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📄 10-at-a-time.c(4.24 KB)
📄 Makefile.example(1.86 KB)
📄 README.md(1.35 KB)
📄 altsvc.c(1.83 KB)
📄 anyauthput.c(4.82 KB)
📄 cacertinmem.c(7.14 KB)
📄 certinfo.c(2.25 KB)
📄 chkspeed.c(6.54 KB)
📄 cookie_interface.c(4.03 KB)
📄 crawler.c(6.53 KB)
📄 curlgtk.c(2.94 KB)
📄 curlx.c(16.41 KB)
📄 debug.c(4.21 KB)
📄 ephiperfifo.c(14.49 KB)
📄 evhiperfifo.c(11.9 KB)
📄 externalsocket.c(4.83 KB)
📄 fileupload.c(2.78 KB)
📄 fopen.c(13.87 KB)
📄 ftp-wildcard.c(4.15 KB)
📄 ftpget.c(2.59 KB)
📄 ftpgetinfo.c(2.86 KB)
📄 ftpgetresp.c(2.51 KB)
📄 ftpsget.c(2.89 KB)
📄 ftpupload.c(4.48 KB)
📄 ftpuploadfrommem.c(3.81 KB)
📄 ftpuploadresume.c(4.24 KB)
📄 getinfo.c(1.62 KB)
📄 getinmemory.c(3.24 KB)
📄 getredirect.c(2.3 KB)
📄 getreferrer.c(1.81 KB)
📄 ghiper.c(12.04 KB)
📄 hiperfifo.c(11.97 KB)
📄 href_extractor.c(2.61 KB)
📄 htmltidy.c(3.88 KB)
📄 htmltitle.cpp(6.23 KB)
📄 http-post.c(1.99 KB)
📄 http2-download.c(6.19 KB)
📄 http2-pushinmemory.c(5.02 KB)
📄 http2-serverpush.c(7.1 KB)
📄 http2-upload.c(8.05 KB)
📄 http3-present.c(1.53 KB)
📄 http3.c(1.81 KB)
📄 httpcustomheader.c(2.27 KB)
📄 httpput-postfields.c(3.36 KB)
📄 httpput.c(3.6 KB)
📄 https.c(2.53 KB)
📄 imap-append.c(3.77 KB)
📄 imap-authzid.c(2.21 KB)
📄 imap-copy.c(2.35 KB)
📄 imap-create.c(2.06 KB)
📄 imap-delete.c(2.06 KB)
📄 imap-examine.c(2.11 KB)
📄 imap-fetch.c(1.95 KB)
📄 imap-list.c(2.08 KB)
📄 imap-lsub.c(2.08 KB)
📄 imap-multi.c(2.29 KB)
📄 imap-noop.c(2 KB)
📄 imap-search.c(2.35 KB)
📄 imap-ssl.c(3.25 KB)
📄 imap-store.c(2.69 KB)
📄 imap-tls.c(3.5 KB)
📄 makefile.dj(1.58 KB)
📄 multi-app.c(3.36 KB)
📄 multi-debugcallback.c(4.21 KB)
📄 multi-double.c(2.62 KB)
📄 multi-event.c(6.01 KB)
📄 multi-formadd.c(3.23 KB)
📄 multi-legacy.c(5.13 KB)
📄 multi-post.c(3.04 KB)
📄 multi-single.c(2.49 KB)
📄 multi-uv.c(5.97 KB)
📄 multithread.c(2.59 KB)
📄 opensslthreadlock.c(2.69 KB)
📄 parseurl.c(2.13 KB)
📄 persistent.c(2.15 KB)
📄 pop3-authzid.c(2.18 KB)
📄 pop3-dele.c(2.15 KB)
📄 pop3-list.c(1.93 KB)
📄 pop3-multi.c(2.29 KB)
📄 pop3-noop.c(2.11 KB)
📄 pop3-retr.c(1.93 KB)
📄 pop3-ssl.c(3.22 KB)
📄 pop3-stat.c(2.13 KB)
📄 pop3-tls.c(3.47 KB)
📄 pop3-top.c(2.09 KB)
📄 pop3-uidl.c(2.03 KB)
📄 post-callback.c(5.15 KB)
📄 postinmemory.c(3.36 KB)
📄 postit2-formadd.c(3.51 KB)
📄 postit2.c(3.41 KB)
📄 progressfunc.c(4.8 KB)
📄 resolve.c(1.92 KB)
📄 rtsp.c(9.02 KB)
📄 sampleconv.c(3.25 KB)
📄 sendrecv.c(4.52 KB)
📄 sepheaders.c(2.67 KB)
📄 sessioninfo.c(3.06 KB)
📄 sftpget.c(3.25 KB)
📄 sftpuploadresume.c(3.82 KB)
📄 shared-connection-cache.c(2.51 KB)
📄 simple.c(1.68 KB)
📄 simplepost.c(1.83 KB)
📄 simplessl.c(4.56 KB)
📄 smooth-gtk-thread.c(6.01 KB)
📄 smtp-authzid.c(5.33 KB)
📄 smtp-expn.c(2.55 KB)
📄 smtp-mail.c(4.86 KB)
📄 smtp-mime.c(5.47 KB)
📄 smtp-multi.c(4.54 KB)
📄 smtp-ssl.c(5.75 KB)
📄 smtp-tls.c(6.21 KB)
📄 smtp-vrfy.c(2.62 KB)
📄 sslbackend.c(2.29 KB)
📄 synctime.c(12.6 KB)
📄 threaded-ssl.c(4.34 KB)
📄 url2file.c(2.43 KB)
📄 urlapi.c(1.98 KB)
📄 usercertinmem.c(8.87 KB)
📄 xmlstream.c(4.94 KB)

