Subsequent Messages not Received - c

Question

I'm working on a networking project. I can successfully send a single message from my client program over to my server program. However, when I send a second message, the server apparently isn't receiving it. I say this because the client program generates output to suggest that the message was sent, but the server shows no reaction at all.
I'm thinking that I am doing something wrong with either select() or FD_ISSET(). Can anyone see what I am doing wrong? Thanks.
int main(int argc, char *argv[]) {
int sockfd, newfd;
struct sockaddr_in clientAddr;
unsigned int recvLen;
socklen_t addr_size = sizeof clientAddr;
fd_set read_set;
struct timeval tv;
char buffer[BUFFSIZE];
// prepare the address struct for the first client
bzero(&clientAddr,sizeof(clientAddr)); //zero the struct
clientAddr.sin_family = AF_INET; //address family (ipv4)
clientAddr.sin_port = htons(SERVER_PORT); //sets port to network byte order
clientAddr.sin_addr.s_addr = INADDR_ANY;
// create a listening connection to listen for requests from clients
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
fprintf(stdout, "Cannot create socket for client 0.\n");
fprintf(stdout, "Terminating program\n\n");
exit(1);
}
if (bind(sockfd, (struct sockaddr *)&clientAddr, sizeof(clientAddr)) < 0) {
fprintf (stdout, "Binding failed for client 0\n\n");
perror("bind failed");
exit (1);
}
if (listen(sockfd, 10) < 0) {
fprintf (stdout, "Listen() failed\n");
perror("listen() failed");
exit (1);
}
// accept the connection
if ((newfd = accept(sockfd, (struct sockaddr *)&clientAddr, &addr_size)) < 0) {
fprintf(stdout, "Error accepting inbound data from client 0\n");
perror(" accept() failed");
exit(EXIT_FAILURE);
}
// initialize the fd set
FD_ZERO(&read_set);
FD_SET(newfd, &read_set); // adding our socket to the set
tv.tv_sec = 0;
tv.tv_usec = TIMEOUT * 1000;
while (1) {
if ( select(newfd+1, &read_set, NULL, NULL, &tv) == -1) {
perror("select failure");
fprintf(stdout, "errno: %d\n", errno);
exit(EXIT_FAILURE);
}
if (FD_ISSET(newfd, &read_set)) {
bzero(buffer, BUFFSIZE);
recv(newfd, &buffer, BUFFSIZE, 0);
fprintf(stdout, "Received message: %s\n", buffer);
}
}
return 0;
}

Answer 1

After each select you need call FD_ZERO(&read_set); FD_SET(newfd, &read_set); again.
So just move those functions into the loop, before select.