729
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT             5555
#define MESSAGE         "Yow!!! Are we having fun yet?!?"
#define SERVERHOST      "localhost"


void write_to_server (int filedes)
{
    int nbytes;

    nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
    if (nbytes < 0) {
	perror ("write");
	exit (EXIT_FAILURE);
    }
}


int main (void)
{
    struct timeval tv;
    fd_set fds;
    int sock, oldstate, curstate, r, err;
    int optlen = sizeof(int);
    struct sockaddr_in servername;

    /* Create the socket. */
    sock = socket (PF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
	perror ("socket (client)");
	exit (EXIT_FAILURE);
    }

    oldstate = fcntl(sock, F_GETFL);
    curstate = oldstate | O_NONBLOCK;
    r = fcntl(sock, F_SETFL, curstate);
    if (r < 0) {
	perror("fcntl");
	exit(1);
    }

    /* Connect to the server. */
    init_sockaddr (&servername, SERVERHOST, PORT);
    if (0 > connect (sock, (struct sockaddr *) &servername,
	sizeof (servername))) {
	perror ("connect (client)");
    }

    FD_ZERO(&fds);
    FD_SET(sock, &fds);
    tv.tv_sec = 5;
    tv.tv_usec = 0;

    r = select(sock + 1, NULL, &fds, NULL, &tv);
    while (1) {
	if (FD_ISSET(sock, &fds)) {
	    getsockopt(sock, SOL_SOCKET, SO_ERROR, (char*)&err, &optlen);
	    if (err != 0) {
		perror("getsockopt");
	    }
	    break;
	}
	if (r <= 0) {
	    if (r < 0)
		perror("select");
	    else {
		printf("Timeout %d\n", r);
	    }
	}
    }

    /* Send data to the server. */
    write_to_server (sock);
    close (sock);
    exit (EXIT_SUCCESS);
}

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