服务器
#include <myhead.h>
#define SERIP "192.168.125.99"
#define SERPORT 9999
int main(int argc, const char *argv[])
{int sfd=-1;if((sfd=socket(AF_INET,SOCK_STREAM,0))==-1){perror("socket error");return -1;}printf("sfd=%d\n",sfd);int reuse=1;if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family=AF_INET;sin.sin_port=htons(SERPORT);sin.sin_addr.s_addr=inet_addr(SERIP);struct sockaddr_in cin;socklen_t socklen=sizeof(cin);struct sockaddr_in newsin[1024];char name[1024][128];if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1){perror("bind error");return -1;}printf("bind success\n");if(listen(sfd,128)==-1){perror("listen error");return -1;}printf("listen success\n");int res=-1;char rbuf[128]="";char wbuf[128]="";struct pollfd fds[1024];for(int i=0;i<1024;i++){fds[i].fd=-1;fds[i].events=POLLIN;}fds[0].fd=0;fds[0].events=POLLIN;//insert_rear("服务器输入"，head);fds[3].fd=sfd;fds[3].events=POLLIN;//insert_rear("连接用",head);while(1){res=poll(fds,1024,-1);if(res<0){perror("poll error");return -1;}else if(res==0){printf("time out\n");return -1;}if(fds[0].revents==POLLIN){bzero(rbuf,sizeof(rbuf));bzero(wbuf,sizeof(wbuf));fgets(rbuf,sizeof(rbuf),stdin);rbuf[strlen(rbuf)-1]=0;strcat(wbuf,"服务器: ");strcat(wbuf,rbuf);strcpy(rbuf,wbuf);for(int i=4;i<1024;i++){send(fds[i].fd,rbuf,sizeof(rbuf),0);}}//负责连接else if(fds[3].revents==POLLIN){int newfd=-1;if((newfd=accept(sfd,(struct sockaddr*)&cin,&socklen))==-1){perror("connect error");return -1;}newsin[newfd]=cin;printf("[%s:%d]connect success\n",inet_ntoa(newsin[newfd].sin_addr),ntohs(newsin[newfd].sin_port));fds[newfd].fd=newfd;}for(int i=4;i<1024;i++){//服务器端输入if(fds[i].revents!=POLLIN){continue;}{ //表示其余待触发poll bzero(rbuf,sizeof(rbuf));char lbuf[128]="";int f=recv(fds[i].fd,rbuf,sizeof(rbuf),0);if(rbuf[0]=='N'){char *p=rbuf;p=p+1;strcpy(name[i],p);sprintf(lbuf,"------------%s已上线-----------",name[i]);for(int j=4;j<1024;j++){send(fds[j].fd,lbuf,sizeof(lbuf),0);}continue;}if(strcmp(rbuf,"quit")==0){sprintf(lbuf,"[%s:%d]%s已下线",inet_ntoa(newsin[i].sin_addr),ntohs(newsin[i].sin_port),name[i]);close(fds[i].fd);newsin[i].sin_addr.s_addr=0;newsin[i].sin_port=0;fds[i].fd=-1;for(int k=4;k<1024;k++){ send(fds[k].fd,lbuf,sizeof(lbuf),0); }send(fds[0].fd,lbuf,sizeof(lbuf),0);continue;}bzero(lbuf,sizeof(lbuf));char *p=rbuf;p=p+1;strcpy(lbuf,p);sprintf(wbuf,"[%s:%d]%s:%s",inet_ntoa(newsin[i].sin_addr),ntohs(newsin[i].sin_port),name[i],lbuf);for(int j=4;j<1024;j++){if(j==i){continue;}send(fds[j].fd,wbuf,sizeof(wbuf),0);}}}}close(sfd);return 0;
}
客户端
#include <myhead.h>
#define SERIP "192.168.125.99"
#define SERPORT 9999int main(int argc, const char *argv[])
{int cfd=-1;if((cfd=socket(AF_INET,SOCK_STREAM,0))==-1){perror("socket error");return -1;}printf("cfd=%d\n",cfd);int reuse=1;if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family=AF_INET;sin.sin_port=htons(SERPORT);sin.sin_addr.s_addr=inet_addr(SERIP);if((connect(cfd,(struct sockaddr*)&sin,sizeof(sin)))==-1){perror("connect error");return -1;}printf("connect success\n");struct pollfd fds[2];fds[0].fd=0;fds[0].events=POLLIN;fds[1].fd=cfd;fds[1].events=POLLIN;int flag=0;char rbuf[128]="";char buf[128]="";char n[129]="N";char s[129]="S";char q[129]="quit";int res=-1;while(1){res=poll(fds,2,-1);if(res<0){perror("poll error");return -1;}else if(res==0){printf("time out\n");return -1;}if(fds[0].revents==POLLIN){if(flag==0){//输入名字bzero(buf,sizeof(buf));bzero(rbuf,sizeof(rbuf));fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1]=0;strcat(rbuf,n);strcat(rbuf,buf);send(cfd,rbuf,sizeof(rbuf),0);flag=1;}else{//输入信息bzero(buf,sizeof(buf));bzero(rbuf,sizeof(rbuf));fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1]=0;if(strcmp(q,buf)==0){send(cfd,buf,sizeof(buf),0);goto END;}strcat(rbuf,s);strcat(rbuf,buf);send(cfd,rbuf,sizeof(rbuf),0);}}if(fds[1].revents==POLLIN){bzero(rbuf,sizeof(rbuf));recv(cfd,rbuf,sizeof(rbuf),0);printf("%s\n",rbuf);}}
END:close(cfd);return 0;
}
 ）)
