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- /***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 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.
- *
- * SPDX-License-Identifier: curl
- *
- ***************************************************************************/
- /* <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 does 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 call socket_action asap */
- 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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