UDP简单实现并发服务器和客户端简单通信

来源：互联网发布：什么社交软件好编辑：程序博客网时间：2024/05/16 06:08

以下程序均未做错误处理，以后有时间一定补上

客户端

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <netinet/in.h>#include <sys/socket.h>int main(int argc,char **argv){int sockfd;int n;struct sockaddr_in servaddr;char readbuf[1000];char sendbuf[1000];sockfd = socket(AF_INET,SOCK_DGRAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr = inet_addr(argv[1]);servaddr.sin_port = htons(3200);while(fgets(sendbuf,1000,stdin) != NULL){sendto(sockfd,sendbuf,strlen(sendbuf),0,(struct sockaddr *)&servaddr,sizeof(servaddr));n = recvfrom(sockfd,readbuf,1000,0,NULL,NULL);readbuf[n] = '\0';fputs(readbuf,stdout);}close(sockfd);return 0;}

服务器

#include <stdio.h>#include <string.h>#include <stdlib.h>#include <netinet/in.h>#include <sys/socket.h>void strlwr(char *str){char *p;p = str;while(*p != '\0'){if((*p >= 'a') && (*p <= 'z')){*p -= 32;}p++;}}int main(){int sockfd;int n;struct sockaddr_in servaddr,cliaddr;char mesg[1000];socklen_t clilen;sockfd = socket(AF_INET,SOCK_DGRAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr = htonl(INADDR_ANY);servaddr.sin_port = htons(3200);bind(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr));clilen = sizeof(cliaddr);for(;;){for(;;){n = recvfrom(sockfd,mesg,1000,0,(struct sockaddr*)&cliaddr,&clilen);if(n == 0){printf("client closed");exit(-1);}printf("******************\n");mesg[n] = '\0';printf("%s\n",mesg);printf("*******************\n");strlwr(mesg);sendto(sockfd,mesg,n,0,(struct sockaddr*)&cliaddr,sizeof(cliaddr));}//close(sockfd);}close(sockfd);    return 0;}

0 0