🚀 go-pugleaf

I'm have a problem with Sockets.  The following code reads the first email
message from a POP3 server.  The problem is I have to use a wait for it to
work.  I don't consider using a wait as being a acceptable way to write
programs.  It seems that this code is using non-blocking sockets but I'm not
sure.  Is this code using non-blocking sockets?  And if so how can I change
it to use blocking sockets.


#include <stdio.h>
#include <winsock2.h>

int main(int argc, char* argv[])
{
   char user[] = "someone";
   char pass[] = "password";
   char server[] = "mail.domain.com";
   int portNo = 110;
   int ret;
   WSADATA      WSData;
   LPHOSTENT    lpHostEntry;
   SOCKADDR_IN  SockAddr;
   SOCKET       hServer;
   char         szBuffer[4096], szMsgLine[255];

   const    VERSION_MAJOR  = 1;
   const    VERSION_MINOR  = 1;

   WSAStartup(MAKEWORD(VERSION_MAJOR, VERSION_MINOR), &WSData);
   lpHostEntry = gethostbyname(server);
   hServer = socket(PF_INET, SOCK_STREAM, 0);

   SockAddr.sin_family = AF_INET;
   SockAddr.sin_port = htons(portNo);
   SockAddr.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);

   connect( hServer, (PSOCKADDR) &SockAddr, sizeof(SockAddr));

   recv( hServer, szBuffer, sizeof(szBuffer), 0);

   wsprintf(szMsgLine, "USER %s\r\n",user);
   send( hServer, szMsgLine, strlen(szMsgLine), 0);
   recv( hServer, szBuffer, sizeof(szBuffer), 0);

   wsprintf(szMsgLine, "PASS %s\r\n",pass);
   send( hServer, szMsgLine, strlen(szMsgLine), 0);
   recv( hServer, szBuffer, sizeof(szBuffer), 0);

   strcpy(szMsgLine, "RETR 1\r\n");
   send( hServer, szMsgLine, strlen(szMsgLine), 0);
   Sleep(300);  // waiting
   ret = recv( hServer, szBuffer, sizeof(szBuffer), 0);
   szBuffer[ret-2]='\0';

   printf(szBuffer);

   lstrcpy(szMsgLine, "QUIT\r\n");
   send( hServer, szMsgLine, strlen(szMsgLine), 0);
   ret = recv( hServer, szBuffer, sizeof(szBuffer), 0);
   szBuffer[ret-2]='\0';

   closesocket( hServer );
   WSACleanup();

   return 0;
}
//--------------------------------------------------------------------------
-