linux下socket编程学习

最近今天在看socket编程，参考网上的例子，自己写了一个服务器回射程序，服务器端想用线程处理消息，但是线程这块还没想好怎么弄，现在只能规定一个最大的连接次数，超过这个次数服务器就结束了。

下面是代码：

server.c

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<sys/socket.h>#include<sys/types.h>#include<netinet/in.h>#include<unistd.h>#include<error.h>#include<errno.h>#include<arpa/inet.h>#include<pthread.h>#define MAX_LEN 100#define PORT_NUM 4321#define EXIT_FAIL_NUM 1#define MAX_NUM 3void trans(void *p);struct trans_data{int fd;char buff[MAX_LEN];struct sockaddr_in info;};int main(){int sockfd,confd,len,err,i=0;pthread_t thread[MAX_NUM];struct sockaddr_in ser,cli;if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0){perror("socket");exit(EXIT_FAIL_NUM);}printf("scoket_fd = %d\n",sockfd);bzero(&ser,sizeof(ser));ser.sin_family = AF_INET;ser.sin_port = htons(PORT_NUM);ser.sin_addr.s_addr = htonl(INADDR_ANY);if(-1 == bind(sockfd,(struct sockaddr *)&ser,sizeof(ser))){perror("bind");exit(EXIT_FAIL_NUM);}if(0 != listen(sockfd,10)){perror("listen");exit(EXIT_FAIL_NUM);}printf("Receive message......\n");while(i<MAX_NUM){len = sizeof(cli);confd = accept(sockfd,(struct sockaddr *)&cli,&len);if(-1 == confd){perror("accept");exit(EXIT_FAIL_NUM);} struct trans_data p;p.fd = confd;memcpy(&p.info,&cli,sizeof(p.info));err = pthread_create(&thread[i],NULL,(void *)&trans,(void *)&p);if(0 != err){printf("Can not create thread!\n");exit(EXIT_FAIL_NUM);}i++;}return 0;}void trans(void *p){struct trans_data *ptr;ptr = (struct trans_data *)p;while(1){memset((*ptr).buff,0,sizeof((*ptr).buff));int len;len = recv((*ptr).fd,(*ptr).buff,sizeof((*ptr).buff),0);        if(len ==0){            pthread_exit(NULL);        }printf("Message from:\n IP address:%s\t",inet_ntoa((struct in_addr )(*ptr).info.sin_addr));printf("port number=%d\n",(*ptr).info.sin_port);puts((*ptr).buff);}}

client.c

#include<stdio.h>#include<stdlib.h>#include<sys/socket.h>#include<sys/types.h>#include<netinet/in.h>#include<unistd.h>#include<string.h>#include<error.h>#include<errno.h>#define MAX_LEN 100#define EXIT_FAIL 1#define PORT_NUM 4321int main(){int sockfd,confd,len;char buff[MAX_LEN];struct sockaddr_in cli,ser;if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1){perror("socket");exit(EXIT_FAIL);}printf("socket_fd = %d\n",sockfd);bzero(&ser,sizeof(struct sockaddr_in));ser.sin_family = AF_INET;ser.sin_addr.s_addr = inet_addr("127.0.0.1");ser.sin_port = htons(PORT_NUM);printf("s_addr = %#x,port:%#x\r\n",ser.sin_addr.s_addr,ser.sin_port);if((confd = connect(sockfd,(struct sockaddr *)&ser,sizeof(struct sockaddr))) == -1){perror("connect");exit(EXIT_FAIL);}printf("client connected......\n");memset(buff,0,sizeof(buff));while(scanf("%s",buff)!=EOF){len = send(sockfd,buff,strlen(buff),0);if(len == -1){perror("send");exit(EXIT_FAIL);}memset(buff,0,sizeof(buff));}    close(sockfd);return 0;}