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CURLOPT_C...ETFUNCTION(3) Library Functions Manual CURLOPT_C...ETFUNCTION(3) NAME CURLOPT_CLOSESOCKETFUNCTION - callback to socket close replacement SYNOPSIS #include <curl/curl.h> int closesocket_callback(void *clientp, curl_socket_t item); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETFUNCTION, closesocket_callback); DESCRIPTION Pass a pointer to your callback function, which should match the proto- type shown above. This callback function gets called by libcurl instead of the close(3) or closesocket(3) call when sockets are closed (not for any other file descriptors). This is pretty much the reverse to the CURLOPT_OPENSOCK- ETFUNCTION(3) option. Return 0 to signal success and 1 if there was an error. The clientp pointer is set with CURLOPT_CLOSESOCKETDATA(3). item is the socket libcurl wants to be closed. DEFAULT Use the standard socket close function. 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(); /* call this function to close sockets */ curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket); curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &myown); 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_CLOSESOCKETDATA(3), CURLOPT_OPENSOCKETFUNCTION(3) libcurl 2025-06-03 CURLOPT_C...ETFUNCTION(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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