Editing: multi-event.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * 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.
 *
 * 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_socket API using libevent
 * </DESC>
 */

#include <stdio.h>
#include <stdlib.h>
#include <event2/event.h>
#include <curl/curl.h>

struct event_base *base;
CURLM *curl_handle;
struct event *timeout;

typedef struct curl_context_s {
  struct event *event;
  curl_socket_t sockfd;
} curl_context_t;

static void curl_perform(int fd, short event, void *arg);

static curl_context_t *create_curl_context(curl_socket_t sockfd)
{
  curl_context_t *context;

context = (curl_context_t *) malloc(sizeof(*context));

context->sockfd = sockfd;

context->event = event_new(base, sockfd, 0, curl_perform, context);

return context;
}

static void destroy_curl_context(curl_context_t *context)
{
  event_del(context->event);
  event_free(context->event);
  free(context);
}

static void add_download(const char *url, int num)
{
  char filename[50];
  FILE *file;
  CURL *handle;

snprintf(filename, 50, "%d.download", num);

file = fopen(filename, "wb");
  if(!file) {
    fprintf(stderr, "Error opening %s\n", filename);
    return;
  }

handle = curl_easy_init();
  curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
  curl_easy_setopt(handle, CURLOPT_PRIVATE, file);
  curl_easy_setopt(handle, CURLOPT_URL, url);
  curl_multi_add_handle(curl_handle, handle);
  fprintf(stderr, "Added download %s -> %s\n", url, filename);
}

static void check_multi_info(void)
{
  char *done_url;
  CURLMsg *message;
  int pending;
  CURL *easy_handle;
  FILE *file;

while((message = curl_multi_info_read(curl_handle, &pending))) {
    switch(message->msg) {
    case CURLMSG_DONE:
      /* Do not use message data after calling curl_multi_remove_handle() and
         curl_easy_cleanup(). As per curl_multi_info_read() docs:
         "WARNING: The data the returned pointer points to will not survive
         calling curl_multi_cleanup, curl_multi_remove_handle or
         curl_easy_cleanup." */
      easy_handle = message->easy_handle;

curl_easy_getinfo(easy_handle, CURLINFO_EFFECTIVE_URL, &done_url);
      curl_easy_getinfo(easy_handle, CURLINFO_PRIVATE, &file);
      printf("%s DONE\n", done_url);

curl_multi_remove_handle(curl_handle, easy_handle);
      curl_easy_cleanup(easy_handle);
      if(file) {
        fclose(file);
      }
      break;

default:
      fprintf(stderr, "CURLMSG default\n");
      break;
    }
  }
}

static void curl_perform(int fd, short event, void *arg)
{
  int running_handles;
  int flags = 0;
  curl_context_t *context;

if(event & EV_READ)
    flags |= CURL_CSELECT_IN;
  if(event & EV_WRITE)
    flags |= CURL_CSELECT_OUT;

context = (curl_context_t *) arg;

curl_multi_socket_action(curl_handle, context->sockfd, flags,
                           &running_handles);

check_multi_info();
}

static void on_timeout(evutil_socket_t fd, short events, void *arg)
{
  int running_handles;
  curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
                           &running_handles);
  check_multi_info();
}

static int start_timeout(CURLM *multi, long timeout_ms, void *userp)
{
  if(timeout_ms < 0) {
    evtimer_del(timeout);
  }
  else {
    if(timeout_ms == 0)
      timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it
                         in a bit */
    struct timeval tv;
    tv.tv_sec = timeout_ms / 1000;
    tv.tv_usec = (timeout_ms % 1000) * 1000;
    evtimer_del(timeout);
    evtimer_add(timeout, &tv);
  }
  return 0;
}

static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
                  void *socketp)
{
  curl_context_t *curl_context;
  int events = 0;

switch(action) {
  case CURL_POLL_IN:
  case CURL_POLL_OUT:
  case CURL_POLL_INOUT:
    curl_context = socketp ?
      (curl_context_t *) socketp : create_curl_context(s);

curl_multi_assign(curl_handle, s, (void *) curl_context);

if(action != CURL_POLL_IN)
      events |= EV_WRITE;
    if(action != CURL_POLL_OUT)
      events |= EV_READ;

events |= EV_PERSIST;

event_del(curl_context->event);
    event_assign(curl_context->event, base, curl_context->sockfd, events,
      curl_perform, curl_context);
    event_add(curl_context->event, NULL);

break;
  case CURL_POLL_REMOVE:
    if(socketp) {
      event_del(((curl_context_t*) socketp)->event);
      destroy_curl_context((curl_context_t*) socketp);
      curl_multi_assign(curl_handle, s, NULL);
    }
    break;
  default:
    abort();
  }

return 0;
}

int main(int argc, char **argv)
{
  if(argc <= 1)
    return 0;

if(curl_global_init(CURL_GLOBAL_ALL)) {
    fprintf(stderr, "Could not init curl\n");
    return 1;
  }

base = event_base_new();
  timeout = evtimer_new(base, on_timeout, NULL);

curl_handle = curl_multi_init();
  curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
  curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);

while(argc-- > 1) {
    add_download(argv[argc], argc);
  }

event_base_dispatch(base);

curl_multi_cleanup(curl_handle);
  event_free(timeout);
  event_base_free(base);

libevent_global_shutdown();
  curl_global_cleanup();

return 0;
}

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Editing: multi-event.c

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