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Re: Re[4]: Working with curl connections as with sockets.

From: tetetest tetetest <tetetest_at_rambler.ru>
Date: Mon, 05 May 2008 16:43:00 +0400

* tetetest tetetest <tetetest_at_rambler.ru> [Mon, 05 May 2008 15:07:35
+0400]:

> Please find attached the patch (5 existing files modified), 2 man
pages
> (going to docs/libcurl), and one example of usage (going to
> docs/examples).

Oops... C++-style comments have slipped in in the sendrecv.c example...
Please disregard them (nothing useful in them, anyway).
I have attached the right version.

--
tetetest tetetest.

/*****************************************************************************
 * _ _ ____ _
 * Project ___| | | | _ \| |
 * / __| | | | |_) | |
 * | (__| |_| | _ <| |___
 * \___|\___/|_| \_\_____|
 *
 * An example of curl_easy_send() and curl_easy_recv() usage.
 *
 * $Id$
 */

#include <stdio.h>
#include <string.h>
#include <curl/curl.h>

/* Auxiliary function that waits on the socket. */
int wait_on_socket(int sockfd, int for_recv, long timeout_ms)
{
  struct timeval tv;
  long seconds, usecs;
  fd_set infd, outfd, errfd;
  int res;

  tv.tv_sec = timeout_ms / 1000;
  tv.tv_usec= (timeout_ms % 1000) * 1000;

  FD_ZERO(&infd);
  FD_ZERO(&outfd);
  FD_ZERO(&errfd);
  
  FD_SET(sockfd, &errfd); /* always check for error */

  if(for_recv)
  {
    FD_SET(sockfd, &infd);
  }
  else
  {
    FD_SET(sockfd, &outfd);
  }

  /* select() returns the number of signalled sockets or -1 */
  res = select(sockfd + 1, &infd, &outfd, &errfd, &tv);
  return res;
}

int main(void)
{
  CURL *curl;
  CURLcode res;
  /* Minimalistic http request */
  char *request = "GET / HTTP/1.0\r\nHost: curl.haxx.se\r\n\r\n";
  int sockfd; /* socket */
  size_t iolen;

  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "curl.haxx.se");
    /* Do not do the transfer - only connect to host */
    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
    res = curl_easy_perform(curl);
    
    if(CURLE_OK != res)
    {
      printf("Error: %s\n", strerror(res));
      return 1;
    }
    
    /* Extract the socket from the curl handle - we'll need it
     * for waiting */
    res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);
    
    if(CURLE_OK != res)
    {
      printf("Error: %s\n", strerror(res));
      return 1;
    }
    
    /* wait for the socket to become ready for sending */
    if(!wait_on_socket(sockfd, 0, 60000L))
    {
      printf("Error: timeout.\n");
      return 1;
    }
    
    puts("Sending request.");
    /* Send the request. Real applications should check the iolen
     * to see if all the request has been sent */
    res = curl_easy_send(curl, request, strlen(request), &iolen);

    if(CURLE_OK != res)
    {
      printf("Error: %s\n", strerror(res));
      return 1;
    }
    puts("Reading response.");
    
    /* read the response */
    for(;;)
    {
      char buf[1024];

      wait_on_socket(sockfd, 1, 60000L);
      res = curl_easy_recv(curl, buf, 1024, &iolen);

      if(CURLE_OK != res)
        break;

      printf("Received %u bytes.\n", iolen);
    }

    /* always cleanup */
    curl_easy_cleanup(curl);
  }
  return 0;
}
Received on 2008-05-05

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