i am working on c++ server client example using sockets....
whenever i tried to run server 2nd time on the same port it fails !! ok... i know that port is not free and still opened for my previous program but i have used SO_REUSEADDR but still it's not working for 2nd time...
Any one can help me ???
i want to know why SO_REUSEADDR is not working ???
or if its working how could i know it had worked ??
Thanks.
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <iostream>
using namespace std;
#define SERV_TCP_PORT 8001 /* server's port number */
#define MAX_SIZE 80
int main()
{
int sockfd, newsockfd, clilen;
struct sockaddr_in cli_addr, serv_addr;
int port;
char string[MAX_SIZE];
port = SERV_TCP_PORT;
/* open a TCP socket (an Internet stream socket) */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("can't open stream socket");
exit(1);
}
// int socket_desc; /* master socket returned by socket() */
int opt=1; /* option is to be on/TRUE or off/FALSE */
int b;
b = setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt));
cout << "B: "<< b << endl;
/* bind the local address, so that the cliend can send to server */
memset((char *) &serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(port);
if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
perror("can't bind local address-aaaa");
exit(1);
}
/* listen to the socket */
listen(sockfd, 5);
for(;;) {
/* wait for a connection from a client; this is an iterative server */
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if(newsockfd < 0) {
perror("can't bind local address");
}
/* read a message from the client */
read(newsockfd, string, MAX_SIZE);
printf("%s\n", string);
close(newsockfd);
}
return 0;
}