Socket error on non-blocking

Hi;

I have a client/server but i keep getting an error when i run the program. When the socket is blocking it works but non blocking it doesnt.

Here is the server code

Code:

#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <fcntl.h>

#define BUFFSIZE 256
void Die(char *mess) { perror(mess); exit(1); }
int main(int argc, char *argv[])
{

        int serversock, clientsock;
        struct sockaddr_in echoserver, echoclient;
        char buffer[BUFFSIZE];
        int val;

        if (argc != 3) {
           fprintf(stderr, "USAGE: echoserver <ipaddress>  <port>\n");
           exit(1);
        }

        /* Create the TCP socket */
        if ((serversock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
            Die("Failed to create socket");
        }

        /*Unblock the socket*/
        fcntl(serversock, F_SETFL, O_NONBLOCK);

        /* Construct the server sockaddr_in structure */
        memset(&echoserver, 0, sizeof(echoserver));       /* Clear struct */
        echoserver.sin_family = AF_INET;                  /* Internet/IP */
        echoserver.sin_addr.s_addr = inet_addr(argv[1]);  /* Incoming addr */
        echoserver.sin_port = htons(atoi(argv[2]));       /* server port */

        /* Bind the server socket */
        if (bind(serversock, (struct sockaddr *) &echoserver,
            sizeof(echoserver)) < 0) {
            Die("Failed to bind the server socket");
        }

        /* Listen on the server socket */
        if (listen(serversock, 5) < 0) {
           Die("Failed to listen on server socket");
         }

        /* Run until cancelled */
        while (1) {
              unsigned int clientlen = sizeof(echoclient);
              /* Wait for client connection */
              if ((clientsock =
                   accept(serversock, (struct sockaddr *) &echoclient,
                          &clientlen)) < 0) {
                Die("Failed to accept client connection");
              }
              fprintf(stdout, "Client connected: %s\n",
                inet_ntoa(echoclient.sin_addr));

    }
}

Client code is

Code:

#include <stdio.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <signal.h>
#include <sys/time.h>
#include <fcntl.h>
#include <sys/types.h>

#define BUFFSIZE 265
void Die(char *mess) { perror(mess); exit(1); }

int main(int argc, char *argv[])
{
        int sock;
        struct sockaddr_in echoserver;
        unsigned int echolen;
        if (argc != 3) {
                fprintf(stderr, "USAGE: TCPecho <ip address>  <port>\n");
                exit(1);
        }
/* Create the TCP socket */
        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
                Die("Failed to create socket");
        }

        fcntl(sock, F_SETFL, O_NONBLOCK);

        /*Construct the server sockaddr_in structure */
        memset(&echoserver, 0, sizeof(echoserver));       /* Clear struct */
        echoserver.sin_family = AF_INET;                  /* Internet/IP */
        echoserver.sin_addr.s_addr = inet_addr(argv[1]);  /* IP address */
        echoserver.sin_port = htons(atoi(argv[2]));       /* server port */

        
        /* Establish connection */
        if (connect(sock,
           (struct sockaddr *) &echoserver,
            sizeof(echoserver)) < 0) {
                Die("Failed to connect with server");
        }
}

Client error on command prompt is Failed to connect with server: Operation now in progress

Server error is :
Failed to accept client connection: Resource temporarily unavailable!!


Any ideas?



Thanks

Originally Posted by newbie30

Hi;

I have a client/server but i keep getting an error when i run the program. When the socket is blocking it works but non blocking it doesnt.

I don't know if this is why, but I would set the non-block after the socket is set-up; that is, for the server, after bind() but before listen(); for the client, there is no point in using non-block until after you connect().