TCP Client problem while trying to multiplex stdin and scoket
Hello;
I am writing this TCPClient which will multiplex between the stdin and socket to get mesages from the server. The server is implemented to deal with multiple clients. But I have written the following code. But when I run the code, it is only going in the infinite loop and not even printing the statements which I have mentioned below. And obviously, it is not working as I want to work (send messages and receive messages at the same time)
Code:
/* tcpclient.c */
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
int main()
{
int sock, bytes_recieved;
char send_data[1024],recv_data[1024];
struct hostent *host;
struct sockaddr_in server_addr;
fd_set read_fds;
char ch;
int count = 0;
int i;
host = gethostbyname("127.0.0.1");
//create the socket
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("Socket");
exit(1);
}
//set server info
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(5000);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(server_addr.sin_zero),8);
//connect to the server
if (connect(sock, (struct sockaddr *)&server_addr,
sizeof(struct sockaddr)) == -1)
{
perror("Connect");
exit(1);
}
printf("stage 1"); //the program is not even printing this but it is going to the infinite loop below!!!!
while(1)
{
//initialize the readset and add stdin and the socket to it
FD_ZERO(&read_fds);
FD_SET(0, &read_fds);
FD_SET(sock, &read_fds);
printf("Send something: %s",send_data); //this is also is not getting printed
if(select(sock+1, &read_fds, NULL, NULL, NULL) == -1)
{
perror("Server-select() error lol!");
exit(1);
}
if(FD_ISSET(0, &read_fds)) //something has happened in the stdin
{
printf("key pressed"); //when I press a key, it should get here, but its not printing this also!!
ch = getc(0);
if (ch=='\n') //user typed enter, time to send the content of the buffer and clear it
{
send(sock, send_data, sizeof(send_data), 0);
send_data[0]='\0';
count = 0;
}
else //append the pressed character to the buffer
{
printf("here"); //it is also not printed!!!
send_data[count]=ch;
count++;
}
}
else if(FD_ISSET(sock, &read_fds)) //server has sent something
{
bytes_recieved = recv(i, recv_data, sizeof(recv_data), 0);
printf("%s",recv_data);
recv_data[0]='\0';
}
}//end of infinite while
return 0;
}
I see in the following thread that there has been a discussion on this. But I am still having problem
http://cboard.cprogramming.com/netwo...ket-stdin.html
Thanks for your help;
Arnamoy
