Linux下cs简单通讯(socket)

Server：

 #include<iostream>
 #include<sys/types.h>
 #include<sys/socket.h>
 #include<arpa/inet.h>
 #include<unistd.h>
 #include <errno.h>
 #include<string.h>

 #define PORT 10004

 using namespace std;

 void showError()
 {
     cout<<"Error : "<<strerror(errno)<<" Error code : "<<errno<<endl;
 }

 int main()
 {
     int ss,sc;
     struct sockaddr_in server_addr,client_addr,peer_addr;
     char conn_ip[INET_ADDRSTRLEN];
     int err;
     ss=socket(AF_INET, SOCK_STREAM ,);
     if(ss<){
         showError();
         return -;
     }
     cout<<"Init Socket"<<endl;

     bzero(&server_addr,sizeof(server_addr));
     server_addr.sin_family=AF_INET;
     server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
     server_addr.sin_port=htons(PORT);

     err=bind(ss,(struct sockaddr *)&server_addr,sizeof(server_addr));
     if(err<){
         showError();
         return -;
     }
     cout<<"Bind"<<endl;

     err=listen(ss,);
     if(err<){
         showError();
         return -;
     }
     cout<<"Waiting for connect..."<<endl;

     while(true){
         socklen_t addrlen=sizeof(struct sockaddr);
         sc=accept(ss,(struct sockaddr*)&client_addr,&addrlen);
         if(sc==-){
             showError();
             continue;
         } else {
             int peer_len=sizeof(peer_addr);
             getpeername(sc,(struct sockaddr *)&peer_addr,(socklen_t *)&peer_len);
             cout<<"Connect from "<<inet_ntop(AF_INET,&peer_addr.sin_addr,conn_ip,sizeof(conn_ip))<<". : "<<ntohs(peer_addr.sin_port)<<endl;
             ssize_t size=;
             char buffer[];
             while(true){
                 size=read(sc,buffer,);
                 if(size<=){
                     showError();
                     continue;
                 }
                 cout<<"Get message: "<<buffer<<endl;
                 cout<<"Send : "<<endl;
                 cin>>buffer;
                 write(sc,buffer,strlen(buffer)+);
             }
         }
     }
     return ;
 }

Client：

 #include<iostream>
 #include<string.h>
 #include<sys/types.h>
 #include<sys/socket.h>
 #include<arpa/inet.h>
 #include<unistd.h>

 #define PORT 10004

 using namespace std;

 int main(int argc,char *argv[])
 {
     int s;
     struct sockaddr_in server_addr;

     s=socket(AF_INET,SOCK_STREAM,);
     if(s<){
         cout<<"Init socket error"<<endl;
         return -;
     }
     bzero(&server_addr,sizeof(server_addr));
     server_addr.sin_family=AF_INET;
     server_addr.sin_port=htons(PORT);
     inet_pton(AF_INET, argv[], &server_addr.sin_addr);

     cout<<"Waiting for connect to "<<argv[]<<"."<<endl;

     while(true){
         int err=connect(s,(struct sockaddr*)&server_addr,sizeof(server_addr));
         if(err==-){
             cout<<"Conn Error."<<endl;
         } else {
             ssize_t size=;
             char buffer[];
             while(true){
                 cout<<"Send msg:"<<endl;
                 cin>>buffer;
                 write(s,buffer,strlen(buffer)+);
                 size=read(s,buffer,);
                 cout<<"Message from server: "<<buffer<<endl;
             }
         }
     }
     return ;
 }