receive in tcp client c++

[isan]

in my client side in receive function if (buffer[i] == work[i] ) write 1 in pin until (c < 13)
and when program in while,if socket receive stop to write 0 in pin,it doesn't work until while ends ,I want to socket any time receive stop it's write 0 in pin ,how can handle this?
Client:

bool client::conn(int num_pin_1, int num_pin_2) {
	struct sockaddr_in serv_addr;
	struct hostent *server;

	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0)
		printf("ERROR opening socket");
	else {
		fflush(stdout);
	}

	server = gethostbyname("192.168.1.129");
	if (server == 0) {
		fprintf(stderr, "ERROR, no such host\n");
		exit(0);
	} else {
		printf("connected");
		fflush(stdout);
	}
	bzero((char *) &serv_addr, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	bcopy((char *) server->h_addr,
	(char *)&serv_addr.sin_addr.s_addr,
	server->h_length);
	serv_addr.sin_port = htons(MYPORT);
	while (connect(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
		perror("ERROR connecting");
	}

}

bool client::rec_data(int num_pin_1, int num_pin_2) {

rc=recv(sock, buffer, sizeof(buffer), 0);
	if ( rc < 0) {
		perror("receive failed");
		return false;
	}

for (int i = 0; i < 2; i++) {
    if (buffer[i] == work[i] ) {	
	while (c < 13) {	
            digitalWrite(pin2, HIGH);
            digitalWrite(pin1, LOW);
	}
   }

    if (buffer[i] == Stop[i]) {
        digitalWrite(pin2,  LOW);
        digitalWrite(pin1, LOW);
    }
}

[2kaud]

       while (c < 13) {	
            digitalWrite(pin2, HIGH);
            digitalWrite(pin1, LOW);
	}

How does c get initialised and changed?

[isan]

c is:

d= clock();
c=double(clock() - d) / CLOCKS_PER_SEC;

[2kaud]

But in the loop, either the loop is not executed at all (c >= 13) or if c < 13 then the loop is infinite as c isn't changed in the loop