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CURLMOPT_SOCKETDATA(3) Library Functions Manual CURLMOPT_SOCKETDATA(3)

NAME

CURLMOPT_SOCKETDATA - custom pointer passed to the socket callback

SYNOPSIS

#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETDATA, void *pointer);

DESCRIPTION

A data pointer to pass to the socket callback set with the CURLMOPT_SOCKETFUNCTION(3) option.

This pointer is not touched by libcurl but is only passed in as the socket callbacks's clientp argument.

DEFAULT

NULL

PROTOCOLS

All

EXAMPLE

struct priv {

void *ours; }; static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp) {
struct priv *p = sockp;
printf("my ptr: %p\n", p->ours);
if(what == CURL_POLL_REMOVE) {
/* remove the socket from our collection */
}
if(what & CURL_POLL_IN) {
/* wait for read on this socket */
}
if(what & CURL_POLL_OUT) {
/* wait for write on this socket */
}
return 0; } int main(void) {
struct priv setup;
CURLM *multi = curl_multi_init();
/* ... use socket callback and custom pointer */
curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup); }

AVAILABILITY

Added in 7.15.4

RETURN VALUE

Returns CURLM_OK.

SEE ALSO

CURLMOPT_SOCKETFUNCTION(3), CURLMOPT_TIMERFUNCTION(3), curl_multi_socket_action(3)

February 19 2024 libcurl