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CURLOPT_CLOSESOCKETDATA(3) Library Functions Manual CURLOPT_CLOSESOCKETDATA(3) NAME CURLOPT_CLOSESOCKETDATA - pointer passed to the socket close callback SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETDATA, void *pointer); DESCRIPTION Pass a pointer that remains untouched by libcurl and passed as the first argument in the closesocket callback set with CURLOPT_CLOSESOCKETFUNC- TION(3). Note that when using multi/share handles, your callback may get invoked even after the easy handle has been cleaned up. The callback and data is inherited by a new connection and that connection may live longer than the transfer itself in the multi/share handle's connection cache. DEFAULT NULL PROTOCOLS This functionality affects all supported protocols EXAMPLE struct priv { void *custom; }; static int closesocket(void *clientp, curl_socket_t item) { struct priv *my = clientp; printf("our ptr: %p\n", my->custom); printf("libcurl wants to close %d now\n", (int)item); return 0; } int main(void) { struct priv myown; CURL *curl = curl_easy_init(); if(curl) { CURLcode result; /* call this function to close sockets */ curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket); curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &myown); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.21.7 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_CLOSESOCKETFUNCTION(3), CURLOPT_OPENSOCKETFUNCTION(3) libcurl 2026-06-11 CURLOPT_CLOSESOCKETDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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