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server.c

#include <stdio.h>
#include <stdlib.h>

#include <netdb.h>
#include <netinet/in.h>

#include <string.h>

int main( int argc, char *argv[] ) {
   int sockfd, newsockfd, portno, clilen;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int  n;
   
   /* First call to socket() function */
   sockfd = socket(AF_INET, SOCK_STREAM, 0);
   
   if (sockfd < 0) {
      perror("ERROR opening socket");
      exit(1);
   }
   
   /* Initialize socket structure */
   bzero((char *) &serv_addr, sizeof(serv_addr));
   portno = 5000;
   
   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);
   
   /* Now bind the host address using bind() call.*/
   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
      perror("ERROR on binding");
      exit(1);
   }
      
   /* Now start listening for the clients, here process will
      * go in sleep mode and will wait for the incoming connection
   */
   
   listen(sockfd,5);
   clilen = sizeof(cli_addr);
   
   /* Accept actual connection from the client */
   newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
   
   if (newsockfd < 0) {
      perror("ERROR on accept");
      exit(1);
   }
   printf("Client Connected!\n");
   
   /* If connection is established then start communicating */
   while (1) {
     bzero(buffer,256);
     n = read( newsockfd,buffer,255 );
     
     if (n < 0) {
       perror("ERROR reading from socket");
       exit(1);
     }
   
     printf("client said : %s\n", buffer);
     
     /* Write a response to the client */
     n = write(newsockfd, buffer, strlen(buffer));
     
     if (n < 0) {
       perror("ERROR writing to socket");
       exit(1);
     }
     
     if (!bcmp(buffer, "quit", 4)) break;
   }
      
   return 0;
}

감사합니다!!