Created
June 12, 2019 23:35
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sample program for libcurl assertion / busy loop
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#include <string.h> | |
#include <curl/curl.h> | |
fd_set wfds; | |
fd_set rfds; | |
struct timeval tv; | |
int maxfd = 0; | |
int socket_callback(CURL *easy, /* easy handle */ | |
curl_socket_t s, /* socket */ | |
int what, /* describes the socket */ | |
void *userp, /* private callback pointer */ | |
void *socketp) /* private socket pointer */ | |
{ | |
FD_CLR(s, &wfds); | |
FD_CLR(s, &rfds); | |
if (what == CURL_POLL_IN || what == CURL_POLL_INOUT) { | |
FD_SET(s, &rfds); | |
} | |
if (what == CURL_POLL_OUT || what == CURL_POLL_INOUT) { | |
FD_SET(s, &wfds); | |
} | |
if (s > maxfd) { maxfd = s; } | |
return 0; | |
} | |
int timer_callback(CURLM *multi, /* multi handle */ | |
long timeout_ms, /* see above */ | |
void *userp) /* private callback pointer */ | |
{ | |
if (timeout_ms == -1) { | |
tv.tv_sec = 10; | |
tv.tv_usec = 0; | |
} else { | |
tv.tv_sec = timeout_ms / 1000; | |
tv.tv_usec = (timeout_ms % 1000) * 1000; | |
} | |
return 0; | |
} | |
int main(int argc, char** argv) | |
{ | |
int running = 1; | |
curl_global_init(CURL_GLOBAL_ALL); | |
FD_ZERO(&wfds); | |
FD_ZERO(&rfds); | |
CURLM *multi = curl_multi_init(); | |
curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, socket_callback); | |
curl_multi_setopt(multi, CURLMOPT_TIMERFUNCTION, timer_callback); | |
curl_multi_setopt(multi, CURLMOPT_MAXCONNECTS, 1000); | |
curl_multi_setopt(multi, CURLMOPT_MAX_HOST_CONNECTIONS, 2); | |
curl_multi_setopt(multi, CURLMOPT_MAX_TOTAL_CONNECTIONS, 1000); | |
curl_multi_setopt(multi, CURLMOPT_MAXCONNECTS, 128); | |
curl_multi_setopt(multi, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX); | |
int remaining = 200; | |
while (remaining >= 0) { | |
int i; | |
for (i = 0; i < 4; i++) { | |
remaining--; | |
CURL *easy = curl_easy_init(); | |
curl_easy_setopt(easy, CURLOPT_URL, "https://www.google.com/"); | |
curl_easy_setopt(easy, CURLOPT_VERBOSE, 1); | |
curl_easy_setopt(easy, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE); | |
curl_multi_add_handle(multi, easy); | |
} | |
tv.tv_sec = 0; | |
tv.tv_usec = 0; | |
running = 1; | |
while (running) { | |
if (tv.tv_sec == 0 && tv.tv_usec == 0) { | |
curl_multi_socket_action(multi, CURL_SOCKET_TIMEOUT, 0, &running); | |
} | |
fd_set crfds = rfds; | |
fd_set cwfds = wfds; | |
int count = select(maxfd+1, &crfds, &cwfds, NULL, &tv); | |
if (!count) { | |
curl_multi_socket_action(multi, CURL_SOCKET_TIMEOUT, 0, &running); | |
} | |
for (i = 0; i <= maxfd; i++) { | |
if (FD_ISSET(i, &crfds)) { | |
curl_multi_socket_action(multi, i, CURL_CSELECT_IN, &running); | |
} | |
if (FD_ISSET(i, &cwfds)) { | |
curl_multi_socket_action(multi, i, CURL_CSELECT_OUT, &running); | |
} | |
} | |
while (1) { | |
int msgq; | |
struct CURLMsg *msg = curl_multi_info_read(multi, &msgq); | |
if (msg && (msg->msg == CURLMSG_DONE)) { | |
CURL *easy = msg->easy_handle; | |
curl_multi_remove_handle(multi, easy); | |
curl_easy_cleanup(easy); | |
} | |
if (!msg) { | |
break; | |
} | |
} | |
} | |
} | |
return 0; | |
} |
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