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Edit File: multi-debugcallback.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2017, 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.haxx.se/docs/copyright.html.
 *
 * 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.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
/* <DESC>
 * multi interface and debug callback
 * </DESC>
 */

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

/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>

/* curl stuff */
#include <curl/curl.h>

typedef char bool;
#define TRUE 1

static
void dump(const char *text,
          FILE *stream, unsigned char *ptr, size_t size,
          bool nohex)
{
  size_t i;
  size_t c;

unsigned int width = 0x10;

if(nohex)
    /* without the hex output, we can fit more on screen */
    width = 0x40;

fprintf(stream, "%s, %10.10lu bytes (0x%8.8lx)\n",
          text, (unsigned long)size, (unsigned long)size);

for(i = 0; i<size; i += width) {

fprintf(stream, "%4.4lx: ", (unsigned long)i);

if(!nohex) {
      /* hex not disabled, show it */
      for(c = 0; c < width; c++)
        if(i + c < size)
          fprintf(stream, "%02x ", ptr[i + c]);
        else
          fputs("   ", stream);
    }

for(c = 0; (c < width) && (i + c < size); c++) {
      /* check for 0D0A; if found, skip past and start a new line of output */
      if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
         ptr[i + c + 1] == 0x0A) {
        i += (c + 2 - width);
        break;
      }
      fprintf(stream, "%c",
              (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
      /* check again for 0D0A, to avoid an extra \n if it's at width */
      if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
         ptr[i + c + 2] == 0x0A) {
        i += (c + 3 - width);
        break;
      }
    }
    fputc('\n', stream); /* newline */
  }
  fflush(stream);
}

static
int my_trace(CURL *handle, curl_infotype type,
             unsigned char *data, size_t size,
             void *userp)
{
  const char *text;

(void)userp;
  (void)handle; /* prevent compiler warning */

switch(type) {
  case CURLINFO_TEXT:
    fprintf(stderr, "== Info: %s", data);
    /* FALLTHROUGH */
  default: /* in case a new one is introduced to shock us */
    return 0;

case CURLINFO_HEADER_OUT:
    text = "=> Send header";
    break;
  case CURLINFO_DATA_OUT:
    text = "=> Send data";
    break;
  case CURLINFO_HEADER_IN:
    text = "<= Recv header";
    break;
  case CURLINFO_DATA_IN:
    text = "<= Recv data";
    break;
  }

dump(text, stderr, data, size, TRUE);
  return 0;
}

/*
 * Simply download a HTTP file.
 */
int main(void)
{
  CURL *http_handle;
  CURLM *multi_handle;

int still_running; /* keep number of running handles */

http_handle = curl_easy_init();

/* set the options (I left out a few, you'll get the point anyway) */
  curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/");

curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
  curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);

/* init a multi stack */
  multi_handle = curl_multi_init();

/* add the individual transfers */
  curl_multi_add_handle(multi_handle, http_handle);

/* we start some action by calling perform right away */
  curl_multi_perform(multi_handle, &still_running);

do {
    struct timeval timeout;
    int rc; /* select() return code */
    CURLMcode mc; /* curl_multi_fdset() return code */

fd_set fdread;
    fd_set fdwrite;
    fd_set fdexcep;
    int maxfd = -1;

long curl_timeo = -1;

FD_ZERO(&fdread);
    FD_ZERO(&fdwrite);
    FD_ZERO(&fdexcep);

/* set a suitable timeout to play around with */
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;

curl_multi_timeout(multi_handle, &curl_timeo);
    if(curl_timeo >= 0) {
      timeout.tv_sec = curl_timeo / 1000;
      if(timeout.tv_sec > 1)
        timeout.tv_sec = 1;
      else
        timeout.tv_usec = (curl_timeo % 1000) * 1000;
    }

/* get file descriptors from the transfers */
    mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);

if(mc != CURLM_OK) {
      fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
      break;
    }

/* On success the value of maxfd is guaranteed to be >= -1. We call
       select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
       no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
       to sleep 100ms, which is the minimum suggested value in the
       curl_multi_fdset() doc. */

if(maxfd == -1) {
#ifdef _WIN32
      Sleep(100);
      rc = 0;
#else
      /* Portable sleep for platforms other than Windows. */
      struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
      rc = select(0, NULL, NULL, NULL, &wait);
#endif
    }
    else {
      /* Note that on some platforms 'timeout' may be modified by select().
         If you need access to the original value save a copy beforehand. */
      rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
    }

switch(rc) {
    case -1:
      /* select error */
      still_running = 0;
      printf("select() returns error, this is badness\n");
      break;
    case 0:
    default:
      /* timeout or readable/writable sockets */
      curl_multi_perform(multi_handle, &still_running);
      break;
    }
  } while(still_running);

curl_multi_cleanup(multi_handle);

curl_easy_cleanup(http_handle);

return 0;
}