sockets,getting empty response from external domain - c

Question

I have this code, simple socket C example code, it works fine for an simple servidor that I wrote and run on local computer,but if I try for example, get html from google web page, it delay significantly the time of reply and returns empty buffer.
my code:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
void bye(char * mmo);
void bye(char * mm) {
printf("%s\n", mm);
exit(0);
}
int main(void) {
int tcpSocket, port;
char buffer[256],err[256], *servername,* mm;
struct hostent *server;
struct sockaddr_in serverAddr;
servername = "google.com";
tcpSocket = socket(AF_INET, SOCK_STREAM, 0);
port = 80;
server = gethostbyname(servername);
mm = "baa";
if(tcpSocket < 0) {
sprintf(err, "Can't to initialize TCP socket communication(%s).", strerror(errno));
bye(err);
}
if(NULL == server) {
bye("Server not found");
}
memset(&serverAddr, 0, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
memcpy(&serverAddr.sin_addr.s_addr,
server->h_addr,
server->h_length);
serverAddr.sin_port = htons(port);
if(connect(tcpSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) {
sprintf(err, "failed internet connection. %s", strerror(errno));
bye(err);
}
if(write(tcpSocket, mm, strlen(mm)) < 0) {
sprintf(err, "Can't send.(%s)\n", strerror(errno));
bye(err);
}
memset(buffer, 0, sizeof(buffer));
while(read(tcpSocket, buffer, 255) < 0) {
printf("%s", buffer);
}
close(tcpSocket);
printf("done!\n");
return 0;
}
Thanks in advance.:)

Answer 1

Referring the code that reads the result:
while(read(tcpSocket, buffer, 255) < 0) {
printf("%s", buffer);
}
Such code only prints out the buffer´s content in case read() returned a vlaue less then 0, which read does in case of an error.
You might like to modify your code like so:
{
size_t sizeReadTotal = 0;
size_t sizeToRead = 255;
ssize_t ssizeRead = 0;
while (sizeToRead && (ssizeRead = read(tcpSocket, buffer + sizeReadTotal, sizeToRead))) {
if (0 > sizeRead) {
if (EAGAIN == errno || EWOULDBLOCK == errno)
continue;
else
break;
}
sizeToRead -= ssizeRead;
sizeReadTotal += ssizeRead;
}
if (0 > ssizeRead)
printf("read() failed after having read %dbytes: %s\n", sizeReadTotal, strerror(errno));
printf("Data read: '%s'\n", buffer);
}
Further more you should also send the '\n' to the server also (as selbie mentioned), so change:
mm = "baa";
into
mm = "baa\n";