOCKETINFO;         if(ptr == NULL){             printf("[오류] 메모리가 부족합니다!\n");             break;         }         g_sock.push_back(ptr);           ZeroMemory(&(ptr->overlapped), sizeof(ptr->overlapped));         ptr->sock = client_sock;         ptr->wsabuf.buf = ptr->buf;         ptr->wsabuf.len = BUFSIZE;         ptr->io_type = IO_ACCEPT;           // 비동기 입출력 시작         DWORD recvbytes;         DWORD flags = 0;         retval = WSARecv(client_sock, &(ptr->wsabuf), 1, &recvbytes,             &flags, &(ptr->overlapped), NULL);         if(retval == SOCKET_ERROR){             if(WSAGetLastError() != ERROR_IO_PENDING){                 err_display("WSARecv()0");             }             continue;         }     }          closesocket(listen_sock);       list<SOCKETINFO*>::iterator it = g_sock.begin();     while(it != g_sock.end())     {         SOCKETINFO *a = *it;         closesocket(a->sock);         g_sock.remove(a);         it++;     }     g_sock.clear();       // 윈속 종료     WSACleanup();     DeleteCriticalSection(&cs);     return 0; }   DWORD WINAPI WorkerThread(LPVOID arg) {     HANDLE hcp = (HANDLE)arg;     int retval;     DWORD cbTransferred;     SOCKET client_sock;     SOCKETINFO *ptr = NULL;          while(1)     {         // 비동기 입출력 완료 기다리기         retval = GetQueuedCompletionStatus(hcp, &cbTransferred,    (LPDWORD)&client_sock, (LPOVERLAPPED *)&ptr, INFINITE);           // 클라이언트 정보 얻기         SOCKADDR_IN clientaddr;         int addrlen = sizeof(clientaddr);         getpeername(ptr->sock, (SOCKADDR *)&clientaddr, &addrlen);                  // 연결종료?         if(retval == 0 || cbTransferred == 0)         {             if(retval == 0)             {                 DWORD temp1, temp2;                 WSAGetOverlappedResult(ptr->sock, &(ptr->overlapped), &temp1, FALSE, &temp2);                 err_display("WSAGetOverlappedResult()");             }               EnterCriticalSection(&cs);             g_sock.remove((SOCKETINFO*)ptr);             LeaveCriticalSection(&cs);               closesocket(ptr->sock);             printf("[TCP 서버] 클라이언트 종료: IP 주소=%s, 포트 번호=%d\n",                              inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));             delete ptr;             continue;         }           if(ptr)    // 정상적인 데이터?         {             ptr->buf[cbTransferred] = NULL;             ////////////////////////             //  프로토콜 처리 시작             if(ptr->io_type == IO_ACCEPT)    // 접속 후 처리             {                 printf("초기 데이터 : %s\n", ptr->buf);                 printf("사이즈 : %d\n", g_sock.size());                 // 데이터 에코처리                   EnterCriticalSection(&cs);                 list<SOCKETINFO*>::iterator it = g_sock.begin();                 while(it != g_sock.end())                 {                     SOCKETINFO*a = *it;                     send(a->sock, ptr->buf, cbTransferred, 0);                     it++;                 }                 LeaveCriticalSection(&cs);             }             else if(ptr->io_type == IO_READ)    // 전송IO작업이 끝나면 여기로옴 데이터 받은 후 처리             {                 printf("READ 데이터 : %s\n", ptr->buf);                   // 데이터 에코처리 //                send(ptr->sock, ptr->buf, cbTransferred, 0);                   EnterCriticalSection(&cs);                 list<SOCKETINFO*>::iterator it = g_sock.begin();                 while(it != g_sock.end())                 {                     SOCKETINFO*a = *it;                     send(a->sock, ptr->buf, cbTransferred, 0);                     it++;                 }                 LeaveCriticalSection(&cs);             }             ///////////////////////             //  프로토콜 처리 종료             //             //               //////////////////////////////////////             // 처리후 다시 데이터 받음////////////             ZeroMemory(&(ptr->overlapped), sizeof(ptr->overlapped));             ptr->wsabuf.buf = ptr->buf;             ptr->wsabuf.len = BUFSIZE;             ptr->io_type = IO_READ;               DWORD recvbytes;             DWORD flags = 0;             retval = WSARecv(ptr->sock, &(ptr->wsabuf), 1, &recvbytes, &flags, &(ptr->overlapped), NULL);             if(retval == SOCKET_ERROR){                 if(WSAGetLastError() != WSA_IO_PENDING){                     err_display("WSARecv()1");                 }                 continue;             }             //////////////////////////////////////         }     }       return 0; }   // 소켓 함수 오류 출력 후 종료 void err_quit(char *msg) {     LPVOID lpMsgBuf;     FormatMessage(          FORMAT_MESSAGE_ALLOCATE_BUFFER|         FORMAT_MESSAGE_FROM_SYSTEM,         NULL, WSAGetLastError(),         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),         (LPTSTR)&lpMsgBuf, 0, NULL);     MessageBox(NULL, (LPCTSTR)lpMsgBuf, msg, MB_ICONERROR);     LocalFree(lpMsgBuf);     exit(-1); }   // 소켓 함수 오류 출력 void err_display(char *msg) {     LPVOID lpMsgBuf;     FormatMessage(          FORMAT_MESSAGE_ALLOCATE_BUFFER|         FORMAT_MESSAGE_FROM_SYSTEM,         NULL, WSAGetLastError(),         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),         (LPTSTR)&lpMsgBuf, 0, NULL);     printf("[%s] %s", msg, (LPCTSTR)lpMsgBuf);     LocalFree(lpMsgBuf); }