how can I read socket by blocking&none-multiplexing&sync mode? - c

Question

I want to repeatedly request one specific url by maximum performance. I copied below source from github, but I think it isn't optimized for my case, so I have to tune it.
Which Option is best in my case?
block vs non-block
sync vs async
I think non-multiplexing is right, so I've to change select() function to the other one. Is this right?
char response[RESPONSE_SIZE + 1];
char *p = response, *q;
char *end = response + RESPONSE_SIZE;
char *body = 0;
enum {
length, chunked, connection
};
int encoding = 0;
int remaining = 0;
while (1) {
fd_set reads;
FD_ZERO(&reads);
FD_SET(server, &reads);
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 200;
if (FD_ISSET(server, &reads)) {
int bytes_received = SSL_read(ssl, p, end - p);
p += bytes_received;
*p = 0;
if (!body && (body = strstr(response, "\r\n\r\n"))) {
*body = 0;
body += 4;
printf("Received Headers:\n%s\n", response);
q = strstr(response, "\nContent-Length: ");
if (q) {
encoding = length;
q = strchr(q, ' ');
q += 1;
remaining = strtol(q, 0, 10);
} else {
q = strstr(response, "\nTransfer-Encoding: chunked");
if (q) {
encoding = chunked;
remaining = 0;
} else {
encoding = connection;
}
}
printf("\nReceived Body:\n");
}
if (body) {
if (encoding == length) {
if (p - body >= remaining) {
printf("%.*s", remaining, body);
break;
}
} else if (encoding == chunked) {
do {
if (remaining == 0) {
if ((q = strstr(body, "\r\n"))) {
remaining = strtol(body, 0, 16);
if (!remaining) goto finish;
body = q + 2;
} else {
break;
}
}
if (p - body >= remaining) {
printf("%.*s", remaining, body);
body += remaining + 2;
remaining = 0;
}
} while (!remaining);
}
} //if (body)
} //if FDSET
} //end while(1)
finish:
buffer[0] = '\0';
printf("\nClosing socket...\n");