curl/docs/examples/pop3-noop.c

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 * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
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 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
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 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
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/* <DESC>
 * POP3 example showing how to perform a noop
 * </DESC>
 */

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

/* This is a simple example showing how to perform a noop using libcurl's POP3
 * capabilities.
 *
 * Note that this example requires libcurl 7.26.0 or above.
 */

int main(void)
{
  CURL *curl;
  CURLcode res = CURLE_OK;

  curl = curl_easy_init();
  if(curl) {
    /* Set username and password */
    curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
    curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");

    /* This is just the server URL */
    curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com");

    /* Set the NOOP command */
    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "NOOP");

    /* Do not perform a transfer as NOOP returns no data */
    curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);

    /* Perform the custom request */
    res = curl_easy_perform(curl);

    /* Check for errors */
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

    /* Always cleanup */
    curl_easy_cleanup(curl);
  }

  return (int)res;
}