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server.c
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server.c
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/* A simple server in the internet domain using TCP
The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int n;
char buffer[255];
socklen_t clilen;
int sockfd, newSockfd, portNo;
struct sockaddr_in serv_addr, cli_addr;
if (argc < 2) {
fprintf(stderr, "ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portNo = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portNo);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd, 5);
clilen = sizeof(cli_addr);
newSockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newSockfd < 0)
error("ERROR on accept");
while (1) {
bzero(buffer, 256);
n = read(newSockfd, buffer, 255);
if (n < 0)
error("ERROR reading from socket");
printf("Client : %s\n", buffer);
bzero(buffer, 256);
fgets(buffer, 255, stdin);
n = write(newSockfd, buffer, strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
int i = strncmp("Bye", buffer, 3);
if (i == 0)
break;
}
close(sockfd);
close(newSockfd);
return 0;
}