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.\" generated by cd2nroff 0.1 from CURLOPT_CLOSESOCKETDATA.md
.TH CURLOPT_CLOSESOCKETDATA 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_CLOSESOCKETDATA \- pointer passed to the socket close callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETDATA,
void *pointer);
.fi
.SH DESCRIPTION
Pass a \fIpointer\fP that remains untouched by libcurl and passed as the first
argument in the closesocket callback set with
\fICURLOPT_CLOSESOCKETFUNCTION(3)\fP.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
Added in curl 7.21.7
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_CLOSESOCKETFUNCTION (3),
.BR CURLOPT_OPENSOCKETFUNCTION (3)