高性能socket通信

 

client.c

#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <netdb.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#define MAXDATASIZE 100 /*每次最大数据传输量 *//**********************************************************************filename: client.c*purpose: 循环tcp客户端程序*********************************************************************/int main(int argc, char *argv[]){ int clientSocket, numbytes; char buf[MAXDATASIZE]; struct hostent *he; struct sockaddr_in server_addr; unsigned int server_port; if(argv[2]) server_port = atoi(argv[2]); else server_port = 7838; if (argc != 3) { fprintf(stderr,"usage: %s hostname port/n", argv[0]); exit(1); } if((he=gethostbyname(argv[1]))==NULL) { herror("error:gethostbyname"); exit(1); } if ((clientSocket = socket(PF_INET, SOCK_STREAM, 0)) == -1) { perror("error:socket"); exit(1); } server_addr.sin_family=PF_INET; server_addr.sin_port=htons(server_port); server_addr.sin_addr = *((struct in_addr *)he->h_addr); bzero(&(server_addr.sin_zero),0); if (connect(clientSocket, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) { perror("error:connect"); exit(1); } while(1) { //memset(buf,0,MAXDATASIZE); printf("send:>"); scanf("%s",buf); if(strcmp(buf,"cquit")==0) { printf("client exit/n"); printf("send cquit to server..."); send(clientSocket,buf,sizeof(buf),0); printf("ok/n"); break; } else if(strcmp(buf,"squit")==0) { send(clientSocket,buf,sizeof(buf),0); printf("server and client will exit/n"); break; } else { printf("send data to server..."); send(clientSocket,buf,sizeof(buf),0); printf("ok/n"); } if ((numbytes=recv(clientSocket, buf, MAXDATASIZE, 0)) == -1) { perror("error:recv"); printf("error:recv"); exit(1); } buf[numbytes] = 0; printf("Received: %s/n",buf); } close(clientSocket);}

//多进程服务

server.c

#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include <sys/wait.h>#include <pthread.h>//#include <signal.h>/**********************************************************************filename: server.c*purpose: 循环tcp服务端程序*********************************************************************/void *processchild(int clientSocket){ char buffer[256]; int iDataNum; printf("child process start/n"); while(1) { iDataNum=recv(clientSocket,buffer,255,0); if(strcmp(buffer,"cquit")==0) { printf("recv exit cmd from client/n"); close(clientSocket); break; } buffer[iDataNum]=0; printf("recv data from client:%s/n",buffer); printf("send data to client..."); int error=send(clientSocket,buffer,strlen(buffer),0); if(error<0)break; printf("ok/n"); printf("child process stop/n");} int main(int argc, char ** argv){ int serverSocket,new_client; /* 监听socket: sock_fd,client socket: new_client */ struct sockaddr_in server_addr; /* 本机地址信息 */ struct sockaddr_in client_addr; /* 客户地址信息 */ unsigned int sin_size, server_port, lisnum; if(argv[1]) server_port = atoi(argv[1]); else server_port = 7838; if(argv[2]) lisnum = atoi(argv[2]); else lisnum = 2; printf("server start.../n"); //socket if ((serverSocket = socket(PF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); } //addr server_addr.sin_family=PF_INET; server_addr.sin_port=htons(server_port); server_addr.sin_addr.s_addr = INADDR_ANY; bzero(&(server_addr.sin_zero), 0); //bind if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) { perror("error:bind"); exit(1); } //listen if (listen(serverSocket, lisnum) == -1) { perror("error:listen"); exit(1); } while(1) { sin_size = sizeof(struct sockaddr_in); //accept new_client = accept(serverSocket, (struct sockaddr *)&client_addr, &sin_size); if (new_client == -1) { perror("error:accept"); continue; } printf("server: got connection from %s/n",inet_ntoa(client_addr.sin_addr)); //new process int child_pid=fork(); if(child_pid>0)//parent process { close(new_client); printf("parent process with ID %d ,add child process with ID %d/n",(int)getpid(),child_pid); continue; } else if (child_pid==0)//子进程代码段 { printf("new child process with ID %d/n",(int)getpid()); close(serverSocket); processchild(new_client); exit(0); } else//child process fork fail { printf("error: fork child process!!!!"); } close(new_client); /*父进程不再需要该socket*/ //waitpid(-1,NULL,WNOHANG);/*等待子进稅 } close(serverSocket);}

//多线程TCP服务

 #include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include <sys/wait.h>#include <pthread.h>//#include <signal.h>/**********************************************************************filename: server.c*purpose: 循环tcp服务端程序*********************************************************************/void *processchild(void *para){ int clientSocket; char buffer[256]; int iDataNum; clientSocket=*((int *)para); printf("new thread start/n"); while(1) { iDataNum=recv(clientSocket,buffer,255,0); if(strcmp(buffer,"cquit")==0) { printf("recv exit cmd from client/n"); close(clientSocket); break; } buffer[iDataNum]=0; printf("recv data from client:%s/n",buffer); printf("send data to client..."); int error=send(clientSocket,buffer,strlen(buffer),0); if(error<0)break; printf("ok/n"); } //pthread_exit(NULL); printf("new thread finished/n");} int main(int argc, char ** argv){ int serverSocket,new_client; /* 监听socket: sock_fd,client socket: new_client */ struct sockaddr_in server_addr; /* 本机地址信息 */ struct sockaddr_in client_addr; /* 客户地址信息 */ unsigned int sin_size, server_port, lisnum; if(argv[1]) server_port = atoi(argv[1]); else server_port = 7838; if(argv[2]) lisnum = atoi(argv[2]); else lisnum = 2; printf("server start.../n"); //socket if ((serverSocket = socket(PF_INET, SOCK_STREAM, 0)) == -1) { perror("socket"); exit(1); } //addr server_addr.sin_family=PF_INET; server_addr.sin_port=htons(server_port); server_addr.sin_addr.s_addr = INADDR_ANY; bzero(&(server_addr.sin_zero), 0); //bind if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) { perror("error:bind"); exit(1); } //listen if (listen(serverSocket, lisnum) == -1) { perror("error:listen"); exit(1); } while(1) { sin_size = sizeof(struct sockaddr_in); //accept new_client = accept(serverSocket, (struct sockaddr *)&client_addr, &sin_size); if (new_client == -1) { perror("error:accept"); continue; } printf("server: got connection from %s/n",inet_ntoa(client_addr.sin_addr)); //new thread pthread_t threadid; int tmp=pthread_create(&threadid,NULL,processchild,(void *)&new_client); //waitpid(-1,NULL,WNOHANG);/*等待子进稅 } close(serverSocket);}