1. 根据select TCP服务器流程图编写服务器(上交)
#include
#define ERR_MSG(msg) do{\
fprintf(stderr,"__%d__",__LINE__);\
perror(msg);\
}while(0)
#define PORT 6666
#define IP "192.168.114.50"
int main(int argc, const char *argv[])
{
//创建流式套接字
int sfd=socket(AF_INET,SOCK_STREAM,0);
if(sfd<0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success! sfd=%d\n",sfd);
//允许端口快速被复用
int reuse=1;
if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))<0)
{
ERR_MSG("setsockopt");
return -1;
}
printf("允许端口快速被复用成功\n");
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(PORT);
sin.sin_addr.s_addr=inet_addr(IP);
if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin))<0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
if(listen(sfd,128)<0)
{
ERR_MSG("listen");
return -1;
}
//创建一个读的集合
fd_set readfds,tempfds;
//清空集合
FD_ZERO(&readfds);
//将需要监测的文件描述符放入到集合中
FD_SET(0,&readfds);
FD_SET(sfd,&readfds);
int maxfd=sfd;
char buf[128]="";
ssize_t res=-1;
int newfd=-1;
int s_res=-1;
struct sockaddr_in savaCin[1024];
struct sockaddr_in cin;
socklen_t addrlen=sizeof(cin);
while(1)
{
tempfds=readfds;
s_res=select(maxfd+1,&tempfds,NULL,NULL,NULL);
if(s_res<0)
{
ERR_MSG("select");
return -1;
}
if(0==s_res)
{
printf("time out..\n");
break;
}
printf("__%d__\n",__LINE__);
for(int i=0;i<=maxfd;i++)
{
if(FD_ISSET(i,&tempfds)==0)
{
continue;
}
if(0==i)
{
printf("触发键盘输入事件\n");
bzero(buf,sizeof(buf));
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]=0;
printf("输出:%s\n",buf);
}
else if(sfd==i)
{
printf("触发客户端连接事件\n");
newfd=accept(i,(struct sockaddr*)&cin,&addrlen);
if(newfd<0)
{
ERR_MSG("accept");
return -1;
}
printf("[%s:%d]客户端连接成功newfd=%d\n",\
inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
FD_SET(newfd,&readfds);
savaCin[newfd]=cin;
maxfd=maxfd>newfd?maxfd:newfd;
}
else
{
printf("触发客户端交互事件\n");
//清空字符串
bzero(buf,sizeof(buf));
//接收
res=recv(i,buf,sizeof(buf),0);
if(res<0)
{
ERR_MSG("recv");
return -1;
}
if(0==res)
{
printf("[%s:%d]客户端下线newfd=%d\n",\
inet_ntoa(savaCin[i].sin_addr),ntohs(savaCin[i].sin_port),i);
close(i);
FD_CLR(i,&readfds);
for(;maxfd>=0;maxfd--)
{
if(FD_ISSET(maxfd,&readfds))
{
break;
}
}
continue;
}
printf("[%s:%d]newfd=%d:%s\n",\
inet_ntoa(savaCin[i].sin_addr),ntohs(savaCin[i].sin_port),i,buf);
//发送
strcat(buf,"zyz");
if(send(i,buf,sizeof(buf),0)<0)
{
ERR_MSG("send");
return -1;
}
printf("send success\n");
}
}
}
if(close(sfd)<0)
{
ERR_MSG("close");
return -1;
}
return 0;
}
思维导图:https://mubu.com/app/edit/home/4LfFX79g2CD#m