c linux socket

#include<stdio.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<errno.h>
#include<unistd.h>
#include<string.h>
#include<sys/types.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#define _PORT_ 9999
#define _BACKLOG_ 10
int main()
{
int sock=socket(AF_INET,SOCK_STREAM,0);
if(sock<0)
{
printf("socket()\n");
}
struct sockaddr_in server_socket;
struct sockaddr_in socket;
bzero(&server_socket,sizeof(server_socket));
server_socket.sin_family=AF_INET;
server_socket.sin_addr.s_addr=htonl(INADDR_ANY);
server_socket.sin_port=htons(_PORT_);
if(bind(sock,(struct sockaddr*)&server_socket,sizeof(struct sockaddr_in))<0)
{
printf("bind failed\n");
close(sock);
return 1;
}
if(listen(sock,_BACKLOG_)<0)
{
printf("listen failed\n");
close(sock);
return 2;
}
printf("create server success\n");
for(;;)
{
socklen_t len=0;
int client_sock=accept(sock,(struct sockaddr*)&socket,&len);
if(client_sock<0)
{
printf("accept()\n");
return 3;
}
char buf_ip[INET_ADDRSTRLEN];
memset(buf_ip,'\0',sizeof(buf_ip));

inet_ntop(AF_INET,&socket.sin_addr,buf_ip,sizeof(buf_ip));

printf("get connect\n");

while(1)
{
char buf[1024];
memset(buf,'\0',sizeof(buf));
read(client_sock,buf,sizeof(buf));

printf("client:# %s\n",buf);

printf("server:$ ");

memset(buf,'\0',sizeof(buf));

fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
if(strncasecmp(buf,"quit",4)==0)
{
printf("quit\n");
break;
}
write(client_sock,buf,strlen(buf)+1);
printf("wait...\n");
}
close(client_sock);
}
close(sock);
return 0;
}

 

 

 

 

#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<string.h>
#include<errno.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<sys/types.h>
#define SERVER_PORT 9999
int main(int argc,char* argv[])
{
if(argc!=2)
{
printf("Usage:client IP\n");
return 1;
}
char *str=argv[1];
char buf[1024];
memset(buf,'\0',sizeof(buf));

struct sockaddr_in server_sock;
int sock = socket(AF_INET,SOCK_STREAM,0);
bzero(&server_sock,sizeof(server_sock));
server_sock.sin_family=AF_INET;
inet_pton(AF_INET,str,&server_sock.sin_addr);
server_sock.sin_port=htons(SERVER_PORT);

int ret=connect(sock,(struct sockaddr *)&server_sock,sizeof(server_sock));
if(ret<0)
{
printf("connect()\n");
return 1;
}
printf("connect success\n");

while(1)
{
printf("client:# ");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1]='\0';
write(sock,buf,sizeof(buf));
if(strncasecmp(buf,"quit",4)==0)
{
printf("quit\n");
break;
}
printf("wait..\n");
read(sock,buf,sizeof(buf));
printf("server:$ %s\n",buf);
}
close(sock);
return 0;
}