linux tcp server demo

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#include <sys/types.h>  #include <sys/socket.h>  #include <string.h>  #include <netinet/in.h>  #include <stdio.h>  #include <stdlib.h>      #define MAXLINE 80  #define SERV_PORT 6970    void do_echo(int sockfd, struct sockaddr *pcliaddr, socklen_t clilen) {    int n;    socklen_t len;    char mesg[MAXLINE];     for(;;)   {     len = clilen;     /* waiting for receive data */      n = recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len);     /* sent data back to client */     printf("receieve: %s\n",mesg);     fflush ( stdout ) ;     sendto(sockfd, mesg, n, 0, pcliaddr, len);      }  }     int main(void)  {  int sockfd;  struct sockaddr_in servaddr, cliaddr;  sockfd = socket(AF_INET, SOCK_DGRAM, 0); /* create a socket */     /* init servaddr */  bzero(&servaddr, sizeof(servaddr));  servaddr.sin_family = AF_INET;  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);  servaddr.sin_port = htons(SERV_PORT);    /* bind address and port to socket */  if(bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) == -1) {  perror("bind error");  exit(1);  }     do_echo(sockfd, (struct sockaddr *)&cliaddr, sizeof(cliaddr));     return 0;  }